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A calculation method for quantitatively evaluating the sealing performance of a non-API oil casing joint

A technology for quantitative evaluation and sealing performance, applied in calculation, computer-aided design, geometric CAD, etc., can solve the problems that the quantitative relationship of sealing performance cannot be revealed, and has not been considered, so as to improve reliability and versatility, and solve the problems of accuracy and operation Effects of error, enhanced flexibility and efficiency

Inactive Publication Date: 2019-04-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

In the calculation method, the influence of the technical processing parameters (such as the contact form of the sealing surface, contact area, surface roughness, sealing grease and surface treatment technology, etc.) at the sealing structure of the oil-casing joint on the sealing effect is not considered. Unable to reveal the quantitative relationship between the above factors and sealing performance, making the key processing parameters at the sealing structure of non-API oil-casing joints a patent of a few foreign manufacturers

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  • A calculation method for quantitatively evaluating the sealing performance of a non-API oil casing joint
  • A calculation method for quantitatively evaluating the sealing performance of a non-API oil casing joint
  • A calculation method for quantitatively evaluating the sealing performance of a non-API oil casing joint

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Embodiment Construction

[0038] A calculation method for quantitatively evaluating the sealing performance of non-API oil-casing joints according to the present invention, and its preferred specific implementation method can be found in figure 1 ,include:

[0039] Step 1: Build a metal-to-metal seal microscopic leak model with preset surface roughness

[0040]Using the Monte Carlo random normal distribution sampling formula combined with the sealing surface roughness processing parameters, the sealing surface contour curve that obeys the normal distribution and the preset surface roughness value is simulated.

[0041] Monte Carlo random normal distribution sampling formula:

[0042]

[0043] In the formula, μ is the sample mean; σ is the sample standard deviation; r 1 , r 2 It is a random number sequence uniformly distributed between [0,1].

[0044] The surface roughness value of the sealing surface is taken as the sample mean value μ, and one-sixth of the maximum height value of the sealing su...

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Abstract

The invention relates to a calculation method for quantitatively evaluating the sealing performance of a non-API oil sleeve joint. The method comprises the following steps: firstly, combining a MonteCarlo random normal distribution sampling formula with sealing surface roughness; and carrying out simulation to obtain a contour curve of the sealing surface, obtaining simulation curve geometric common characteristics according to contour curve geometric morphology characteristic statistical data under different sample capacities and surface roughness, and establishing a metal-to-metal sealing microscopic leakage model; then deducing a gas leakage rate calculation formula containing the microscopic geometrical morphology characteristics of the sealing surface by combining the characteristicsof the leaked gas, and finally, according to the processing parameters of the main sealing structure of the non-API oil casing pipe joint, obtaining the total sealing pre-tightening pressure of the main sealing surface, and performing calculating to obtain the total gas leakage rate of the main sealing structure, thereby obtaining the non-API oil casing pipe joint sealing performance quantitativeevaluation and prediction method. The influence of sealing machining parameters of multiple oil casing pipe joints and the characteristic of leaked gas on the leakage rate is considered.

Description

technical field [0001] The invention relates to a non-API joint oil casing technology for high-pressure gas well oil pipes, in particular to a calculation method for quantitatively evaluating the sealing performance of non-API oil casing joints. Background technique [0002] With the large-scale exploitation of high-pressure gas fields in my country, the application of non-API oil and casing with high air tightness is becoming more and more extensive. However, non-API oil casing has its unique sealing structure compared with API oil casing, so the general API oil casing evaluation standard is not applicable to non-API oil casing joints. The joint sealing performance evaluation method in this type of standard is to take the "joint thread contact surface" as the evaluation object, from the perspective of "zero" leakage, first calculate the "thread sealing surface contact pressure", and then compare the "thread sealing surface contact pressure" The sealing performance of the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/06G06F30/20
Inventor 许志倩闫怡飞闫相祯曹爱请盖永革秦冬黎沈蓉郑晓云
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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