Gate Valve Drilling & Hot Tap Case Histories

Gate Valve Drilling & Hot Tap Case Histories

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1

Date; 8/9/10

Customer; Alert / Conoco

Location; Sumatra Indonesia

Well; Leko 7

Mill Type; 2” Bull nose junk mill

Gate Size; 2 1/16”

Pressure; 450psi on the annulus while well flowed to the flare pit

Time to mill; 20 minutes

Description; Mill through casing valves so well kill operations could be performed on blow out.



2

Date; 22/9/10

Customer; Alert / Conoco

Location; Sumatra Indonesia

Well; South Rawa 1

Mill Type; 2 7/16” Flat nose junk mill


Pressure; 1200psi

Time to mill; 45minutes

Description; Mill broken lower master valve so plugs could be set and tree valve replaced repaired.



3

Date; 15/1/11

Customer; Energean

Location; Kavala Greece

Well; PB-16A

Mill Type; 3” Bull nose


Pressure; 1500psi & 63% H2s

Time to mill; 2 hr 15minutes

Description; Mill broken lower master valve (dual tree long string) so plugs could be set and tree valve replaced repaired.



4

Date; 15/6/11

Customer; Shell BSP

Location; Brunei

Well; N/a

Mill Type; Internal tubing cutter 3”

Gate Size; N/a

Pressure; N/a

Time to mill; 20minutes to cut tubing.

Description; Perform trial tubing cut on 3 ½” tubing. To prove feasibility of cut so tree and well head can be replaced in one lift. Tree & Well heads in poor state and none repairable. Cameron well heads delivered in 2013 Q1 for well S462 & S773. GVD Unit scheduled for return March 2013.



5

Date; 22/04/13

Customer; Alert / Shell BSP

Location; Brunei

Well; S- 462


Gate Size; N/a

Pressure; N/a

Time to mill; 10 minutes to cut tubing.

Description; Perform tubing cuts on two wells with badly corroded Xtree and tbg head spools. Completion 3 ½” tubing. Tree & tbg head spool removed after freeze applied. P&A both wells.

S-462 Tubing Cut



6

Tubing cut below Hanger.



7

Date; 25/05/13

Customer; Alert / Shell BSP

Location; Brunei

Well; S- 773


Gate Size; N/a

Pressure; N/a

Time to mill; 20 minutes to cut tubing.

Description; Perform tubing cut on 3 ½” tubing for Freeze and P&A

S-773 Tubing Cut



8

Tree removed after tubing cut and freeze applied.

TMK Gate Valve Drilling Unit with cutter BHA.

TMK GVD & HT units.



9



10

Date; 13/12/13

Customer; Shell UK

Location; Brent Bravo North Sea

Well; BB-02

Drill Type; 22mm Drill Rod

Time to complete; 30 minutes per Tap. Two taps performed

Description; Perform Hot Tap on 7” tubing between permanent Bridge plugs set in lower completion. Bleed off 1300psi. Perform Hot Tap on 5.5” tubing below junk plug stuck in SPM.

Hot Tap 7” Tubing

Unit rigged up on 7”



11

Tapped Hole



12

Date; 16/06/14

Customer; Shell Ireland

Location; Ocean Guardian West Coast Ireland

Well; Corrib P6

Drill Type; 22mm Drill Rod

Time to complete; 40 minutes per Tap. Two taps performed

Description; Perform Hot Tap on 5” tubing between Interwell Bridge plugs set in lower completion. Bleed off 2800psi. Perform Hot Tap on 5” tubing between lower Interwell Bridge plug and Halliburton HX4 junk plug stuck in crossover. Bleed off 120psi.

Unit rigged up on 5”

5” Tubing after Hot Tap



13

22mm Hole



14

Date; 29/10/14

Customer; Alert Disaster Control

Location; Papua New Guinea

Description; Excavate cellar and perform multiple casing cuts so Well Head and BOPs could be installed on shallow gas blow out.



15

Date; 8/10/2015

Customer; Talisman Sinopec Energy UK Limited

Location; Montrose Platform North Sea

Well; A21

Mill Type; 4” Stepped Mill

Gate Size; 4 1/16” 410SS

Pressure; 500psi

Time to mill; Swab 9hr, Lower Master 5.25hr

Description; Mill Swab and Lower Master valves so tree could be replaced after plugs set.

A21



16



17

Date; 14/11/15

Customer; Talisman Sinopec Energy UK Limited

Location; Montrose Platform North Sea

Well; A03


Gate Size; 4 1/16” 410SS

Pressure; 500psi

Time to mill; 2.5hr

Description; Mill Lower Master valve so tree could be replaced after plugs set.

A03



18

Date; 10/06/16

Customer; Taqa Bratani Limited

Location; Cormorant Alpha

Well; N/A

Mill Type; 22mm Drill Rod c/w 10mm Drill

Ball Valve 12”; VB 12” Ball Valve

Pressure; Unknown

Description; Design and build a Hot Tap unit and Offset Clamp suitable for drilling into 12” Ball Valve cavity so sealant can be injected.



19

Date; 20/07/17

Customer; Apache UK

Location; Forties Alpha

Well; Well FA 5-6

Mill Type; 6.25” Stepped Mill

Gate Size; 7 1/16” INCOLOY

Pressure; 500psi

Time to mill; 38hr (NOTE: Incoloy gates)

Description; Mill Lower Master valve on injector.



20

Date; 26/10/17

Customer; Southern North Sea

Location; Southern North Sea

Well; Well 27 D


Gate Size; 5” 4140

Pressure; 1000psi

Time to mill; 9hr

Description; Mill Lower Master valve.



21

Date; 20/01/18

Customer; EnQuest

Location; Thistle Platform

Well; Well A47 Slot 47


Gate Size; 3” 4140

Pressure; 2200psi

Time to mill; 1hr

Description; Mill Lower Master valve.



22

Date; 17/03/18

Customer; EnQuest

Location; Heather Platform

Well; Well H-63


Gate Size; 5 1/8” 4140

Pressure; 1200psi

Time to mill; 7hr

Description; Mill partially open Lower Master valve.

Gate Valve Drilling & Hot Tap Case Histories

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