Modeling method for threaded joint of oil casing

Abstract

The invention relates to a modeling method for a threaded joint of an oil casing, which includes the following steps of acquiring initial geometric parameters of an outer thread of the joint; acquiring parameters of an auxiliary surface of an outer thread of the joint; obtaining an outer thread geometric model of the joint according to the initial geometric parameters and the parameters of the auxiliary surface of the outer thread; acquiring initial geometric parameters of an inner thread of the joint; acquiring parameters of the auxiliary surface of the inner thread of the joint; obtaining the inner thread geometric model of the joint according to the initial geometric parameters and the parameters of the auxiliary surface of the inner thread; combining the outer thread geometric model with the inner thread geometric model to form joint parameters so as to form a joint geometric model by programs automatically; and meshing the joint geometric model to obtain a finite element model. After required parameters are given, the finite element software establishes geometric models and material models automatically according to the requirements, wherein the geometric models and the materials models can be divided into finite element grid models automatically. Besides, automatic design analysis and reliability analysis of the joint of the oil casing can be realized.

Description

technical field [0001] The invention relates to a modeling method for an oil-casing threaded joint. Background technique [0002] The oil and casing used in the oil industry is a necessary equipment in the development of oil and natural gas exploration, and is connected into a pipe string in the downhole by using threaded joints. In the design process of oil-casing joints, joint modeling and grid division are often carried out, and the modeling process is the most laborious and critical step in finite element simulation. In the process of finite element analysis of oil-casing threaded joints, the thread structure is still modeled manually due to the complex shape changes. Since the current technology fails to realize the automatic modeling of the finite element analysis process, every time the shape or size of the thread or air-tight structure of the joint is changed, it must be manually modeled again, which is laborious and laborious. And the artificial modeling method ca...

AI Technical Summary

Problems solved by technology

Since the current technology fails to realize the automatic modeling of the finite element analysis process, every time the shape or size of the thread or air-tight structure of the joint is changed, it must be re-modeled manually, which is laborious and laborious

And the artificial modeling method cannot be applied to the reliability analysis of the joint performance under the condition of variable parameters by the Monte Carlo method, or the optimal design

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