Method, device and system for determining brittleness index of rocks

A brittleness index and rock technology, applied in the field of determining the brittleness index of rock, can solve the problems affecting the accuracy of rock brittleness evaluation results, and achieve the effect of high accuracy and accurate evaluation

Active Publication Date: 2018-09-11
PETROCHINA CO LTD
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Problems solved by technology

In summary, the existing rock brittleness evaluation method based on the stress-strain curve affects the accuracy of the rock brittleness evaluation results.

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  • Method, device and system for determining brittleness index of rocks
  • Method, device and system for determining brittleness index of rocks
  • Method, device and system for determining brittleness index of rocks

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[0053] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below in conjunction with the drawings in one or more embodiments of this specification Obviously, the described embodiments are only some of the embodiments in the description, not all of them. Based on one or more embodiments in the description, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the embodiments of the description.

[0054]The rock brittleness index is a physical quantity that characterizes the speed (difficulty) of the transient change before the rock fractures, and can be used to reflect the complexity of the formation of fractures after reservoir fracturing. Generally, formations with a high brittleness index are hard and brittle, and ...

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Abstract

The embodiment of the invention discloses a method, a device and a system for determining a brittleness index of rocks. The method comprises the following steps: obtaining a stress strain curve of therocks; determining recoverable elastic energy of peak value strength, recoverable elastic energy of residual strength, pre-peak energy and post-peak energy according to the stress strain curve; determining rock cracking loss elastic energy according to the difference between the recoverable elastic energy of the peak value strength and the recoverable elastic energy of the residual strength; determining rock total cracking energy according to the sum of the pre-peak energy and the post-peak energy; calculating the ratio of the rock cracking loss elastic energy to the rock total cracking energy and determining the ratio as the brittleness index of the rocks. By adopting the method provided by the embodiment of the invention, the brittleness of the rocks can be more accurately evaluated.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration and development, in particular to a method, device and system for determining the brittleness index of rocks. Background technique [0002] The stress-strain curve of the rock reflects the whole process from the beginning of deformation, destruction to the final loss of bearing capacity of the rock under the action of external loads. It is the most intuitive and effective method for qualitatively evaluating the brittleness of rocks. Through the whole stress-strain curve recorded in the experiment, the characteristics of the rock under the same or different stress states can be quantitatively obtained, which has the advantages of simplicity, convenience, and no need for additional experiments. In recent years, scholars at home and abroad have proposed many different methods based on the stress-strain curve. fragility index. Among them, the stress-strain curve method is divided into...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 任岩曹宏杨志芳卢明辉晏信飞李晓明
Owner PETROCHINA CO LTD
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