Hydrofracturing test system and test method

Abstract

The invention provides a hydrofracturing test system comprising a data collector, a high pressure pump, a flowmeter, an energy accumulator, a pressure sensor, a high pressure pipe and a fracturing part. The fracturing part is installed on a tunnel roof through an installation frame at the bottom of the fracturing part. One end of the high pressure pipe is connected with the energy accumulator. Theenergy accumulator is connected with the data collector and the high pressure pump. The fracturing part comprises a packer, a center rod, a drill rod, a movable plunger and an outer barrel. The movable plunger is arranged in the outer barrel and extends out from the upper end to be connected to the lower end of the drill rod. A movable plunger inner hole communicates with a drill rod inner hole to achieve water inflow. The center rod is connected to the lower portion of the outer barrel and is sleeved with the packer. A fracturing channel comprises a first fracturing channel and a second fracturing channel. The first fracturing channel and the second fracturing channel achieve transition through an arc section, and the caliber of the first fracturing channel is smaller than that of the first fracturing channel. The other end of the high pressure pipe extends into the movable plunger inner hole. The whole pressurization system is good in leakproofness, liquid leakage is avoided, and asingle time of test is easy to operate, short in time, low in cost, high in test success rate and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of coal mine mining, in particular to a hydraulic fracturing test system and a test method for detecting ground stress during coal mine mining. Background technique [0002] In coal mining, in-situ stress is the fundamental force that causes deformation and destruction of surrounding rock and support in coal mine engineering, and produces mine dynamic phenomena. In coal mining, according to the different structural parts and engineering geological conditions of the project, it is necessary to grasp the type of stress state of the rock mass and the characteristics of the stress action of the crust, so as to take reasonable and effective technical measures to prevent mine dynamic phenomena and ensure the relative stability of the roadway. Stable and productive security. At present, the hydraulic fracturing device is mainly aimed at the petroleum field and the coalbed methane development field. When it is used...

AI Technical Summary

Problems solved by technology

At present, the hydraulic fracturing device is mainly aimed at the petroleum field and the coalbed methane development field. When it is used in coal mine mining, facing large rock samples, the single test operation is cumbersome, time-consuming, and costly. Due to its structural limitations, it is very easy to Leakage occurred, causing the test to fail

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