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A Two-Stage Tubing String Life Prediction Method

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

Active Publication Date: 2015-10-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of inaccurate oil pipe life prediction in the prior art, a two-stage oil pipe string life prediction method is provided, which can accurately predict the life of the oil pipe, which has played a major role in production safety

Method used

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  • A Two-Stage Tubing String Life Prediction Method
  • A Two-Stage Tubing String Life Prediction Method
  • A Two-Stage Tubing String Life Prediction Method

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Embodiment Construction

[0040] 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.

[0041] 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, and particularly to a method for predicting service life of a two-stage tubing string. The method comprises the steps of: respectively calculating initial maximum stresses of tubing strings in a big size and a small size of the two-stage tubing string, a maximum stress of each tubing string at a certain time and a tensile safety coefficient of each tubing string; calculating a tensile safety coefficient at a certain time based on the calculated tensile safety coefficient of each tubing string; and when the tensile safety coefficient of the tubing string at a certain time is equal to a preset safety coefficient threshold value, indicating that the dropping time of the tensile safety coefficient of each tubing string is the tensile safety service life of each tubing string.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a two-stage tubing string life prediction method. 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. [0003] The safety of oil and gas well strings needs special attention, especially when oil and gas wells are relatively deep, or when there ...

Claims

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Application Information

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IPC IPC(8): E21B47/007
Inventor 周广厚
Owner PETROCHINA CO LTD
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