Optimization design method for oil casing screwed-joint sealing structure

A sealing structure and threaded joint technology, which is applied in the field of drilling, can solve the problems that the sealing structure cannot be guaranteed, and the structural optimization design method has not been adopted, so as to achieve the effect of improving the sealing ability

Active Publication Date: 2015-04-29
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] The main problems in the existing technology: 1) The sealing structure cannot be guaranteed to be the best design parameter combination that meets the requirements of certain working conditions; 2) The effective structure optimization design method is not adopted to design the sealing structure of special threaded joints

Method used

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  • Optimization design method for oil casing screwed-joint sealing structure
  • Optimization design method for oil casing screwed-joint sealing structure

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Embodiment 1

[0048] Taking the threaded joint with the cylindrical / spherical main seal structure as an example, the sealing performance of the threaded casing joint is closely related to its own structural form and the interference of the sealing surface. The contact pressure distribution on the sealing surface directly determines the joint performance. Sealing performance; selection based on the existing cylindrical / spherical main seal structure of common threaded joints And P110 steel grade threaded casing joint, the main seal adopts cylindrical / spherical metal / metal seal structure, the shoulder surface adopts -15°torque shoulder structure, and the thread part adopts API 5B standard partial trapezoidal thread, 5 threads per inch; The hoop length is 255mm, and the geometric model is established by selecting the length of the pipe body to be greater than 3 times the length of the threaded end to eliminate the influence of boundary factors; the casing material model is a dynamic strengtheni...

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Abstract

The invention discloses an optimization design method for an oil casing screwed-joint sealing structure. The optimization design method includes the following steps: 1), creating a parameterized geometric model of the special screwed-joint sealing structure; 2), creating a parameterized finite element model of the special screwed-joint sealing structure; 3), solving the finite element model, determining three optimization design elements, and creating an optimized mathematical model of the sealing structure; 4), performing design of experiments (DOE) on the optimized model, determining optimization solution settings, and solving the optimized model on experiment samples; 5), performing sensitivity analysis on design variables, and fitting a response surface model of sealing performance on experiment sample points; 6) selecting a proper optimization algorithm to perform iteration solution according to the response model; 7), modifying the sealing structure according to a solution result to acquire a structural optimization design result. The optimization design method has the advantages that a structural optimization design philosophy and a finite element analysis method are adopted, and accordingly, optimal design parameter combinations capable of meeting requirements of various working conditions can be achieved.

Description

technical field [0001] The invention belongs to the technical field of drilling, and relates to an optimization method, in particular to an optimization design method for a sealing structure of an oil-casing threaded joint. Background technique [0002] As the oil and gas development environment becomes more and more complex, more stringent requirements are put forward for the connection strength and sealing performance of the oil casing. The threaded joint is the weakest link in the oil casing, which directly affects the life of the oil and gas well. According to statistics, more than 80% of casing failure accidents occur at threaded joints, so improving the connection quality of casing threads is an effective measure to prevent failure. Ordinary API threaded joints have inherent structural design defects, and cannot meet the demanding work requirements in terms of connection strength and sealing performance. At present, many oil and gas fields have begun to use a large n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 王建军朱强李方坡王建东
Owner BC P INC CHINA NAT PETROLEUM CORP
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