Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (5): 162-170.doi: 10.12108/yxyqc.20220514

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles    

Oil production contribution evaluation method of gas/water drive in gas-cap and edge-water reservoirs

MENG Zhiqiang, GE Lizhen, ZHU Xiaolin, WANG Yongping, ZHU Zhiqiang   

  1. Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
  • Received:2022-02-15 Revised:2022-06-01 Online:2022-09-01 Published:2022-09-06

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Abstract: Based on the study of oil-gas and oil-water two-phase seepage law in S31 reservoir of Jinzhou oilfield, combined with the material balance equation,the oil production contribution evaluation method of oil of gas/water drive was derived and established,and the contribution of gas drive and water drive in the cumulative oil production of this kind of reservoir was quantified,which lays a foundation for the evaluation of recoverable reserves and development effects of gas-cap and edge-water reservoirs. The results show that:(1)The horizontal well pattern divides the gas-cap and edge-water reservoirs into two parts,the gas-cap gas drive and the edge-water drive, and the recoverable reserves and development effects can be evaluated respectively.(2)The evaluation method reflects the relationships of the oil production contributed by gas/water drive with the production gas-oil ratio and water cut. The cumulative oil production contributed by gas drive and water drive can be calculated by using the production performance data.(3)Using the cumulative oil production contributed by gas drive and water drive and production performance data,combined with the gas drive and water drive characteristic curves,and development effect evaluation chart,the recoverable reserves and development effects of gas-cap and edge-water reservoirs can be evaluated,so as to point out the direction for next potential tapping of the oilfield.

Key words: gas drive, water drive, contribution to oil production, recoverable reserves forecast, development effect evaluation, potential tapping, gas-cap and edge-water reservoir, S31 reservoir, Jinzhou oilfield

CLC Number: 

  • TE341
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