An integrated device for water-induced fracturing stress measurement and induced fracture dynamic imaging

Abstract

The invention provides a waterborne fracturing stress measurement and induction fracture dynamic imaging integration device, and belongs to the field of ground stress testing. The waterborne fracturing stress measurement and induction fracture dynamic imaging integration device comprises a fracturing packer, an ultrasonic wave imaging system and a push-pull valve, the ultrasonic wave imaging system is arranged on a flow dividing center rod of the fracturing packer, the ultrasonic wave imaging system and the fracturing packer can descend a well together, and real-time hole wall imaging is achieved, ground stress of a hole wall rock can be rapidly measured, hydraulic fracturing measurement and induction fracture imaging can be achieved only by descending the well once, ground stress measuring efficiency is greatly improved, the ultrasonic wave imaging system dynamically images in real time, and imaging results are more accurate and reliable.

Description

technical field [0001] The invention relates to the technical field of ground stress measurement, in particular to an integrated device for water-induced fracturing stress measurement and dynamic imaging of induced fractures. Background technique [0002] In-situ stress is the initial stress existing in the crustal rock mass, and it is also one of the important physical property parameters of the solid earth. In-situ stress is the root force that causes deformation, instability and destruction of rock mass, and is also an important parameter that affects the exploitation of deep energy such as oil, shale gas, and hot dry rock. Therefore, the measurement of ground stress has important scientific and practical significance in the study of earthquake mechanism, energy exploitation, design of mine tunnels, and construction of large dam foundations. [0003] The most important method for measuring ground stress is hydraulic fracturing. Hydraulic fracturing is a method of determ...

AI Technical Summary

Problems solved by technology

The existing method for obtaining the maximum horizontal principal stress direction is mainly the impression method, that is, using the impression rubber cylinder to imprint the traces of induced cracks on the vulcanized rubber on the surface under high pressure. This method is simple and intuitive, but it also has many shortcomings, mainly as follows: : time-consuming, labor-intensive, inefficient, and only 1-2 test point direction information can be obtained each time the drill is drilled; For large boreholes, since the stress that induces cracks to reopen is also relatively large, it is difficult to clearly print the marks that will induce cracks

The above shortcomings will have a more serious impact on the experimental results when the drilling depth is large and the drilling conditions are complex.

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