Ventura Field Rod Well Systems

Transcription

1 5 th Annual Sucker Rod Pumping Workshop Wyndham Hotel - Dallas, Texas September 15 18, 2009 Ventura Field Rod Well Systems System overview & observations Steve Hirshblond Technical Consultant Aera Energy LLC Aera Energy LLC 2009

2 Topics for Discussion... Brief overview/history lesson Rod well system data snapshot Observations 2009 Sucker Rod Pumping Workshop 2

3 Ventura Field General On production since early 1900 s Consolidated sandstone sequences ,000 depths ( oil column) Long completion intervals ( ) API, 30-95%+ watercut < B/D gross fluid well rates Most reservoirs actively waterflooded Deviated wells (near vertical -> 60 0 ; but crooked!) High drawdown requirements -> efficient lift systems 2009 Sucker Rod Pumping Workshop 3

4 Ventura Rod Systems - Historical Late 1960 s/early 80 s (Initiation of waterflooding) Increasing lift capacity requirements Rod lift to ~8500 (gaslift, hydraulic,++ deeper) 2-7/8 anchored tubulars, API 86 jointed rod tapers Conventional pumping units (largely ~912 s & smaller) QA/QC on rod handling, materials Development of wave-equation design tools, mobile analysis Pump-off control technology Focus maximize production 2009 Sucker Rod Pumping Workshop 4

5 Ventura Rod Systems - Historical Late 1980 s/early 90 s Elimination of the central (Taylor) gaslift system Converted most wells to rod/esp lift Rod lift system optimization Begin moving to larger pumping units, airbalance prevalent Implications of deeper pumping (loads, rates, chemical treating) Expansion of POC/monitoring technologies Development of wave-equation design tools, mobile analysis Pump-off control technology Focus maximize production 2009 Sucker Rod Pumping Workshop 5

6 Ventura Rod Systems - Historical Mid 1990 s to present Continued upsizing of surface equipment Introduced rod/tubing rotators Introduced continuous sucker rod Rod guides Central/remote monitoring & control Variable speed controllers Focus shift to operating costs/reliability 2009 Sucker Rod Pumping Workshop 6

7 Data snapshot summary Individual well data of April 2008 ~300 total rod wells in sample All load/production data is actual (uncorrected) Conventional & Airbalanced Systems 100 lled count Insta Gearbox Rating 2009 Sucker Rod Pumping Workshop 7

8 800 Gross Rate vs. Depth (9-April-08 data) Gross Rate (B/D) Pump Depth (ft) Log. (320) Log. (456) Log. (640) Log. (912) Log. (1280) Log. (1824) Log. (2560) 2009 Sucker Rod Pumping Workshop 8

9 Pumping Fluid Level vs. Mid-perf Depth (9-April-08 data) 0 Mid-perf depth (ft) (ft) Pumping fluid level Sucker Rod Pumping Workshop 9

10 3 Pump Bore vs. Depth (9-April-08 data) 2.5 Pump Bore (in) Pump Depth (ft) 2009 Sucker Rod Pumping Workshop 10

11 Pump Bore vs. Unit Speed (9-Apr-08 data) 3 Pump bo ore (in) Unit speed (SPM) 2009 Sucker Rod Pumping Workshop 11

12 300 Gearbox Rating vs. Actual Stroke Length (9-April-08 data) Actual Surfa ace Stroke (in) Gearbox Rating (Min-lbs) 2009 Sucker Rod Pumping Workshop 12

13 14 12 Gearbox Rating vs. Speed (9-April-08 data) Speed (SPM) Gearbox Rating (Min-lbs) 2009 Sucker Rod Pumping Workshop 13

14 Unit System Loading (9-Apr-08 data) 100 Peak Loading (%) Pump Depth (ft) Gearbox St ructure Rods Log. (Gearbox) Log. (Rods) Log. (Structure) 2009 Sucker Rod Pumping Workshop 14

15 Unit System Loading (9-April-08 data) 100 Loading (%) Peak Pump Depth (ft) Gearbox Structure Rods Log. (Gearbox) Log. (St ruct ure) Log. (Rods) 2009 Sucker Rod Pumping Workshop 15

16 Unit System Loading (9-April-08 data) 100 Peak Loading (%) Pump Depth (ft) Gearbox Structure Rods Log. (Gearbox) Log. (Structure) Log. (Rods) 2009 Sucker Rod Pumping Workshop 16

17 Unit System Loading (9-Apr-08 data) 100 Peak lo oading (%) Pump Depth (ft) Gearbox Structure Rods Log. (Gearbox) Log. (Structure) Log. (Rods) 2009 Sucker Rod Pumping Workshop 17

18 Ventura Rod Systems - Observations General Challenging lift environment Deep, deviated, high relative rates & drawdown Scale/solids/wax/asphaltines/corrosion/wear Excellent use of available technology Dedicated organization focused on reliability Multiple downhole failure modes Dominated by wear, solids, & corrosion 2009 Sucker Rod Pumping Workshop 18

19 Ventura Rod Systems - Observations Design/Configuration Large data scatter Loads unbalanced between system components Optimization potential Larger pump p bores, slower speeds, longer stroke... Conscious choice in effort to improve reliability Increased DH stroke suppression Large fluid transfer loads, tubing movement (anchored high) Interpretation & modeling of deviation surveys an issue 2009 Sucker Rod Pumping Workshop 19

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