Unconventional oil and gas reservoir horizontal well fracturing elastic piece tool structure optimization method

Abstract

The invention discloses an unconventional oil and gas reservoir horizontal well fracturing elastic piece tool structure optimization method. A six-factor five-level orthogonal test is designed, six factors comprise a chamfering radius, a protruding thickness, a protruding length, an elastic piece thickness, a protruding angle and an elastic piece petal number, and an investigation index is an elastic piece maximum equivalent stress; each finite element model is simplified, one section of the elastic sheet is taken as the finite element model, and simulation data of each model is extracted; and the obtained experiment data is filled into an orthogonal table to obtain an orthogonal experiment result, range analysis is performed on the experimental result, and first optimization is performed on the elastic sheet. On the basis of the orthogonal experiment optimization result, single-factor experiment analysis is carried out on each size parameter, and the structure of the elastic sheet is optimized for the second time. Finite element software is combined with an orthogonal experimental design principle and a single-factor experimental analysis principle to optimize an elastic sheet tool structure, the method is simple, the result is scientific and reliable, and the method has reliable guiding significance on elastic sheet structure optimization.

Description

technical field [0001] The invention relates to a method for optimizing the structure of a shrapnel tool for fracturing a horizontal well in an unconventional oil and gas reservoir. Background technique [0002] The staged fracturing technology of horizontal well open hole completion can significantly improve the productivity of unconventional oil and gas reservoirs. The optimal structure of downhole tools is the basic guarantee for the effective implementation of staged fracturing in open hole completion of horizontal wells. With the increase of unconventional oil and gas reservoir operations, the operating conditions will also tend to be diversified and complicated, which brings higher challenges to the structure and technology of downhole fracturing tools. Carry out mechanical analysis and structural optimization design to meet the requirements of horizontal well open hole completion technology. [0003] Using commercial finite element software to conduct simulation exp...

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Problems solved by technology

[0005] The main size parameters of the shrapnel are: chamfer radius, protruding length, protruding thickness, shrapnel thickness, protruding angle, and number of shrapnel petals. The values ​​of these six main parameters play a vital role in the overall strength of the shrapnel, and each There are also interaction factors among the parameters. If according to the requirements of the comprehensive experiment, five levels of experiments are taken for each inch parameter, it is necessary to carry out 5 6 = 15625 groups of experiments, huge workload

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