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Tubing string service life prediction method

A life prediction and tubing string technology, applied in the field of petroleum exploration, can solve problems such as inaccurate tubing life prediction, and achieve the effects of reducing or avoiding safety risks, reducing costs, and accurate and reasonable tubing string life.

Active Publication Date: 2013-07-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem of inaccurate tubing life prediction in the prior art, a tubing string life prediction method is provided that can accurately predict the tubing life, which plays a major role in production safety

Method used

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Embodiment Construction

[0019] The following description will enable any person skilled in the art to utilize the present invention. The descriptions provided in the specific embodiments and applications are examples only. Various extensions and combinations of the embodiments described herein will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the invention . Thus, the present invention is not limited to the embodiments shown, but the present invention covers the widest scope consistent with the principles and features shown herein.

[0020] The detailed description below is presented in the form of flow diagrams, logical modules and other symbolic manipulation representations that can be executed on a computer system. A program, computer-implemented step, logic block, procedure, etc., is conceived herein to be a self-consistent sequence of one or more steps or in...

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Abstract

The invention relates to the technical field of oil exploration, in particular to a tubing string service life prediction method. The tubing string service life prediction method comprises the steps of calculating maximum stress of a new tubing string; calculating maximum stress of the tubing string at some time; calculating a tensile safety coefficient of the new tubing string; calculating a tensile safety coefficient of the tubing string at some time according to the calculated tensile safety coefficient of the new tubing string; and enabling fall time of the tensile safety coefficient of the tubing string to be tensile safety service life when the tensile safety coefficient of the tubing string at some time is equal to a preset safety coefficient threshold.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, and in particular the invention relates to a method for predicting the life of an oil pipe string. Background technique [0002] In the literature, the life of the tubing string is calculated based on the ultimate tensile load, the maximum internal pressure and the external collapse pressure of the tubing string. The safety factor of the tubing string is not considered, and the predicted life of the tubing string is too long. In other literatures, the life of the tubing string is calculated based on the corrosion and perforation of the tubing. Obviously, the predicted life of the tubing string is too long. In another document, the fatigue life of the tubing string coupling is also proposed, and this method of predicting the life of the tubing string is not very reasonable. Contents of the invention [0003] In order to solve the problem of inaccurate oil pipe life prediction in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/007
Inventor 周广厚
Owner PETROCHINA CO LTD
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