Rod String Design Software Simulation of Sandia Downhole Load Cell Wells

Transcription

1 10 th Annual Sucker Rod Pumping Workshop Renaissance Hotel Oklahoma City, Oklahoma September 16-19, 2014 Rod String Design Software Simulation of Sandia Downhole Load Cell Wells by Norman W. Hein, Jr., P.E. Norris/AOT & DAL Lynn Rowlan Echometer Scott Malone Norris DAL

2 Content Background & prior software simulation comparison Sandia well & operating information Rod string software & results Comparison with actual loads Summary & Conclusions Sucker Rod Pumping Workshop; DAL/NWH 2

3 Background A Current Comparison of Sucker Rod String Design Programs By Norman W. Hein, Jr., P.E. Oil & Gas Optimization Specialists, Ltd. & Russell Stevens, Norris Paper #7 - Presented at Southwestern Petroleum Short Course (SWPSC), April 21/22, 2004 Sucker Rod Pumping Workshop; DAL/NWH 3

4 Purpose Compared predictive steel, vertical rod string design results to actual dynamometer cards using: Q Rod Rod Star S Rod Lufkin LoadCalB (API) Conoco Modified API (no sinker bars) Sucker Rod Pumping Workshop; DAL/NWH 4

5 Accuracy Fig. 5. Well #1 Accuracy Comparison % % % 90.00% 80.00% Wrf =SVL (lb) TVL (lb) PPRL (lb) MPRL (lb) Max Rod Stress... Diff. A Diff. B Diff. C Diff D Diff. E Sucker Rod Pumping Workshop; DAL/NWH 5

6 Accuracy Fig. 8. Well #3b Accuracy Comparison % % % % 50.00% 0.00% Diff. A Diff. B Diff. C Diff. D Diff. E Wrf =SVL (lb) TVL (lb) PPRL (lb) MPRL (lb) Max Rod Stress (psi) Sucker Rod Pumping Workshop; DAL/NWH 6

7 Results Comparison showed not all the required loads and nondimensional operating parameters that are required for optimization and troubleshooting were provided by all the programs Inaccuracies may be within 10 to 15% for simple string When sinker bars installed and comparison made, inaccuracies may be from -40% to +25% of actual measurements Maintained belief that programs cannot accurately predict dynamic effects of sinker bars Some programs were changed over time plus new capabilities of designing effect of well bore deviations included Sucker Rod Pumping Workshop; DAL/NWH 7

8 Sandia well & operating data Sucker Rod Pumping Workshop; DAL/NWH 8

9 Well No. Depth Casing Tubing Seat Nipple TAC Depth Rod No. Coupling Guides PBD (ft) (in) (in) Depth (ft) (ft) & grade Size Installed /C FS 2/rod " FRP to 4362'; 1.0" D to 7564' /D w 408' 1.0" D SB /D w 300' 1.25" SB 5a /D w 250' 1.5" SB 5b /D w 250' 1.5" SB /N-97 w 500' 1.5" SB SHSM - FRP; FSSM - D SHSM - 1"; FSSM 7/8" Sucker Rod Pumping Workshop; DAL/NWH FS 0 SH - 1"; FS - rest SH - 1"; FS - rest 2/rod on 3/4" 2/rod on 3/4" FSSM 0

10 Well No. 1 Pump Dia Pump Length Unit Size Motor Tubing Casing Produced Fluid (in) (Ft) (HP) Pressure (psi) Press (psi) G M Rotoflex M a 2 24 M b 2 24 M vacuum Sucker Rod Pumping Workshop; DAL/NWH 10

11 Well No a 5b 6 N S Fluid Level Tool (spm) (in) FAP (ft) Depths (ft) #1- below pump - Not Work (NW); #2 - above #3-2462' (in 3/4"); #4-1010' (in 3/4"); #5 - Below ' #1 - below pump; #2 - above #3-7489' (75' above pump) - NW; #4-4362' (FG to Stl x); #5-4285' (75' above x) #1 - above pump 9229'; #2-9087' (in 1" SB); #3-8785' (in 1" SB); #4-7658' (SB to 7 x); #5-7506' (in 7/8") #1 - below pump; #2 - above #3-2708' (SB to 6 x); #4-1006' (6 to 7 x); #5 - below #1 - below pump; #2 - above #3-4741' (SB to 7 x); #4-4714' (25' above x); #5 - below #1 - below pump; #2 - above #3-4741' (SB to 6 x); #4-3114' (6 to 7 x); # (7 to 8 x) #1 - below pump; #2 - above #3-2783' (in SB); Sucker Rod Pumping Workshop; #4-2356' DAL/NWH (SB to 7 x); 11 #5 - below

12 Rod Design Software Evaluated Programs considered: QRod RodStar Srod Program defaults used Assumption for pump/plunger friction = -200 pounds While some wells reported with guides, deviation surveys not available so assumption all wells vertical Assumed friction coefficient = 0.2 no guides; 0.3 w/guides One program did not have the Rotoflex geometry in analysis capabilities; so CW Conventional unit used Sucker Rod Pumping Workshop; DAL/NWH 12

13 Sandia load translation using DHLC Sucker Rod Pumping Workshop; DAL/NWH 13

14 SANDIA Test AHC SSAU /04/96 10:00 AM Sept ,

15 From L. Rowlan: Update on Sandia Downhole Dynamometer Testing, SRL WS, OKC, 09/18/2014 Sucker Rod Pumping Workshop; DAL/NWH 15

16 Well 1 Sept , Sucker Rod Pumping Workshop 16

17 Well 2 Sept , Sucker Rod Pumping Workshop 17

18 Well 3 Sept , Sucker Rod Pumping Workshop 18

19 Well 4 Sept , Sucker Rod Pumping Workshop 19

20 Well 5A Sept , Sucker Rod Pumping Workshop 20

21 Well 6 Sept , Sucker Rod Pumping Workshop 21

22 Summary Programs versus actual load Sucker Rod Pumping Workshop; DAL/NWH 22

23 Tabular Comparison Well 1 Load Sandia Prog 1 % Prog 2 % Prog 3 % PPRL MPRL MPL Sucker Rod Pumping Workshop; DAL/NWH 23

24 Tabular Comparison Well 2 Load Sandia Prog 1 % Prog 2 % Prog 3 % PPRL , , , MPRL MPL Sucker Rod Pumping Workshop; DAL/NWH 24

25 Tabular Comparison Well 3 Load Sandia Prog 1 % Prog 2 % Prog 3 % PPRL 39,972 52, , , MPRL , , MPL Sucker Rod Pumping Workshop; DAL/NWH 25

26 Tabular Comparison Well 4 Load Sandia Prog 1 % Prog 2 % Prog 3 % PPRL 8, , , MPRL 1,977 3, , , MPL -93-2, Sucker Rod Pumping Workshop; DAL/NWH 26

27 Tabular Comparison Well 5A Load Sandia Prog 1 % Prog 2 % Prog 3 % PPRL 15,507 16, , MPRL MPL Sucker Rod Pumping Workshop; DAL/NWH 27

28 Tabular Comparison Well 6 Load Sandia Prog 1 % Prog 2 % Prog 3 % PPRL 13,344 15, , , MPRL MPL Sucker Rod Pumping Workshop; DAL/NWH 28

29 Conclusions & Recommendations Currently program 2 &3 are very close to the same accuracy Program 3 had a consistent -200 pound minimum pump load (MPL) which was related to the 200 pound of assumed pump friction If this friction was removed, then MPL would be very close Sucker Rod Pumping Workshop; DAL/NWH 29

30 Conclusions & Recommendations - cont Prog 1 had consistently the worse accuracy and dramatically over-estimated MPL Prog 1 & 3 have provided all the load and nondimensional pumping parameters while prog 2 still is missing N/No While there were instances where there was a negative MPL, these loads did not increase nor stay applied over the plunger stroke length Sucker Rod Pumping Workshop; DAL/NWH 30

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33 Sucker Rod Pumping Workshop; DAL/NWH 33