Threaded wellhead seal inspection pressure-test load determination method, storage medium and equipment

Abstract

The invention discloses a threaded wellhead seal inspection pressure-test load determination method, a storage medium and equipment. The threaded wellhead seal inspection pressure-test load determination method comprises the steps that samples are selected and analyzed according to ultimate tolerance fit; a material mechanic model is established; internal pressures are loaded on an oil casing, a threaded inner wall and the end face of a shoulder, the sealed contact pressure and length under the different internal pressures in the loading and unloading processes are calculated correspondingly,and the sealed contact pressure and length are analyzed; the applicable criteria for leakproofness is determined, that is, on the basis that the triaxial design safety factor envolope curve of a down-hole string is less than 80%, the reducing amount is controlled to be within 20%; and the wellhead pressure-test load is determined according to the pipe body internal pressure bearing capacity demand. According to the threaded wellhead seal inspection pressure-test load determination method, useful guidance is provided for gas seal special thread connection in wellhead leakproofness detection pressure-test internal pressure load determination, and safe and reliable use in the underground is ensured.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas development, and in particular relates to a method, a storage medium and equipment for determining a pressure test load of an oil-casing gas-seal threaded wellhead seal. Background technique [0002] Oil-casing gas-tight threaded connections are widely used in high-temperature, high-pressure, high-corrosion gas wells. Leakage of the threaded connection of the completion string, abnormal rise in production casing pressure and technical casing pressure can easily lead to casing failure, resulting in natural gas leakage from the wellhead or the surface, which leaves hidden dangers to safe production. The tubing used in the 11 gas wells of the Dina 2 gas field is all special threaded joint tubing. Abnormal rises in casing pressure have occurred in 9 wells that have not yet been put into production. Wells with elevated casing pressure accounted for 81.8% of the total number of wells. ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method, storage medium and equipment for determining the pressure test load of oil casing gas seal screw thread wellhead seal detection, and equipment to ensure the integrity of the downhole string seal to solve the problem of high temperature and high pressure. Gas well completion oil casing string in the process of gas production and gas production, the thread connection seal failure leakage problem

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