Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (4): 133-140.doi: 10.12108/yxyqc.20190414

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Potential control theory based on configuration unit and remaining oil development effect

TU Yi, WANG Yahui, YAN Zhenghe, GAO Yongming, WEI Qiren   

  1. Shenzhen Branch, CNOOC China Limited, Shenzhen 518067, Guangdong, China
  • Received:2019-02-21 Revised:2019-04-22 Online:2019-07-21 Published:2019-06-21

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Abstract: In order to study the development effect of remaining oil,by synthetically utilizing seismic,geological and dynamic production data,combining "fine anatomy of configuration" with "potential control theory", the dynamic migration law of oil and water was studied based on single sand body configuration unit,and the migration and accumulation law of remaining oil was predicted from the migration direction and time. The model of migration and accumulation regeneration reservoir was established,and the low potential closed area was put forward as the key area for tapping remaining oil potential. Taking Y oilfield as an example,the main reservoir has few and thin interbeds,and sand bodies are distributed in succession,mainly in stacked contacts. About one year after shutdown,the scattered remaining oil migrated and accumulated to the high parts of low well control and low potential energy structures. The interbeds developed in non-main reservoirs were large and thick. Sand bodies were dominated by stacking and lateral overlapping isolated type. The vertical migration of scattered remaining oil was blocked by interbeds,and the migration direction of sand body was affected by rhythm. Lateral contact types between sand bodies determined the accumulation scale of remaining oil. After shutdown for about 3 years,the remaining oil gradually enriched and formed reservoirs in low-potential closed zones of reservoirs. The average daily oil production of well Y1-6 H in low potential closed zone of Z9 non-main reservoir is over 200 m3,water cut is less than 5%,and the production has been stable for four years. The average daily oil production of well Y1-3 H in high structural position is less than 60 m3,and water cut is about 75%. Now it has been shut down,its production effect is much lower than that of low potential closed zone. The remaining oil of other non-main reservoirs in low potential closed zone has also achieved good potential tapping effect. Potential tapping data prove the rationality of "dynamic migration and accumulation regeneration reservoir model" in low potential closed zone,which can provide technical support for remaining oil tapping in old offshore oilfields in the middle and later stages.

Key words: configuration interface, potential control theory, migration direction, migration time, accumulation law, potential tapping effect

CLC Number: 

  • P618.13
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