CN106837240A - Segmentation capsule-type injection hole sealing device and its method for sealing based on fluid - Google Patents

Abstract

The invention discloses a fluid-based segmented capsule grouting sealing device and a hole sealing method thereof. The fluid-based segmented capsule grouting sealing device includes a first core pipe and a second core pipe sleeved on the outer periphery of a gas drainage pipe. Two core tubes, the outer periphery of the first core tube is socketed with capsule A, the outer periphery of the second core tube is socketed with capsule B, a grouting space is reserved between the first core tube and the second core tube, and the first grouting channel is directed towards capsule A respectively. The non-Newtonian fluid is injected into the capsule B, the non-Newtonian fluid is injected into the grouting space by the second grouting channel, and a one-way check valve is provided on the first grouting channel and the second grouting channel. Compared with the prior art, the present invention has the beneficial effect of: grouting the two sections of capsules during work, sealing the grouting space after the capsule expands, and then grouting and sealing the grouting space, when the capsule or the grouting space is sealed When the effect declines, the slurry can be replenished for the second time. It has the characteristics of simple operation, good sealing effect, safety and reliability, strong applicability and high efficiency.

Description

Fluid-based segmented capsule grouting sealing device and its sealing method

technical field

The invention relates to a hole sealing device, in particular to a fluid-based segmented capsule grouting hole sealing device and a hole sealing method.

Background technique

Gas is a common associated gas in the coal mining process. On the one hand, if it is not properly prevented, the gas gushing out during the coal mining process will become a natural disaster that threatens the safety of coal mine production; , it becomes an important energy source. With the increasing depth and intensity of our coal mining, there are more and more high-gas mines. Regardless of disaster prevention or exploitation of this energy, gas drainage is the most commonly used technical approach, and drilling sealing is the key to gas drainage One of the technologies, because the negative pressure of hole bottom drainage has the effect of draining gas and forcing gas analysis. The effect of borehole sealing directly affects the concentration and efficiency of gas drainage.

At present, about 65% of the coal mining faces in my country have a low concentration of pre-extraction gas, and the main problem is that the sealing quality of the borehole is too poor. At present, the most commonly used method for sealing holes in gas drainage is to fill the gap between the drainage pipe and the borehole wall with expansive materials such as polyurethane and expansive cement, and rely on the expansion and solidification of these materials to achieve the purpose of sealing the borehole. , and then conduct gas extraction. After a certain period of gas extraction, the coal seam will be affected by deformation, displacement or mining, causing the pores (cracks) in the coal seam around the drill hole to expand and develop. At this time, the outside air will enter the air extraction drill from the crack channel. In the borehole, the concentration of gas drainage is significantly reduced, which shortens the effective drainage period of the drainage borehole and reduces the utilization rate of the borehole.

In order to solve this problem, technicians invented the capsule type hole sealer, but there is a common shortcoming in this type of hole sealer, that is, although the hole sealer expands, it can be tightly combined with the borehole wall to connect the extraction pipe and the borehole. The gap between the walls is sealed, but the cracks in the coal body around the borehole cannot be effectively sealed, resulting in gas leakage during gas pumping and affecting the extraction concentration.

Contents of the invention

The purpose of the present invention is to solve the deficiencies of the above-mentioned technical problems, and provide a fluid-based segmented capsule grouting and sealing device that is simple in operation, good in sealing effect, safe and reliable, strong in applicability, and high in efficiency. The invention discloses a capsule type grouting sealing device and a hole sealing method thereof.

The present invention is for solving the deficiencies of the above-mentioned technical problems, and the technical scheme adopted is:

A fluid-based segmented capsule grouting and sealing device, including a first core tube and a second core tube sleeved on the outer periphery of the gas drainage pipe. One end of the gas drainage pipe is provided with a gas collection port, and the gas is sucked along the gas collection port. The direction of air, the first core tube is downstream of the second core tube, the outer periphery of the first core tube is sleeved with capsule A, the outer circumference of the second core tube is sleeved with capsule B, and the first core tube and the second core tube are reserved for injection. In the grouting space, the first grouting channel leads to capsule A and capsule B in turn, and injects non-Newtonian fluid into capsule A and capsule B respectively, and the second grouting channel passes through capsule A to inject fluid into the grouting space, the first Both the grouting channel and the second grouting channel are provided with one-way check valves.

The inner wall of the first core tube is integrally provided with a No. 1 tube and a No. 2 tube along its longitudinal direction, and the inner wall of the second core tube is integrally provided with a No. 1 tube along its longitudinal direction. The No. 1 tube and the No. 2 tube are prefabricated Both ends are in a closed state, and connecting holes are respectively provided on the tube walls of the four proximal parts of the first core tube corresponding to the No. 1 tube and No. 2 tube in the first core tube. The lumen of the lumen and the No. 2 tube is connected with the outside world, and a connection hole is also provided on the tube wall corresponding to the proximal end of the No. 1 tube in the second core tube towards the grouting space. The lumen of the No. 1 tube communicates with the outside world. An opening is set in the middle of the No. 1 tube. The opening runs through the tube wall of the first core tube or the second core tube. The one-way check valve is sealed at the opening. The first grouting channel It includes the first grouting pipe connected in series, the No. 1 pipe on the first core pipe, the transition connecting pipe and the No. 1 pipe on the second core pipe, and the second grouting channel includes the second grouting pipe connected in series. No. 2 tube on slurry tube and first core tube.

The first grouting pipe, the No. 1 pipe on the first core pipe, the transition connecting pipe and the No. 1 pipe on the second core pipe are respectively connected by right-angle elbows, and the second grouting pipe and the No. 1 pipe on the first core pipe The No. 2 pipes are also connected by a right-angle elbow, and the No. 2 pipe on the first core pipe is connected to the connecting hole facing the grouting space with the right-angle elbow, and the right-angle elbow extends into the grouting space.

The one-way check valve includes an annular groove and an elastic sealing ring, the elastic sealing ring is set in the annular groove, and the grooves are respectively arranged at openings corresponding to the middle of the No. 1 tube on the first core tube and the second core tube.

The fluid is a non-Newtonian fluid, and the non-Newtonian fluid is a mixture of polyacrylamide and a bonding agent.

A method for sealing holes based on a fluid segmented capsule grouting sealing device, comprising the following steps:

Step 1. Assemble the fluid-based segmented capsule grouting and sealing device, and install the fluid-based segmented capsule grouting and sealing device into the borehole to be sealed;

Step 2. Use the first grouting channel to inject fluid into capsule A and capsule B respectively to expand capsule A and capsule B. When the pressure reaches 1.0-1.5MPa, stop grouting. Capsule A and capsule B will drill the two ends of the hole Blocking, forming a closed space between the two;

Step 3, using the second grouting channel to inject fluid into the grouting space to fill the grouting space, and under the action of the grouting pressure, the fluid continuously penetrates into the coal wall fissures to seal the borehole;

Step 4. When the sealing effect of capsule A and capsule B decreases, perform secondary grout replenishment through the first grouting channel;

Step 5: When the sealing effect of the grouting space decreases, the second grouting channel performs secondary grouting.

The fluid is a fluid gel mixed with polyacrylamide and a cross-linking agent. As the reaction time increases, the viscosity of the fluid increases with time, and becomes a less fluid paste after 2 hours. After one week, the viscosity reaches the maximum and maintains, and finally exists in the cracks of the coal seam as a high-viscosity flowable colloid.

Compared with prior art, the beneficial effect of the present invention is:

(1) The present invention is composed of two sections of capsules. During work, the two sections of capsules are grouted earlier to seal the grouting space after the capsule expands, and then the grouting space is sealed by grouting. When the sealing effect of the capsule or the grouting space decreases , can be used for secondary slurry replenishment, and has the characteristics of simple operation, good sealing effect, safety and reliability, strong applicability and high efficiency.

(2) The two ends of the borehole adopt the method of capsule expansion to seal the gap between the gas drainage pipe and the borehole wall, inject non-Newtonian fluid sealing material into the grouting space, and under the action of pressure, the non-Newtonian fluid penetrates into the coal body, thereby Seal the cracks around the borehole to effectively prevent gas leakage during gas drainage and ensure the concentration of gas extraction.

(3) Both the first grouting channel and the second grouting channel are provided with one-way check valves, which can effectively prevent the non-Newtonian fluid from flowing backward and ensure the sealing effect.

(4) The grouting medium adopts non-Newtonian fluid. Compared with the medium used in the prior art, the non-Newtonian fluid has fluidity and viscosity, and as the reaction time increases, the viscosity continues to increase, and becomes flow after 2 hours For the paste with poor properties, the viscosity reaches the maximum after one week, and then the viscosity does not change any more, and finally exists as a high-viscosity flowable colloid in the cracks of the coal seam.

Description of drawings

Fig. 1 is a schematic diagram of the installation structure of the fluid-based segmented capsule grouting and sealing device of the present invention;

Fig. 2 is the structural representation of the first core tube;

Figure 3 is a cross-sectional view of the one-way check valve.

Among them: 1. Gas drainage pipe; 2. First grouting pipe; 3. Second grouting pipe; 4. Capsule A; 5. Capsule B; 6. One-way check valve; 7. Coal body; 8. Drilling hole; 9. Gas collecting port; 10. First core pipe; 11. Second core pipe; 12. Grouting space; 13. No. 1 pipe; 14. No. 2 pipe; 15. Transition connection pipe; 16-ring Groove; 17-connecting hole; 18-opening hole; 19-core tube outer wall; 20-core tube inner wall.

detailed description

The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

The figure includes the following structures: gas drainage pipe 1, first grouting pipe 2, second grouting pipe 3, capsule A4, capsule B5, one-way check valve 6, coal body 7, drill hole 8, gas collection port 9. The first core tube 10, the second core tube 11, the grouting space 12, the first tube 13, the second tube 14, the transition connecting tube 15, the annular groove 16, the connection hole 17, the opening 18, the outer wall of the core tube 19 and core tube inner wall 20.

As shown in Figure 1-3, the fluid-based segmented capsule grouting and sealing device includes a first core tube and a second core tube sleeved on the outer periphery of the gas drainage pipe, and one end of the gas drainage pipe is provided with a gas The gas collection port is along the gas-inhalation direction of the gas collection port. The first core tube is downstream of the second core tube. A grouting space is reserved between the two core tubes, the first grouting channel leads to capsule A and capsule B in turn, and injects non-Newtonian fluid into capsule A and capsule B respectively, and the second grouting channel passes through capsule A to inject Fluid is injected into the grouting space, and one-way check valves are provided on the first grouting channel and the second grouting channel.

The inner wall of the first core tube is integrally provided with a No. 1 tube and a No. 2 tube along its longitudinal direction, and the inner wall of the second core tube is integrally provided with a No. 1 tube along its longitudinal direction. The No. 1 tube and the No. 2 tube are prefabricated Both ends are in a closed state, and connecting holes are respectively provided on the tube walls of the four proximal parts of the first core tube corresponding to the No. 1 tube and No. 2 tube in the first core tube. The lumen of the lumen and the No. 2 tube is connected with the outside world, and a connection hole is also provided on the tube wall corresponding to the proximal end of the No. 1 tube in the second core tube towards the grouting space. The lumen of the No. 1 tube communicates with the outside world. An opening is set in the middle of the No. 1 tube. The opening runs through the tube wall of the first core tube or the second core tube. The one-way check valve is sealed at the opening. The first grouting channel It includes the first grouting pipe connected in series, the No. 1 pipe on the first core pipe, the transition connecting pipe and the No. 1 pipe on the second core pipe, and the second grouting channel includes the second grouting pipe connected in series. No. 2 tube on slurry tube and first core tube.

The first grouting pipe, the No. 1 pipe on the first core pipe, the transition connecting pipe and the No. 1 pipe on the second core pipe are respectively connected by right-angle elbows, and the second grouting pipe and the No. 1 pipe on the first core pipe The No. 2 pipes are also connected by a right-angle elbow. The No. 2 pipe on the first core pipe faces the connection hole of the grouting space and is connected with the right-angle elbow. The right-angle elbow extends into the grouting space, and the right-angle elbow is matched by a thread It is connected on the connecting hole, and a rubber washer is arranged between the right-angle elbow and the connecting hole.

The one-way check valve includes an annular groove and an elastic sealing ring, the elastic sealing ring is set in the annular groove, and the grooves are respectively arranged at openings corresponding to the middle of the No. 1 tube on the first core tube and the second core tube. The elastic sealing ring is just placed in the annular groove when there is no external force. When grouting, the sealing ring expands due to the pressure, so that the fluid enters the capsule through the opening in the annular groove, and stops when the pressure in the capsule reaches the requirement. When grouting, the sealing ring is no longer contracted by the extrusion force of the fluid, and the opening in the annular groove is re-closed.

The fluid is a non-Newtonian fluid, and the non-Newtonian fluid is a mixture of polyacrylamide and a bonding agent.

A method for sealing holes based on a fluid segmented capsule grouting sealing device, comprising the following steps:

Step 1. Assemble the fluid-based segmented capsule grouting and sealing device, and install the fluid-based segmented capsule grouting and sealing device into the borehole to be sealed;

Step 2. Use the first grouting channel to inject fluid into capsule A and capsule B respectively to expand capsule A and capsule B. When the pressure reaches 1.0-1.5MPa, stop grouting. Capsule A and capsule B will drill the two ends of the hole Blocking, forming a closed space between the two;

Step 3, using the second grouting channel to inject fluid into the grouting space to fill the grouting space, and under the action of the grouting pressure, the fluid continuously penetrates into the coal wall fissures to seal the borehole;

Step 4. When the sealing effect of capsule A and capsule B decreases, perform secondary grout replenishment through the first grouting channel;

Step 5: When the sealing effect of the grouting space decreases, the second grouting channel performs secondary grouting.

The fluid is a fluid gel mixed with polyacrylamide and a cross-linking agent. As the reaction time increases, the viscosity of the fluid increases with time, and becomes a less fluid paste after 2 hours. After one week, the viscosity reaches the maximum and maintains, and finally exists in the cracks of the coal seam as a high-viscosity flowable colloid.

Claims (7)

1. A segmented capsule grouting and sealing device based on fluid, including a first core tube and a second core tube sleeved on the outer periphery of the gas drainage pipe. One end of the gas drainage pipe is provided with a gas collection port. The direction of inhalation at the air port, the first core tube is downstream of the second core tube, the outer periphery of the first core tube is sleeved with capsule A, and the outer circumference of the second core tube is sleeved with capsule B, characterized in that: the first core tube and the second core tube A grouting space is reserved between the tubes. The first grouting channel leads to capsule A and capsule B in turn, and injects non-Newtonian fluid into capsule A and capsule B respectively. The second grouting channel passes through capsule A to the grouting space. The fluid is injected inside, and one-way check valves are provided on the first grouting channel and the second grouting channel. 2. The fluid-based segmented capsule grouting and sealing device according to claim 1, characterized in that: the inner wall of the first core tube is integrally provided with a No. 1 tube and a No. 2 tube along its longitudinal direction, and the No. 1 tube The inner wall of the two-core tube is integrally provided with a No. 1 tube along its longitudinal direction. The two ends of the No. 1 tube and the No. 2 tube are closed during prefabrication. Connecting holes are respectively provided on the tube walls of the two proximal parts, and the connecting holes respectively communicate the lumen of the No. 1 tube and the No. 2 tube in the first core tube with the outside world, and the second core tube corresponds to the No. A connecting hole is also provided on the tube wall facing the proximal part of the grouting space, and the connecting hole connects the lumen of the No. 1 tube on the second core tube with the outside world. An opening is set in the middle of the No. 1 tube, and the opening runs through the first core. tube or the tube wall of the second core tube, the one-way check valve is sealed at the opening, and the first grouting channel includes the first grouting tube connected in series, the No. 1 tube on the first core tube, and the transition connection The No. 1 pipe on the second core pipe, and the second grouting channel includes the second grouting pipe and the No. 2 pipe on the first core pipe connected in series. 3. The fluid-based segmented capsule grouting and sealing device according to claim 2, characterized in that: the first grouting pipe, the No. 1 pipe on the first core pipe, the transition connecting pipe and the second core pipe The No. 1 pipes on the top are respectively connected by right-angle elbows, the second grouting pipe and the No. 2 pipe on the first core pipe are also connected by right-angle elbows, and the No. The connecting hole in the space is connected with the right-angle elbow, and the right-angle elbow extends into the grouting space. 4. The fluid-based segmented capsule grouting and sealing device according to claim 2, characterized in that: the one-way check valve comprises an annular groove and an elastic sealing ring, and the elastic sealing ring is set in the annular groove, The grooves are respectively arranged on the first core tube and the second core tube at openings corresponding to the middle part of the No. 1 tube. 5 . The fluid-based segmented capsule grouting and sealing device according to claim 1 , wherein the fluid is a non-Newtonian fluid, and the non-Newtonian fluid is a mixture of polyacrylamide and a bonding agent. 6. The sealing method of fluid-based segmented capsule grouting sealing device according to claim 1, characterized in that: comprising the following steps: Step 1. Assemble the fluid-based segmented capsule grouting and sealing device, and install the fluid-based segmented capsule grouting and sealing device into the borehole to be sealed; Step 2. Use the first grouting channel to inject fluid into capsule A and capsule B respectively to expand capsule A and capsule B. When the pressure reaches 1.0-1.5MPa, stop grouting. Capsule A and capsule B will drill the two ends of the hole Blocking, forming a closed space between the two; Step 3, using the second grouting channel to inject fluid into the grouting space to fill the grouting space, and under the action of the grouting pressure, the fluid continuously penetrates into the coal wall fissures to seal the borehole; Step 4. When the sealing effect of capsule A and capsule B decreases, perform secondary grout replenishment through the first grouting channel; Step 5: When the sealing effect of the grouting space decreases, the second grouting channel performs secondary grouting. 7. The sealing method of fluid-based segmental capsule grouting and sealing device according to claim 6, characterized in that: the fluid is a fluid gel mixed with polyacrylamide and crosslinking agent, As the reaction time increases, the viscosity of the fluid increases continuously with the increase of time. After 2 hours, it becomes a paste with little fluidity. After one week, the viscosity reaches the maximum and remains, and finally exists in the coal seam as a high-viscosity flowable colloid. Between the cracks.