A Quantitative Evaluation Method of Roughness Change of Rough Fractures After Acid Etching
A roughness, quantitative evaluation technology, applied in the direction of measuring devices, earthwork drilling, wellbore/well components, etc., can solve the problem of affecting the acid erosion conductivity of rough fractures, predicting the accuracy of the acid fracturing project plan, and the roughness change is not clear And other issues
Active Publication Date: 2019-04-26
SOUTHWEST PETROLEUM UNIV
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However, there is currently a lack of a method for quantitatively evaluating the change in roughness of rough fractures after acid etching, resulting in unclear changes in roughness of rough hydraulic fractures before and after acid etching, which directly affects the prediction of the conductivity of rough fractures in acid etching and the design of acid fracturing projects. the accuracy of
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Embodiment 1
[0062] A method for quantitatively evaluating the change in roughness of rough cracks after acid etching, the specific process is as follows:
[0063] (1) Laser scanning the rough rock slab before acid etching to obtain 3D data of rough fracture morphology and remove noise data, and then calculate the two-dimensional fractal dimension of the fracture surface before acid etching.
[0064] Using a rough rock sample from a formation in the Sichuan Basin, the length of the rock sample is 175mm, and the width is 34mm. Laser scanning is performed on the rough rock slab before acid etching to obtain 3D data of rough fracture morphology, and then 3D imaging software is used to remove noise. . The appearance of the rock sample before and after removing the noise is as follows: image 3 shown; according to formula (1) and formula (2), calculate the average fractal dimension of slabs 1 and 2 in the length direction (x direction) of slabs before acid etching and the average fractal dim...
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The invention discloses a roughness change quantitative evaluation method of a rough crack after acid etch; the method comprises the following steps: 1, laser-scanning a rough rock board before acid etch so as to obtain rough crack morphology 3D data and eliminating noisy point data, and calculating a 2D fractal dimension of a crack surface before the acid etch; 2, carrying out an acid etch physical simulation test for the rough rock board in step 1, and using a laser scanner to obtain the crack morphology 3D data after the acid etch and eliminating noisy point data, and calculating a 2D fractal dimension of the crack surface after the acid etch; 3, determining the roughness changes after the rough hydraulic crack acid etch according to the variations of the crack surface fractal dimensionbefore and after the acid etch in step 1 and step 2. The method can quantitatively express the roughness changes in different acid liquid flow directions after the rough hydraulic crack acid etch, thus providing accurate and reliable basic parameters and theoretic basis for studying flow rules of the acid liquid in the rough hydraulic cracks.
Description
technical field [0001] The invention relates to the field of petroleum engineering, in particular to a method for quantitatively evaluating the roughness change of rough fractures after acid etching in the acid fracturing stimulation process of carbonate rock oil and gas reservoirs. technical background [0002] Acid fracturing is one of the trump card technologies for the construction and production increase of carbonate oil and gas reservoirs. During on-site construction, viscous prefluid (such as fracturing fluid) is usually used to create fractures first, that is, to form hydraulic fractures, and then inject acid liquid; The liquid flows along the hydraulic fractures. Due to the tortuous flow channel and the strong heterogeneity of the carbonate rock, the acid liquid reacts with the rock on the wall of the fracture in a non-uniform chemical dissolution reaction, making the acid-etched fractures more complicated; Under the action of pressure, the undissolved area acts as ...
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IPC IPC(8): G01B11/30E21B49/00
CPCE21B49/00G01B11/306
Inventor 苟波郭建春
Owner SOUTHWEST PETROLEUM UNIV