Horizontal well close cutting fracturing crack propagation prediction and design parameter optimization method

Abstract

The invention discloses a horizontal well close cutting fracturing crack propagation prediction and design parameter optimization method, and relates to the field of oil and gas yield increasing transformation. The method comprises the following steps of (1) collecting stratum parameters, construction parameters and well completion parameters; (2) establishing a unit numbering rule and a unit connection matrix; (3) establishing a crack propagation rock deformation and in-crack pressure calculation model; (4) establishing a fracturing multi-crack extension step length model; (5) establishing a hydraulic crack and natural crack interaction model; (6) integrating the steps (2)-(5) to establish a close cutting fracture multi-crack extension model of the horizontal well; and (7) substituting the parameters in the step (1) into the model in the step (6), simulating crack extension tracks under different parameter conditions, and optimizing fracturing design parameters. According to the horizontal well close cutting fracturing crack propagation prediction and design parameter optimization method, complex expansion behaviors such as crack bifurcation and intersection can be predicted, the problem of numbering of complex crack units is solved, the vertical crack width is corrected, and accurate simulation of the close cutting fracturing crack multi-fracture expansion track and optimization of design parameters are achieved.

Description

technical field [0001] The invention relates to the field of production stimulation and transformation of oil and gas reservoirs, in particular to a method for predicting and optimizing design parameters of horizontal well dense cutting and fracturing fractures. Background technique [0002] Horizontal well staged multi-cluster fracturing is an important stimulation technology in the field of oil and gas production, and it is also the key to industrialized production of unconventional oil and gas resources. In order to fully "break" the reservoir and release production capacity, the horizontal well density cutting fracturing technology has gradually emerged. Based on the principle of staged multi-cluster fracturing in conventional horizontal wells, the horizontal well density cutting process can greatly reduce the distance between fracture clusters, increase the fracture density in a single stage, and reduce the seepage distance of oil and gas in the reservoir, which can eff...

AI Technical Summary

Problems solved by technology

At present, the optimal design of fracturing parameters is mostly completed by numerical simulation, but most of the existing technologies have not effectively solved the problems of natural fracture influence, inter-fracture stress interference, fracture bifurcation and intersection, complex flow distribution, and composite fluid loss of fracturing fluid. The flow of fracturing fluid in hydraulic fractures is simplified as the flow between smooth plates, ignoring the change of fracture width in the direction of fracture height, so it is impossible to accurately predict the trajectory of fracture propagation in horizontal well density cutting fracturing and reasonably optimize the fracturing design parameters

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