Preparation method of artificial core used for testing fracturing performance of rock containing controllable cracks
An artificial core and fracturing technology, applied in the field of stratum rock laboratory evaluation, can solve the problem of providing rock samples with controllable fractures, and achieve the effects of low cost, easy implementation, and simple operation
Active Publication Date: 2018-04-06
NORTHEAST GASOLINEEUM UNIV
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[0005] An object of the present invention is to provide an artificial core preparation method for rock fracturing performance testing containing controllable fractures. Provide rock samples containing controllable fractures to test the performance of rock fracturing in reservoirs
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Embodiment 1
[0026] combine figure 1 As shown, this artificial core preparation method for testing the fracturing performance of rocks with controllable fractures:
[0027] Preparation of mixed cement slurry: Before making the rock sample, first polish the inner surface of the mold to smooth and apply butter, specifically: first, use a grinder to smooth the inner surfaces of the two outer steel plates 1, two inner steel plates 2 and the base 3, and use The bolts fix the two outer steel plates 1, the two inner steel plates 2 and the base 3, and at the same time apply butter evenly inside them. Using 425# cement, mix cement, water and quartz sand together in a ratio of 2:1:1 to make a cube rock sample with a side length of 300mm, in which the thickness of the polymer sheet is 0.1mm, the length is 3cm, and the width is 2cm.
[0028] When making mixed cement slurry: Stir cement, quartz sand and water together in a ratio of 2:1:1, add water first, then add defoamer, and then cement and quartz ...
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Abstract
The invention relates to a preparation method of an artificial core used for testing the fracturing performance of rock containing controllable cracks. The preparation method of the artificial core used for testing the fracturing performance of the rock containing controllable cracks comprises the steps that mixed cement slurry is prepared; a mould is ground to be smooth and then coated with grease, a steel pipe is inserted into the mould through a central hole of a base, and the bottom of the steel pipe is exposed out of the mould; after a certain amount of mixed cement slurry is slowly poured into the mould, the surface of the mixed cement slurry is flatted, some high molecular slices are arranged on the surface of the mixed cement slurry, after the high molecular slices and the mixed cement slurry are stabilized, mixed cement slurry continues to be poured into the steel pipe, high molecular slices continue to be arranged, and the process is circulated in this way till the mould is filled with the mixed cement slurry; a rock sample obtained after the mixed cement slurry is solidified is formed through grinding, maintained and treated at a high temperature till the high molecularslices are heated to be decomposed into gas, the generated pores are real cracks, and then the artificial core used for testing the fracturing performance of the rock containing the controllable cracks is obtained. The rock sample formed by using the method can truly reflect the basic characteristics of the cracks.
Description
technical field [0001] The invention relates to the technical field of stratum rock laboratory evaluation in the process of oil and gas exploitation, in particular to an artificial core preparation method for testing the fracturing performance of rocks containing controllable fractures. Background technique [0002] At present, hydraulic fracturing is an important technical measure for increasing the production of oil and gas wells and water injection wells. It is not only widely used in low-permeability gas reservoirs, but also has achieved good results in the stimulation of medium and high-permeability oil and gas reservoirs. The research on simulating the characteristics of reservoir hydraulic fracturing has become a hot spot. [0003] For indoor simulation of reservoir hydraulic fracturing characteristics, it is best to use natural rock samples with natural fractures. However, it is difficult to drill natural rock samples containing natural fractures in actual engineeri...
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IPC IPC(8): G01N1/36G01N1/38G01N1/44G01N1/28
CPCG01N1/286G01N1/36G01N1/38G01N1/44G01N2001/366
Inventor 李玮龚小卫李思琪赵欢皮彦夫吴红军
Owner NORTHEAST GASOLINEEUM UNIV
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