Full-process design optimization method for special screwed joint oil casing for shale gas

Abstract

The invention discloses a full-process design optimization method of a special screwed joint oil casing for shale gas, which mainly comprises the following steps: determining various performance indexes of the special screwed joint oil casing; creating a geometric model and a specific constitutive equation, fully considering material performance attributes and boundary conditions, applying a proper load working condition and making a finite element simulation calculation analysis by adopting an air-tight seal criterion criterion of a'contact pressure weighting index + minimum contact length ';selecting a special cutter measuring tool, and designing a trial machining process; trial-manufacturing processing of the coupling and the pipe body is carried out; and performing a physical performance detection and evaluation test. Organic unification of all links and elements in the whole process design is fully considered, specific process elements can be accurately and efficiently positioned, integrated design optimization of the integrity of the special screwed joint for the shale gas is achieved, the overall strength and the sealing performance of the structure are improved, and the use safety is guaranteed.

Description

Technical field: [0001] The invention relates to a special threaded joint oil casing technology for petroleum pipes, in particular to a whole-process design optimization method for a special threaded joint oil casing for shale gas. Background technique: [0002] In recent years, with the acceleration of natural gas production and consumption, my country has increased its efforts to develop unconventional oil and gas such as shale gas, tight oil, tight gas, and coalbed methane. The exploration and development of shale gas resources has achieved rapid development and production Fast-growing achievements. [0003] Ordinary API threads (long round threads, partial trapezoidal threads) can no longer meet the exploration and development needs of shale gas with complex well conditions. Therefore, it is necessary to develop high-performance special threaded joints for shale gas with high gas sealing and high connection strength for specific well conditions. . Due to the high technical dif...

AI Technical Summary

Problems solved by technology

[0003] Ordinary API thread (oblong thread, partial trapezoidal thread) can no longer meet the exploration and development needs of complex shale gas well conditions, so it is necessary to develop special threaded joints with high performance such as high gas sealing and high connection strength for specific well conditions.

Due to the difficulty, long period and high cost of special thread development technology, the domestic self-developed special thread products are few and low in output, which cannot meet market needs

Images