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A Clearance Evaluation Method for Rock Misaligned Fracture Surfaces

An evaluation method and crack technology, applied in measurement devices, instruments, optical devices, etc., can solve the problems of evaluation gap, inability to evaluate crack surface gap, inability to apply a group of crack surfaces, etc., to achieve improved accuracy, feasibility and efficiency. The effect of practicality

Active Publication Date: 2016-09-21
卢渊 +3
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Problems solved by technology

At present, the experimental method for evaluating the conductivity formed by the corresponding fracture surface is relatively mature, but it is unable to evaluate the gap generated when the corresponding fracture surface has displacement, and it is also impossible to use a group of fracture surfaces to evaluate the gap generated by different displacement directions and displacement

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  • A Clearance Evaluation Method for Rock Misaligned Fracture Surfaces
  • A Clearance Evaluation Method for Rock Misaligned Fracture Surfaces
  • A Clearance Evaluation Method for Rock Misaligned Fracture Surfaces

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Embodiment Construction

[0031] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

[0032] A method for evaluating gaps of rock fracture surfaces, the specific steps are as follows:

[0033] (1) Split the formation core to obtain two corresponding fracture surfaces A and B. Two new surfaces are produced when the rock splits or fractures under the action of formation stress. These two surfaces have a certain corresponding relationship, which we call the corresponding fracture surface.

[0034] (2) Use a high-precision 3D laser scanner to scan the corresponding fracture surfaces of the two rock cores to obtain the original 3D geometric data of the fracture surfaces of the two rocks, and the spatial points are represented by (x, y, z). For example, after the core is split, the fracture area is 25mm×30mm=750mm2. If the scanner...

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Abstract

The invention relates to a gap evaluation method for dislocated fracture surfaces. The formation core is split into two rocks, and two fracture surfaces A and B with corresponding relationship are obtained respectively; Surface scanning to obtain the original 3D geometric data (x, y, z) of the fracture surface of the two rocks; using the trigonometric function relationship to change the original 3D geometric data of the A fracture surface as a whole, the dislocation of the A fracture surface in different directions can be simulated; Flip the 3D geometric data of the dislocation A fracture surface uniaxially to obtain the new 3D geometric data of the A fracture surface; accumulate the new 3D geometric data of the A fracture surface and the original 3D geometric data of the B fracture surface to obtain the dislocation The number of gaps on the fracture surface and the distribution of gaps at different coordinate positions. The number and distribution of gaps on the dislocation fracture surface obtained by this method are consistent with the actual fracture shape, which greatly improves the accuracy and satisfies the digital simulation study of meso-mechanics.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas engineering, and relates to indoor experimental evaluation of oil and gas field exploitation technology, in particular to a gap evaluation method for rock dislocation fracture surfaces. Background technique [0002] When the formation rock is affected by factors such as tectonic movement or hydraulic fracturing, cracks will occur. Since the stress azimuth angles of the two rocks after the cracks are separated are different, when the stress is released, the corresponding crack surfaces on the two rocks will There may be more or less dislocation, and it will not be completely closed, forming a crack channel with a certain gap and conductivity. At present, the experimental method for evaluating the conductivity formed by the corresponding fracture surface is relatively mature, but it is unable to evaluate the gap generated when the corresponding fracture surface has displacement, and it is al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/14
Inventor 卢渊伊向艺肖阳张浩张玉戴亚婷顾亚鹏
Owner 卢渊
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