CN105372410B - Double-end sealing leak detection combined geometry - Google Patents

Abstract

The invention discloses an integrated observation system for double-end plugging and leak detection, which belongs to the technical field of measuring the damage range of rock mass on the roof and floor of mines. It includes a plugging system, a guiding system, a supply propulsion system and a pressure conversion system. The plugging system includes a connecting pipe, a first plugging unit and a second plugging unit located at both ends of the connecting pipe. The first plugging unit is close to the rock mass drill. On the inner side of the hole, the plugging unit includes a leaking pipe, a tubular joint connected to both ends of the leaking pipe and a sealing capsule, the sealing unit and the connecting pipe are connected by a tubular joint, and the sealing capsule is arranged on the periphery of the leaking pipe of the two tubular joints. A certain blocking space is formed between the blocking capsule and the leaking pipe. Through the cooperation of the plugging system and the pressure conversion system, the present invention realizes the pressure conversion from the plugged water source to the observed water source in the integration process, solves the problem that the blocked water source and the observed water source work under their respective pressures during the observation process, and avoids the observation of the water source The destructive effect of excessive pressure on drilling cracks.

Description

Double-end plugging leak detection integrated observation system

technical field

The invention relates to the technical field of measuring the damage range of rock mass on the roof and floor of mines, in particular to an integrated observation system for double-end plugging and leak detection.

Background technique

The measurement of the damage range of rock mass on the roof and floor of mine is an important parameter to indicate the occurrence state of coal rock. It is a key basic parameter in the study of mine water prevention and control. Therefore, to study the formation of water-conducting channels in mining surrounding rocks, it is necessary to grasp the movement rules of rock strata and determine the damage range of roof and floor rock mass. Numerical simulation, empirical formula prediction, field measurement and other methods are usually used.

However, due to the complex site conditions, to a certain extent, the numerical simulation cannot reflect the site conditions well, and the blindness of the empirical formula is relatively large. As the mining depth increases, the applicability of the empirical formula becomes worse and worse. Due to the excessive number of pipelines working at the same time in the existing observation equipment, especially during the propulsion process, the problem of pipeline entanglement in the borehole is prone to occur. In addition, in the actual observation process, the plugging pressure is generally taken as 2.5 MPa, and the borehole observation water The pressure is generally taken as 0.1MPa, and the pressure of the water source observed in the borehole should not be too high, otherwise, it will cause expansion of the original cracks in the borehole wall. Under the same external water source, how to make the blocked water source and the observed water source in the integrated observation equipment work at the same time under their respective pressures, the existing technology fails to solve the above two problems at the same time.

Contents of the invention

The purpose of the present invention is to provide an integrated observation system for double-end plugging and leak detection, which can realize the integration of plugging and leak detection at the same time, reduce the number of pipelines working simultaneously in the borehole, and can complete plugging and leak detection Integrate and block the high-pressure water source to observe the pressure conversion of the low-pressure water source.

Its technical solutions include:

An integrated observation system for plugging and leak detection for mine roof and floor rock mass, which includes a plugging system, a guiding system, a supply propulsion system and a pressure conversion system;

The sealing system includes a communication pipe, a first sealing unit and a second sealing unit located at both ends of the communication pipe, the first sealing unit is close to the inner side of the rock mass drilling, and the sealing unit includes a water leakage pipe, Tubular joints and plugging capsules connected to both ends of the leaking pipe, the plugging unit and the communication pipe are connected through the tubular joints, the sealing capsules are arranged on the periphery of the leaking pipes of the two tubular joints, the sealing capsules are connected with the A certain sealing space is formed between the leaking pipes;

The pressure conversion system includes a hydraulic pressure converter and a slotted pipe joint, the hydraulic pressure converter is connected to the tubular joint at the tail of the first sealing unit through the slotted pipe joint, and the hydraulic pressure converter includes a piston and the two parts of the base body, the area of the left end face of the piston is greater than the area of the right end face, the piston is provided with interconnected water guide holes, and the water guide holes at the right end communicate with the card groove pipe joint through small holes, The water guide hole at the left end is initially sealed by the inner wall of the matrix, and a boss is provided at the right end of the piston. The boss is used to limit the position of the spring in the piston, and the piston is used to control the water guide hole at the left end and the surrounding rock. Boreholes in remain connected or closed;

The guiding system includes a guiding cone connected to a tubular joint at the head of the first blocking unit;

The supply propulsion system communicates with the communication pipe, and is used for injecting water into the communication pipe, displaying and recording various parameters.

The beneficial technical effect that above-mentioned technical scheme directly brings is:

The piston is a cylinder with different sizes at the left and right ends. The piston surface area of the larger cylinder at the left end is _outside S, and the contact water pressure is P _outside ; the piston surface area of the smaller cylinder at the right end is S _inside , and the contact water pressure is P _inside . There is a boss set near the right end of the piston, and the spring cooperates with the corresponding part inside the matrix to ensure that the piston will not break away from the matrix while moving in the matrix. There are interconnected water guide holes in the piston. The water guide hole at the right end is connected with the card groove pipe joint through a small hole. The water guide hole at the left end is sealed by the inner wall of the base at the beginning. , the water guide hole at the left end communicates with the borehole.

The working principle of the water pressure converter is:

The surface area of the larger cylinder piston at the left end is _outside S, and the contact water pressure is _outside the water pressure P observed in the borehole; the surface area of the smaller cylinder piston at the right end is _inside S, the contact water pressure is _inside P, and the elastic coefficient in the spring is k , the amount of compression x, we can know from the principle of two-force balance:

When F _outer + F _bomb ≥ F _inner , that is, P _outer S _outer + kx ≥ P _inner S _inner , the hydraulic pressure converter is in the closed state, the piston does not move outward, and the water guide hole is blocked by the inner wall of the matrix and cannot communicate with the drill hole .

When F _outside + F _bomb F ≤ F _inside , that is, P _outside S _outside + kx ≤ P _inside S _inside , the hydraulic pressure converter is in the open state, the piston moves outward, and the water guide hole exposes the inner wall of the matrix and communicates with the drill hole. Fill the borehole with water.

The above process can not only realize the conversion from the internal measurement (referring to the plugging capsule) to block the high-pressure water (generally 2.5MPa) to the outside (referring to the borehole) to observe the low-pressure water (0.1MPa), but also realize the real-time monitoring in the borehole according to the needs. Hydration process.

Among them, _{the outside} of P is the observed water pressure, which is usually taken as 0.1MPa in engineering, and _{the inside} of P is the water pressure of the swelling and sealing capsule in the sealing system, which is usually taken as 2.5MPa in engineering. It can be seen that the ratio of _outside S _{to inside} S is about 10～25:1, considering that the difference in area is too large, a spring is added for adjustment. First, the ratio of internal and external areas can be reduced, which is convenient for actual manufacturing needs. Second, the piston can automatically return to its position.

As a preferred solution of the present invention, the tubular joint is provided with vertically upward and vertically downward protrusions, and the blocking capsule is wound around the periphery of the leaking pipe of the two protrusions.

As another preferred solution of the present invention, a groove is provided on the tubular joint on one side of the leaking pipe at a certain distance from the protrusion, and the groove fixes the sealing capsule by cooperating with the fixing member.

Preferably, two leak holes are evenly arranged on each section of the leak pipe.

Preferably, the connecting pipe and the tubular joint are threaded.

Preferably, when the piston satisfies _PouterSouter + _{kx≤PinnerSinner} , the water guide hole at the left end is connected to the drilling hole in the surrounding rock, wherein, _Pouter is the observed water pressure, _and Pinner _is the swelling _in the sealing system The water pressure of the plugging capsule, _{the outside} of S is the area of the piston surface of the left end, _{the inside} of S is the area of the piston surface of the right end, k is the elastic coefficient of the spring, and x is the compression amount.

Preferably, said P _inside is 2.5 MPa.

Preferably, the supply propulsion system includes a water injection console, a return water pressure gauge, an electronic recorder, a drilling rig and a drill pipe, the water injection console provides a high-pressure water source to the connecting pipe, and the electronic recorder is installed with a water injection console Above, the return water pressure gauge is used to correct and detect the return water pressure in the return water pipe.

Preferably, the ratio of the area of the left end surface of the piston to the area of the right end surface is 10-25:1.

Compared with the prior art, the beneficial technical effects of the system are:

1. Realized the integration of plugging and leak detection of the observation system, reduced the number of pipelines working at the same time in the borehole, and solved the problem of multi-pipeline entanglement in the borehole during the advancement process.

2. Through the cooperation of the plugging system and the pressure conversion system, the pressure conversion from the plugged water source to the observed water source is realized in the integration process, which solves the problem that the blocked water source and the observed water source work under their respective pressures during the observation process, and avoids the observation of the water source The destructive effect of excessive pressure on drilling cracks.

3. Improve the stability and accuracy of the measurement process of the damage range of the mine roof and floor rock mass, avoid the damage caused by the excessive pressure of the observed water source to the drilling fissures, and improve the stability and accuracy of the measurement process of the mine roof and floor rock mass damage range foundation of sex.

Description of drawings

The present invention is described in detail below in conjunction with accompanying drawing:

Fig. 1 is the structural representation of observation system of the present invention;

Fig. 2 is the overall schematic diagram of the test probe in the observation system of the present invention;

Fig. 3 is the structural representation of the first plugging unit in the observation system of the present invention;

Fig. 4 is the structural representation of the second plugging unit in the observation system of the present invention;

Figure 5 and Figure 6 are structural schematic diagrams of the pressure conversion system;

Figures 7 and 8 are structural schematic diagrams of the water pressure converter;

Figures 9 and 10 are structural schematic diagrams of the slotted pipe joint of the present invention;

Fig. 11 is a schematic diagram of the state of the water pressure converter in the pressure conversion system of the present invention;

Fig. 12 is a schematic view of the guide cone structure in the observation system of the present invention;

In the figure, 1. rock mass, 2. drilling, 3. plugging capsule, 4. connecting pipe, 5. water pressure converter, 6. tubular joint 1, 7. leaking pipe, 8. slotted pipe joint, 9 1. Tubular joint 3, 10. High-pressure hose, 11. Drill pipe, 12. Drilling machine, 13. Water injection console, 14. Guide cone, 15. Tubular joint 2, 16. Piston, 17. Water guide hole, 18. Spring , 19, boss, 20, substrate, 21, small hole.

detailed description

The present invention proposes an integrated observation system for double-end plugging and leak detection. In order to make the advantages and technical solutions of the present invention clearer and clearer, the present invention will be further clearly and completely described below in conjunction with specific embodiments.

In the present invention, the integrated observation system for double-end plugging and leak detection, as shown in Fig. 1 to Fig. 8, includes a plugging system, a pressure conversion system, a guiding system and a supply propulsion system, wherein the supply propulsion system is shown in Fig. 1 in detail As shown, it includes a water injection console 13, a drill pipe 11, and a drilling rig 12. The water injection console 13 is responsible for providing a fixed pressure water source, and is connected to the integrated observation system through a high-pressure hose 10 and the drill pipe 11. The drilling rig 12 is responsible for promoting the integrated observation system. system to the corresponding observation area, the water injection console 13 includes a flow meter and a pressure gauge, which are used to observe the water injection flow and water injection pressure respectively, and the drilling rig 12 is responsible for advancing the integrated observation system to the corresponding observation area. The working operation method can be realized by referring to the prior art.

The plugging system is shown in Figures 1 to 4 for details, including a connecting pipe 4 and a first and second blocking unit located at both ends of the connecting pipe 4, and the first blocking unit is on the innermost side near the rock mass borehole. , the second plugging unit is located away from the rock mass drilling side, wherein the second plugging unit includes two tubular joints one 6, leaking pipe 7 and plugging capsule 3, and the first plugging unit includes tubular joint two 15, Leakage pipe 7, tubular joint 3 9 and plugging capsule 3; connecting pipe 4 is a sealed pipeline, its left end is threadedly connected with the second plugging unit through tubular joint 1 6, and its right end is connected with the first plugging unit through the pressure conversion system Units are threaded.

The two ends of the leaking pipe 7 in the second plugging unit are threadedly connected with two tubular joints-6 respectively, and there are two leaking holes on the leaking pipe 7, and a convex structure and a groove are arranged on the outside of the tubular joint-6, wherein the convex The shape structure can be a raised portion vertically upward and downward, or other protrusions similar to this structure, the function of the raised portion is to block the sealing capsule 3 to prevent it from slipping, and the function of the groove is to pass through the fixed The component fixes the blocking capsule 3 thereon. Wherein, the convex structure is used to block the plugging capsule 3 to prevent slipping, and the groove can fix the plugging capsule 3 on it through the fixing member, and the plugging capsule 3 is wrapped around the groove-shaped structure of the two tubular joints-6 On, by cooperating with leakage pipe 7, form the space of swelling and blocking capsule 3.

In the first plugging unit, the left and right ends of the leaking pipe 7 are threadedly connected to the tubular joint 2 15 and the tubular joint 3 9 respectively, and the tubular joint 2 5 and the tubular joint 3 9 are provided with a groove-shaped structure outside, which can be fixed and blocked by a fixing member Capsule 3, the plugging capsule 3 is wrapped around the groove-shaped structure outside the tubular joint 2 15 and the tubular joint 3 9, and cooperates with the leaking pipe 7 to form a space for swelling and blocking the capsule 3.

There is only one connecting pipe 4, which is threadedly connected with the first blocking unit and the second blocking unit through the tubular joint one 6 and the grooved pipe joint 8 respectively.

The pressure conversion system is shown in Figure 5 to Figure 11 for details, including a water pressure converter 5 and a slotted pipe joint 8; the left end of the slotted pipe joint 8 is threaded with the connecting pipe 4, and the right end is threaded with the tubular joint 2 15, and the slot The outer area of the left end surface of the pipe joint 8 is threadedly connected with the four water pressure converters 5 .

The water pressure converter 5 includes two parts, a piston 16 and a base body 20. The piston 16 is a cylinder with different sizes at the left _and right ends _. The surface area of the small cylindrical piston 16 is S _, and the contact water pressure _is P. There is a boss 19 near the right end of the piston 16. The spring 18 cooperates with the corresponding part inside the base body 20 to ensure that the piston 16 does not break away from the base body 20 while moving in the base body 20. The piston 16 is provided with interconnected water guide holes 17. The water guide hole 17 at the right end communicates with the card groove pipe joint 8 through the small hole 21, and the water guide hole 17 at the left end is initially sealed by the inner wall of the base body 20. It communicates with borehole 2.

The working principle of the above-mentioned hydraulic pressure converter 5 is as follows:

The surface area of the larger cylinder piston 16 at the left end is _outside S, and the contact water pressure is _outside the borehole 2 observation water pressure P; the surface area of the smaller cylinder piston 16 at the right end is _inside S, and the contact water pressure is Type II plugging end In the blockage water pressure P, the elastic coefficient k and the compression amount x _in the spring 18 can be known by the principle of two-force balance:

When F _outside + F _bomb ≥ F _inside , that is, P _outside S _outside + kx ≥ P _inside S _inside , then the water pressure converter 5 is in the closed state, the piston 16 does not move outward, and the water guide hole 17 is blocked by the inner wall of the base body 20 and cannot It communicates with borehole 2.

When F _outside + F _bomb F ≤ F _inside , that is, P _outside S _outside + kx ≤ P _inside S _inside , then the water pressure converter 5 is in the open state, the piston 16 moves outward, and the water guide hole 17 exposes the inner wall of the substrate 20, and The borehole 2 is connected, and the borehole 2 is replenished with water.

The above process can not only realize the conversion from the internal measurement (referring to the plugging capsule 3) to block the high-pressure water (generally 2.5MPa) to the outside (referring to the inside of the borehole 2) to observe the low-pressure water (0.1MPa), but also realize the drilling as required 2 Real-time water replenishment process.

Among them, _{the outside} of P is the observed water pressure, which is usually taken as 0.1MPa in engineering, and _{the inside} of P is the water pressure of swelling and sealing capsule 3 in the sealing system, which is usually taken as 2.5MPa in engineering. It can be seen that the ratio of _outside S _{to inside} S is about It is 25:1. Considering that the area difference is too large, a spring 18 is added for adjustment. First, the ratio of the inner and outer areas can be reduced, which is convenient for actual manufacturing needs. Second, the piston 16 can be automatically returned.

The guide system is shown in Figure 1 and Figure 12 in detail, including a guide cone 14, which is threadedly connected with the tubular joint 3 9, and the guide cone 14 is a conical structure, which is convenient for drilling when there are uneven steps in the drill hole 2. effect.

The following is a detailed description of the observation method of the double-end plugging leak detection integrated observation system of the present invention. The main steps include:

(1) Drilling 2: use a conventional coal mine drilling rig 12 to drill 2 holes at specified angles successively in the roof or floor rock mass 1 in the coal and rock roadway, and the hole depth reaches 30-70m;

(2) Install the observation system: clean up the debris in the borehole 2, install the observation system in the borehole 2, connect the drilling rig 12, the water injection console 13, etc. through the corresponding pipelines of the high-pressure hose 10, and use the drilling rig 12 and the drill pipe 11 Send it to the drill hole 2 initial position;

(3) Close the borehole 2: after it reaches the initial position, expand the plugging capsule 3 to seal the borehole 2, that is, use the water injection operation table 13 to inject a water source with a fixed pressure into the first indexing unit and the second plugging unit until it reaches the predetermined water pressure;

(4) Measure the flow vector parameters: after the plugging is qualified, measure the flow vector parameters, that is, after the water pressure is stable, wait for 1-2 minutes, read the total flow during this period, record and calculate the flow value per unit time, Withdraw the pressure water source to make the plugging capsule 3 in the depressurized state, then use the drilling rig 12 and the drill pipe 11 to move the observation system to the next observation hole section, repeat steps 3 to 4, and measure the borehole 2 in turn.

The parts not mentioned in the present invention can be realized by adopting or referring to the prior art.

Although terms such as water pressure converters and slotted pipe joints are often used in this article, the possibility of using other terms is not excluded, and those skilled in the art can simply replace these terms under the inspiration of the present invention , should be within the protection scope of the present invention.

Claims (8)

1. a kind of closure for mine roof and floor rock mass leak hunting combined geometry it is characterised in that：It includes closure system System, guidance system, supply propulsion system and pressure conversion system；

Described plugging system includes communicating pipe, the first closure unit being located at communicating pipe two ends and the second closure unit, and described the One closure unit all includes leak pipe, is connected near the inner side of rock body drilled, described first closure unit, the second closure unit The tubular configured joint at leak pipe two ends and closure capsule, described first closure unit and communicating pipe, the second closure unit and communicating pipe Between connected by described tubular configured joint, described closure capsule be arranged on two tubular configured joints leak pipe periphery, described closure Form certain closure space between capsule and leak pipe；

Described pressure conversion system includes hydraulic pressure transducer and draw-in groove pipe joint, and described hydraulic pressure transducer passes through draw-in groove pipe joint even It is connected on the tubular configured joint of described first closure unit tail, described hydraulic pressure transducer includes piston and matrix two parts, described The area of piston left side is more than the area of right side, is provided with, in described piston, the water-guiding hole being interconnected, positioned at right-hand member Water-guiding hole is connected with described draw-in groove pipe joint by aperture, positioned at the water-guiding hole of left end start when by matrix inner wall sealing, The right-hand member of piston is provided with boss, and described boss is spacing for carrying out to the spring in piston, and described piston is in order to control left end Water-guiding hole keeps connecting or closing with the boring in country rock；

Described guidance system includes guide cone, and described guide cone is connected with the tubular configured joint of the described first closure unit header；

Described supply propulsion system was connected with described communicating pipe, for water filling in described communicating pipe, showing and recording each ginseng Number；

Two leaking holes are laid with every section of leak pipe.

2. the closure for mine roof and floor rock mass according to claim 1 is leaked hunting combined geometry, and its feature exists In：Lobe vertically upward and vertically downward is provided with described tubular configured joint, described closure capsule is wrapped in two projections The leak pipe periphery in portion.

3. the closure for mine roof and floor rock mass according to claim 2 is leaked hunting combined geometry, and its feature exists In：Arrange fluted on the tubular configured joint of leak pipe side away from lobe certain distance, described groove by with fixation Described closure capsule is fixed by part cooperation.

4. the closure for mine roof and floor rock mass according to claim 1 is leaked hunting combined geometry, and its feature exists In：Described communicating pipe is to threaded with tubular configured joint.

5. the closure for mine roof and floor rock mass according to claim 1 is leaked hunting combined geometry, and its feature exists In：When piston meets P_OutwardS_Outward+kx≤P_InteriorS_InteriorWhen, left end water-guiding hole is connected with the boring in country rock, wherein, P_OutwardFor observing hydraulic pressure, P_InteriorFor playing swollen closure capsule hydraulic pressure, S in plugging system_OutwardFor left end piston area area, S_InteriorFor right-hand member piston area area, k is bullet Coefficient of elasticity in spring, x is decrement.

6. the closure for mine roof and floor rock mass according to claim 5 is leaked hunting combined geometry, and its feature exists In：Described P_InteriorFor 2.5MPa.

7. the closure for mine roof and floor rock mass according to claim 1 is leaked hunting combined geometry, and its feature exists In：Described supply propulsion system includes water flood operations platform, pressure of return water table, electronic logger, rig and drilling rod, described water filling behaviour Station provides high-pressure water into described communicating pipe, and described electronic logger is installed on water flood operations platform, described pressure of return water table For being corrected to the pressure of return water in return pipe detecting.

8. the closure for mine roof and floor rock mass according to claim 1 is leaked hunting combined geometry, and its feature exists In：The area of described piston left side and the area ratio of right side are 10～25:1.