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Method for testing fracture toughness of sleeve-cement interface

A technology of fracture toughness and testing method, which is applied in the direction of using stable tension/pressure to test material strength, measuring device, strength characteristics, etc. cracks, etc.

Pending Publication Date: 2021-07-23
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0002] Exploitation and use of low-permeability, shale oil and gas, tight oil and gas and other low-permeability and low-grade oil and gas resources have gradually become the trend of global oil and gas development. Low-permeability and tight oil and gas resources require large-scale reservoir reconstruction during the development process. Injection is likely to cause damage and deterioration of the mechanical properties of the casing and cement sheath materials. At the same time, cracks are prone to occur at the casing-cement sheath connection interface, and there is a risk of interface failure and fracture
[0003] In the prior art, there is no test method for the fracture toughness of the casing-cement interface to assess whether there is a risk of interface failure and fracture

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  • Method for testing fracture toughness of sleeve-cement interface

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Embodiment Construction

[0018] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0019] Such as figure 1 As shown, the embodiment of the present invention provides a kind of casing-cement interface fracture toughness testing method, comprises the following steps:

[0020] Step 1, processing casing-cement interface fracture toughness test sample;

[0021] Step 2. Obtain the elastic modulus and Poisson's ratio of the casing and cement stone in the casing-cement interface fracture toughness test sample;

[0022] Step 3, applying a symmetrical compressive load to the casing-cement interface fracture toughness test sample, and obtaining the critical load of the interface crack propagation of the casing-cement interface fracture toughness test sample;

[0023] Step 4. Calculat...

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Abstract

The invention provides a method for testing the fracture toughness of a sleeve-cement interface. The method comprises the following steps: step 1, processing a test sample for testing the fracture toughness of the sleeve-cement interface; step 2, acquiring the elastic modulus and Poisson ratio of the casing and set cement in the casing-cement interface fracture toughness test sample; step 3, applying a symmetric compression load to the casing-cement interface fracture toughness test sample, and obtaining a critical load of interface crack propagation of the casing-cement interface fracture toughness test sample; and step 4, calculating the interface energy release rate of the casing-cement interface fracture toughness test sample under the critical load condition, and comparing the interface energy release rate with the interface fracture toughness value of the casing-cement interface fracture toughness test sample to evaluate the crack propagation trend of the casing-cement interface fracture toughness test sample. According to the invention, the fracture toughness of the casing-cement interface can be effectively tested, and whether the casing-cement sheath connection interface has the risk of interface failure and fracture can be evaluated.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas engineering, in particular to a method for testing the fracture toughness of casing-cement interface. Background technique [0002] Exploitation and use of low-permeability, shale oil and gas, tight oil and gas and other low-permeability and low-grade oil and gas resources have gradually become the trend of global oil and gas development. Low-permeability and tight oil and gas resources require large-scale reservoir reconstruction during the development process. Injection is likely to cause damage and deterioration of the mechanical properties of casing and cement sheath materials. At the same time, cracks are prone to occur at the casing-cement sheath connection interface, and there is a risk of interface failure and fracture. [0003] In the prior art, there is no test method for the fracture toughness of the casing-cement interface to assess whether there is a risk of interfac...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/12
CPCG01N3/08G01N3/12G01N2203/0017G01N2203/0019G01N2203/0048G01N2203/0067G01N2203/0066G01N2203/0075
Inventor 董雪林高德利窦浩宇
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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