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A gray system submarine oil and gas pipeline drop object corrosion reliability evaluation method

A technology of oil and gas pipelines and gray systems, applied in the directions of instruments, data processing applications, design optimization/simulation, etc., can solve problems such as incomplete submarine pipeline corrosion prediction systems, achieve accurate prediction of corrosion laws, improve accuracy, and improve precision Effect

Active Publication Date: 2021-08-03
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide a method for evaluating the reliability of the corrosion of the falling objects in the gray system submarine oil and gas pipelines. The system is incomplete for the submarine pipeline corrosion prediction system

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  • A gray system submarine oil and gas pipeline drop object corrosion reliability evaluation method
  • A gray system submarine oil and gas pipeline drop object corrosion reliability evaluation method
  • A gray system submarine oil and gas pipeline drop object corrosion reliability evaluation method

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Embodiment Construction

[0035] The present invention is described in further detail below in conjunction with accompanying drawing:

[0036] The gray system submarine oil and gas pipeline falling object corrosion reliability evaluation method of the present invention comprises the following steps:

[0037] 1) Obtain the data sequence X of each corrosion detection point of the oil and gas pipeline (0) =(x (0) (1),x (0) (2),...,x (0) (n)), where x(0) (k) is the corrosion depth detected for the kth time;

[0038] 2) Calculate the smoothness ratio ρ(k) and grade ratio σ of the data sequence of each corrosion detection point of the oil and gas pipeline (1) (k);

[0039] 3) The smoothness ratio ρ(k) and grade ratio σ of the data sequence of each corrosion detection point of the oil and gas pipeline obtained in step 2) (1) (k) Determine whether the data sequence of each corrosion detection point of the oil and gas pipeline satisfies the smoothness condition. When the data sequence of each corrosion de...

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Abstract

The invention discloses a gray system submarine oil and gas pipeline drop object corrosion reliability evaluation method, comprising: establishing a gray differential equation, calculating gray system parameter values ​​according to pipeline corrosion depth by least square estimation, and using a traditional gray system to perform a simulation Calculate the simulated value; then, according to the inconsistency between the simulated derivative recovery value and the cumulative reduction value, in order to reduce the error caused by the reciprocating operation, the residual error is used to correct the simulated value for a secondary simulation, and the primary predicted value and the secondary predicted value are compared. Values ​​are combined to obtain a complete subsea pipeline corrosion correction model for prediction, thereby improving the prediction accuracy of pipeline corrosion depth. Finally, taking a certain subsea pipeline test section as an example, using the gray system of tail section residual error correction to predict the pipeline corrosion depth Through simulation, compared with the traditional gray system, the prediction accuracy has been significantly improved, so that the pipeline can be repaired or replaced in time, thereby reducing the resulting economic losses and safety hazards.

Description

technical field [0001] The invention belongs to the technical field of oil and gas pipeline transportation, and relates to a reliability evaluation method for corrosion of falling objects in a gray system submarine oil and gas pipeline. Background technique [0002] Over the past few decades, the world's energy consumption has continued to increase, and energy demand has continued to rise. This growing demand and limited onshore reserves have led to increased offshore exploration and rapid expansion of offshore engineering and subsea transmission systems. During installation and operation of offshore platforms, heavy lateral loads falling into seawater can cause significant impact damage to subsea pipeline networks and risers. In addition, after the completion of pipeline laying, it will continue to be affected by the risk of falling objects, including anchoring, anchoring or dragging anchors during offshore fishing activities; anchor strikes, shipwrecks or groundings durin...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/02G06F30/20G06F113/14
CPCG06Q10/0635G06Q10/0639G06Q50/02G06F30/20G06F2113/14
Inventor 张新生赵梦旭骆正山李亚云高东东王太郎
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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