A Quantitative Characterization Method for Roughness of Acid Etched Fractures
A quantitative characterization and roughness technology, applied in image analysis, image enhancement, instruments, etc., can solve problems such as incomplete characterization of fracture surfaces
Active Publication Date: 2020-08-11
SOUTHWEST PETROLEUM UNIV
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However, these parameters are the mean values representing the entire rough fracture surface, and the roughness of the fracture surface is composed of two parts: the large-scale fluctuation wave shape and the small-scale rough heterogeneous body (ISRM.International society for rockmechanics commission on standardization of laboratory and field tests: Suggested methods for the quantitative description of discontinuities in rockmasses[J]. International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstracts, 1978, 15(6): 319–368.), the roughness of the fracture surface has multi-scale effects, Current characterization methods are incomplete for characterization of fracture surfaces
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Embodiment 1
[0047] A method for quantitatively characterizing the roughness of acid-etched cracks according to the present invention, the specific implementation process is as follows:
[0048] S1. Collect the outcrop rocks of the carbonate reservoir section of the Dengying Formation in Sichuan, and use a rock sample cutting machine to make multiple original square slabs of the same size, with dimensions of 178mm in length, 38mm in width, and 60mm in height;
[0049] S2. Use a carving knife to prefabricate scratches in the middle of the original square rock slab along the length of the rock slab, put the pre-scratched square rock slab into the rock slab splitting device; put the rock slab splitting device on the press, start the pressure The machine is slowly pressurized until the prefabricated scratched square rock slab is split into a pair of split rock samples with rough surface morphology;
[0050] S3. Use a 3D laser scanner to scan the upper and lower surfaces of the split rock sampl...
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The invention discloses a quantitative characterization method for roughness of an acid etching crack. The quantitative characterization method comprises the following steps: manufacturing a pluralityof original square rock plates with the same size; acquiring three-dimensional point cloud data by using a three-dimensional laser scanner; obtaining rock plate first-order point cloud data before acid etching and rock plate second-order point cloud data before acid etching through interpolation; calculating the area tortuosity and the average line tortuosity in the length and width directions ofthe rock plate; carrying out an acid etching physical simulation experiment on the split rock sample to obtain a rock plate after acid etching, scanning the rock plate, and calculating the first-order area tortuosity and the second-order area tortuosity of the rock plate and the average line tortuosity of the rock plate in the length direction and the width direction; and quantitatively characterizing the roughness degree of the fracture surface according to the data. According to the quantitative characterization method, the roughness degree change of the rough fracture surface in differentflowing directions and different scales after acid etching can be quantitatively represented, and accurate and reliable basic parameters are provided for researching the flowing rule of the acid liquid in the rough hydraulic fracture, and a basis is provided for researching a real acid etching fracture flow conductivity prediction model.
Description
technical field [0001] The invention relates to a method for quantitatively characterizing the roughness of acid-etched cracks, which belongs to the field of petroleum engineering. Background technique [0002] Acid fracturing is the main measure for stimulation of carbonate rock reservoirs. During construction, the pre-fluid with relatively high viscosity is first squeezed into the reservoir through the wellbore, and high pressure is formed on the bottom-hole reservoir by means of the fracturing fluid. Break open reservoir rock and create frac fractures, or open pre-existing natural fractures. Then inject acid liquid into the fracture to produce non-uniform etching on the surface of the fracture, forming acid-etched fractures with a certain conductivity, providing flow channels for fluids, so as to achieve the purpose of improving oil and gas seepage conditions and increasing oil and gas production. The conductivity of acid-etched fractures is an index to evaluate the flui...
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IPC IPC(8): G06F30/20G06T7/00G06T7/62G06T7/64
CPCG06T7/0002G06T7/62G06T7/64G06T2207/10028
Inventor 陈迟王守信郭建春卢聪王琨刘彧轩赖杰文帝霖钟烨
Owner SOUTHWEST PETROLEUM UNIV