Non-uniform and complex fracture parameter inversion method and equipment for multi-stage fractured horizontal wells

Abstract

The present invention provides a non-uniform and complex fracture parameter inversion method and equipment for multi-stage fracturing horizontal wells. The method includes: obtaining the liquid drainage rate of each fracture, according to the wellhead pressure data, and calculating the opening of each fracture according to a preset method The flow pressure of each fracture is generated to generate a double-logarithmic flow characteristic curve corresponding to the flowback volume and pressure; the target parameters of the main fracture and the secondary fracture are adjusted until the fitting flow pressure of each fracture and the history curve of fluid production in the flowback stage When the fitting effect of the logarithmic and logarithmic flow regime characteristic curves is the best with the original flow pressure of each fracture segment, the liquid production history curve in the flowback stage and the log-logarithmic flow regime characteristic curve, the adjusted main fracture segment is determined. Fracture parameters and secondary fracture parameters are the inversion parameters of non-uniform complex fractures in multi-stage fracturing horizontal wells. Since the inversion is carried out according to the fracture segment, the inversion parameters are close to the actual fracture conditions; and the complex fractures are completed through the parameters of the flowback stage. Parameter inversion to solve the hysteresis problem of RTA analysis.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of oil and gas field development, in particular to a method and equipment for inverting parameters of non-uniform and complex fractures in multi-stage fracturing horizontal wells. Background technique [0002] With the development of unconventional oil and gas resources, tight oil and gas and shale oil and gas have become an important part of the current development of oil and gas resources. The key to realizing large-scale industrial exploitation of unconventional oil and gas resources of tight oil and gas and shale oil and gas lies in the multi-stage fracturing technology of horizontal wells to invert the fracture parameters of horizontal wells, which is an important means to evaluate the stimulation effect of fracturing. [0003] At present, the traditional inversion method of fracture parameters for horizontal wells is the rate transient analysis (RTA) method based on long-term ...

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Problems solved by technology

[0005] The embodiment of the present invention provides a non-uniform and complex fracture parameter inversion method and equipment for multi-stage fracturing horizontal wells to overcome the characteristics of the different fluid and sand volumes pumped into the fractures at each level and the heterogeneity of the reservoir , so that the actual fracture parameters at all levels are not the same, leading to the problem of error between the uniform fracture parameters obtained by RTA method inversion and the actual non-uniform fracture; at the same time, it solves the hysteresis problem of complex fracture parameter inversion by RTA analysis method

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