Method for optimizing fracture conductivity of tight gas-reservoir fractured horizontal well

A conductivity, horizontal well technology, applied in the field of fracturing stimulation

Active Publication Date: 2015-05-06
SOUTHWEST PETROLEUM UNIV
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  • Abstract
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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, 20

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  • Method for optimizing fracture conductivity of tight gas-reservoir fractured horizontal well
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  • Method for optimizing fracture conductivity of tight gas-reservoir fractured horizontal well

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Embodiment Construction

[0076] Below further illustrates how to utilize the present invention to realize the optimization design method of the fracture conductivity of a certain tight gas reservoir fracturing horizontal well, specifically as follows:

[0077] The basic parameters of reservoir, fluid and fracture of a formation to be fractured are as follows:

[0078] The burial depth of a horizontal well in a tight gas reservoir is 2800m, the length of the horizontal section is 500m, the effective thickness is 25m, the porosity is 12.0%, and the permeability is 0.75×10 -3 μm 2 , the gas layer temperature is 68°C, the gas viscosity is 0.035mPa·s, the gas deviation factor is 0.89, the gas critical pressure is 4.64MPa, and the gas critical temperature is 88°C; the comprehensive compressibility coefficient of the formation is 3.5×10-4 MPa -1 , the formation pressure is 30MPa, and the bottomhole flowing pressure is 25MPa. Four fractures were formed evenly along the wellbore of the horizontal well, the f...

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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...

Claims

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Application Information

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IPC IPC(8): E21B43/267G06F17/50
CPCE21B41/0092E21B43/26
Inventor 曾凡辉郭建春龙川蒋豪
Owner SOUTHWEST PETROLEUM UNIV
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