Evaluation Method of Water-flood Stimulation Effect of Horizontal Wells in Tight Oil Reservoirs

doi:10.3969/j.issn.1006-6535.2022.02.013

Abstract

Abstract: In view of poor water-flood stimulation effect in tight reservoirs, the reservoir engineering method was applied, taking into account the geological characteristics, fracturing technologies and water-flood stimulation system, to quantitatively characterize the degree of development of the complex fracture network formed by natural and fractured fractures in tight reservoirs based on the fracture fluid flowback rate and fracturing stimulation multiplier, and to work out a method for calculating the fracture network development coefficient. The nine-scale method was used to establish weight set of evaluation indicators for fuzzy calculation and type identification. The study results were applied to the evaluation of water-flood stimulation effect in Block M, Santanghu Basin, 10 evaluation indicators were established, and the value of each evaluation indicator were divided into three categories, and the value limit of each category were determined. The results showed that the proportion of Class I wells was 45.1%, and the accuracy rate was 86.21% compared with actual production. This study on development effect evaluation provides a reference for water-flood stimulation in tight reservoirs.

Key words: tight oil reservoir, water-flood stimulation, evaluation method, horizontal well, net inflow of fracturing fluid into ground, effective water injection rate, oil-water replacement rate

CLC Number:

TE341

Di Shiying, Cheng Shiqing, Dai Li, Li Wangdong, Miao Li′nan, Liu Qi. Evaluation Method of Water-flood Stimulation Effect of Horizontal Wells in Tight Oil Reservoirs[J]. Special Oil & Gas Reservoirs, 2022, 29(2): 91-97.

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