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Gas Well Deliquification Workshop Sheraton Hotel, Denver, Colorado February 17 – 20, 2013 Kees Veeken – Shell (NAM) Rahel Yusuf – SPT Group Model the Effectiveness.

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Presentation on theme: "Gas Well Deliquification Workshop Sheraton Hotel, Denver, Colorado February 17 – 20, 2013 Kees Veeken – Shell (NAM) Rahel Yusuf – SPT Group Model the Effectiveness."— Presentation transcript:

1 Gas Well Deliquification Workshop Sheraton Hotel, Denver, Colorado February 17 – 20, 2013 Kees Veeken – Shell (NAM) Rahel Yusuf – SPT Group Model the Effectiveness of Pump and Plunger by Transient Multi-Phase Flow Simulation

2 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 2 Contents Objectives Transient Vs Steady State Pump modeling Plunger modeling

3 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 3 Objectives How much back pressure is introduced by the flowing wet gas column in the presence of a pump that removes liquids from the bottom of the well ? –The outcome determines the effectiveness of a pump and defines the best ways of operating a pump What is the effectiveness of a plunger that travels up to the subsurface safety valve but does not cover the short distance between subsurface safety valve and wellhead ? –The outcome determines the requirement for a second plunger to dewater the top section

4 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 4 Transient Vs Steady State Pump intake pressure sits in between too high steady state VLP and too low dry gas VLP –How effective is downhole separation? –How steady is production and how much gas will enter pump ? Plunger action is transient in nature –Will slug of liquid be able to bridge gap ?

5 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 5 Pump Modeling Parameters 5.5 tubing + 5 liner down to 3040 m Pump on 1.5 CCT @ 3020 m Inflow across 2770-3040 m with 3% below pump Darcy inflow A=80 bara/(e3m 3 /d) Reservoir P res =35-55-65-75 bara WGR=23-7, CGR=10 m 3 /e6m 3 Wellhead pressure = 9 bara Constant mass pump rate for liquid and gas i.e. keeps pumping in case of gas ingress GasLiquidPower

6 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 6 OLGA Liquid Loading Point IPR – P res =69 bara LL – OLGA Q min =58e3 m 3 /d VLP – Modified Gray VLP - Gray VLP – Cullender-Smith

7 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 7 P res =55 bara – No Pumping Gas rate (e3 m3/d) Pressure @ pump intake (bara) Holdup @ pump intake (-) Liquid in wellbore (m3)

8 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 8 P res =55 bara – Pumping @ 1 m 3 /d Gas rate (e3 m3/d) Pressure @ pump intake (bara) Holdup @ pump intake (-) Liquid in wellbore (m3) Stable holdup @ pump intake: gassy liquid (8 Sm3/d gas)

9 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 9 P res =55 bara – Pumping @ 1 m 3 /d Significant holdup across bulk of wellbore

10 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 10 P res =55 bara – Pumping @ 1 m 3 /d Liquid holdup increases pump intake pressure

11 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 11 P res =55 bara – Pumping @ 2 m 3 /d Oscillating holdup @ pump intake: gassy liquid or gas Gas rate (e3 m3/d) Pressure @ pump intake (bara) Holdup @ pump intake (-) Liquid in wellbore (m3)

12 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 12 P res =55 bara – Pumping @ 2 m 3 /d Holdup is slugging up and down wellbore

13 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 13 P res =55 bara – Pumping @ 2 m 3 /d Pump intake pressure oscillates

14 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 14 P res =65 bara – Pumping @ 2 m 3 /d Oscillating holdup @ pump intake: gassy liquid or gas Gas rate (e3 m3/d) Pressure @ pump intake (bara) Holdup @ pump intake (-) Liquid in wellbore (m3)

15 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 15 Pumping Operating Points IPR – P res =75/65/55/35 bara VLP – Modified Gray VLP – Gray VLP – CS (dry & wet) OLGA – Pumping (m 3 /d) & LL

16 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 16 Pumping Summary Back pressure due to liquid holdup is unavoidable Magnitude increases as Q increases –Insignificant at low enough Q but significant at higher Q as downhole separation becomes less effective –Back pressure does not increase with higher WGR! –Production penalty increases as inflow improves! Gas ingress into pump depends on pump rate and location of pump intake relative to inflow profile –Pump off triggers slugging and large gas ingress Further explore influence of pump location, liner size and deviation on back pressure and gas ingress

17 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 17 Plunger Modeling Parameters 3.5 tubing to 1169 m, 5x4.5 liner to 1310 m Plunger between launch @ 1145 m and trap @ 0-330 m (SSSV @ 102 m) Inflow @ 1310 m, A=5.2 bara/(e3m 3 /d) P res =12-18 bara, WGR=10-88 m 3 /e6m 3, CGR=0 m 3 /e6m 3 Wellhead pressure = 8 bara 3.5 tubing plunger weight = 7.5 kg, zero leakage, SV or 3 bara BPV 9 plunger cycles 2 hr flow, 1 hr shut-in 17 Tubing Wellbore PL Trap Launch SV

18 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 18 Field – No Plunger, Close to LL THP (barg) Gas Rate (Nm 3 /d) 1 hr flow, 0.5 hr shut-in FTHP (bara) Gas Rate (Nm3/d)

19 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 19 Field – Plunger 11 hrs ON, 1 hr OFF THP (barg) Gas Rate (Nm 3 /d) 1 hr flow, 0.5 hr shut-in TT~20 min (excessive) VEL~52 m/min (170 ft/min) ON period too long FTHP (bara) Gas Rate (Nm3/d)

20 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 20 Field – Plunger 2 hrs ON, 1 hr OFF THP (barg) Gas Rate (Nm 3 /d) 1 hr flow, 0.5 hr shut-in TT~5 min VEL~209 m/min (690 ft/min) FTHP (bara) Gas Rate (Nm3/d)

21 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 21 WGR=88 m 3 /e6m 3, P res =17.5 16.5bara Gas rate (Sm 3 /d) Cumulative Liquid (m 3 ) Liquid in tubing (m 3 ) Liquid in wellbore (m 3 ) Q min =29e3m 3 /d @ P res =16.9bara

22 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 22 OLGA Liquid Loading Points IPR – Pres=14.3-16.9 bara VLP – Modified Gray WGR=10-88 m 3 /e6m 3 OLGA LL Points WGR=10-88 m 3 /e6m 3

23 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 23 WGR=88, P res =15, Trap @0, BPV (#8) THP (bara) Gas rate (Sm 3 /d) Liquid in Tubing (m 3 ) Liquid in Wellbore (m 3 ) Plunger Velocity (m/s) Plunger Position (m) TT~6.5 min VEL~161 m/min (530 ft/min)

24 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 24 WGR=88, P res =15, Trap @0, SV, 23.9 hr Holdup Tubing (-) Pressure Tubing (bara) Holdup Wellbore (-) Pressure Wellbore (bara)

25 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 25 WGR=88, P res =15, Trap @0, SV, 24.05 hr Holdup Tubing (-) Pressure Tubing (bara) Holdup Wellbore (-) Pressure Wellbore (bara)

26 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 26 WGR=88, P res =15, Trap @0, SV, 24.1 hr Holdup Tubing (-) Pressure Tubing (bara) Holdup Wellbore (-) Pressure Wellbore (bara)

27 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 27 WGR=88, P res =15, Trap @0, SV, 24.15 hr Holdup Tubing (-) Pressure Tubing (bara) Holdup Wellbore (-) Pressure Wellbore (bara)

28 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 28 WGR=88, P res =15, Trap @0, SV, 25.9 hrs Holdup Tubing (-) Pressure Tubing (bara) Holdup Wellbore (-) Pressure Wellbore (bara) Holdup Tubing (-) Pressure Tubing (bara) Holdup Wellbore (-) Pressure Wellbore (bara)

29 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 29 WGR=88, P res =15, Trap @0, SV, 26.05 hr Holdup Tubing (-) Pressure Tubing (bara) Holdup Wellbore (-) Pressure Wellbore (bara)

30 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 30 WGR=88, P res =15, Trap @0, SV, 26.1 hr Holdup Tubing (-) Pressure Tubing (bara) Holdup Wellbore (-) Pressure Wellbore (bara)

31 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 31 WGR=88, P res =15, Trap @0, BPV (#8) THP (bara) Gas rate (Sm 3 /d) Liquid in Tubing (m 3 ) Liquid in Wellbore (m 3 ) Plunger Velocity (m/s) Plunger Position (m) TT~6.5 min VEL~161 m/min (530 ft/min)

32 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 32 WGR=10, P res =15, Trap @0, SV THP (bara) Gas rate (Sm 3 /d) Cumulative Liquid (m 3 ) Liquid in Tubing (m 3 ) Liquid in Wellbore (m 3 )

33 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 33 WGR=10, P res =15, Trap @0, SV (#8) THP (bara) Gas rate (Sm 3 /d) Liquid in Tubing (m 3 ) Liquid in Wellbore (m 3 ) Plunger Velocity (m/s) Plunger Position (m) TT~3.0 min VEL~350 m/min (1150 ft/min)

34 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 34 WGR=10, P res =14, Trap @0, SV (#8) THP (bara) Gas rate (Sm 3 /d) Liquid in Tubing (m 3 ) Liquid in Wellbore (m 3 ) Plunger Velocity (m/s) Plunger Position (m) TT~3.3 min VEL~320 m/min (1050 ft/min)

35 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 35 WGR=10, P res =13, Trap @0, SV (#8) THP (bara) Gas rate (Sm 3 /d) Liquid in Tubing (m 3 ) Liquid in Wellbore (m 3 ) Plunger Velocity (m/s) Plunger Position (m) TT~4 min VEL~260 m/min (850 ft/min)

36 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 36 WGR=10, P res =12, Trap @0, SV (#4) THP (bara) Gas rate (Sm 3 /d) Liquid in Tubing (m 3 ) Liquid in Wellbore (m 3 ) Plunger Velocity (m/s) Plunger Position (m) TT~5 min VEL~209 m/min (690 ft/min)

37 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 37 WGR=88, P res =15, Trap @0, BPV THP (bara) Gas rate (Sm 3 /d) Cumulative Liquid (m 3 ) Liquid in Tubing (m 3 ) Liquid in Wellbore (m 3 )

38 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 38 WGR=88, P res =15, Trap @50, SV THP (bara) Gas rate (Sm 3 /d) Cumulative Liquid (m 3 ) Liquid in Tubing (m 3 ) Liquid in Wellbore (m 3 )

39 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 39 WGR=88, P res =15, Trap @102, SV THP (bara) Gas rate (Sm 3 /d) Cumulative Liquid (m 3 ) Liquid in Tubing (m 3 ) Liquid in Wellbore (m 3 )

40 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 40 WGR=88, P res =15, Trap @330, SV THP (bara) Gas rate (Sm 3 /d) Cumulative Liquid (m 3 ) Liquid in Tubing (m 3 ) Liquid in Wellbore (m 3 )

41 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 41 With Plunger – Operating Points IPR – Pres=14.3-16.9 bara VLP – CS WGR=11-88 m 3 /e6m 3 – LL WGR=11-88 m 3 /e6m 3 O – WGR=11, Trap=0 – WGR=88, Trap=0 – WGR=88, Trap=102

42 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 42 Plunger Summary Transient multi-phase flow model produces credible results and provides insight into influence of well parameters on plunger performance Plunger needs to travel to top of tubing to deliver maximum value i.e. liquid slug cannot bridge large gap Plunger introduces back pressure proportional to WGR which can limit applicability in prolific wells –Gas production during upward travel must deliver minimum plunger velocity and will diminish as slug size increases Further explore influence of plunger launch position, wellbore (plus annulus) volume, inflow performance and plunger ON/OFF schedule

43 Feb. 17 – 20, 20132013 Gas Well Deliquification Workshop Denver, Colorado 43 Copyright Rights to this presentation are owned by the company(ies) and/or author(s) listed on the title page. By submitting this presentation to the Gas Well Deliquification Workshop, they grant to the Workshop, the Artificial Lift Research and Development Council (ALRDC), and the Southwestern Petroleum Short Course (SWPSC), rights to: –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 use of this presentation is prohibited without the expressed written permission of the author(s). The owner company(ies) and/or author(s) may publish this material in other journals or magazines if they refer to the Gas Well Deliquification Workshop where it was first presented.

44 Feb. 17 – 20, 2013 2013 Gas Well Deliquification Workshop Denver, Colorado 44 Disclaimer The following disclaimer shall be included as the last page of a Technical Presentation or Continuing Education Course. A similar disclaimer is included on the front page of the Gas Well Deliquification Web Site. The Artificial Lift Research and Development Council and its officers and trustees, and the Gas Well Deliquification 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 Well Deliquification 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. The views, opinions, and conclusions expressed in these presentations and/or training materials are those of the author and not necessarily those of the Sponsoring Organizations. The author is solely responsible for the content of the materials. The Sponsoring Organizations cannot and do not warrant the accuracy of these documents beyond the source documents, although we do make every attempt to work from authoritative sources. The Sponsoring Organizations provide these presentations and/or training materials as a service. The Sponsoring Organizations make no representations or warranties, express or implied, with respect to the presentations and/or training materials, or any part thereof, including any warrantees of title, non-infringement of copyright or patent rights of others, merchantability, or fitness or suitability for any purpose.


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