CN109441441B - Simulation test device and method for coal seam bottom plate multi-angle inclined drilling grouting process under pressure-bearing flowing water action - Google Patents
Simulation test device and method for coal seam bottom plate multi-angle inclined drilling grouting process under pressure-bearing flowing water action Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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Abstract
本发明公开了一种承压动水作用下煤层底板多角度倾斜钻孔注浆工艺模拟试验装置及方法，所述装置包括试验台架、承压含水层水源施加装置、多角度钻孔与不同孔径裂隙模拟装置和注浆装置，其中：试验台架用于支承多角度钻孔和不同孔径裂隙模拟装置；多角度钻孔与不同孔径裂隙模拟装置按照钻孔角度和裂隙大小分为多组；承压含水层水源施加装置包括恒压水泵、水压调节阀门、开源裂隙和封闭裂隙控制阀和流量计；注浆装置包括注浆机、安全阀、浆液冲洗阀、注浆通道阀门、注浆孔选择开关和免拆卸冲洗阀门。本发明的装置可以实现注浆工艺布置流程模拟、浆液流动至扩散的动态过程模拟、钻孔倾角对浆液扩散影响模拟、沉淀和凝结机理的情景模拟。
The invention discloses a multi-angle inclined drilling grouting process simulation test device and method for a coal seam floor under the action of pressurized 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 drilling angle and crack size; Confined aquifer water source application device includes constant pressure water pump, water pressure regulating valve, open source fracture and closed fracture control valve and flow meter; grouting device includes grouting machine, safety valve, slurry flushing valve, grouting channel valve, grouting Orifice selector switch and no-disassembly flush valve. The device of the invention can realize flow simulation of grouting process layout, dynamic process simulation of slurry flow to diffusion, simulation of the influence of borehole inclination on slurry diffusion, and scenario simulation of sedimentation and coagulation mechanism.
Description
Technical Field
The invention relates to a multi-hole multi-inclination combined grouting process simulation experiment device based on a grouting hole arrangement process.
Background
In the coal mining process, the coal seam is seriously threatened by confined water in a bottom plate aquifer, the water inrush coefficient is high, and how to prevent the confined water of the bottom plate from inrush is an important difficult problem of ensuring the safe production of a working face. Particularly, the mine production is seriously influenced by aquifers with sufficient water sources and difficult drainage; the key to the field implementation is often the option of performing a floor grouting project. At present, the slip casting diffusion radius theory is an empirical formula recognized by industry experts and is widely applied to the mine slip casting engineering. However, the grouting process and grouting mechanism of the deeper multiple boreholes still need to be studied. For example, although the floor grouting reinforcement construction is performed according to the high standard, abnormal phenomena such as water discharge from the working face still occur. This has caused significant confusion to both scientific research and field technicians. There is still much room for grouting technology to develop.
At present, the grouting reinforcement engineering of the bottom plate is valued by engineering personnel and science and technology workers, and research means comprise theoretical research, experimental research and field test. In the aspect of model tests, Chinese scholars develop a large amount of research works, but the Chinese scholars have obvious weaknesses. The technical research directions of the existing model test are mostly concentrated on fracture form simulation of a bottom plate rock mass, slurry diffusion radius and form analysis, and three-dimension and large-scale research of a test bed or a test device, so that the cost is very high; however, the simulation experiment device for the bottom plate grouting drilling, particularly the process arrangement of a plurality of grouting holes, the influence of the drilling inclination angle on the grouting and the drilling and fracture coupling grouting is few and almost blank. The main reason is that two problems are difficult to solve in experiments: sealing is difficult when high water pressure is applied, and high pressure water flow and high pressure slurry spread in similar materials are difficult to control. In the past, the influence process simulation device of the drilling hole inclination angle arrangement under the pressure-bearing water effect on grouting is related, and long drilling holes in the grouting engineering are large in length and large in number and have a non-negligible effect.
Disclosure of Invention
The invention aims to provide a multi-angle inclined drilling and grouting process simulation test device and method for a coal bed bottom plate under the action of pressure-bearing running water, which are used for simulating a multi-angle inclined drilling and grouting process flow under the action of pressure-bearing running water of a mine bottom plate, observing a slurry flowing, diffusing and precipitating solidification water plugging mechanism under the real grouting process condition and observing a fluid action rule when the slurry and water flow interact to generate convection and cocurrent flow in the grouting process.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a coal seam bottom plate multi-angle inclined drilling slip casting process analogue test device under pressure-bearing flowing water effect, exerts device, multi-angle drilling and different aperture crack analogue means and slip casting device including test bench, pressure-bearing aquifer water source, wherein:
the test bed is used for supporting the multi-angle drilling and different-aperture fracture simulation devices;
the multi-angle drilling and different-aperture fracture simulation device is divided into a plurality of groups according to the drilling angle and the fracture size and is a combined structure of a plurality of groups of tubular members, and each group of tubular members comprises an organic glass tube A for simulating the fracture and an organic glass tube B for simulating the drilling;
the confined aquifer water source applying device comprises a constant-pressure water pump, a water pressure regulating valve, an open source crack and closed crack control valve and a flowmeter;
the grouting device comprises a grouting machine, a safety valve (a grouting machine protection valve), a slurry flushing valve, a grouting channel valve, a grouting hole selection switch and a disassembly-free flushing valve;
one end of the organic glass tube A is connected with one end of the organic glass tube B through an elbow, and the other end of the organic glass tube A is connected with a constant-pressure water pump through a water source pipeline;
a water source pipeline between the organic glass pipe A and the constant pressure water pump is sequentially provided with a disassembly-free flushing valve, a closed crack control valve, a water pressure regulating valve and an open source crack control valve;
a branch pipeline is arranged on a water source pipeline between the open source crack control valve and the closed crack control valve, a water pressure regulating valve is arranged on the branch pipeline, and the water pressure regulating valve is connected with a flowmeter through a pipeline;
the other end of the organic glass tube B is connected with a grouting channel valve through an elbow and a pipeline;
the grouting machine is sequentially connected with a safety valve (a grouting machine protection valve), a slurry flushing valve and a grouting channel valve through pipelines;
and the sides of the organic glass pipe A, which are close to the constant-pressure water pump, and the organic glass pipe B, which is close to the grouting machine, are provided with grouting hole selection switches.
A method for realizing the simulation of the coal seam floor multi-angle inclined drilling grouting process by grouting in an open source fracture by using the device comprises the following steps:
firstly, determining a drilling angle, a fracture aperture and the number of groups of simulation devices according to experimental requirements;
secondly, simulating an aquifer: (1) opening a grouting hole selection switch, an open source crack control valve and a closed crack control valve, and closing a disassembly-free flushing valve; (2) setting the value of a water pressure regulating valve as required, opening a slurry flushing valve and a grouting channel valve, and starting a constant-pressure water pump to inject water; (3) when water flow overflows from the slurry flushing valve, closing the grouting channel valve; (4) continuously increasing the water pressure until the water pressure regulating valve is opened, and closing the source-opening crack control valve;
thirdly, grouting simulation: (1) setting a water pressure regulating valve according to requirements; (2) the slurry flushing valve is in a cleaning mode, and a grouting machine is started for grouting; (3) when the slurry flows out of the slurry flushing valve, the slurry flushing valve is closed, the grouting channel valve is quickly opened, grouting is started, and relevant data are recorded and collected for experimental analysis; (4) after the grouting process is finished, standing for a period of time, after the slurry in the organic glass tube A for simulating the crack is precipitated and solidified, no obvious slurry diffusion precipitation occurs, recording an experimental phenomenon in the experimental process, and finishing the collection of data; (5) when the slurry is solidified to a certain degree, carrying out grouting effect inspection; (6) and after the final test is finished, opening the slurry flushing valve to flush the grouting machine, opening the disassembly-free flushing valve after the water flow flowing out of the slurry flushing valve is clear, and closing the slurry flushing valve to flush the grouting pipeline after the grouting machine is flushed.
A method for realizing the simulation of the coal seam floor multi-angle inclined drilling grouting process by grouting in a closed crack by using the device comprises the following steps:
firstly, determining the drilling angle, the fracture aperture and the number of groups of simulation devices according to experimental requirements;
secondly, simulating an aquifer: (1) opening a grouting hole selection switch, an open source crack control valve and a closed crack control valve, and closing a disassembly-free flushing valve; (2) setting the value of a water pressure regulating valve as required, opening a slurry flushing valve and a grouting channel valve, and starting a constant-pressure water pump to inject water; (3) when water flow overflows from the crack selection valve, closing the grouting channel valve; (4) increasing the water pressure until the water pressure regulating valve is opened, and closing the closed crack control valve;
thirdly, grouting simulation: (1) setting a water pressure regulating valve according to requirements; (2) the slurry flushing valve is in a cleaning mode, and a grouting machine is started for grouting; (3) when the slurry flows out of the slurry flushing valve, the slurry flushing valve is closed, the grouting channel valve is quickly opened, grouting is started, and relevant data are recorded and collected for experimental analysis; (4) after the grouting process is finished, standing for a period of time, after the slurry in the organic glass tube A for simulating the crack is precipitated and solidified, no obvious slurry diffusion precipitation occurs, recording an experimental phenomenon in the experimental process, and finishing the collection of data; (5) when the slurry is solidified to a certain degree, carrying out grouting effect inspection; (6) and after the final test is finished, opening the slurry flushing valve to flush the grouting machine, opening the disassembly-free flushing valve after the water flow flowing out of the slurry flushing valve is clear, and closing the slurry flushing valve to flush the grouting pipeline after the grouting machine is flushed.
Compared with the prior art, the invention has the following advantages:
1. the device can simulate the arrangement of the coal seam floor multi-angle inclined drilling process, demonstrate the grouting effect of the coal seam floor inclined drilling grouting process, clarify the unique characteristics of the drilling in the grouting and water plugging process, and explain the coupling mechanism of slurry and water flow.
2. And simulating the underground water flowing state of the mine. Simulating two conditions of drainage and non-drainage to realize the simulation of the confined aquifer condition of the open source crack and the closed crack.
3. The situation type drilling grouting process flow simulation considers the influence of the drilling inclination angle on slurry diffusion, deposition and condensation, is transparent in the whole process, facilitates observation of the flowing condition of the slurry in the aquifer, realizes the live-action simulation of the underground grouting engineering, clearly observes the grouting process flow, is beneficial to the optimization of the grouting process flow, solves the visualization problem, and visualizes the abstract scientific problem.
4. The simulation device can simulate a real underground aquifer, grouting holes with different angles and cracks with different apertures.
5. The high-pressure pipeline solves the sealing problem; the cracks are simplified, the interaction of the slurry and the water flow under the action of high pressure is emphasized, and the problem of water flow scouring under the action of high water pressure is solved.
Drawings
FIG. 1 is a plan view of a simulation test device for a coal seam bottom plate multi-angle inclined drilling grouting process under the action of pressure-bearing running water, wherein:
、
、
representing grouting channels or pipelines with three different inclination angles; l represents the length of a grouting pipeline, and 3m and 4m can be taken in the experiment;
FIG. 2 is a side view of FIG. 1;
in the figure: 1-test bed, 2-constant pressure water pump, 3-flowmeter, 4-slip casting machine, 5-slide rail and selfie stick.
Detailed Description
The technical solutions of the present invention are further described below with reference to the drawings, but the present invention is not limited thereto, and modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention.
The first embodiment is as follows: this embodiment provides a coal seam bottom plate multi-angle slope drilling slip casting process simulation test device under pressure-bearing flowing water effect, as shown in fig. 1 and fig. 2, shown device includes that test bench 1, pressure-bearing aquifer water source exert device, multi-angle drilling and different aperture crack analogue means, slip casting device, wherein:
the test bed 1 is a metal frame and can support a multi-angle drilling and different-aperture fracture simulation device as a bottom bearing body.
The multi-angle drilling and different-aperture fracture simulation device can change the pipe diameter according to the experimental requirements to simulate the requirement of grouting in fractures of different sizes, and is divided into a plurality of groups according to the drilling angle and the fracture size, and is a combined structure of a plurality of groups of tubular members. Each set of tubular members comprises an organic glass tube A for simulating a crack and an organic glass tube B for simulating a drilled hole, and the organic glass tube B for simulating a drilled hole can be angularly adjusted. According to the needs, the oblique section of organic glass pipe B for simulating drilling all has two, and one is close to slip casting pipe side, and another is close to the crack side, and two turnings all are connected by the elbow. No matter be the drilling and make oblique section or organic glass pipe straightway all can bear certain water under high pressure, can be visual moreover. The multi-angle drilling and different-aperture crack simulation device simulates through organic glass tubes with different tube diameters.
The confined aquifer water source applying device can simulate two conditions of source opening cracks and closed cracks and comprises a constant-pressure water pump 2, a source opening crack control valve E, a closed crack control valve D, a water pressure regulating valve F and a flow meter 3. The open source crack control valve E can be closed or opened to simulate the drainage condition of the aquifer so as to meet the experimental requirements and realize the grouting simulation in the open source crack. The constant pressure water pump 2 and the water pressure regulating valve F can set the water pressure of the aquifer and can ensure that the water source is sufficient. The closed crack control valve D can simulate the non-drainage condition in an experiment to realize grouting simulation in the closed crack. The flowmeter 3 can record the overflow amount of water flow in a water-bearing stratum under the action of slurry and water flow in the grouting process, namely the replacement condition of the slurry and the water flow, and is used for research.
The grouting device comprises a grouting machine 4, a safety valve A3, a slurry flushing valve A1, a grouting channel valve A2, a grouting hole selection switch (B1, C1, D1, B2, C2 and D2) and a disassembly-free flushing valve G. The grouting machine 4 is provided with a pressure gauge, and the grouting machine 4, the pressure gauge and the safety valve A3 can apply the slurry pressure and the slurry required by the experiment through the three parts. Slurry flushing valve A1 and pipeline flushing valve G can be after the experiment is accomplished, can need not dismantle slip casting machine and pipeline circuit, and slip casting machine 4 carries out the automatic washing to be ready for the experiment needs next time. The grouting hole selection switches (B1, C1, D1, B2, C2 and D2) can select the type of the crack required by one experiment. The grouting passage valve A2 can control the start and stop of grouting. The grouting hole selection switches (B1, C1, D1, B2, C2, D2) can select which hole to use for grouting. The disassembly-free flushing valve G is not required to be disassembled after the experiment is finished, the disassembly-free flushing valve G is opened, and the grouting machine 4 automatically cleans the pipeline.
One end of the organic glass tube A is connected with one end of the organic glass tube B through an elbow, and the other end of the organic glass tube A is connected with the constant-pressure water pump 2 through a water source pipeline; a disassembly-free flushing valve G, a closed crack control valve D, a water pressure regulating valve F and an open source crack control valve E are sequentially arranged on a water source pipeline between the organic glass pipe A and the constant pressure water pump 2; a branch pipeline is arranged on a water source pipeline between the open source crack control valve E and the closed crack control valve D, a water pressure regulating valve F is installed on the branch pipeline, and the water pressure regulating valve F is connected with the flowmeter 3 through a pipeline; the other end of the organic glass tube B is connected with a grouting channel valve A2 through an elbow and a pipeline; the grouting machine 4 is sequentially connected with a safety valve A3, a slurry flushing valve A1 and a grouting channel valve A2 through pipelines; and the side of the organic glass pipe A close to the constant-pressure water pump 2 and the side of the organic glass pipe B close to the grouting machine 4 are both provided with grouting hole selection switches.
The simulation experiment device of the embodiment can realize the simulation of the arrangement flow of the grouting process, the simulation of the dynamic process from slurry flowing to diffusion, the simulation of the influence of the drilling inclination angle on the slurry diffusion, and the scene simulation of the precipitation and coagulation mechanisms, clearly illustrates the diffusion, precipitation and coagulation water plugging mechanisms of the slurry during the inclined drilling grouting at a plurality of different angles under the action of high-pressure water, and solves the following four technical problems:
a. simulating the action mechanism of slurry sedimentation, diffusion and solidification water plugging in the grouting engineering by the inclined drilling hole;
b. the influence of inclined drill holes with different angles on slurry diffusion deposition water plugging and difference simulation caused by the inclined angles are realized;
c. simulating inclined drilling and grouting under the drainage condition and the non-drainage condition, and simulating a slurry diffusion mechanism and a slurry and water flow coupling action mechanism in the crack;
d. the whole process of the grouting process is visualized, and the disassembly-free semi-automatic cleaning can be realized.
The second embodiment is as follows: the present embodiment describes a method for using the device according to the first embodiment by taking a process flow of simultaneous grouting through three grouting holes at different angles as an example.
The test bed, the confined aquifer water source applying device, the multi-angle drilling and different-aperture fracture simulating device and the grouting device are required to be assembled in the first use. According to the requirement for determining the drilling angle, the device can simulate grouting drilling at three different angles at a time, such as 90 degrees, 30 degrees and 45 degrees. The experimental set was connected and ready for the experiment. In the connection process, attention is paid to the sealing property, and the phenomenon of air leakage cannot occur.
Simulation of an aquifer: and opening grouting hole selection switches B1, C1, D1, B2, C2 and D2, a closed crack control valve D and an open source crack control valve E, and closing the disassembly-free flushing valve G. And setting a water pressure regulating valve F as required, and starting the constant pressure water pump 2 to inject water. When the water flow overflows from the slurry flushing valve a1, the grouting channel valve a2 is closed. Note that at this time, if the open source fracture grouting is simulated, the closed fracture control valve D is kept open; and if simulating the grouting of the closed crack, closing the closed crack control valve D. Checking the pipeline to determine whether water leakage occurs. If water leakage exists, the water pressure is removed, and the connection is carried out again; if intact, the test is continued.
Grouting simulation: and setting a water pressure regulating valve F as required, and starting the grouting machine 4 to perform grouting. When the slurry flushing valve A1 has the slurry flowing out, the slurry flushing valve A1 is closed, the grouting channel valve A2 is opened to the grouting mode, and grouting is started. Grouting according to the steps under the conditions of the open source crack and the closed crack.
And setting grouting time according to specific conditions and research purposes on site. And recording and collecting relevant data for experimental analysis.
After the grouting process is finished, standing for a period of time t, and after the slurry is precipitated and solidified, no obvious slurry diffusion and precipitation occurs any more, and the slurry is preferably in a semi-solidified state. And recording experimental phenomena in the experiment to finish data collection.
When the slurry is solidified to a certain degree, a grouting effect verification test can be carried out. Grouting effect verification experiment process: the borehole is kept open at any angle (such as the inclination angle is 45 degrees), and the rest pipelines are closed (for example, the grouting hole selector switches D1 and D2 are opened, the grouting hole selector switches B1 and B2 and C1 and C2. are closed, and the closed crack control valve D, the open source crack control valve E and the grouting channel valve A2 are opened). And (4) opening a water injection pump, pressurizing water injection, and recording the water pressure value when the slurry deposition plunger section is penetrated and passed by water flow. The drilling of every angle all needs the record, and the water pressure value that three kinds of different angle drilling were gathered compares, can the understanding slip casting effect directly perceived.
After the final test is completed, the slurry flush valve a1 is opened to flush the grouting machine 4. And after the water flow at the grout flushing valve A1 is clear and the grouting machine is cleaned, opening the disassembly-free flushing valve G and closing the grout flushing valve A1 to flush the grouting pipeline.
And controlling a high water pressure boundary simulation device. At the beginning of the test, a hydraulic pressure regulating valve F (for example, 0.6 MPa) is set, and a grouting side valve is opened: a slurry flushing valve (three-way valve) A1 and a grouting channel valve A2 are opened, a constant pressure water pump 2 is started to inject water, and the water pressure is kept constant (for example, 0.6 MPa). When the hole is full of water, water flows out of the slurry flushing valve A1, the grouting channel valve A2 is closed, water is continuously injected, and the water pressure adjusting valve F is kept for 5s until water flows out. At this time, if the open source fracture condition is simulated, the open source fracture control valve E is closed; and if the condition of the closed crack is simulated, closing the closed crack control valve D. Stopping water injection, calibrating the reading of the pressure gauge and recording.
The third concrete implementation mode: the second embodiment is further described in the present embodiment, and the specific experimental process is as follows:
1) the threshold value of the hydraulic pressure regulating valve F is set, for example, 0.6 MPa. The non-removable flush valve G is closed. Opening the open source crack control valve E, closing the crack control valve D and closing the disassembly-free flushing valve G. Opening grouting hole selection switches B1, C1, D1, B2, C2 and D2; slurry flush valve a1 and grouting channel valve a2 were opened. And starting the constant pressure water pump 2 to inject water. When the slurry flushing valve A1 has water flowing out, the grouting channel valve A2 is closed. And (4) continuing to inject water, increasing the water pressure until water flows overflow from the water pressure regulating valve F, and closing the open source crack control valve E. And when the closed crack is simulated, directly closing the closed crack control valve D.
2) And (5) preparing grouting. The grouting machine 4 is started, when the slurry flushing valve A1 has slurry flowing out, the slurry flushing valve A1 valve is closed, and grouting is prepared.
3) And (6) grouting. And opening a grouting channel valve A2 to start grouting, and beginning to diffuse the grout into the grouting hole. And (5) continuously increasing the pressure, and observing a pressure gauge on the grouting machine 4. Along with the pressure increase, the thick liquid constantly diffuses, wait for several seconds when reaching overflow valve set value 0.6MPa, water pressure regulating valve F has rivers to overflow, and flowmeter 3 records discharge, compares with the slip casting volume.
4) And observing the diffusion distance of the slurry in the horizontal organic glass tube simulating the crack, standing for a period of time. The thick liquid presents continuous deposit, waits until the thick liquid no longer has obvious deposit, utilizes the slide, takes a photo from rapping bar and high definition camera, records the slip casting information.
5) When the slurry is solidified to a certain degree, a grouting effect verification test can be carried out. Grouting effect verification experiment process: the borehole is kept open at any angle (such as the inclination angle is 45 degrees), and the rest pipelines are closed (for example, the grouting hole selector switches D1 and D2 are opened, the grouting hole selector switches B1 and B2 and C1 and C2. are closed, and the closed crack control valve D, the open source crack control valve E and the grouting channel valve A2 are opened). And (4) opening the grouting machine 4, pressurizing and injecting water, and recording the water pressure value when water flows pass through the slurry deposition plunger section. The drilling of every angle all needs the record, and the water pressure value that three kinds of different angle drilling were gathered compares, can the understanding slip casting effect directly perceived.
6) The slurry flush valve a1 is opened to flush the slip casting machine 4. And (5) waiting for the water flow at the grout flushing valve A1 to be clear, opening the disassembly-free flushing valve G, and closing the grout flushing valve A1 to flush the grouting pipeline.
The experimental results are as follows:
(1) the grouting mechanism is clarified, and different forms of grouting situations are compared. Generally, under the same conditions, the larger the drilling angle is, the firmer the plunger section formed by slurry deposition is, and the better the grouting effect is.
(2) And (3) verifying the water plugging effect: water flooding experiments were conducted until the slurry had solidified to some extent (a semi-solidified state was selected as an example herein). A group of experiments are selected to briefly explain the grouting effect and the water plugging mechanism, and only experimental explanation is carried out, for example, a certain water-cement ratio k is taken, and under the condition that the water-cement ratio k is solidified to a certain degree according to the experiment requirement, the water pressure value of the water flow penetrating through the slurry deposition plunger section is recorded during the pressurization water injection effect inspection. Under other similar boundary conditions:
(a) drilling holes at an inclination angle of 30 degrees, and recording the water pressure value of water flow penetrating through a slurry deposition plunger section as p 1;
(b) drilling holes at an inclination angle of 45 degrees, and recording the water pressure value of water flow penetrating through a slurry deposition plunger section as p 2;
(c) the hole was drilled at an angle of 90 ° and the water pressure value of the water stream permeating through the slurry settling plug section was recorded as p 3.
The experimental results are as follows: p3 > p2 > p 1.
Claims (4)
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