Method and equipment for determining the contribution rate of flowback fluid in fractures of different scales in shale gas fracturing wells

Abstract

The embodiment of the present invention provides a method and equipment for determining the contribution rate of flowback fluid in fractures of different scales in shale gas fracturing wells. The method includes: establishing a water-gas two-phase flow equation for hydraulic main fractures and a water-gas two-phase flow equation for secondary fractures , the water-gas two-phase flow equation of natural fractures and the water-gas two-phase flow equation of the matrix; and set the initial condition equations, boundary condition equations and auxiliary equations of hydraulic main fractures, secondary fractures, natural fractures and matrix, the whole well, Flowback fluid volume equations of hydraulic main fractures, secondary fractures, and natural fractures; then solve the flowback parameters according to the equations; finally, according to the flowback parameters of the whole well, flowback parameters The flowback parameters of fractures can be determined to determine the contribution rate of hydraulic main fracture flowback fluid, secondary fracture flowback fluid contribution rate and natural fracture flowback fluid contribution rate, which can accurately reflect the influence of different scale fracture flowback fluid on the flowback fluid volume of the whole well. It can provide an important reference for actual fracturing construction.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of oil and gas field development, and in particular to a method and equipment for determining the contribution rate of flowback fluid in fractures of different scales in shale gas fracturing wells. Background technique [0002] With the development of unconventional oil and gas resources, shale gas has become an important part of the current development of oil and gas resources. Shale reservoirs are characterized by low porosity, low permeability, developed natural fractures and high capillary pressure. The experience of large-scale development of shale gas fields shows that the key technology to realize the industrial exploitation of shale gas lies in large-scale volume fracturing technology. After fracturing, a complex fracture network is formed in the reservoir as a channel for shale gas exploitation. During construction, in order to reduce the damage of fracturing fluid to the ...

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Problems solved by technology

[0004] The embodiment of the present invention provides a method and equipment for determining the contribution rate of flowback fluid in fractures of different scales in shale gas fracturing wells, so as to solve the problem that in the prior art, the data collection and analysis of the volume of flowback fluid in macroscopic wells cannot reflect different scales The impact of fracture flowback fluid on the volume of flowback fluid in the whole well cannot provide an important reference for actual fracturing operations

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