Shale compressibility comprehensive evaluation method based on uniaxial strength experiment

A comprehensive evaluation and strength technology, applied in the direction of applying stable tension/pressure to test material strength, etc., can solve the problem of complex initial damage of shale, extremely developed bedding, heterogeneous composition, nonlinear mechanics, and constraints on shale Gas exploration and development, poor volume fracturing effects, etc., to achieve the effect of convenient data processing, easy operation, simple experimental process, and intuitive and simple post-processing

Inactive Publication Date: 2015-07-15
SOUTHWEST PETROLEUM UNIV
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However, most of the existing shale compressibility indoor evaluation techniques use a single brittleness index based on brittle mineral components and elastic parameters, which is difficult to reflect the complex initial damage of shale, extremely developed b

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  • Shale compressibility comprehensive evaluation method based on uniaxial strength experiment
  • Shale compressibility comprehensive evaluation method based on uniaxial strength experiment
  • Shale compressibility comprehensive evaluation method based on uniaxial strength experiment

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[0020] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0021] Such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 As shown, the present invention is a method for comprehensive evaluation of shale compressibility based on uniaxial strength experiment, and the method includes the following steps:

[0022] ①Take the shale core or outcrop sample of the target layer and process it into a standard cylindrical sample with a diameter of 25mm and a height of 40-50mm, smooth the end face, and place it in a servo testing machine for uniaxial compressive strength test until the sample fails and breaks. Real-time record Stress-strain data, record the elastic modulus and Poisson's ratio of the sample, and draw the stress-strain curve.

[0023] ② Calculate the normalized elastic modulus E by combining the measured elastic modulus E and Poisson's ratio v with the elastic modulus and Poisson's ratio extreme value of this bl...

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Abstract

The invention provides a shale compressibility comprehensive evaluation method based on uniaxial strength experiment. The method comprises the steps of (1) taking a shale core sample for executing uniaxial compressive strength test, testing an elasticity parameter, and drawing a stress-strain curve diagram; (2) calculating normalized elasticity modulus and normalized poisson ratio to obtain a brittleness index; (3) obtaining key points on the stress-strain curve, and calculating the shape index of the stress-strain curve; (4) obtaining fracture distribution diagram of the side face of the fixed sample, and calculating a fracture distribution index through box-counting dimension method; (5) measuring spallation fragment mass distribution at different scales through a screen and a balance so as to obtain a block distribution index; and (6) calculating arithmetic mean value of the obtained brittleness index, shape index of the stress-strain curve, fracture distribution index and block distribution index of fragments to get the comprehensive compressibility index. The method provided by the invention is used for evaluating fracture net forming capability of the shale after being compressed, the experiment is simple and easy to carry out, and post treatment is visual and simple, so that the method is suitable for indoor evaluation and oilfield in-site application.

Description

technical field [0001] The invention relates to a shale compressibility comprehensive evaluation method based on a uniaxial strength test, which belongs to the technical field of petroleum development. Background technique [0002] The development of shale gas is a major demand of my country's energy strategy, but unlike the development of shale gas in the United States, my country's shale gas has the characteristics of complex occurrence and difficult development, ultra-low porosity, ultra-low permeability, and high clay content Large-scale hydraulic fracturing of long horizontal wells has become a necessary means for shale gas development. The study found that the initial damage degree and brittleness of shale have a significant impact on the effect of fracturing, and are also key indicators for evaluating the mechanical properties of shale reservoirs, and also have a significant impact on the stability of wellbore walls. Compressibility evaluation is particularly importan...

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Application Information

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IPC IPC(8): G01N3/08
Inventor 朱海燕陶雷刘清友
Owner SOUTHWEST PETROLEUM UNIV
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