Method for calculating friction coefficient in high-angle natural fracture in stratum
A technology of natural fractures and internal friction, which is applied in the field of calculating the internal friction coefficient of natural fractures with medium and high angles in the formation, and can solve problems such as difficulties in rock samples and failure to meet the engineering requirements for internal friction coefficients
Pending Publication Date: 2022-06-07
SOUTHWEST PETROLEUM UNIV
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However, it is very difficult to obtain rock samples containing natural fracture media, and the reservoir is full of formation fluids
Therefore, the aforementioned experimental test methods cannot meet the engineering requirements for obtaining the internal friction coefficient of the natural fracture wall in the medium containing natural fractures.
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[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0032] A method for calculating the internal friction coefficient of high-angle natural fractures in the stratum of the present invention comprises the following steps:
[0033] A. Interpret or collect the trend of high-angle natural fractures in the formation, the direction of the maximum horizontal principal stress, the maximum horizontal principal stress, the minimum horizontal principal stress, the pore elastic constant and the formation fluid pressure according to the logging data;
[0034] The t...
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The invention discloses a method for calculating a friction coefficient in a high-angle natural fracture in a stratum. The method comprises the following steps: collecting a natural fracture trend, a horizontal maximum principal stress direction, a horizontal maximum principal stress, a horizontal minimum principal stress, a pore elastic constant and a stratum fluid pressure of a natural fractured reservoir; calculating a natural fracture approximation angle; calculating normal stress and shear stress of the natural fracture surface; effective normal stress and effective shear stress in the natural fracture are calculated; and calculating the friction coefficient in the natural fracture. According to the method, the mechanical principle and the strength criterion are applied, and the internal friction angle of the high-angle natural fracture in the rock mass containing the natural fracture medium is obtained through a mathematical method; therefore, the blank of the method for obtaining the friction coefficient in the high-angle natural fracture is filled, and the difficulty of obtaining the related friction coefficient in the natural fracture in the unconventional reservoir volume pressure design in recent years is solved.
Description
technical field [0001] The invention relates to a method for calculating the internal friction coefficient of high-angle natural fractures in a stratum, and belongs to the technical field of volume fracturing exploration and development of unconventional reservoirs. Background technique [0002] The mechanical parameters of rock have very important applications in the field of engineering technology. In the "Standards for Test Methods of Engineering Rock Mass", a recommended method is given for the testing of mechanical parameters of continuum media. The tests for the shear properties of rock mass mainly include triaxial compression test and direct shear test. Liu Jianfeng and Xie Heping invented "A Shear Test Method for Rock Structural Surface and Its Implementing Device" (201210223787), in which the upper and lower parts of the rock sample test block are filled and fixed in the upper and lower opening shear boxes facing each other. , and keep the mouth surfaces of the upp...
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IPC IPC(8): G01V11/00G01N19/02
CPCG01V11/00G01N19/02
Inventor 胡永全吕蓓罗垚胡若菡王荣王强
Owner SOUTHWEST PETROLEUM UNIV