A method for optimizing fracture conductivity of fracturing horizontal wells in tight gas reservoirs

Abstract

The invention relates to fracturing reformation in the field of oil-gas field development, in particular to a method for optimizing fracture conductivity of a tight gas-reservoir fractured horizontal well. The method mainly comprises the following steps of (1) collecting basic parameters of a reservoir, fluid property and a horizontal well shaft; (2) collecting basic parameters of fractures of the fractured horizontal well; (3) evenly dividing each fracture of the fractured horizontal well into line congruence with equal length along the fracture length direction; (4) building a reservoir permeability model for a tight gas-reservoir fractured horizontal well fracture system; (5) building a flowing decompression model of gas in the fractures; (6) building a flowing model of coupled gas in the reservoir permeability and the fractures, and forming a yield calculation model of the tight gas-reservoir fractured horizontal well; (7) optimizing the fracture conductivity of the tight gas reservoir fractured horizontal well. By utilization of the method for optimizing the fracture conductivity of the tight gas-reservoir fractured horizontal well provided by the invention, the shortages of the prior art can be conquered, and the problem of optimizing non-constant fracture conductivity of the fractured horizontal well along the fracture length direction is effectively solved, so that reasonable basis is provided for the optimization design of reservoir reformation, and the reservoir reformation effect is improved.

Description

technical field [0001] The invention relates to fracturing transformation in the field of oil and gas field development, and more specifically relates to a method for optimizing the fracture conductivity of a fracturing horizontal well in a tight gas reservoir. Background technique [0002] Staged fracturing of horizontal wells is an effective measure to develop tight gas reservoirs. Hydraulic fracturing is a method of breaking the formation by injecting high-pressure fluid into the formation when it is greater than the liquid absorption capacity of the formation; then injecting sand mixing fluid containing proppant to promote the further extension of the fracture to the deep part of the reservoir; after the construction is completed, due to the proppant The supporting effect on the fracture wall makes the fracture surface not completely closed but still maintains a certain flow conductivity. These fractures with conductivity ensure the smooth flow of oil and gas in the res...

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Problems solved by technology

[0010] Assuming that the fracture conductivity is constant along the fracture length, the optimization result can only be the average fracture conductivity (Zeng Fanhui, Guo Jianchun, Zhao Jinzhou, et al. Analysis of factors affecting productivity of fractured horizontal wells[J]. Petroleum Exploration and Development. 2007,34(4):474-477; Sun Hai, Yao Jun, Lian Peiqing, et al. An unsteady model for fractured horizontal wells considering bedrock supplying fluid to the wellbore[J]. Acta Petroleum Sinica, 2012, 33(1):117-122; Wang Xiaodong, Zhang Yitang, Liu Ciqun. Optimizing productivity and conductivity of vertically fractured wells [J] Petroleum Exploration and Development, 2004, 31(6):78-81), which is related to tight gas reservoirs During the hydraulic fracturing process of horizontal wells, there are significant differences in the non-constant conductivity distribution along the fracture length direction due to factors such as differences in proppant laying concentrations and fracturing fluid residues.

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