Confining pressure hydraulic fracturing experiment device and use method thereof

An experimental device, hydraulic fracturing technology, applied in the direction of earth drilling, mining fluid, measurement, etc., can solve the problems of analysis, inability, and inability to accurately locate cracks, and achieve the effect of avoiding human influence

Inactive Publication Date: 2014-08-27
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

However, there is often a large gap between the predicted fracture extension pressure and the measured value. This is because the technical solution cannot accurately locate the fracture, and cannot

Method used

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  • Confining pressure hydraulic fracturing experiment device and use method thereof

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with accompanying drawing:

[0030] to combine figure 1 , a kind of confining pressure hydraulic fracturing experiment device of the present invention, relates to sample 11, and sample 11 is the coal rock sample of strata; Comprising confining pressure device, the collection device that collects the event relevant information of sample 11 when the event takes place The confining pressure device includes a pressure bearing shaft 1, an end cover 2, a transparent cavity 3 forming a sealed space with the end cover 2, an exhaust valve 4, the first, second, and third water injection valves, a vacuum pump 7, and a pressure transmitter 8 , plunger metering pump 9, third water injection valve 10, copper tube 12; pressure bearing shaft 1 passes through end cover 2 and penetrates into cavity 3, exhaust valve 4 communicates with cavity 3, and one end of copper tube 12 is inserted into the sample In 11, the other ...

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Abstract

The invention discloses a confining pressure hydraulic fracturing experiment device and a use method thereof, and relates to samples. The confining pressure hydraulic fracturing experiment device comprises a confining pressure device and a collecting device, wherein the collecting device is used for collecting information related to events when the events of the samples occur. The confining pressure device comprises a pressure bearing shaft, an end cover, a cavity forming a sealing space with the end cover, an exhaust valve, a first water injection valve, a second water injection valve, a third water injection valve, a vacuum pump, a pressure transmitter, a water pump and a water injection pipe. The collecting device comprises an acoustic emission sensor, a sound receiver, a stress-strain piece and a stress-strain instrument. According to the confining pressure hydraulic fracturing experiment device and the use method thereof, the shortcoming that cracks can not be located in the prior art is overcome, and man-made influence existing in a traditional method based on continuum mechanics is avoided; according to the acoustic emission principle and the stress-strain effect, parameters of the fracturing process can be obtained really, the fracturing position can be located, a series of characteristics of wave forms and frequency released by fracturing can be recorded, and related parameter changing and fracturing laws of hydraulic fracturing of different coal and rock samples under different confining pressure conditions can be simulated.

Description

technical field [0001] The invention relates to a confining pressure hydraulic fracturing experimental device and a using method thereof. Background technique [0002] Hydraulic fracturing technology was first applied in petroleum engineering to increase the production of poor oil wells, and has gradually become one of the most reliable methods for measuring the in-situ stress of deep formations. It has also been used in the development of geothermal resources and the storage of nuclear waste. Therefore, hydraulic fracturing technology has important industrial value and economic benefits. [0003] The fracture pressure in hydraulic fracturing is the fluid pressure at the bottom of the well when the formation produces hydraulic fractures or opens the original fractures, and the fracture pressure gradient refers to the ratio of the fracture pressure to the depth, which is called the fracture pressure gradient. The formation fracture pressure is determined by the downhole pipe...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B47/06E21B47/002
Inventor 成云海马衍坤朱萌萌巩华刚王维德孙建田厚强吴振虎成琦
Owner ANHUI UNIV OF SCI & TECH
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