Transient Pressure Analysis of Vertical Well with Multi-wing Fractures

doi:10.11885/j.issn.1674-5086.2021.04.12.02

Abstract

Abstract: The complex fracture network formed by hydraulic fracturing destroys the flow characteristics of a single linear fracture, which brings great challenges to the dynamic prediction of oil wells. In order to study the transient pressure characteristics of vertical wells with multi-wing fractures, the reservoir system is divided into two subsystems based on the source function theory and the superposition principle, and a semi-analytical model of transient pressure analysis is established using the discrete coordinate method. The identification curves of each flow stage in the reservoir are drawn by Laplace transform and Stehfest inversion algorithm. On this basis, the sensitivity analysis of the complex fracture network is carried out by changing the parameters such as the number of fractures, the length of the fracture, the angle of the fracture, the fracture distribution form and the fracture conductivity. The research results show that the reservoir flow in vertical wells with multi-wing fractures has gone through 4 stages. Among them, the number and length of fractures have a greater impact on the linear flow in the reservoir; the distribution of fractures has a large and complicated influence on the bilinear flow in the reservoir and the linear flow in the formation; the fracture conductivity has obvious influence on the bilinear flow in the reservoir; the fracture angle has little effect on the dynamic pressure characteristics of each flow stage in the reservoir.

Key words: hydraulic fracturing, multi-wing fractures, vertical wells, transient pressure analysis, semi-analytical model

CLC Number:

TE357

ZHANG Shoujiang, QIAO Hongjun, ZHANG Yongfei, CHEN Yiming, ZENG Fanhua. Transient Pressure Analysis of Vertical Well with Multi-wing Fractures[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(5): 137-146.

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