Lab simulation testing device for staged fracturing of horizontal well, and operation method for same

Abstract

The invention discloses a lab simulation testing device for staged fracturing of a horizontal well, and an operation method for the same and solves the problems of existing hydraulic fracturing tests,that operations are complicated, flexibility is low, and accuracy is not high; the structure is simple and operations are convenient; testing cost can be effectively reduced; testing efficiency can be increased; and testing conditions are provided for research on crack expansion mechanisms of staged fracturing of the horizontal well. The technical solution is characterized in that the device comprises a tri-axial loading unit, a fracturing control unit and a hydraulic loading unit, wherein the tri-axial loading unit comprises a testing frame and a loading cylinder which is installed on the inner side of the testing frame and can provide three-directional axial pressures; the fracturing control unit comprises a shaft sleeve, a liquid injection screw rod, a pressure bearing plate and a connecting base; two ends of the shaft sleeve are in threaded connection to a liquid injection screw rod respectively, and the liquid injection screw rods penetrate the pressure bearing plate and are connected to the connecting base to form a liquid injection channel; and the hydraulic loading unit can pump a fracturing liquid into the simulation horizontal well.

Description

technical field [0001] The invention relates to the field of hydraulic fracturing theory and technical research, in particular to an indoor simulation test device for staged fracturing of a horizontal well and an operating method thereof. Background technique [0002] Staged fracturing of horizontal wells is a hydraulic fracturing technology widely used in shale gas development. The intricate fracture network can achieve the purpose of increasing shale gas production. Previous research and practice have shown that factors such as staged fracturing methods, formation stress field distribution characteristics, and perforation spacing directly affect the overall effect of hydraulic fracturing. [0003] In actual engineering, due to the large burial depth of shale reservoirs and the extremely complex stress field distribution, it is usually difficult to directly evaluate the fracturing effect. Therefore, most scholars at home and abroad use laboratory test methods to carry out...

AI Technical Summary

Problems solved by technology

However, the inventors found that the existing test devices are mainly used for conventional hydraulic fracturing tests, while true triaxial simulation test devices for horizontal well staged fracturing are relatively rare

At the same time, the existing devices often use multiple injection pipes to control the staged fracturing of the wellbore. The operation is complicated, and it is extremely difficult to adjust the perforation spacing and number. When studying multi-perforation conditions, the wellbore size is usually large, and then Affect the test accuracy

In addition, the fracturing methods of existing devices are single and inflexible, and multiple fracturing methods such as sequential fracturing, staggered fracturing, and simultaneous fracturing of multi-stage single-cluster fractures and multi-stage multi-cluster fractures cannot be realized in a single wellbore. It is difficult to provide strong support for the research on the mechanism and technology of horizontal well staged fracturing

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