Feb. 4 – 8, 2013 2013 Gas-Lift Workshop 1

A Review of Weatherford Dual Barrier

Equipment

• Colin Rae – Regional Business Unit Manager

36th Gas-Lift Workshop Stavanger, Norway February 4 – 8, 2013

A Review of Dual Barrier Equipment

• Contents

– Dual External Valves and Standard Configuration –A Two

Pronged approach to Well Integrity

– DVX Configuration

– ISO 17078 V1 Qualified Mandrels

– Physical Testing and CFD

– Standard Configuration Barriers

– Marathon Alvheim

– Statoil Statfjord

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DVX Gas Lift Mandrel System

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Section View of Grooved DVX Mandrel

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CV2- DVX External Check Valve

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Standard Side Pocket and DVX Gas Lift Mandrel

7

DVX Mandrels 600 Delivered since 2005

Sidepocket Mandrels ISO 17078-1 E4, V1, F1, Q1,

• 4-1/2” 5-1/2” and 7” Grooved Sidepocket Mandrels

• Single and Multi-Groove units

• In use since 2008

• 4-1/2”, 5-1/2” and 7” Non-grooved Mandrels

• FEA to prove Pressure rating claims

• Strain gauge Testing to Validate FEA Calculations

• Mandrel Pressure Envelopes developed using

multiple FEA runs.

Sidepocket Mandrels ISO 17078-1 E4, V1, F1, Q1,

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DVX Gas Lift Mandrel Physical Testing

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DVX Gas Lift Mandrel Physical Testing

Pressure and Velocity points on DVX Mandrel

Pressure(psi) Velocity(ft/s)

Point 1 2451 0.5

Point 2 2341 67

Point 3 2224 253

Point 4 2230 223

Point 5 2104 193

Point 6 2041 267

Point 7 2035 96

Point 8 2039 46

Point 9 2000 135

Pressure and Velocity – in Standard Sidepocket

Point 9

Pressure(psi) Velocity(ft/s)

Point 1 2433 142

Point 2 2339 253

Point 3 2363 213

Point 4 2377 194

Point 5 2329 259

Point 6 2002 352

Point 7 2010 25

Point 8 2000 4

Metal to Metal Checks

• Unique Design which

directs flow away from

sealing surfaces

• Metal to Metal

• BARRIER QUALIFIED

– Pressure Rating-10,000 PSI

– Temperature Rating 150C

• Material – 718 Inconel

Closed Open

Metal / Flex Seal Combination Check

• Updated DVX design for Higher

Pressure &Temperature Rating

• Utilized proprietary PTFE based

Thermoplastic along with Metal to

Metal Primary Seal

• Can be utilized in both gas lift valve

and DVX side pocket applications

• BARRIER QUALIFIED

– Pressure Rating-10,000 PSI

– Temperature Rating 150C

• Material K-500 Monel body with 718

Inconel check dart

Closed Open

Dual External Valve Mandrel Concept

• 2005 Requirement

– No Recognized Barrier Standard

– API 11V1 + Erosion Flow Test with Zero Leakage

Requirement

– 400 BBl at 2bbl per minute

– Pressure tests before and after Flow Procedure

– Low Pressure Gas tests (100 psi)

– High Pressure Water tests (5000 Psi)

– Tests at Ambient and 70 Deg C

Internal/External Barrier Valve

• 2013 Valve Integrity Criteria

– Statoil Defined Barrier Standard, TR2385

– ISO 17078-2 V1 + Further Flow, Erosion, Cyclic,

Limited-Leak-Rate Testing.

– 10000 psi WP, 150 Deg C Operating Temperature.

– Availability of Metal to Metal Only, and M/M + Flexible Seal

Marathon Alvheim Area Fields

• 2 Sidepocket Mandrels per Well, Unloading and

Orifice

• 2006 Completions, 2008 Production, Present Day

• 19 Gas Lift Wells

• Example liquid production rates: 1000 - 3000 sm3/d

(6300- 19000 BLPD)

• Typical gas lift injection rate: 100000 Sm3/d

(3.5 Million SCF/D)

Marathon Alvheim Area Fields

Marathon Alvheim Single Well Completion

Marathon Alvheim Multilateral Completion

Marathon Alvheim Area Wells

• Timetable (Dates Approximate)

• 2008: 7 (One was shut in 2010 and has been

worked over)

• 2009: 4

• 2010: 3

• 2011: 3

• 2012: 1 (+Workover of 2008 well installed to be

brought on soon)

• 2013: (1) to be brought on soon.

Marathon Alvheim Area Fields

• What are the Significant Gas Lift Issues?

• DVX Used as Multiple Barrier option, effectively 4

checks in line

• DVX and Internal Valves Check Systems tested to

Zero Leakage after 2 Barrels per Minute Erosion

Flow

• Wells all Integrity Tested Regularly in accordance

with Norsok D-10

• No failed integrity tests in 5 years

Marathon Alvheim Area Wells

• One well equipment very recently returned for

examination

• Tubing was Tested prior to being Pulled

• Both Assemblies Pressure Tested and Passed

• No Erosion

• No Breakage

• Some Debris

• Ongoing Engineering Review for Lessons Learned

Statoil – Statfjord 2012 Barrier Gas Lift Valve

• Valve Testing completed to Statoil TR2385

Standards 2011

• Metal To Metal Check Sealing only

• 1st Units installed in January 2012

• 14 Wells equipped with new valve

• All units being tested per Norsok D-010 monthly

• No Units Returned from any wells

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Copyright

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– Display the presentation at the Workshop.

– Place it on the www.alrdc.com web site, with access to the site to be as directed by the Workshop Steering Committee.

– Place it on a CD for distribution and/or sale as directed by the Workshop Steering Committee.

Other uses of this presentation are prohibited without the expressed written permission of the company(ies) and/or author(s) who own it and the Workshop Steering Committee.

Feb. 4 – 8, 2013 2013 Gas-Lift Workshop 27

Disclaimer

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The Artificial Lift Research and Development Council and its officers and trustees, and the Gas-Lift Workshop Steering Committee members, and their supporting organizations and companies (here-in-after referred to as the Sponsoring Organizations), and the author(s) of this Technical Presentation or Continuing Education Training Course and their company(ies), provide this presentation and/or training material at the Gas-Lift Workshop "as is" without any warranty of any kind, express or implied, as to the accuracy of the information or the products or services referred to by any presenter (in so far as such warranties may be excluded under any relevant law) and these members and their companies will not be liable for unlawful actions and any losses or damage that may result from use of any presentation as a consequence of any inaccuracies in, or any omission from, the information which therein may be contained.

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