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Significant New “Learings” From An Integrated Study Of An Old Field, Foster/South Cowden Field (Grayburg & San Andres), Ector County, Texas DE-FC22-93BC14982. Robert C. Trentham, DGS Center for Energy and Economic Diversification University of Texas of the Permian Basin. Project Results.

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Presentation Transcript
slide1

Significant New “Learings” From An Integrated Study Of An Old Field, Foster/South Cowden Field (Grayburg & San Andres), Ector County, TexasDE-FC22-93BC14982

Robert C. Trentham, DGS

Center for Energy and Economic Diversification

University of Texas of the Permian Basin

project results
Project Results
  • 290,000 BO Incremental Production 1996 to present
  • >650,000 BO Incremental Reserves
  • 3 Re-entries
  • 4 New Drills
  • >12 Workovers
  • Economic life of field extended from 9 to 16 years
  • Sold to Oxy for well above decline curve price.
learnings came in all areas
“Learnings” Came in All Areas
  • Reservoir Characterization
  • Well Testing
  • Recompletions
  • Production
type log
Queen

Upper Grayburg –Main Pay

Lower Grayburg – Minor Pay

San Andres – Large OOIP

Type Log
integated study
GEOLOGICAL MODEL

3D SEISMIC / INVERSION MODELING

FLOW MODELING

HISTORY MATCH

SIMULATION

TESTING, WELL WORK, MONITORING

OLD WATERFLOOD

CROSS FLOW BETWEEN ZONES

NO FRACTURE STIMULATIONS

BHP DISCREPANCIES

LOW PERMEABILLLTY

WHERE DID THE WATER GO?

OPEN HOLES / CASED HOLES

INTEGATED STUDY

Problems

Solutions

slide9

Discovered 1939

40 Acre spacing

Nitro Open Holes

Waterflood 1962

20 Acres 1979

Laguna 1992

DOE 1994

Oxy 2002

reservoir characterization
Reservoir Characterization
  • San Andres Reservoir – Over Estimates and Under Achievement
  • Barriers to vertical flow
  • Inversion Modeling to porosity maps
  • Seismic Velocity related to Neutron Density Porosity
porosity inversion vs log
Porosity - Inversion vs. log

Seismic Inversion

Well Log

well testing
Well Testing
  • Water Chemistry
    • Inefficient sweep
    • Backup for well testing & workover results
  • Bottom Hole Pressure Test results
    • Complex layering of reservoir
    • Cross flow
    • Low permeability = Longer test duration
  • Production tests
    • 3 day minimum
slide16

HC03

S04

CL

CA

MG

NA

TDS

UPPER GRAYBURG

170

2990

13500

1530

450

7750

26390

LOWER GRAYBURG

386

2632

20295

1889

664

11245

37332

SAN ANDRES

980

3881

33846

2507

762

19855

61831

INJECTION WATER

793

3100

32000

2646

947

17757

57244

CANYON

329

1104

76532

5880

692

42193

126693

ELLENBURGER

439

1459

63917

3840

972

36064

106691

wells in the same section
Wells in the same ¼ section

2124 #

544 #

1534 #

955 #

recompletions workovers
Recompletions/Workovers
  • 1955 to 1982 Fracture Stimulation are closed, healed or scaled over
  • Acid Stimulations unsuccessful in contacting reservoir
  • Success rate can be estimated and candidates ranked by Bottom Hole Pressure, Water Chemistry and Production Tests
production
Production
  • Outcome of fracture stimulation is proportional to bottom hole pressure and Oil/Water production rates prior to treatment
  • Flowing water recoveries do not condemn a well. Some wells produce many times load and have to have fluid level drop below 1000’ from surface before producing OIL!
ucce ful project
$ucce$$ful Project?

PRODUCTION BEFORE WELL WORK (UPPER GRAYBURG ONLY) 37 BO, 9 MCF, 181 BW

INITIAL PRODUCTION AFTER WORK 467 BO, 145 MCF, 3167 BW

CURRENT PRODUCTION RATE 280 BO, 65 MCF, 2323 BW

acknowledgements
Acknowledgements
  • Dick Weinbrandt
  • Bill Robinson
  • DOE Tulsa office
  • The Staff of Laguna Petroleum
  • Baker-Hughes (previously Scientific Software Intercorp)
  • Paul Laverty
  • Jim Reeves and Hoxie Smith who conceived and managed the project thru phase I
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