Residual intensity evaluation method of corrosion defect contained steam injection pipeline compensator bent pipe

Abstract

The invention relates to a residual intensity evaluation method of a corrosion defect contained steam injection pipeline compensator bent pipe, which comprises the following steps of: computing the bearing capacity of the bent pipe through a formula plimit=Sigma f / (r Eta+3r2 Alpha Eta 2), wherein plimit in the formula is the ultimate bearing capacity of the bent pipe, Sigma f is the flow stress of a pipe, r is the mean radius of the bent pipe, alpha is the ellipticity of the bent pipe, Eta is an intermediate variable, t in the formula is the wall thickness of a pipeline, d is a defect depth, k is an intermediate variable, L in the formula is a defect length and Dm is the mean diameter of the bent pipe; carrying out full-size hydrostatic bursting test verification by utilizing the compensator bent pipe with corrosion defects, and comparing a measured value with a theoretical value, wherein the theoretical value is smaller, and an error is 24.7 percent. A result indicates that the method has higher engineering utility value and reasonable safe reliability.

Description

Technical field [0001] The invention relates to a method for evaluating the remaining strength of a compensator elbow of a steam injection pipeline containing corrosion defects for heavy oil heating. Background technique [0002] Steam huff and puff and steam flooding are the two main methods for heavy oil production. Both of these production technologies require continuous injection of high-temperature steam into the ground through surface steam injection pipelines and downhole steam injection pipe strings. Under alternating high and low temperature operating conditions, the steam injection pipeline will be elongated and shortened. In order to eliminate the stress caused by such expansion and contraction, during the design and construction of the steam injection pipeline, the compensator elbow is usually connected between the straight pipe sections to compensate for the axial and lateral thermal deformation of the pipeline to ensure the safe operation of the pipeline. [0003] Du...

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Problems solved by technology

[0006] The purpose of the present invention is to design a residual strength evaluation method for compensator elbows of steam injection pipelines containing corrosion defects, to solve the problem that existing residual strength evaluation specifications are not applicable to elbows, and to fill in the residual strength evaluation method of pipelines in elbows. gaps in evaluation

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