Author:
Yugui Liu
Affiliation:
No.6 Oil Production Factory,Daqing Oilfield Limited Company andDaqing, China
Keyword(s):
Efficiency of water injection, storage ratio of injected water, water consumption ratio, water drive index
Abstract:
Eastern D pure oil zone has entered the phase of extra high water cut. In order to reduce the decline rate, control rising speed of water cut, study on the efficiency of water injection and reasonable injection and production rate for target block, in this way determine limit of controlling water injection and increasing efficiency, and increase the efficiency of water injection. This paper makes a technical evaluation of the water injection efficiency of the target block from the storage ratio of injected water, water consumption ratio, and water drive index. The relationship curve of storage ratio of injected water versus degree of reserve recovery in the east of D pure oil zone compares with theoretical diagram, and the work of controlling water injection such as water plugging is suggested to strengthen. The relationship curve of water consumption ratio versus degree of reserve recovery in the target zone compares with theoretical diagram, the water injection utilization ratio of
the zone in recent years is poor, which belong to three types of level. In order to increase the efficiency of water injection, adjustment measures are urgent needed. The real relationship curve of water drive index versus water cut in the target zone compares with theoretical diagram, it is confirmed that the development effect is better in early stage of development, exist a underground deficit phenomenon in middle stage of development and water drive index could not be used to evaluate the development effect of water flooding in later stage of development.
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