1. TUSTP 2003 By Angel Bustamante May 20, 2003 By Angel Bustamante May 20, 2003 DOE Project: Design and Performance of Multiphase Distribution Manifold DOE Project: Design and Performance of Multiphase Distribution Manifold

2.  Introduction  Objectives  Experimental Program  Manifold Design  Future work TopicsTopics

3. IntroductionIntroduction  Wells connected to a manifold have a different liquid and gas flowrate  Provide and guarantee equal split of gas and liquid flow for downstream separators  Protect downstream metering equipment and provide high accuracy of metering  Multiphase distribution manifold, as a flow conditioning device:

4. ObjectivesObjectives  Develop a lab prototype multiphase distribution manifold  Acquire systematic experimental data for performance evaluation evaluation  Develop a mechanistic model  Design tool  Performance evaluation  System optimization

5. Experimental Program   Experimental Facility   Test Matrix   Results   System Operational Envelope   Manifold Operational Envelope   Liquid and Gas Split Ratios   Manifold Resistance Coefficient (K l )   Transient Performance

6. Experimental Facility

7. Flow Configurations 1234 L G LL CASE 1 1 2 3 4 L L LG CASE 2 1 2 3 4 L G LG CASE 3 1 2 3 4 L L GG CASE 4 1 2 3 4 G G LL CASE 5 1 2 3 4 L G GG CASE 6 1 2 3 4 G G LG CASE 7 Test Matrix Vsg: 10.5 fts/s to 30.5 ft/s, Vsl: 1.0 ft/s to 2.75 ft/s 1 2 3 4 CASE 8 L/G

8. System Operational Envelope 1234 L G LL CASE 1

9. 1 2 3 4 L L LG CASE 2 System Operational Envelope

10. 1 2 3 4 L G LG CASE 3 System Operational Envelope

11. 1 2 3 4 L G GG CASE 6 System Operational Envelope

12. 1 2 3 4 G G LG CASE 7 System Operational Envelope

13. 1 2 3 4 CASE 8 L/G THE SAME ENVELOPE APPLIES TO CASES IV AND V 1 2 3 4 L L GG CASE 4 1 2 3 4 G G LL CASE 5 System Operational Envelope

14. Manifold Operational Envelope

15. Liquid Split ( GLCC# 2 over Total Flow) v.s. GVF 0.40 0.50 0.60 0.70 0.80 0.90 1.00 0.750.80.850.90.951 GVF Liquid Split Case I Case III Case VI 1234 L G LL CASE 1 1 2 3 4 L G LG CASE 3 1 2 3 4 L G GG CASE 6 Liquid Split Ratios

16. 1 2 3 4 L L GG CASE 4 1 2 3 4 G G LL CASE 5 1 2 3 4 CASE 8 L/G Liquid Split Ratios

17. 1 2 3 4 L L LG CASE 2 1 2 3 4 G G LG CASE 7 Liquid Split Ratios

18. 1234 L G LL CASE 1 1 2 3 4 L G LG CASE 3 1 2 3 4 L G GG CASE 6 Gas Split Ratios

19. 1 2 3 4 L L GG CASE 4 1 2 3 4 G G LL CASE 5 1 2 3 4 CASE 8 L/G Gas Split Ratios

20. 1 2 3 4 L L LG CASE 2 1 2 3 4 G G LG CASE 7 Gas Split Ratios

21. Liquid / Gas Split Ratios Cases I / III / VI Liquid and Gas Split ( GLCC# 2 over Total Flow) v.s. GVF Cases I / III / VI 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0.750.800.850.900.951.00 G.V.F. Liq Split 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Gas Split Case I Case III Case VI LIQUID SPLIT GAS SPLIT

22. Resistance Coefficient (Kl) for Manifold Manifold Resistance Coefficient LIQ WELL LIQ WELL h h h h

23.   K l is calculated using the following equation Where V’ sl is the liquid velocity in each liquid leg Manifold Resistance Coefficient

24. LIQ WELL LIQ WELL Manifold Resistance Coefficient

25. Transient Performance Vsg=0 ft/s 0.00 0.50 1.00 1.50 2.00 2.50 020406080100120140 t (s) Vsl (ft/s) Total Flow In Total Flow Out Flow in GLCC # 2 Flow in GLCC # 1 Total Flow In Total Flow Out GLCC # 1 GLCC # 2

26. Transient Performance Total Flow In Total Flow Out GLCC # 1 GLCC # 2

27. Manifold Design   Diameter   Manifold   Outlets   Inlet Wells Arrangement   Design Example

28. Manifold Sizing The Design Code is based on simplified Kelvin-Helmholtz stability analysis The stabilizing gravity force acting on the wave is, The pressure suction force causing wave growth is given by,

29. Manifold Sizing   Two criteria were evaluated to determine the manifold diameter   Criterion 1: Diameter is calculated only considering each section separately

30. Manifold Sizing   Criterion 2: Diameter is calculated considering the effect of one well on its neighbors

31. Outlets Sizing Liquid Outlets Gas Outlets 1 2 2   V Kg P  G G V Q A 

32. Wells Arrangement   Based on experimental results, two modifications were proposed to Avila-Gomez model   Proposal 1: Make well arrangement based on ratio Q mixture /Q l   Proposal 2: Make well arrangement locating wells with high gas flow rates in middle section of manifold.

33. Design Example Example of manifold with seven wells connected

34. Design Code Auto-arrangement considering proposal # 1

35. Design Code Auto-arrangement considering proposal # 2

36. Future Work   Design Code

37. Safety Tip

38. QUESTIONSQUESTIONS ?