Integral Potential Exploitation Technology in Fault Zone of High Water-Cut Oilfield-Taking DQSB in Daqing Oilfield as an Example

Abstract

Old oilfields in eastern China have generally entered the stage of high water cut, and it is increasingly difficult to tap their potential . At present, there are still three problems in excavating potential of remaining oil in old oilfields: low accuracy of description of small faults, unclear understanding of potential of fault edge and the means of tapping the remaining oil in fault area are limit, which restrict accurate tapping potential. Taking DQSB development area of Daqing Oilfield as an example, the paper proposes to use well and seismic data to cooperate with genetic analysis to realize fine characterization of various faults. Through the analysis of fault genesis and the elongation of fault spacing below 5 m, the fine interpretation of fault points is realized. On the basis of the fine understanding of fault location, the causes of residual oil at fault edge are identified by reservoir engineering method from three aspects of structure, reservoir and well pattern. Then, according to the law of residual oil enrichment, three models of overall tapping potential in fault area are put forward and optimized. Drilling well type, measures and other means to improve the relationship between injection and production in fault areas, realizing the efficient tapping of remaining oil potential. After implementation, the average daily oil increase of single well in fault area is more than 7 times that of the surrounding old wells, and the development benefit is obvious, thus forming a set of integrated potential tapping mode in fault area.