Gap evaluation method for rock rupture crack surface

A technology for rock fractures and evaluation methods, which is applied in the direction of measuring devices, instruments, and optical devices, can solve problems such as the inability to evaluate the crack surface gap, the evaluation gap, and the inability to apply a group of fracture surfaces, etc., to achieve feasibility and practicability , the effect of improving accuracy

Active Publication Date: 2014-10-29
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 th...

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  • Gap evaluation method for rock rupture crack surface
  • Gap evaluation method for rock rupture crack surface
  • Gap evaluation method for rock rupture crack surface

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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 a rock rupture crack surface. The gap evaluation method comprises the following steps of: splitting a stratum core into two rocks to acquire two crack surfaces A and B with a corresponding relationship respectively; scanning the corresponding crack surfaces of the two rock cores by a three-dimensional laser scanner respectively to acquire the original three-dimensional geometric data (x, y, z) of the crack surfaces of the two rocks; integrally changing the original three-dimensional geometric data of the crack surface A by virtue of a triangular function relationship, and simulating the ruptures of the crack surface A in different orientations; homotaxially turning over the three-dimensional geometric data of the crack surface A after rupture; accumulating the new three-dimensional geometric data of the crack surface A with the original three-dimensional geometric data of the crack surface B to acquire the quantity of gaps and the distribution condition of the gaps in different coordinate positions in the crack surfaces after rupture. The quantity and the distribution condition of the gaps in the rupture crack surfaces, which are acquired by the method are the same as an actual crack shape, thus greatly improving the accuracy, and meeting the digital simulation researches of mesomechanics well.

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...

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Application Information

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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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