Pipelines & Flow Assurance

Size: px

Start display at page:

Download "Pipelines & Flow Assurance"

Sabrina Thomas
5 years ago
Views:

1 Pipelines & Flow Assurance

2 Angus Macaulay Subsea Engineering Team Lead Paradigm Flow Services

3 SUBSEA EXPO 2016 Free the Pigs - Case Study Angus Macaulay Subsea engineering co-ordinator Paradigm Flow Services Ltd

4 Pipeline blockages blockages occur as the oil cools off in the colder environment and the cloud point is reached, wax begins to form.

5 Pipelines Two regions are identified during this process: the liquid and gel regions. dissolved wax molecules moving from the pipe centre toward the wall due to temperature gradient. O Tamb Twat Tl Gel region containing liquid oil and precipitated wax crystals Inside Pipe temperature profile G Dissolved wax molecules Migrating towards the liquid-gel Interface where T=WAT R, m L Mass flux of wax molecules from the interface to the pipe wall Liquid region Pipe wall

6 Pigging Pigging; Less downtime Reduced waste processing Improved plant efficiency Lower overall service costs

7 Pipeline Overview Details; Constructed in ID 92 km in length 7.9mm Wall thickness (9.5mm at river crossings) Design pressure 1280 Psi (88.3 Barg) Design Temp 10⁰C 43.3⁰C Total fill volume 17,675 mᶟ 200 m Pipeline Topography Sea level River crossings

8 Problems with Pigging

9 Potential solutions Options; Pumping at higher pressures in both directions Volumetric test to approximate blockage location Localised Hot oil flush Excavation of pipeline

10 Potential solutions

11 Potential solutions

12 Potential solutions Human resource manager Marketing manager Logistics manager Technologie s manager IT manager Project manager Health and safety Business analyst PR manager Product developer Poor chap doing the work

13 Pipe-Pulse option 48hr from initial call with client until arrival of crew & equipment onsite

14 Pipe-Pulse set up Control cabin Air hydro pump To Finnart Tank High pressure pump To Tie in point HV-001 Ref DWG N P F S L B Vent to Sump P F S L A Pipe-Pulse units Vent to Sump PLR PT REVISIONS Kinneil site rig up P&ID No Date Description 1 Choke valve (CV) PRV DRAWING NO LATEST REVISION Rev A3 SCALE JOB NO N/A 0732 CHECKED K Thomson DRAWN BY Angus Macaulay Needle valve (NV) Plug valve (PV) Ball valve (BV) PRV dump line High pressure line Data transfer Ethernet cable

15 Pipe-Pulse set up

16 Pipe-Pulse set up

17 Find-Block results

18 Find-Block results Time response Reflection Initial pulse

19 Pipe-Pulse set up To Kinneil Control cabin Warm fluid out Cold fluid in Air hydro pump Tank Heat exchanger 20" Finnart Export line High pressure pump Warm fluid out Cold fluid in Heat exchanger HV696 2" RF600-2" 1502 Pulsing Tie in point PT Pipe-Pulse injection Line Crude feed from HV258. Flanged 4" RF150-4" 206 P F S L A P F S L B Pipe-Pulse units Vent to Sump Vent to Sump Vent to Sump HV701 4" RF600-2" 1502 Flushing Tie in point PLR Pumping injection Line REVISIONS Finnart site rig up P&ID No Date Description 1 Choke valve (CV) PRV DRAWING NO LATEST REVISION Rev A3 SCALE JOB NO N/A 0732 CHECKED K Thomson DRAWN BY Angus Macaulay Needle valve (NV) Plug valve (PV) Ball valve (BV) PRV dump line High pressure line Data transfer Ethernet cable

20 Pipe-Pulse set up

21 Pipe-Pulse set up

22 Pipe-Pulse set up

23 Wax removal

24 Wax removal

25 Wax removal

26 Wax removal

27 Wax removal

28 Wax removal

29 Wax removal

30 Wax removal

31 Wax removal

32 Success

33 To Conclude Ability to pulse into large diameter lines over long distances Accurately locate blockage within +/- 50m using Find-Block Reduce/Eliminate the need for pipeline Intervention reducing costs of pipeline blockages and restrictions

34 It s time for a Paradigm Shift in Flowline Intervention

Pipelines & Flow Assurance

Pipelines & Flow Assurance Jamie Littler Technical Disciplines and Assurance Manager Shell UK Flow Assurance Wax Study on the Ravn Field Production System Wood Group Kenny: Hooman Haghighi, Jamie Littler,