Method for predicting corrosion lifetime of casing pipe

A technology of life prediction and casing, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problem of not truly reflecting the corrosion life of the casing, and achieve the effect of accurate life and avoiding safety risks.

Active Publication Date: 2017-10-24
SOUTHWEST PETROLEUM UNIV
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This invention can effectively predict the remaining life of the casing in a relatively short period of time, but this method uses

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  • Method for predicting corrosion lifetime of casing pipe
  • Method for predicting corrosion lifetime of casing pipe
  • Method for predicting corrosion lifetime of casing pipe

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[0049] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] figure 1 A flow chart of a casing corrosion life prediction method is given.

[0051] Step 1: According to the service environment of the oil and gas well casing, use the high temperature and autoclave to simulate the actual working conditions to carry out the corrosion test on the casing material, and the test time is n=[X 1 ,X 2 ,X 3 ,…X i ,…X n ], n represents the test time, X i =3d, 7d, 15d, 30d, 90d and 180d, and use the corrosion rate formula (1) to obtain the uniform corrosion rate value of the material respectively;

[0052]

[0053] where: v cor is the measured corrosion rate (mm / a), Δm is the mass difference of the sample before and after the corrosion test (g), ρ is the density of the sample (g / cm), and A is the surface area of ​​the sample (cm 2 ), n is the corrosion time (d);

[0054] Step 2: Perform multiple lin...

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Abstract

The invention discloses a method for predicting a corrosion lifetime of a casing pipe, which belongs to the field of corrosion protection of oil and gas well. The method is characterized by comprising the following steps: firstly performing corrosion test for casing pipe steel under a simulation working condition by utilizing a high-temperature high-pressure kettle, obtaining a uniform corrosion rate value, then obtaining an actual wall thickness of the casing pipe, and respectively solving remaining internal pressure strength and remaining collapse resisting strength of the casing pipe by utilizing the actual wall thickness of the casing pipe; and then calculating a remaining internal pressure resisting safety coefficient and a remaining collapse resisting strength safety coefficient of the casing pipe, respectively calculating an internal pressure resisting safety service lifetime and a collapse resisting safety service lifetime of the casing pipe according to a given internal pressure resisting safety coefficient threshold value and a collapse resisting safety threshold value, and finally obtaining a safety service lifetime of the casing pipe. The method has the advantages that the lifetime of the casing pipe can be reasonably predicted, and the safety risk caused by the corrosion of the oil and gas well casing pipe can be reduced or avoided.

Description

technical field [0001] The invention relates to the field of oil and gas well corrosion protection, in particular to a method for predicting the corrosion life of a casing. Background technique [0002] The corrosive medium contained in the highly acidic gas field will cause the casing to corrode, and the corrosion will cause the casing wall to become thinner. waste. How to reasonably balance the safety and economy of the casing is the key factor to realize the safe and economical service of casing gas wells. [0003] At present, for the research on the life prediction method of the oil well tubing string, "A Method for Predicting the Life of the Tubing String" (Application Publication No.: CN 103206205 A) mainly considers the stress of the tubing string, and accurately predicts the life of the tubing string, reducing or Avoid safety risks in oil and gas well tubing strings. However, the tubing mainly considers the tensile load, while the casing mainly considers the inter...

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Application Information

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IPC IPC(8): G01N17/00
Inventor 曾德智董宝军喻智明刘芮嘉李皓蔡乐乐侯铎张海鑫施太和
Owner SOUTHWEST PETROLEUM UNIV
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