Analysis on Contribution to Productivity of SRV-fractured Horizontal Wells in Tight Reservoirs Based on Simulation of Fracture Network Propagation

doi:10.3969/j.issn.1006-6535.2021.02.019

Abstract

Abstract: On account of difficulties in prediction of fracture network propagation caused by stimulated reservoir volume (SRV) fracturing and in simulation of coupled flow in multi-pore media in tight reservoirs, a study was conducted on fluid flow rules in tight reservoirs based on fracture propagation mechanism with SRV fracturing, a mathematical model for transient seepage flow in multiple media and a propagation model for fracture network produced by fracturing under mutual interference of multiple fractures were established, and finite element method was used for solving. A production simulation was performed based on a case study of tight oil in the Ordos Basin to analyze the contribution of different pore media to the productivity of SRV-fractured horizontal wells in tight oil reservoirs. The findings show that if the spacing of SRV-fractured horizontal well clusters is shortened, the hydraulic fracture propagation length is shorter, the average belt length is decreased, the stimulated area first is decreased and then tends to be stable, and the average belt width and fracture width first are increased and then tend to be stable; the construction to productivity of SRV-fractured horizontal well is dominated by natural and and hydraulic fractures, and the matrix has little contribution to productivity. The results of the study provide a theoretical foundation for fracture propagation simulation and productivity prediction of fractured horizontal wells in tight reservoirs.

Key words: tight reservoirs, SRV fracturing, horizontal wells, fracture propagation, contribution to productivity

CLC Number:

TE341

Mu Lijun, Wu Shunlin, Xu Chuangchao, Su Yuliang, Ren Long. Analysis on Contribution to Productivity of SRV-fractured Horizontal Wells in Tight Reservoirs Based on Simulation of Fracture Network Propagation[J]. Special Oil & Gas Reservoirs, 2021, 28(2): 126-132.

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