Method for calculating tight reservoir fracturing transformation volume area

Abstract

The invention discloses a method for calculating a tight reservoir fracturing transformation volume area. The method comprises the following steps that multiple hydraulic fracture non-planar turning extension models, a formation stress field change model, a reservoir pressure file change model and a natural fracture failure criterion in the tight reservoir horizontal well fracturing process are established, geological parameters, horizontal well fracturing construction parameters and the total fracturing time are obtained, an initial fracture filter loss value, an initial fracture half-length value, an initial in-fracture pressure value, an initial fracture extension turning angle, initial permeability and an initial fracturing time value are endowed, all the models are calculated, and natural fracture failure point coordinate data is calculated; a spatial and numerical integration method is utilized to calculate tension failure transformation area volume and shear failure transformation area volume in a reservoir respectively, and the spaces of the two parts are united and regarded as a total transformation volume area. By adopting the method, accurate, economic and rapid tight reservoir horizontal well fracturing evaluation can be achieved, and the problem that effort, money and time are wasted in the existing tight reservoir horizontal well fracturing transformation volume area calculating process is solved.

Description

technical field [0001] The invention belongs to the field of tight oil and gas reservoir development, and in particular relates to a calculation method for the fracturing reconstruction volume area of ​​tight reservoirs. Background technique [0002] The porosity of tight oil and gas reservoirs is small, usually less than 10%; the matrix permeability is extremely low, usually less than 1mD, which is very unfavorable to the flow and migration of oil and gas. If no measures to increase production are taken, there is almost no commercial development value. However, tight oil and gas reservoirs usually have a large number of natural fractures. Although these natural fractures are not activated and closed under the original formation conditions, they can be stimulated by staged cluster fracturing by drilling horizontal wells and using large fluid volume and displacement. With the extension of multiple hydraulic fractures and the large amount of fracturing fluid leaking into the ...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a horizontal well hydraulic system for tight reservoirs that solves the time-consuming, laborious and costly calculation process of the volume of the stimulated area during the fracturing of the existing tight reservoirs, and the evaluation of the volume of the fractured area cannot be widely applied. Calculation method of fracture reconstruction volume

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