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Method and system for predicting reliability of well casing

A drilling casing and prediction method technology, which is applied in earthwork drilling, wellbore/well components, instruments, etc., can solve problems such as inaccurate reliability prediction results, and improve drilling efficiency, casing reliability accuracy, Avoid the effect of damage

Active Publication Date: 2021-08-20
YANGTZE UNIVERSITY
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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a drilling casing reliability prediction method and system to solve the problem of inaccurate casing reliability prediction results

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  • Method and system for predicting reliability of well casing
  • Method and system for predicting reliability of well casing
  • Method and system for predicting reliability of well casing

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Embodiment Construction

[0020] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work belong to the protection scope of the present invention. The principles and features of the present invention will be described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention, not to limit the scope of the present invention.

[0021] The term "comprising" and other expressions with similar meanings in the description or claims of the p...

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Abstract

The invention provides a method and a system for predicting the reliability of a well casing. The method comprises the following steps: acquiring a stratum Poisson coefficient, an overlying stratum pressure gradient, a planned drilling fluid density, a completion fluid density and a casing emptying state at a planned casing running position; under different crustal stress environments, based on numerical simulation of creep behaviors of rock stratums around a borehole, and in combination with stress analysis of the casing and extrusion strength of the casing, calculating actual load borne by the casing when the casing reaches a critical safety state; and comparing the actual load borne by the casing with zero, and judging whether the casing is safe or not. Through the scheme, the accuracy of casing reliability prediction can be improved, and reliable guidance is provided for drilling operation.

Description

technical field [0001] The invention relates to the field of oil field drilling, in particular to a method and system for predicting the reliability of a drilling casing. Background technique [0002] There are large sections of salt-gypsum rock and soft mudstone formations in the underground rock formations of many oilfields, and casing damage in these lithologic formations accounts for a large proportion. Many researchers at home and abroad believe that the main reason for the casing damage of the plastic layer is the creep of the rock, which leads to the gradual increase of the extrusion load on the outer wall of the casing, which causes the casing to shrink and fail. In order to ensure that the casing does not collapse and cause complicated situations such as pipe sticking during the drilling process, it is necessary to analyze the external load on the casing, especially in the highly fluid salt-gypsum formation and soft mudstone formation. . [0003] When drilling for...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20E21B49/00G06F119/14
CPCG06F30/20E21B49/00G06F2119/14
Inventor 李忠慧胡棚杰楼一珊张俊成朱亮张艳
Owner YANGTZE UNIVERSITY
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