Snubbing Case Histories

Snubbing Case History #1

Objective: Completion of multi-zone sweet gas well

Well Information: 31 Mpa sweet multi–zone gas well. Workover Rig pulled fracturing string (114mm Hydril) took kick with 100m in hole. Depth: 2,900m

Procedure: Strip on riser spool to bring connection above substructure. Strip on snubbing unit. Snub out 10 joints and BHA. RIH scraper and condition perforations. Rig in e-line and run gauge ring through perforations. RIH: TEP, BHA of profiles and spacing pups, 19joints 73mm tubing. Hang off pipe in rams, rig up e-line, and lubricate in packer assembly. RIH with 89mm tubing to bottom. Rig up e-line and log on depth. Space out BHA set packer; come off, set test packer, and pressure test permanent packer. Rig up wireline, set plug at bottom, and POOH with 89mm work string. RIH with seal assembly, blast joints profiles and spacing pups, frac packer, and 114mm tubing. Pull plug, sting into packer and pressure test. Pull out of packer reset plug, space out, latch into permanent, set packer, and land tubing. Pull plug pressure test seals and packer. Rig out snubbing unit. Stand-by for Fracture stimulation. Rig up riser spools and snubbing unit and pressure test. Release frac packer strip out tubing hanger, and POOH 114mm string and BHA. Rig up e-line to set bridge plug and perforate. RIH: frac packer BHA and 114mm tubing. Strip in tubing hanger, set packer, land tubing, pressure test packer, rig out snubbing unit and stand-by for fracture. Rig up riser spools and snubbing unit, pressure test and POOH with frac string. Change over to 73mm handling equipment and RIH with bridge plug retrieving skirt. Tag sand, pull plug, clean off sand, and latch onto bridge plug and release. Run plugs on wireline and POOH. Strip in completion BHA and RIH to bottom, space out tubing, latch into permanent packer, set upper packers, and land tubing. Pull plug, pressure test seals, and rig out snubbing unit and release.

Time on location: 18 days working 24s over a 32 day period

Snubbing Case History

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Snubbing Case History #2

Objective: Remove frac string and install completion system.

Well Information: 11 Mpa sour gas well was fractured through 89mm tubing. Depth: 1,800m

Procedure: Rig up snubbing unit, and pressure test. Release packer, strip out tubing hanger and POOH with frac string. With one joint left, land tubing hanger and install enough riser spool to accept the BHA. Snub out tubing hanger, 1 joint, and BHA. Remove riser spool and change over handling equipment to 73mm. Strip in BHA, and 73mm tubing. Strip in tubing hanger, set packer, land tubing and rig out.

Time on location: 19 hours over 2 days

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Snubbing Case History #3

Objective: Remove 114mm frac string and install 73mm completion system.

Well Information: 28 Mpa sweet gas well, depth: 3,400m.

Procedure: Rig up required riser spool and snubbing unit, and pressure test. Release frac packer, strip out tubing hanger and POOH and lay down114mm tubing and BHA. Change over handling equipment to 73mm. Strip in BHA, and RIH 73mm tubing. Space out BHA, strip in tubing hanger, latch into permanent packer, set top packer, and land tubing. Pull plugs and pressure test seals. Rig out snubbing unit.

Time on location: 73 hours over 4 days

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Snubbing Case History #4

Objective: Abandon lower zone and complete upper zones.

Well Information: 8,500 Kpa sweet gas well, no longer interest in lower zone. Completion required on upper zones. Depth: 1,450m

Procedure: Rig up snubbing unit and pressure test. Come off on/off tool, strip out tubing hanger, and POOH tubing and strip out BHA. Strip in packer and BHA, RIH tubing to below top perforations. Set packer pull plug and pressure test lower packer. Re-run plug, POOH tubing, and strip out BHA. Rig up wireline, bail cement onto packer, re-perforate upper zone, set packer bleed off casing, dump bail sand onto packer, and perforate upper zone. RIH on/off skirt, BHA, and tubing. Tag sand, pull plug and flow out sand. Come off packer, set plug, space out tubing, strip in tubing hanger, latch onto packer, and land tubing. Pull plug pressure test on/off tool and rig out snubbing unit.

Time on location: 54 hour over 6 days

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Snubbing Case History #5

Objective: Remove production tubing to Fracture top zone. Retrieve bridge plug and re-run production tubing.

Well Information: 15 Mpa sweet gas well. Depth: 2,200m

Procedure: Rig up snubbing unit and pressure test. Come off packer and strip out tubing hanger, tubing and BHA. Rig out snubbing unit for frac. After frac, RIH retrieving tool, BHA and tubing to top of sand. Install slim hole safety valve and pull plugs. Clean down 160m onto bridge plug using slim hole safety valves, and release. Run plugs and POOH same. RIH completion BHA and tubing, latch onto packer and land tubing. Pull plugs and pressure test on/off tool. Rig out snubbing unit.

Time on location: 88 hours over 8 days

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Snubbing Case History #6

Objective: Replace 73mm tubing with 60.3mm tubing for better fluid lift, company acquired permission to co-mingle zones, so packer will be removed.

Well Information:
5,500 Kpa gas well, 1,600m deep.

Procedure: Rig up snubbing unit and pressure test. Try to unset packer but cannot. Free point and cut tubing. Set bridge plug and POOH. RIH overshot, wash over pipe floats bumper sub and jars. Latch onto fish and work free. POOH fishing string and fish. Change over handling equipment to 60.3mm. RIH slick string.

Time on location: 55hours over 8 days

Rigged up

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Snubbing Case History #7

Objective: Run in the hole simple completion string.

Well Information: 4,000 Kpa sweet gas well, 1,400m deep.

Procedure: Rig up snubbing unit and pressure test. RIH Snubco Tubing End Plug, BHA and 1,400m tubing, strip in tubing hanger and land tubing. Rig out snubbing unit.

Time on location: 6 hours

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Snubbing Case History #8

Objective: Run simple completion string.

Well Information: 3,000 Kpa sweet gas well, 580m deep.

Procedure: Rig up snubbing unit and pressure test. RIH Snubco tubing end plug, 1 joint, profile, 1.24m pup, and 60 joints. Strip in tubing hanger, land tubing rig out snubbing unit.

Time on location: 3.5 hours

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Snubbing Case History #9

Objective: Install completion packer and tubing in dual zone gas well.

Well Information: 4,000 Kpa sweet gas well, two producing zones with no authority to co-mingle. Depth: 650m.

Procedure: Rig up snubbing unit and pressure test. RIH Re-entry guide, .6m pup, profile, 3m pup, packer with on/off, 11 joints, blast joints, port sub, pup, and 59 joints. Strip in tubing hanger, set packer, land tubing. Rig out snubbing unit.

Time on location: 4 hours

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Snubbing Case History #10

Objective: Retrieve bridge plug and install production tubing.

Well Information: 5,500 Kpa sweet gas well, 800m deep.

Procedure: Rig up snubbing unit and pressure test. RIH retrieving skirt, pup profile with plug in place, pup and 79 joints. Latch onto bridge plug and release. POOH same. RIH tubing end plug, 1 joint, profile, pup, and 76 joints. Strip in tubing hanger and land tubing. Rig out snubbing unit.

Time on location:
7 hours

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Snubbing Case History #11

Objective: Change production tubing and BHA to 60.3mm

Well Information: 18.5 Mpa sweet gas well, 3,100m deep

Procedure: Rig up snubbing unit and pressure test. Strip out tubing hanger and POOH, swabbing tubing as required. With 1 joint left, land tubing hanger and install 2.5m riser spool and strip out BHA. Change over handling equipment to 60.3mm and pressure test. Snub in packer assembly and 3,100m 60.3mm tubing. Strip in tubing hanger, set packer and land tubing. Rig out snubbing unit.

Time on location: 28 hours over 4 days.

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Snubbing Case History #12

Objective: Remove tubing and packer assembly from well.

Well Information: 22 Mpa sweet gas well, 3,230m deep.

Procedure: Rig up snubbing unit and pressure test. Strip out tubing hanger and POOH, swabbing tubing as necessary. Land BHA in rams, rig wireline and lubricate out BHA. Lay down BHA and rig out wireline and snubbing unit.

Time on location: 32 hours over 4 days.

Snubbing  Case History 12

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Snubbing Case History #13

Objective: Snub in 33.4mm siphon string.

Well Information: 6 Mpa sour gas well, 2,050m deep.

Procedure:
Rig up 179mm to 281mm cross over flange and offset DSA. Rig up snubbing unit and pressure test. Snub in mule-shoe w/ tubing end plug, pup, “Q” nipple, pup, and 209 joints 3.4mm tubing through primary tubing hanger. Strip in secondary tubing hanger and land tubing. Rig out snubbing unit and spools.

Time on location: 10 hours

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Snubbing Case History #14

Objective: Snub out drill string and run completion string.

Well Information: 7,200 Kpa sour gas well (725ppm), 1,400m deep.

Procedure: Rig up snubbing unit and pressure test. Strip out tubing hanger, and POOH and stand tubing in derrick. Change over to handle drill collars and pull and lay down drill collars and BHA. Change over to 60.3mm handling equipment and snub in BHA and 1,400m tubing. Rig out snubbing unit.

Time on location:
8 hours

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Snubbing Case History #15

Objective: RIH simple completion string.

Well Information: 11 Mpa sweet gas well, 2,700m deep.

Procedure: Rig up Snubbing unit and pressure test. RIH tubing end plug, pup, profile, pup, and 286 joints tubing. Strip in tubing hanger, land tubing and rig out snubbing unit.

Time on location: 10 hours

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Snubbing Case History #16

Objective: Fish dropped coil tubing and run production tubing.

Well Information: 12 Mpa sour (1500ppm) gas well, 1,700m. During coil operations, well control was lost and shear rams on coil unit were closed and coil was dropped. Well was subsequently secured with a bridge plug above the lost coil.

Procedure: Rig up and pressure test snubbing equipment. RIH with retrieving tool, pup, profile with plug, pup, and 2 joints tubing. Pressure up above plug with N2, latch onto plug and release. Snub out same. RIH fishing tools and latch onto coil. POOH fishing string, strip out over shot, and hang coil in slip rams. Remove snubbing unit jack plate and slips, rig up riser spool adequate to extend above snubbing unit work floor, and rig up coil BOPs and injector. Connect coil fish to coil in injector, and retrieve lost coil. Close blind rams bleed of system and rig out coil equipment. Install slips and jack plate, change over to 60.3 handling equipment. Strip in BHA and 173 joints. Strip in tubing hanger, set packer and land tubing. Rig out snubbing unit.

Time on location: 61 hours over 7 days

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Snubbing Case History #17

Objective: Install dual string completion.

Well Information: Low pressure (4,500kPa) shallow gas well (550m). With 2 zones not co-mingled, Customer needs tubing for fluid lift on upper zone.

Procedure: Install stripping rams dressed with offset rams orientated to long string side on tubing spool. Rig up workover rig BOP stack. Pressure test casing, swab dry and perforate required zones. Rig up snubbing unit and pressure test. Strip in long string BHA with appropriate tail pipe, packer and blast joints. RIH tubing strip in primary tubing hanger with 1.2m pup above. Set packer, orientate hanger and land long string. Close lower offset rams on 1.2m pup, bleed off above and remove landing joint. Secure well with blind rams and change upper offset rams to short string side. Make up short string BHA and locate into secondary hanger receiver in primary hanger. RIH short string tubing, strip in secondary hanger, land tubing and pressure test hanger assemblies. Rig out snubbing unit and BOPs, install top section, pull plugs and prove segregation.

Time on location: 9.5 hours

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Snubbing Case History #18

Objective: Install dual zone completion.

Well Information: 3,500 Kpa gas well, 450m, two zones

Procedure: Pick up snubbing unit, place on rig BOPs, split stack above rams, install spool to house packer, and pressure test. RIH re-entry guide, pup, profile with plug in place, pup, and 4 joints. Strip in packer, pup, blast joints, pup, port sub, pup, and 43 joints. Strip in tubing hanger, set packer, land tubing and rig out snubbing unit and spools.

Time on location: 6 hours

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Snubbing Case History #19

Objective: Utilize Snubco low pressure unit to install production tubing.

Well Information: 1,300 Kpa gas well, 300m.

Procedure: Rig up unit and pressure test. RIH tubing end plug, 1joint, profile, 1.2m pup, 29 joints, install tubing hanger in work window, land tubing and rig out.

Time on location: 3 hours

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Snubbing Case History #20

Objective: Install dual string completion.

Well Information: 9 Mpa 1,500m gas well, 2 zones. Lower zone already perforated and producing.

Procedure: Rig up snubbing unit and pressure test. Strip out tubing hanger and POOH tubing. Strip in BHA with packer and RIH to place packer above perforations. Come off packer, pull 1 joint, land tubing and pressure test packer, and rig out snubbing unit. Install striping rams offset to long string side above tubing spool. After top zone is perforated and stimulated, rig up snubbing unit and pressure test. Strip out center bore tubing hanger, RIH to tag fill on packer. Strip in primary tubing hanger, pull plug and clean off on/off tool. Latch onto packer, orientate and land tubing hanger. Close offset rams on 1.2m pup above hanger. RIH short string and land. Pressure tubing hanger, rig out snubbing unit and BOPs.

Time on location: 27.5 hours

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Snubbing Case History #21

Objective: Change out 73mm tubing to 60.3mm for better fluid lift.

Well Information: 9 Mpa gas well, 2360m deep. Packer fluid in annulus.

Procedure: Rig up snubbing unit and pressure test. Come off packer, pull out tubing hanger, and roll well over to N2, latch onto packer and release. POOH tubing and BHA. Change over handling equipment to 60.3mm. Strip in BHA and tubing. Land tubing and rig out snubbing unit.

Time on location: 28 hours over 3 days

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Snubbing Case History #22

Objective: Convert dual completion to dual string completion with 33.4mm siphon string

Well Information: 4,000 Kpa gas well, 600m waters its self out.

Procedure: Set plug in tubing and remove top section. Install full bore dual string tubing spool. Install stripping rams offset to long string side, service rig BOPs, and snubbing unit. Pressure test. Come off packer, strip out tubing hanger and strip in .3m nipple, primary dual string tubing hanger and 1.2m pup. Latch onto packer, orientate hanger and land tubing. Close offset rams on 1.2m pup, bleed off stack and remove landing joint. Secure well with blind rams. Change over handling equipment to 33.4mm, lay down snubbing unit and install offset flange assembly. Pressure test. RIH 550m siphon string and land. Pressure test hangers. Rig out snubbing and BOP equipment.

Time on location: 16.5 hours

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Snubbing Case History #23

Objective: Retrieve 7 bridge plugs and run completion string.

Well Information: Sweet well with 7 zones ranging from 14 Mpa to 31Mpa between 2,600m and 3,000m. All zones have been fractured with a bridge plug set above the perforations before the next zone is perforated and fractured. A permanent packer is set above the lowest perforations. When snubbing unit arrived the tubing was landed above the upper set of perforations.

Procedure: Rig up snubbing unit and pressure test. Pull tubing hanger and run down to sand. Pull tubing plugs circulate clean and release bridge plug. Strip out slim hole valves, rig up wireline and set plugs. POOH with tubing and bridge plug. RIH with retrieving skirt and tubing and repeat sequence 6 times to retrieve all bridge plugs. Make up and strip in BHA to allow for segregation of all zones. RIH tubing, latch onto packer, come off and space out tubing. Strip in tubing hanger latch onto packer, set hydraulic set packers and land tubing. Rig out snubbing unit.

Time on location: 96.5 hours over 9 days

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Snubbing Case History #24

Objective: Remove completion tubing

Well Information: 8 Mpa gas well, 2,200m deep, .4% H2S

Procedure: Rig up snubbing unit and pressure test. Strip out tubing hanger, 2,200m tubing, and BHA.

Time on location: 4.5 hours

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Snubbing Case History #25

Objective: Retrieve bridge plug and install completion tubing.

Well Information: 13 Mpa sweet gas well, 2,350m deep

Procedure: Rig up snubbing unit and pressure test. Strip out tubing hanger and run in 3 joints to tag sand. Pull wireline plug and wash clean onto bridge plug and release. Set wireline plug and POOH tubing and BHA. RIH re-entry guide, pup, profile with plug in place, pup, and tubing. Tag fill. Pull wireline plug and clean out cellar. Set plug and pull 4 joints, strip in tubing hanger and land tubing. Rig out snubbing unit.

Time on location: 22.5 hours

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Snubbing Case History #26

Objective: Perform acid selective stimulation and completion.

Well Information: 8 Mpa gas well, 2,400m deep.

Procedure: Rig up snubbing unit and pressure test. Strip in acid tools and 225 joints tubing, space out tubing and correlate to logs. Rig up slick line and pull plugs. Perform acid job, close valve, pull 1 joint and land tubing. Rig out snubbing unit. Rig performs tasks. Rig up snubbing unit and pressure test. Strip out tubing hanger, tubing and acid tools. RIH completion BHA and tubing, tag fill, rig up wireline and pull plug. Clean out to packer, pull slim hole valves set plug space out tubing strip in tubing hanger, latch onto packer and land tubing.

Time on location: 29.5 hours

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Snubbing Case History #27

Objective: Gain control of well, replace tubing spool. RIH completion string.

Well Information: Workover rig took kick, no tubing hanger in place.

Procedure: Strip on snubbing unit and pressure test. Strip out safety valve, 2,620m and BHA. RIH on/off tool, BHA and 2,500m tubing, pressure test tubing strip in packer and 2 joints. Set packer and pressure test. Come off packer lay down 2 joints rig out snubbing unit and Bops to inspect tubing spool. Replace tubing spool. Rig up Bops and snubbing unit and pressure test. Run in latch onto packer, pressure up above and release. Strip out 2 joints and packer. Run to bottom, space out tubing, strip in tubing hanger, latch onto packer, and land tubing. Rig out snubbing unit.

Time on location: 35 hours over 4 days

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Snubbing Case History #28

Objective: Drill out surface plug.

Well Information: Re-entry is required into abandoned well.

Procedure: Rig up snubbing unit and pressure test. Run in hole: bit, bit sub c/w floats, mud motor, and drill string to 20m drill through plug, run into 140m, and drill down 500m. Break through. Run in 700m circulate dead. Land tubing and rig out snubbing unit.

Time on location: 17 hours

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Snubbing Case History #29

Objective: To mill out sulfur plugs out of 88.9 production tubing

Well Information: 21% sour gas well, 3,800m deep, 47MPa. Solid sulfur precipitated out during production resulted in the tubing being plugged at about 1,700m.

Procedure: A self-contained snubbing unit was used on this well. 1.66 tubing was the drill string. Fill hole with water. Rig up 4-1/16 10K primary BOPs and stripping BOPs. RIH with mill, bit sub, double float assembly, “Q” profile nipple, drill collars, Profile nipple, and drill pipe to plug. Establish circulation and dill through sulfur bridge. Circulate to bottom to ensure well tubing is clear to bottom. POOH and rig out.

Time on Location: 10 days

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Snubbing Case History #30

Objective: Recover lost perforating gun and wire, install completion assembly.

Well Information: 8.6 Mpa gas well, 1,300m deep. Packer set segregating lower zone with 2m sand on it. Perforated upper zone, lost gun and 600m wire. Workover rig blind rams closed on wire and leaking.

Procedure: Rig up shear rams and snubbing unit. Run in wire spear to below tubing spool and rotate onto wire. Pull up, close shear rams and lay down recovered wire. Run spear down 1 joint and rotate onto wire. Pull up close shear rams and lay down recovered wire. Snub in tubing hanger, land, replace blind rams and pressure test. Snub out tubing hanger. Strip in wire spear, BHA and 600m tubing rotating onto wire. POOH, land fishing assembly in rams, rig up 15m lubricator and lubricate out fishing BHA. Lay down BHA and recovered wire. RIH wash over pipe and grapple assembly. Tag fish, rotate over and run to bottom. POOH fishing string and land in rams. Rig up wireline and lubricate out. RIH on/off tool and completion BHA, tag bottom, pick up to next tool joint and rig up wireline and pull plug. Clean out to packer, come off and pick up to first connection. Set plug, space out tubing, strip in tubing hanger, latch onto packer, and land tubing. Rig out snubbing unit and rams.

Time on location: 36.5 hours over 4 days

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Snubbing Case History #31

Objective: Install packer between two zones.

Well Information: 4,000 Kpa gas well, 550m deep, 3 zones, and required segregation between upper zones.

Procedure: Rig up snubbing unit and pressure test. Un-seat seal assembly, strip out tubing hanger, tubing and BHA. Make up seal assembly BHA, 12 joints, packer c/w on/off, pup, port sub, blast joints, pups, and 40 joints. Locate seals, come out, space out tubing, and strip in tubing hanger, land seals, set packer and land tubing.

Time on location:
6.5 hours.

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Snubbing Case History #32

Objective: Fish lost perforating gun and run production tubing.

Well Information: 3,500 Kpa gas well, 500m deep. Perforating gun stuck in tubing spool.

Procedure: Rig up and pressure test spools and snubbing unit. Run fishing tools latch onto fish and POOH. Lay down recovered fish. Strip in on/off skirt, BHA and 500m tubing. Latch onto packer, come off and space out tubing, strip in tubing hanger latch onto packer, land tubing and rig out.

Time on location: 7.5 hours

Snubbing Case History 32 - Spooling

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Snubbing Case History #33

Objective: Pull production tubing, perforate new zone and re-install w/ packer.

Well Information: 6 Mpa gas well, 900m deep.

Procedure: Rig up snubbing unit and pressure test. Strip out tubing hanger and tubing. Rig out snubbing unit to perforate. Rig up snubbing unit and pressure test. Strip in BHA and 900m tubing, strip in tubing hanger, set packer, land tubing and rig out snubbing unit.

Time on location:
15 hours.

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Snubbing Case History #34

Objective: POOH with production tubing, clean out fill, install production tubing.

Well Information: 6,000 Kpa, 1,400m deep

Procedure: Rig up snubbing unit and pressure test. Strip out tubing hanger, tubing and BHA. RIH bit float sub, tubing to bottom. Rig up power swivel and clean out to TD. POOH same. RIH BHA and production tubing. Rig out snubbing unit.

Time on location:
13 hours.

Power Swivel

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Snubbing Case History #35

Objective: POOH frac string and install production system.

Well Information: 25 Mpa gas well, 2880m deep.

Procedure: Rig up snubbing unit and pressure test. Unset Packer, run in 2 joints and latch onto bridge plug and release. POOH and lay down frac string and BHA. RIH with retrieving tool and tubing, latch onto bridge plug and release. POOH with same. RIH with BHA and production tubing, tag fill. Pull wireline plug, clean out utilizing slim hole valves to TD. Pull 4 joints. Set plug, space out tubing, strip in tubing hanger, land tubing, and rig out snubbing unit.

Time on location: 55 hours over 5 days

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Snubbing Case History #36

Objective: Move tubing up hole 300m

Well Information:
9 Mpa, 1.5% H2S gas well.

Procedure:
Rig up snubbing unit and pressure test. Strip out tubing hanger, and 30 joints tubing. Strip in tubing hanger, set packer land tubing and rig out snubbing unit.

Time on location:
7 hours

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Snubbing Case History #37

Objective: Drill into productive zone, install completion

Well Information: 4,500 Kpa gas well 700m deep

Procedure: Rig up snubbing unit and pressure test. POOH production tubing. RIH bit, motor, floats, and tubing to bottom. Drill down to required depth. POOH same. RIH production tubing. Rig out snubbing unit.

Time on location: 19.3 hours

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Snubbing Case History #38

Objective: Complete gas well

Well Information: 14Mpa sweet gas, 2,600m deep.

Procedure: Rig up snubbing unit and pressure test. Strip in BHA and 269 joints tubing. Strip in tubing hanger, land tubing and rig out.

Time on location: 9.5 hours

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Snubbing Case History #39

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<p/sstrongtrong/strong>Objective:Change out BHA.

Well Information: 16Mpa gas well, 2,900m deep.

Procedure: Rig up and pressure test snubbing unit. Release packer, strip out tubing hanger, and POOH tubing and BHA. Strip in new BHA and production tubing. Strip in tubing hanger set packer and land tubing. Rig out snubbing unit.

Time on location: 20.5 hours.

S18 Truck

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Snubbing Case History #40

Objective: POOH frac string and run production system.

Well Information: 12mPa gas well, 2600m deep. No tubing hanger landed, strip on snubbing unit.

Procedure: Strip on riser spool and snubbing unit. Strip out safety valve and strip in tubing hanger. Pressure test. Strip out tubing hanger. Strip out and lay down frac string, and BHA. Strip in production BHA, pick up and snub in production tubing. Strip in tubing hanger, set packer and land tubing. Rig out snubbing unit.

Time on location: 32.5 hours over 3 days

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Snubbing Case History #41

Objective: Recover sanded in 60.3mm completion string

Well information: 9mPa sweet well 2300 meters deep.

Procedure:
A 60.3mm tubing string had become stuck in sand. Coil tubing was brought in the clean out sand but operation was unsuccessful. A service rig and E-line was rigged up to free point and cut the tubing with a chemical cutter. Tubing cut was made and permanent tubing bridge plug was set. Rig assist unit was rigged in and tubing string was then snubbed out. Wash over pipe was snubbed in and fish was retrieved. New 60.3mm tubing completion string was then snubbed in and landed at required depth.

Time on location: 3 days.

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Snubbing Case History #42

Objective: Rig up Snubbing unit. Drill out surface plug.

Well Information: Surface plug set in 114.3mm casing at surface. Unknown pressure below.

Procedure: Rig up Snubbing unit. Pressure test flanges. Lower BHA (Bit, motor, float sub) plus one joint plus tubing into stack. (Tubing swivel head installed above) Tag plug, start circulating fluid. Wait for returns at tank. Start drilling surface plug using traveling slips to hold tubing. Once through plug, pick up one joint and circulate down. Circulate until clean. Remove swivel head. Install tubing hanger and land string in casing bowl. Rig out snubbing unit.

Time on location: 7 hours

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Snubbing Case History #43

Objective: Remove drill string. Install multi-zone production string.

Well Information: 18 mPa sweet well, Multiple zones. Depth: 3400

Procedure: Strip on snubbing unit. Install tubing hanger. Land string and pressure test. Pull hanger, 350 joints 60.3mm plus BHA. (Bit, motor, dual float subs) Snub in multiple blast joints and sliding sleeves (configured accordingly) with a packer. Set packer, bleed off annulus for a negative pressure test. Come off packer, fill with fluid and do a positive pressure test. Pull 24 joints, install tubing hanger. Land string and rig off snubbing unit. Zones above packer perforated, fractured, and bridge plugs drilled. Rig up snubbing unit. Run in On/Off skirt plus multiple blast joints with sliding sleeve. Tag sand above packer. Wireline out tubing plugs. Clean out sand. Wireline in tubing plugs. Space out, install tubing hanger. Latch onto packer and land string. Rig out snubbing unit.

Time on location: 83 hours over 7 days.

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Snubbing Case History #44

Objective: Remove packer from completion BHA.

Well Information: 6 Mpa gas well. Depth: 1,300m.

Procedure: Rig up snubbing unit and pressure test. Strip out tubing hanger, 1,300m tubing and BHA with packer. RIH re-entry guide, pup, flow sub, pup, “X” profile c/w plug in place, pup, and 130 joints of tubing. Strip in tubing hanger and land tubing.

Time on location:
10.5 hours

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Snubbing Case History #45

Objective: To fish out coiled tubing lost in 88.9mm production tubing.

Well Information: 19% sour gas well, 4,600m (14,720”) deep, 60.7MPa (8,800psi). Coiled tubing was performing a cleanout and chemical spot operation. The tubing became stuck and was subsequently parted leaving about 2,700m of tubing in the well.

Procedure: Used workover rig and rig assist snubbing unit. Rigged up 4-1/16, 10K slip rams for coil and shear rams on top of master valve. Rigged up 4-1/16, 10K Primary BOP stack. Rigged up 4-1/16, 10K stripping stack on top of primary stack. Fill the hole with appropriate kill fluid and use lubricate and bleed kill method to reduce the tubing pressure. RIH with 1.66 tuning and fishing assembly. Circulate kill fluid as necessary. Latch on to fish and pull to recover a portion of the lost coil. Bring to surface and close slip rams on fish, shear coil, move fish up to clear blind rams to recover section of coil and repeat until the entire section was recovered. Repeat fishing process until all that is practical is recovered. RIH with mill to remove bent up remaining coil and clean off fish. RIH with fishing tools to recover coiled tubing tools.

Time on Location: 44 days

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Snubbing Case History #46

Objective: Install production string.

Well Information: 9 mPa sweet gas well, single zone. Depth: 1750m

Procedure: Rig up snubbing unit, and pressure test. Snub in “slick string”. Install tubing hanger. Land string. Rig out snubbing unit.

Time on location: 11 hours

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Snubbing Case History #47

Objective: Snub in BHA consisting of packer, blast joints, pup joints and sliding sleeves, upper dual string packer and 2 strings of 60.3mm tubing.

Well Information: 14mPa, sour 2000 meter gas well.

Procedure: Pre job meeting was held and snubbing stack was designed and built using offset equipment, spacer spools and hanger flange for this job. Lower packer was snubbed in with assorted blast joints, sliding sleeves, tubing blanking plugs and required amount of tubing for spacing. At this point tubing was still pipe light. Tubing was secured in well using lower stripping rams and hanger flange. At this point the snubbing unit was rigged down and upper dual string packer installed in tubing string and spacer spool to cover packer was added to stack. Snubbing jack was rigged back up and pressure texted. Tubing string was then snubbed down to required depth and packer were spaced out and set. Snubbing unit was then rigged out and extra spacer spools were rigged out and offset spools were rigged in. Snubbing unit was once again rigged up and pressure tested. Short string of completion was then snubbed in and dual string packer was latched and short string tubing mandrel was landed. Snubbing unit was then rigged out.

Time on location: 18 hours

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Snubbing Case History #48

Objective: Utilize rig assist snubbing unit to drill out multiple bridge plugs on high pressure gas wells

Well Information: Surface pressures up to 60mPa.

Procedure: Pre job meeting was held and job parameters were discussed with customer. Tubing string with drilling BHA were run into dead well. BOP configuration was discussed and designed around well parameters. Rig assist snubbing unit was rigged up utilizing a 70mPa stripping stack. Multi bridge plugs drilled out, tubing raised to required depth, tubing hanger landed and snubbing unit rigged out and drilling BHA separated from production string and dropped into cellar.

Time on location: 3 days – 1 partial day to rig up, 1 day to drill out and 1 partial day to rig out.

S19

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Snubbing Case History #49

Objective: Snub out and replace 228mm packer utilizing a 177mm snubbing stack.

Well Information: 5mPa 670 meter horizontal water injection well with 228mm casing and 88.9mm coated tubing.

Procedure: Rig in 279mm primary BOP, 279mm spacer spool, 270mm single gate pipe ram, 279mm to 177mm x/o spool and 177mm snubbing unit. Snub in with retrieving tool BHA and latch onto 228mm packer. Unset packer and snub to surface. Hang off BHA utilizing upper 279mm single gate. Rig out 177mm equipment and rig in electric line with 279mm lubricator. Lubricate 228mm packer up and close blind rams. Make up new 228mm BHA and lubricate back into well hanging off with upper 279mm single gate. Rig in 177mm snubbing unit and pressure test, snub BHA into well and space out. Close primary annular and bleed off snubbing stack. Unbolt snubbing unit and walk snubbing jack up and install heavy slips below connection. Set string into heavy slips, secure snubbing unit and spin out joint and install tubing hanger. Secure snubbing unit on tubing string again and pick up out of heavy slips. Remove heavy slips and walk snubbing unit down and bolt back onto BOP stack. Pressure test, set packer and land tubing hanger. Rig out snubbing unit.

Time on location: 16 hours over 2 days

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Snubbing Case History #50

Objective: Service rig took a kick when pulling 88.9mm frac string, pipe was only part way out of the hole and no tubing hanger was landed.

Well information: 25mPa, 3700 meter gas well.

Procedure: Strip on rig assist snubbing jack and pressure test. Snub out remaining 2500 meters of 88.9mm frac string and BHA. Change over handling equipment to 60.3mm. Snub in retrieving tool, TKX plug and 60.3mm tubing and tag sand at 3400 meters. Rig in nitrogen pumper and circulate sand out and latch onto packer. Snub out 60.3mm tubing and packer. Snub in 60.3mm slick string. Rig out snubbing unit.

Time on location:
6 days

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Snubbing Case History #51

Objective: Retrieve stuck perforating guns

Well information:
21mPa, 2800 meter gas well

Procedure: Rig up snubbing unit and pressure test. Make and fishing string consisting of wash over pipe, floats, bumper sub, hydraulic jars and 73mm tubing. Snub in the hole and latch onto fish. Jar fish free and snub out of hole until BHA is at surface. Hang off in snubbing rams. Rig in wireline and lubricate BHA out of hole. Rig out wireline and snubbing jack.

Time on location: 3 days

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Snubbing Case History #52

Objective: Retrieve multiple WR bridge plugs and snub in production

Well information: 3000 meter, 24mPa multi zone gas well

Procedure: Rig up snubbing unit. Make up retrieving tool BHA and snub into hole until sand top is tagged. Rig in wireline and pull slip stop and plug. Use formation gas to perform a 50 meter sand clean out using slim hole valves. Latch onto WR and rig in wireline to set plug and slip stop. Snub out of hole. Repeat process for the next 4 WR plugs. Make up production BHA consisting of 4 hydraulic set packers, multiple sets of blast joints, 4 sliding sleeves and pups, and tubing to surface. Snub in requirement amount of tubing and rig in wireline to log tubing into place. Space out tubing and land tubing hanger. Set packers and rig out snubbing unit.

Time on location: 14 days

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Snubbing Case History #53

Objective: Sweet well completion/ multiple wells.

Well information: 1700m, 6 mPa. Self contained equipment.

Procedure: Rig up self contained equipment on top of gate valve, pressure test primary BOP’s and snubbing stack. Snub in packer assembly, blast joints, and tubing to surface. Land tubing, and set packer, rig out equipment, ready unit for travel, and convoy to next location. Rig up equipment, pressure test, and secure well for night. Tally tubing for following day.

Length of time worked, including travel: approximately 10 hours.

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Snubbing Case History #54

Objective: Snub in seal assembly, 2 hydraulic set packers, 3 sliding sleeves, blast joints and 73mm tubing.

Well information: 18mPa, 3400 meter multi zone gas well

Procedure: Rig in rig assist snubbing unit according to customer and IRP 15 egress requirements. Snub in the hole with seal assembly, packers, sliding sleeves, blast joints and tubing to surface. Tubing was inspected and pressure test on the way in the hole. Threads also were inspected and perfect torque used to make connections. Space out, sting into permanent packer and set hydraulic packers. Rig out snubbing unit.

Time on location: 36 hours over 3 days

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Snubbing Case History #55

Objective: Retrieve stuck perforating guns

Well information: 21mPa, 2800 meter gas well

Procedure: Rig up snubbing unit and pressure test. Make and fishing string consisting of wash over pipe, floats, bumper sub, hydraulic jars and 73mm tubing. Snub in the hole and latch onto fish. Jar fish free and snub out of hole until BHA is at surface. Hang off in snubbing rams. Rig in wireline and lubricate BHA out of hole. Rig out wireline and snubbing jack.

Time on location: 3 days

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Snubbing Case History #56

Objective: Retrieve multiple WR bridge plugs and snub in production

Well Information: 3000 meter, 24mPa multi zone gas well

Procedure: Rig up snubbing unit. Make up retrieving tool BHA and snub into hole until sand top is tagged. Rig in wireline and pull slip stop and plug. Use formation gas to perform a 50 meter sand clean out using slim hole valves. Latch onto WR and rig in wireline to set plug and slip stop. Snub out of hole. Repeat process for the next 4 WR plugs. Make up production BHA consisting of 4 hydraulic set packers, multiple sets of blast joints, 4 sliding sleeves and pups, and tubing to surface. Snub in requirement amount of tubing and rig in wireline to log tubing into place. Space out tubing and land tubing hanger. Set packers and rig out snubbing unit.

Time on location: 14 days

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Snubbing Case History #57

Objective: clean out sand latch on to packer
Well Information: 2200 m , 12Mpa , Multi-zone gas well

Procedure: Rig up snubbing stack stage out tubing hanger add 1 joint, rig in cleanout kit . Lower joint to sand top, pick up tubing string, flow tubing through cleanout swivel watch returns start lowering tubing string monitor string weight. Clean out casing to joint top, pick up tubing string flow tubing for 10 min shut in tubing side, rig in second tubing joint equalize joint and cleanout assembly, open tubing and continue cleanout monitor tubing string weight, touch packer top clean packer top for 30 min. Shut in tubing latch on to packer bleed off tubing negative test on/off seal assembly, equalize tubing come off packer, rig out cleanout kit latch back on to packer, release packer pull out of hole, stage out packer. Run back in hole with final production string.

Time on location: 3 days

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Snubbing Case History #58

Objective: Remove and install new production string

Well information:2100m, 10 Mpa Multi-zone gas well

Procedure: Rig up 11 inch spool & 11 inch stripping rams/ pressure test spool and rams. Rig up snubbing stack pressure test stack. Equalize stack, bring 11” tubing hanger into spool close rig bag bleed off stack disconnect snubbing unit from stack, including bleed off and equalize line walk jack up pipe place c-plate and rig slips on rig annular BOP, set tubing string in slips walk jack down set weight on boards placed on rig slips chain snubbing unit into rig and break landing joint from tubing hanger, walk jack up landing joint after releasing from derrick then break tubing hanger from tubing string. Walk jack back down landing joint and chain in to derrick then stab landing joint and make connection to tubing string grab hold of landing joint with snubbing jack release jack from derrick walk jack back joint. Pick up tubing string with rig blocks , remove rig slips and c-plate, walk snubbing stack back down bolt on flanges, re-equalize stack open annular BOP. Stage out of hole 214 joints of 3 ½ Hydril pipe, locate 10 ft pup joint in stripping rams, pull into rams, bleed off stack walk jack up joint break connection with pipe wrenches in desired location holding onto pipe with travelling snubbing slips and rotary bearing unlocked once connection is broken walk jack back down remove joint from stack, and rig out snubbing stack. Once jack was laid over we then rigged in linker and lubricated out the 9 5/8 packer and bottom hole assembly. While lubricating out BHA snubbing unit was changed over to 2 3/8 as was the primary stack once the BHA was out and lubricator was laid down. We then snubbed in the production string consisting of a TEP ,4 ft pup, XN , 1 joint, X , 8ft pup and tubing to surface added a 10 ft pup 1 joint, we then staged in some methanol to clean the casing bowl and stripped in our 11’ tubing hanger in the same method as previously described only in reverse. Once tubing hanger was landed we pull tested and tested for leaks. The snubbing stack was then rigged out.

Time on location: 5 days

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Snubbing Case History #59

Objective: Mill out BP at surface

Well Information: 2800m Sweet multi zone gas well. 43MPa

Procedure: Rig up 10k stripping rams on well, pick up snubbing unit and rig out 5K stripping rams. Rig up unit on 10K stripping rams. Place concrete anchors and chain down the unit. Rig up scaffold to the unit. Pressure test 10K primary and stripping rams to 50MPa. RIH overshot, x/o, 2 floats, x/o, 3m pup, 1jt of 60.3mm latch onto the setting tool and pull 7Dan to shear off of the bridge plug. RIH mill, 2 floats, motor, jars, x/o, 1jt and rig up selective iron to circulate. Pressure test iron to 50Mpa and begin milling out bridge plug. Once plug is drilled run in 2jts to ensure annulus is clear, pull out of the hole and rig down the unit.

Time on location: 28 hours

Snubbing Case History 59

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Snubbing Case History #60

Objective: Wellhead upgrade on horizontal CO2 injection well: reposition permanent packer

Well Information: CO2 injection well, 1300 meters vertical and 1000 meters horizontal 5000 kPa

Procedure: Rig up and pressure test self-contained snubbing unit. Attempt to unset packer – unable to, attempt to come off packer with on / off – unable to. Rig in eline and cut off string at bottom of vertical section. Packer was supposedly set in compression but was actually set in tension, once cut was made 101 joints of tubing and packer fell into horizontal section of well. Set plug in permanent plug at bottom of remaining tubing string and snub out.  Snub back in with fishing string and latch onto fish. Snub out fish until packer is back in cased hole and started to pull over string weight. Spot acid to remove packer elements. Continue to snub out of hole until 20 joints remain. Rig in wireline and pull tubing plugs. Pressure test on top of plug in packer, pressure test OK. Set permanent bridge plug in joint above packer. Snub out to BHA at surface, and hang off in QRC. Rig out travelling plate and slips. Rig in eline and lubricate out 21 meter fish. Lubricate in 18 meter permanent plug and set. Pressure test permanent plug and rig out self-contained snubbing unit.

Time on location: 20 days on location

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Snubbing Case History #61

 Objective: Snub out 3 ½” coil string and set permanent packer for future completion.

 Well Information: 1500 meter 1000kPa injection well

 Procedure: Rig up and pressure test self-contained snubbing unit.  Make up spear and go it and retrieve coil tubing hanger. Snub out 3 ½” coil in 7 – 8 meters sections, cutting each section with casing cutter. Tally each section of coil tubing pulled to ensure location of tubing plug. Continue to snub out until tubing plug is found inside tubing with plum bob. Snub up BHA and close blind rams. Bleed off and lay down BHA. Changeover to 2 7/8” handling equipment and make a scraper run. Run in permanent packer and set. Pressure test packer and snub out. Rig out self- contained snubbing unit.

Time on location: 6 days on location

3 1/2″ coil

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Snubbing Case History #62

Objective: Snub in tubing string to perform cement job.

Well Information: Drilling rig unable to land 5 ½ casing string. Casing landed in rigs slips. Potential  5800 psi at surface.

Procedure: Due to possible surface pressures, 15K Bop stack was required. BOP stack needed to be rigged up on top of 5 ½ casing stump. Due to height of casing stump a sub structure was designed and built on location to support BOP stack and snubbing unit. X/O flange installed on top of 5 1/2 “ casing, sub structure positioned around casing stump, 15K BOP stack installed and supported by sub structure. Pressure test  BOP stack. Rig in e-line and set inflatable packer, rig out e-line. Rig up rig assist snubbing unit and pressure test BOP’s. Snub in BHA,  shift sleeve, position tubing and perform cementing operations. Snub out tubing and BHA. Rig out snubbing unit. Rig in e-line and set upper packer assembly. Rig out e-line, rig out 15K BOP’s and support sub structure. Unit released.

Time on location: 6 days 24 hour operations

IMG_0957  IMG_0986

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Snubbing Case History #63

Objective: Snub in Slick String

Well Information: Tight Hole

Procedure: Rig up S29 on 15K Stripping rams/rig up on 15K primary BOPS. Rig in power tongs, pressure test rams to 15K. Rig up Fox Hole system. Snub in Slick String at 35 +/-. Staging in ram to ram 4900 meters of 2⅞ TBG. Land tubing hanger, pressure test, and rig out equipment. Travel to location from base.

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