Multi-objective design method and device of drilling perforating casing based on multi-objective optimization

Abstract

The invention provides a multi-objective design method and device of a drilling perforating casing based on multi-objective optimization. The multi-objective design method includes the steps that parameters of a finite element parametric model of a perforating casing are initialized; stress analysis is performed on the finite element parametric model according to preset optimization objectives, constraint conditions and an optimization range of the parameters, and an analysis result and a corresponding parameter solution set are determined, wherein the analysis result at least includes a casing stress value and a casing drift diameter value, and the parameter solution set at least includes the nominal outside diameter of the casing and the like, the perforation hole size and the like, andelastic modulus and the poisson ratio of a cement ring; and whether the casing stress value and the casing drift diameter value meet the constraint conditions or not is judged, and if yes, it is determined that the parameter solution set corresponding to the analysis result is the optimal solution set. The multi-objective design method and device are applied to the optimized design of the development well perforating casing, and meet the requirements of casing design and perforation design in different complex formations; and the multi-objective design method and device include optimization ofa casing thickness and steel grade, the maximum oil passing area and the minimum sand production of formations, and oil and gas production is improved.

Description

technical field [0001] The invention relates to the technical field of drilling and perforation casing optimization design, in particular to a multi-objective design method and device for drilling and perforation casing based on multi-objective optimization. Background technique [0002] Perforation is an important well completion technology, which can significantly improve the production and injection effects of oil and gas fields. But perforation alters the integrity of the casing string, reducing its crush strength. Under the joint effect of in-situ stress and downhole dynamic load during injection-production process, stress concentration occurs around the hole, which is prone to failure and failure. Perforation is one of the important factors leading to casing damage. Due to the complex and diverse stratum structure, the failure mode of the casing is also complicated. The statistics of several oil production plants in Zhongyuan Oilfield show that the casing damaged we...

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Problems solved by technology

[0004] In order to solve the problem that the traditional perforated casing single-objective optimization design method is difficult to fully meet the complex well design and analysis requirements, the embodiment of the present invention provides a multi-objective design method for drilling and perforated casing based on multi-objective optimization. The method includes :

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