Confining pressure hydraulic fracturing experiment device and use method thereof

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...

AI Technical Summary

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 analyze the stress and strain effects. Some assumptions of the design model are not necessarily In line with the actual formation conditions, so the experimental device needs to be further improved

Images