Acid corrosion crack etching morphology and flow conductivity testing method

A technology of etching morphology and testing method, applied in measurement devices, analysis of suspensions and porous materials, instruments, etc., can solve the changing process of the conductivity of tensile acid etching cracks that cannot be well simulated, and the representativeness of simulation experiments Not strong and other problems, to achieve the effect of improving the effect of acid pressure transformation

Inactive Publication Date: 2018-06-12
PETROCHINA CO LTD
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  • Application Information

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the existing acid-etched fracture etching morphology and conductivity test methods cannot quantitatively characterize acid-rock non-uniform etching The relationshi

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  • Acid corrosion crack etching morphology and flow conductivity testing method
  • Acid corrosion crack etching morphology and flow conductivity testing method
  • Acid corrosion crack etching morphology and flow conductivity testing method

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Embodiment 1

[0048] This embodiment provides a method for testing the etching morphology and conductivity of acid-etched cracks, see figure 1 , the method includes the following steps:

[0049] Step 101, preparing a cuboid core sample, and splitting the cuboid core sample into two rock slabs along the length direction of the cuboid core sample to obtain a first rock slab and a second rock slab.

[0050] Step 102, perform three-dimensional laser scanning on the initial shape of the first rock slab and the second rock slab, and obtain the initial elevation values ​​of each point on the fracture surface of the first rock slab and the second rock slab.

[0051] In step 103, the first rock plate and the second rock plate are combined to form a complete core sample, and then the acid displacement and conductivity tests are performed.

[0052] In step 104, three-dimensional laser scanning is performed on the morphology of the first slab and the second slate after acid liquid displacement, and th...

Embodiment 2

[0056] This embodiment provides a method that can quantitatively characterize the relationship between the acid-rock heterogeneous etching form and the conductivity of acid-etched fractures, and can truly simulate the conductivity of tensional acid-etched fractures formed during the actual on-site acid fracturing construction process. The test method of acid-etched crack etching morphology and conductivity during the change process, see figure 1 , including the following steps:

[0057] Step 201, preparing a cuboid core sample, and splitting the cuboid core sample into two rock slabs along the length direction of the cuboid core sample to obtain a first rock slab and a second rock slab.

[0058] The cuboid core sample is obtained by cutting and grinding the full-diameter core, and the six faces of the obtained cuboid core sample should be smooth and flat. Those skilled in the art can understand that the full-diameter cores are collected from formations that need to be tested ...

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Abstract

The invention discloses an acid corrosion crack etching morphology and flow conductivity testing method and belongs to the technical field of oil and gas field well exploitation engineering. The method specifically comprises the following steps: preparing a cuboid rock core sample, and splitting the cuboid rock core sample into two rock plates in a length direction of the cuboid rock core sample;respectively performing three-dimensional laser scanning for initial morphology of the two rock plates, and acquiring initial elevation values of different points of crack surfaces of the two rock plates; performing acid liquid expelling and flow conductivity testing on the complete rock core sample comprising the two rock plates; performing three-dimensional laser scanning on the morphology of the two rock plates after acid liquid expelling, and acquiring elevation values of different points on the crack surfaces of the two rock plates after acid liquid expelling; calculating an initial crackwidth of the rock core sample and a crack width after acid liquid expelling, and respective acid liquid dissolution amounts of the two rock plates. By adopting the method, quantitative representationof acid corrosion crack etching morphology and flow conductivity can be achieved, and the actual acid pressure construction process can be simulated.

Description

technical field [0001] The invention relates to the technical field of oil and gas field well development engineering, in particular to a method for testing the etching form and conductivity of acid-etched fractures. Background technique [0002] At present, acid fracturing is the mainstream technology for stimulation of carbonate reservoirs. During acid fracturing construction, high-pressure pumps inject acid liquid to extend natural fractures or press open formations to form artificial fractures. The injected acid liquid reacts with the rock on the wall of the fracture. Or the protrusion prevents the fracture from closing, and finally forms an artificial fracture with a certain geometric size and conductivity, thereby improving the seepage condition of the oil and gas well and increasing the production of the oil and gas well. The effective length and conductivity of acid-etched fractures are the two main parameters controlling the effect of acid fracturing in carbonate r...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N21/84
CPCG01N15/08G01N15/088G01N21/84
Inventor 刘飞马辉运桑宇周长林王业众赵兴东陈伟华韩慧芬曾嵘王良
Owner PETROCHINA CO LTD
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