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A simulation test device and method for multi-angle inclined drilling and grouting process of coal seam floor under the action of pressure and dynamic water

A coal seam floor and inclined drilling technology, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc., can solve the problems of difficult control of high-pressure water flow expansion, large number of long boreholes, and difficult sealing, etc., to achieve The effects of solving visualization problems, solving water erosion, and solving sealing problems

Active Publication Date: 2022-02-22
NORTH CHINA INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical research directions of the existing model tests are mostly focused on the crack shape simulation of the floor rock mass, the grout diffusion radius and shape analysis, the three-dimensional and large-scale research of the test bench or test device, and the cost is very high; however, the floor grouting drilling , especially the technological arrangement of multiple grouting holes, the influence of the inclination angle of the borehole on the grouting, and the simulated experimental devices for the coupled grouting of boreholes and fractures are few and almost blank.
The main reason is that there are two problems that are difficult to solve in the experiment: the sealing is difficult when high water pressure is applied, and the expansion of high-pressure water flow and high-pressure slurry in similar materials is difficult to control
In the past, the influence of the inclination angle of the borehole on the grouting process simulation device under the action of confined water was rarely involved. However, in the grouting project, the length of the long borehole is large and the number is large, which can not be ignored.

Method used

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  • A simulation test device and method for multi-angle inclined drilling and grouting process of coal seam floor under the action of pressure and dynamic water
  • A simulation test device and method for multi-angle inclined drilling and grouting process of coal seam floor under the action of pressure and dynamic water

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Experimental program
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Effect test

specific Embodiment approach 1

[0035] Specific implementation mode 1: This implementation mode provides a simulation test device for the multi-angle inclined drilling and grouting process of the coal seam floor under the action of pressure and dynamic water, such as figure 1 with figure 2 As shown, the shown device includes a test bench 1, a water source application device for a confined aquifer, a multi-angle drilling and crack simulation device with different apertures, and a grouting device, wherein:

[0036] The test bench 1 is a metal frame, which can support multi-angle drilling and crack simulation devices with different apertures as a bottom load-bearing body.

[0037] The multi-angle drilling and crack simulation device with different apertures can change the pipe diameter according to the experimental needs to simulate the needs of grouting in cracks of different sizes. According to the drilling angle and crack size, it is divided into multiple groups, which are multiple groups of tubular compone...

specific Embodiment approach 2

[0046] Embodiment 2: In this embodiment, the method of using the device described in Embodiment 1 is introduced by taking the technological process of simultaneous grouting in three different angles of grouting holes as an example.

[0047] The first use requires the assembly of a test bench, a water source application device for a confined aquifer, a multi-angle drilling and fracture simulation device with different apertures, and a grouting device. The drilling angle is determined as required, and the device can simulate three different angles of grouting drilling at one time, such as 90°, 30° and 45°. Connect the experimental device and prepare for the experiment. During the connection process, pay attention to the tightness and avoid air leakage.

[0048] Aquifer simulation: Open the grouting hole selection switches B1, C1, D1, B2, C2, D2, closed crack control valve D, and open open crack control valve E, and close the non-disassembly flushing valve G. Set the water pres...

specific Embodiment approach 3

[0055] Specific implementation mode three: this implementation mode is a further description of specific implementation mode two, and the specific experimental process is as follows:

[0056] 1) Set the threshold of the water pressure regulating valve F, such as 0.6MPa. Close the no-disassembly flushing valve G. Open the open-source crack control valve E, close the crack control valve D, and close the disassembly-free flushing valve G. Open the grouting hole selection switches B1, C1, D1, B2, C2, D2; open the grout flushing valve A1 and the grouting channel valve A2. Start the constant pressure water pump 2 for water injection. When the grout flushing valve A1 has water flowing out, close the grouting channel valve A2. Continue to inject water, and the water pressure increases until the water pressure regulating valve F overflows, and the open-source crack control valve E is closed. When simulating a closed crack, the closed crack control valve D is directly closed.

[00...

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Abstract

The invention discloses a simulation test device and method for the multi-angle inclined drilling and grouting process of coal seam floor under the action of pressure dynamic water. Aperture crack simulation device and grouting device, wherein: the test bench is used to support multi-angle drilling and different aperture crack simulation devices; multi-angle drilling and different aperture crack simulation devices are divided into multiple groups according to the drilling angle and crack size; The water source application device for the confined aquifer includes a constant pressure water pump, water pressure regulating valve, control valve and flow meter for open and closed fissures; the grouting device includes a grouting machine, safety valve, grout flushing valve, grouting channel valve, grouting Orifice selector switch and no-disassembly flush valve. The device of the invention can realize the flow simulation of the grouting process layout, the dynamic process simulation from slurry flow to diffusion, the simulation of the effect of the inclination angle of the borehole on the slurry diffusion, and the scenario simulation of the precipitation and coagulation mechanism.

Description

technical field [0001] The invention relates to a simulated experiment device for porous multi-inclination angle combined grouting technology based on the grouting hole arrangement technology. Background technique [0002] In the process of coal mining, the coal seam is seriously threatened by the confined water in the floor aquifer, and the water inrush coefficient is high. How to prevent the floor from the confined water inrush is an important problem to ensure the safe production of the working face. In particular, some aquifers with sufficient water sources but difficult to drain seriously affect mine production; the key to on-site implementation is often to choose floor grouting projects. At present, the grouting diffusion radius theory is an empirical formula recognized by industry experts, and is widely used in mine grouting engineering. However, the grouting process and grouting mechanism of multiple boreholes in deeper layers still need to be studied. For example,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B33/13
CPCE21B33/13E21B49/00
Inventor 李见波
Owner NORTH CHINA INST OF SCI & TECH
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