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Method for rapidly evaluating ultimate torsional property of multilayer non-sticky marine flexible pipe

A technology of marine flexible pipe and evaluation method, which is applied in the field of rapid evaluation of ultimate torsional performance of multi-layer non-bonded marine flexible pipe, can solve the gap of real force characteristics of multi-layer non-bonded marine flexible pipe, multi-layer non-bonded marine flexible pipe The structural analysis of offshore flexible pipelines is complicated, and the friction and contact characteristics between layers are not considered.

Inactive Publication Date: 2018-01-09
SHANGHAI UNIV
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Problems solved by technology

However, the structural analysis of multilayer unbonded marine flexible pipelines is very complicated. The models used by most researchers either greatly simplify the model or do not consider the frictional contact characteristics between layers. There is a certain gap in the actual force characteristics of the pipeline

Method used

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  • Method for rapidly evaluating ultimate torsional property of multilayer non-sticky marine flexible pipe
  • Method for rapidly evaluating ultimate torsional property of multilayer non-sticky marine flexible pipe
  • Method for rapidly evaluating ultimate torsional property of multilayer non-sticky marine flexible pipe

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Embodiment Construction

[0028] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] Use this evaluation method to evaluate a multi-layer unbonded marine flexible pipe, which includes an inner liner, a compressive armor layer (6 layers), a tensile armor layer (2 layers), a wear-resistant layer, an insulation layer, The middle cladding layer and the outer cladding layer have a total of 13 layers. like figure 1 As shown, the specific steps are as follows:

[0030] 1) Measure the structural parameters of multi-layer unbonded marine flexible pipes by using special measuring tools such as internal diameter gauge, disc micrometer, thickness gauge, and image measuring instrument. The main measurement results are shown in Table 1.

[0031] Table 1 Main structural parameters of flexible pipe

[0032]

[0033] 2) Using MTS universal testing machine, density measuring instrument and other special material testing equipment...

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Abstract

The invention provides a method for rapidly evaluating the ultimate torsional property of a multilayer non-sticky marine flexible pipe. The method comprises the following steps: measuring the structure parameters of a multilayer non-sticky flexible pipe; determining the mechanical parameters of the material used by each functional layer of the multilayer non-sticky flexible pipe; carrying out meshgeneration on a three-dimensional geometric model of the multilayer non-sticky flexible pipe; establishing a three-dimensional finite element calculation model of the flexible pipe by considering intra-layer and inter-layer frictional contact; getting the stress distribution characteristics of the multilayer non-sticky flexible pipe under the action of working torque through calculation; calculating and determining the safety coefficient of each functional layer under the current load condition on the basis of the von Mises stress peak value of each functional layer and the material yield strength corresponding to each functional layer, and taking the minimum safety coefficient among the safety coefficients of the functional layers as the torsional safety coefficient of the flexible pipe;and gradually applying a working torque until the torsional safety coefficient of the multilayer non-sticky flexible pipe is reduced to 1, and getting the ultimate working torque of the multilayer non-sticky flexible pipe. Through the method, the ultimate torsional property of a multilayer non-sticky flexible pipe can be evaluated rapidly.

Description

technical field [0001] The invention relates to the technical field of offshore oil and gas exploitation and transportation, in particular to a method for quickly evaluating the ultimate torsional performance of a multi-layer non-bonded marine flexible pipe. Background technique [0002] Multi-layer non-bonded marine flexible pipelines are essential equipment for the exploitation and transportation of offshore oil and gas resources. The working torque is also increasing. In order to ensure that the marine flexible pipe can meet the harsh service environment, its torsional performance should be evaluated before use. [0003] Full-scale physical experiments are a reliable method to evaluate the comprehensive mechanical properties of multi-layer unbonded marine flexible pipelines. However, they are expensive, long-term, and cannot intuitively reflect the internal force characteristics of flexible pipes under complex loads. Using numerical simulation to evaluate the comprehens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/02G06F17/50
Inventor 狄勤丰陈锋王文昌张鹤陈薇陈洛印吴志浩
Owner SHANGHAI UNIV
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