A method for model sealing performance degradation stochastic model of underwater connector

A technology of sealing performance and degradation model, applied in the direction of instrument, design optimization/simulation, calculation, etc., can solve the problems affecting the accuracy of sealing performance analysis, inaccurate degradation model of sealing structure performance, etc., to achieve the effect of improving accuracy

Active Publication Date: 2019-02-01
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

In fact, the sealing performance is not only affected by the contact stress of the sealing surface, but also by the distribution of the contact stress on the entire effective contact length (Brown M W.Seals and sealing handbook[M].Elsevier SciencePublishers,2007.) , only t

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  • A method for model sealing performance degradation stochastic model of underwater connector
  • A method for model sealing performance degradation stochastic model of underwater connector
  • A method for model sealing performance degradation stochastic model of underwater connector

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[0032] Below in conjunction with accompanying drawing and specific embodiment, the present invention will be further described:

[0033] like figure 2 Shown is the basic structure of the subsea tree wellhead connector with a design pressure of 34.5MPa (5000psi) and a subsea wellhead 20in casing head, including the upper hub 1, the seal 2 and the lower hub 3.

[0034] like figure 1 As shown, the sealing performance degradation model modeling method of the underwater connector of the present invention comprises the following steps:

[0035] S1, according to the original structural size of the underwater connector and the actual working conditions, the actual working conditions include pressure, temperature, liquid and gas phase flow rates, water content and pipe inner diameter; use Abaqus or Ansys finite element software to establish the sealing performance of the connector Thermal-solid FEA parametric models such as image 3 shown;

[0036] S2, in order to consider the inf...

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Abstract

A method for model sealing performance degradation stochastic model of underwater connector features that that sealing contact strength is taken as the characterize quantity of sealing performance, and a connector sealing performance heat-solid finite element analysis parameterized model is established, the connector sealing performance is analyzed, the initial time t1 connector sealing performance quantification index is acquired; Secondly, according to the actual condition of the connector, the corrosion rate prediction model is used to predict the corrosion rate of the upper hub, the seal and the lower hub of the connector, so as to obtain the corrosion amount of the above-mentioned structure and the specific size of each structure after corrosion, structural parameter updating is performed on the connector sealing performance heat-solid finite element analysis parameterized model, and the sealing performance index fs2 of the connector at time t2 is calculated again. Thirdly, by using the same method, the connector sealing performance indexes corresponding at any time t3 and t4 are obtained as fs3 and fs4, respectively. At last, consider that randomness and irreversibility of the deterioration of the sealing performance of the connector, Gamma stochastic process is selected to describe the mechanism of seal performance degradation. The characteristic parameters of Gamma stochastic process are estimated by using the connector seal performance indexes fs1, fs2, fs3 and fs4 at different times, and the connector seal performance degradation stochastic model based on Gamma process is obtained.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering, and in particular relates to a modeling method for a performance degradation model of an underwater connector sealing structure. Background technique [0002] The underwater connector is the key equipment of the offshore oil and gas underwater production system. It is mainly used for the connection between the underwater production pipelines. The sealing ability is its most important performance index. Since the connector is corroded by production fluid and seawater for a long time during service, and is also subjected to random loads such as ocean currents, the performance degradation of the connector exists objectively. It is necessary to establish a performance degradation model of the connector to obtain the change law of the sealing performance index during the service period. It is convenient for subsequent reliability analysis of connectors. [0003] At present, the contact...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 曾威宋红任涛孙文岳治
Owner XI'AN PETROLEUM UNIVERSITY
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