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Determination method, storage medium and equipment for pressure test load of threaded wellhead seal detection

A determination method and sealing detection technology, applied in drilling equipment, sealing/package, measurement, etc., can solve problems such as thread leakage

Active Publication Date: 2022-07-05
BC P INC CHINA NAT PETROLEUM CORP +1
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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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  • Determination method, storage medium and equipment for pressure test load of threaded wellhead seal detection
  • Determination method, storage medium and equipment for pressure test load of threaded wellhead seal detection
  • Determination method, storage medium and equipment for pressure test load of threaded wellhead seal detection

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Embodiment Construction

[0039] The present invention provides a method for determining a pressure test load for oil casing gas sealing thread wellhead seal detection, comprising the following steps:

[0040] S1, analysis sample selection;

[0041] The limit tolerance is used to reflect the main parameters of the thread structure. The pitch diameter of the thread, the taper of the thread, the diameter of the sealing surface and the ovality are selected within the product design tolerance range (see Table 1 and Table 2). The maximum surplus, that is, to ensure that the inspected threaded products are within the qualified processing tolerance range, and after the three steps of internal pressure loading, load retention and unloading of the wellhead pressure test, there is still a good sealing integrity to ensure the subsequent oilfield downhole working conditions load safe use.

[0042] The maximum interference fit of the seal within the tolerance range makes the sealing surface have the maximum plasti...

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Abstract

The invention discloses a method, storage medium and equipment for determining a pressure test load for threaded wellhead seal detection. An analysis sample is selected according to the limit tolerance; a material mechanics model is established; Calculate the contact pressure and length of the seal during loading and unloading under different internal pressures, and analyze the contact pressure and length of the seal; determine the applicable criteria for tightness, that is, the envelope of the safety factor of the triaxial design of the downhole pipe string is less than 80%. Control the reduction within 20%; determine the wellhead pressure test load according to the pressure bearing capacity of the pipe body. The invention provides useful guidance for determining the internal pressure load of the airtight special threaded connection in the wellhead sealing detection pressure test, and ensures safe and reliable use in the well.

Description

technical field [0001] The invention belongs to the technical field of oil and natural gas development, and in particular relates to a method, a storage medium and equipment for determining a pressure test load for oil-casing gas-tight thread wellhead seal detection. Background technique [0002] Oil-casing gas-tight threaded connections are widely used in high-temperature, high-pressure and high-corrosion gas wells. The leakage of threaded connection of completion string, abnormal increase of 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 in the Dina 2 gas field are all tubing with special threaded joints. Nine wells that have not been put into production have experienced abnormal increases in casing pressure. Wells with increased casing pressure account for 81.8% of the total numb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/04E21B17/042E21B47/00E21B47/117G06F30/20G06F119/14
CPCE21B33/04E21B17/042E21B47/00G06F30/20G06F2119/14
Inventor 王建东张华礼李玉飞张林汪传磊朱达江田涛
Owner BC P INC CHINA NAT PETROLEUM CORP
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