Study on Staged Optimization Method of Staged Fracturing for Horizontal Wells in Low-permeability Gas Reservoir

doi:10.3969/j.issn.1006-6535.2021.01.018

Abstract

Abstract: The staged fracturing in horizontal wells has become an important method for efficient development of low-permeability gas reservoirs. In view of the poor fracturing effect caused by high reservoir heterogeneity and complex distribution of natural fractures, the four-dimensional imaging technology for monitoring fractures was used to establish a weak stress identification method based on logging curve, the weak-stress development evaluation parameter K_tr was introduced and combined with the reservoir development characteristics of horizontal well to optimize the staged parameters, so as to fully stimulate the section with weak stress. The study results show that in the well section higher than the cutoff value of K_tr, the number of fractures detected by four-dimensional imaging was more than the design value, and the productivity after fracturing was higher than the average level. Therefore, the K_tr value can be used to optimize the staged fracturing interval of horizontal wells in combination with the reservoir development characteristics of the well section and to improve the effect of fracturing and stimulation. It plays an important role in improving the fracturing section division method of low-permeability gas reservoirs and improving the efficiency of stimulation and recovery.

Key words: low-permeability gas reservoir, horizontal well, staged fracturing, drilling time, natural fracture, optimization method

CLC Number:

TE348

Yang Hao, Li Xinfa, Chen Xin, Chen Xiaoyi, Liu Peng, Feng Qing, Geng Shaoyang. Study on Staged Optimization Method of Staged Fracturing for Horizontal Wells in Low-permeability Gas Reservoir[J]. Special Oil & Gas Reservoirs, 2021, 28(1): 125-129.

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