CN111271023B - Push type hole internal integrated rapid hole sealing device and method - Google Patents
Push type hole internal integrated rapid hole sealing device and method Download PDFInfo
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- 238000007789 sealing Methods 0.000 title claims abstract description 293
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 239000003566 sealing material Substances 0.000 claims abstract description 27
- 239000011148 porous material Substances 0.000 claims abstract description 12
- 238000003860 storage Methods 0.000 claims description 31
- 230000000149 penetrating effect Effects 0.000 claims description 15
- 229920000742 Cotton Polymers 0.000 claims description 13
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- 238000005553 drilling Methods 0.000 claims description 11
- 239000003245 coal Substances 0.000 claims description 10
- 238000007596 consolidation process Methods 0.000 claims description 3
- 239000004047 hole gas Substances 0.000 claims 1
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- 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
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Abstract
The invention discloses a push-type hole internal integrated rapid hole sealing device and a method, wherein the device comprises a front viscous flow strong plugging device, an integrated mixed plugging device and a rear viscous flow strong plugging device which are coaxially connected in sequence through a limiting steel wire rope; the integrated mixed sealer comprises an inner layer pipe, a middle layer pipe, an outer layer pipe, a front sealing end cover and a rear sealing end cover which are coaxially sleeved from inside to outside; the middle-layer pipe and the outer-layer pipe are both provided with sealing sieve pores, and the inner-layer pipe is sleeved with a hole breaking device and a liquid pushing piston; when the inner pipe is pushed axially, the middle pipe, the outer pipe, the front and rear viscous flow strong blocking devices and the orifice baffle are fixed, and the hole breaking device can puncture the sealing sieve holes of the middle pipe and realize A, B sealing liquid flowing mixing and reaction expansion by combining with the liquid pushing piston. The push-type hole-in-hole integrated rapid hole sealing device provided by the invention realizes the simple action of pushing the reinforced extraction pipe, promotes the uniform mixing and reaction expansion of hole sealing materials in the device, automatically completes hole sealing, and simplifies the hole sealing operation process.
Description
Technical Field
The invention relates to the technical field of drilling and sealing of gas extraction holes in coal seams in coal mines, in particular to a push type hole internal integrated rapid sealing device and method.
Background
Coal seam gas resources in China are rich, meanwhile, gas is also a main disaster causing factor of coal mine production in China, coal seam gas extraction is a fundamental measure for preventing and treating gas accidents and is also a foundation for coal seam gas utilization, and the hole sealing quality and the construction efficiency of a gas extraction drill hole directly influence the extraction efficiency of coal seam gas. The hole sealing technology adopted at home and abroad at present mainly comprises material type hole sealing of polyurethane and the like, hole sealing of a hole sealing device, hole sealing of 'two-plugging one-injection' hole sealing, secondary hole sealing and the like, and the prior art can meet the gas extraction requirement of a drill hole by theoretical analysis, but according to statistics, about 65% of pre-extraction gas concentration of a gas extraction drill hole of a stope face in China is lower than 30%, which reflects that the sealing quality of the existing extraction drill hole is not high and the hole sealing effect is not ideal. The existing hole sealing technology has the problems of complex operation process, high labor intensity, insufficient hole sealing and the like in the whole tracking analysis, can not meet the theoretical hole sealing process requirement in the construction process, and particularly needs external power equipment when hole sealing liquid is injected, so that the cost, the labor amount and the operation difficulty are further increased. In addition, the existing hole sealing device mainly adopts a hole sealing process of two-plugging and one-injecting, the whole hole sealing liquid and the hole sealing device are still in a separated state, the operation requirement is high, the injection pressure provided by external force equipment increases the construction complexity, and the theoretical hole sealing requirement is difficult to achieve on site. Therefore, a need exists for a hole sealing device which can complete gas extraction drilling in the underground well simply, quickly, stably and with low labor capacity on the premise of ensuring the hole sealing effect.
Disclosure of Invention
The invention aims to provide a push type hole internal integrated rapid hole sealing device and a method, the device is simple in structure and convenient to operate, hole sealing liquid, a strong plugging device and a reinforced extraction pipe are integrated, the effect is better, and the application is wider.
In order to achieve the purpose, the invention adopts the following technical scheme:
a push type in-hole integrated rapid hole sealing device comprises an integrated mixing sealer, wherein two viscous flow strong plugging devices are arranged on two sides of the integrated mixing sealer, and the integrated mixing sealer and the two viscous flow strong plugging devices are coaxial and can be connected with each other through a limiting steel wire pull rope;
the integrated mixed sealer comprises an inner layer pipe, a middle layer pipe and an outer layer pipe which are coaxially sleeved from inside to outside and are mutually independent and sealed, and a front sealing end cover and a rear sealing end cover which are arranged at two ends of the three layers of pipes; sealing sieve pores are arranged on the middle-layer pipe and the outer-layer pipe, a hole breaker and a liquid pushing piston are sequentially sleeved on the inner-layer pipe, and the hole breaker and the liquid pushing piston are positioned between the front sealing end cover and the rear sealing end cover; the inner-layer pipe can penetrate through the front sealing end cover and the rear sealing end cover in a sealing manner, and the inner-layer pipe is in dynamic sealing with the front sealing end cover and the rear sealing end cover;
the two stagnant flow strong blocking devices are respectively sleeved on the inner layer pipe penetrating through the front sealing end cover and the rear sealing end cover; the stagnation strong plugging device comprises a layer of netted stagnation cotton yarn sleeved on the inner layer pipe, a reverse plugging rubber mat sleeved outside the layer of netted stagnation cotton yarn, and two sealing end covers arranged at two ends of the layer of netted stagnation cotton yarn and the reverse plugging rubber mat; an inner layer pipe penetrating out of the stagnation strong plugging device is connected with a screen pipe in an extraction pipe hole; the inner pipe penetrating out of the other stagnant flow strong plugging device is connected with an outer gas extraction pipe with a hole, and the stagnant flow strong plugging device can be connected with an orifice baffle arranged at a drilling orifice through a limiting steel wire pull rope.
The invention also comprises the following technical characteristics:
specifically, the stagnant flow strong blocking device comprises a front stagnant flow strong blocking device and a rear stagnant flow strong blocking device, wherein the front stagnant flow strong blocking device is sleeved on an inner pipe penetrating through a front sealing end cover, and the rear stagnant flow strong blocking device is sleeved on an inner pipe penetrating through a rear sealing end cover; the inner layer pipe can move axially relative to the front viscous flow strong blocking device and the rear viscous flow strong blocking device;
in the two sealing end covers of the front viscous flow strong plugging device, the first sealing end cover is close to the screen pipe in the extraction pipe hole, the second sealing end cover is close to the integrated mixed plugging device, and an end cover pull ring is arranged on the second sealing end cover to be connected with a limiting steel wire pull rope; sealing end cover fasteners are arranged at the joints of the first sealing end cover and the inner layer pipe and the joints of the second sealing end cover and the inner layer pipe;
among the two sealing end covers of the rear stagnation strong plugging device, the sealing end cover close to the integrated mixed plugging device is a third sealing end cover, the sealing end cover close to the gas extraction pipe outside the hole is a fourth sealing end cover, and end cover pull rings are arranged on the third sealing end cover and the fourth sealing end cover respectively and used for connecting limiting steel wire pull ropes; and sealing end cover fasteners are arranged at the joints of the third sealing end cover and the inner-layer pipe and the joints of the fourth sealing end cover and the inner-layer pipe.
Specifically, the reverse plugging rubber pad of the viscous flow strong plugging device can be tightly attached to the inner wall of the drill hole, so that the layer of reticular viscous flow cotton yarn and the reverse plugging rubber pad can prevent the hole sealing liquid from flowing towards the inner direction and the outer direction of the drill hole, and the hole sealing liquid can fully reflect expansion and be quickly solidified.
Specifically, the hole breaker comprises an annular main body and a plurality of elastic tip portions distributed along the circumferential direction of the annular main body, and the elastic tip portions can stretch out and draw back in the radial direction; the elastic tip part is compressed by the inner wall of the middle layer pipe, and when the hole breaking device moves axially along with the inner layer pipe to reach the position of the sealing sieve hole of the middle layer pipe, the elastic tip part extends out radially and can pierce the sealing film on the sealing sieve hole.
Specifically, the liquid pushing piston is sleeved on the inner layer pipe and tightly attached to the inner wall of the middle layer pipe, and two piston baffles tightly attached to the liquid pushing piston are arranged on two sides of the liquid pushing piston; the piston baffle is fixedly sleeved on the inner-layer pipe.
Specifically, the front sealing end cover and the rear sealing end cover are both provided with end cover pull rings for connecting limiting steel wire pull ropes; and sealing end cover fasteners are arranged at the joints of the front sealing end cover and the inner layer pipe and the joints of the rear sealing end cover and the inner layer pipe.
Specifically, the front sealing end cover is fixedly connected with the end parts of the outer layer pipe and the middle layer pipe, the rear sealing end cover is fixedly connected with the other end part of the outer layer pipe and the middle layer pipe, a closed annular space between the outer layer pipe and the middle layer pipe is an A hole sealing liquid storage chamber, and a closed annular space between the middle layer pipe and the inner layer pipe is a B hole sealing liquid storage chamber.
Specifically, one or more integrated mixed sealing devices can be connected between the front viscous flow strong blocking device and the rear viscous flow strong blocking device through a limiting steel wire pull rope.
A push type method for integrally and rapidly sealing holes in a hole drives a hole breaker to puncture sealing sieve holes of a middle-layer pipe to conduct a hole sealing liquid storage chamber A and a hole sealing liquid storage chamber B through axial movement of an inner-layer pipe, and a liquid pushing piston enables hole sealing liquid A and hole sealing liquid B to be mixed to generate an expansion reaction; the obtained hole sealing material expansion pressure and the released heat force the outer layer pipe sealing sieve pores to break, the hole sealing material reaches the positions between the drill hole wall and the front viscous flow strong plugging device and the rear viscous flow strong plugging device through the pores, the front and rear expanded hole sealing materials are quickly solidified under the retardation of the front viscous flow strong plugging device and the rear viscous flow strong plugging device, and the middle hole sealing material continues to expand and compact the drill hole wall, so that the expansion hole sealing is completed.
The method comprises the following steps:
the method comprises the following steps: determining the number of the required integrated mixed seal devices and the length of an inner layer pipe according to the hole sealing depth required by drilling in the coal seam, sequentially assembling the integrated mixed seal devices according to the sequence of the front viscous flow strong plug device, the integrated mixed seal device and the rear viscous flow strong plug device, hanging a limiting steel wire pull rope and sending the limiting steel wire pull rope into the drilling hole;
step two: after the device reaches the designated position in the drill hole, the orifice baffle is connected with the limiting steel wire pull rope, and then the orifice baffle is arranged in the orifice and fixed;
step three: pushing the inner pipe, stopping pushing after the pushing limiting distance of the integrated mixed sealer is reached, waiting for the uniform mixing of the sealing liquid in the hole sealing device to react, enabling the sealing sieve pores of the outer pipe to be broken by expansion pressure and released heat, and enabling the sealing material to flow into the front viscous flow strong sealer, the rear viscous flow strong sealer and the hole wall to continue to expand;
step four; and after the hole sealing material is solidified for 10 minutes, connecting the inner-layer pipe with the gas extraction pipe outside the hole, and finishing hole sealing and extraction operation.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the push-type hole-in-hole integrated rapid hole sealing device provided by the invention realizes the simple action of pushing the reinforced extraction pipe, promotes the uniform mixing and reaction expansion of hole sealing materials in the device, automatically completes hole sealing, and simplifies the hole sealing process operation.
2. The push-type hole-sealing integrated rapid hole sealing device is internally provided with A, B hole sealing material storage chambers for storing A, B hole sealing liquid, a liquid pushing piston and a hole breaker are used for opening sealing sieve holes to communicate the two storage chambers, and the A, B hole sealing liquid is rapidly mixed and expanded to react under the pushing and sucking actions of the piston. The hole sealing process does not need to contact hole sealing liquid, does not need mixing outside the hole and grouting outside the hole, and improves the construction environment of grouting and hole sealing.
3. The front and rear viscous flow strong plugging devices provided by the invention have the functions of introducing the inlet holes of the integrated quick hole sealing device and strengthening the inside of the holes, and can also limit the reaction expansion hole sealing liquid of the integrated quick hole sealing device to flow towards the inside and outside of the holes, so that the hole sealing liquid consolidation hole sealing effect is strengthened.
4. A, B hole sealing liquid with different reaction time can be arranged in the integrated mixed sealer, a plurality of integrated mixed sealers can be combined to achieve stepped sectional consolidation, the number of the integrated mixed sealers can be increased and reduced as required, meanwhile, the used first and second hole sealing materials in the whole drilling hole can be modified by setting different reaction time of A, B hole sealing liquid of the integrated mixed sealers, the realization of the plug is ensured, the hole sealing strength is improved, and the expansion reaction time interval of the two hole sealing materials is strictly controlled.
Drawings
FIG. 1 is a schematic view of the connection of the overall structure of the present invention within a borehole;
FIG. 2 is a schematic view of an integrated seal mixer assembly according to the present invention;
FIG. 3 is a longitudinal cross-sectional view of the integrated hybrid sealer of the present invention;
FIG. 4 is a schematic structural diagram of a front stagnation strong blocking device (a) and a rear stagnation strong blocking device (b) of the present invention;
fig. 5 is a schematic diagram of the reaction of the integral sealer to push the sealing material to mix (a. initial push, b. push neutral, c. push complete).
Reference numerals:
1-an integrated mixed packer, 2-a limiting steel wire rope, 3-layers of netted viscous flow cotton yarns, 4-a reverse plugging rubber mat, 5-an internal sieve tube of an extraction tube hole, 6-an external gas extraction tube, 7-an orifice baffle, 8-a front viscous flow strong packer and 9-a rear viscous flow strong packer;
11-inner layer pipe, 12-middle layer pipe, 13-outer layer pipe, 14-front sealing end cover, 15-rear sealing end cover, 16-sealing sieve pore, 17-hole breaker, 18-liquid pushing piston and 19-piston baffle;
81-first end seal cover, 82-second end seal cover, 91-third end seal cover, 92-fourth end seal cover;
A-A hole sealing liquid storage chamber and B-B hole sealing liquid storage chamber.
The invention is described in detail below with reference to the drawings and the detailed description.
Detailed Description
The present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention fall within the protection scope of the present invention. The present invention will be described in further detail with reference to examples.
Example 1:
as shown in fig. 1 to 4, the present embodiment provides a push-type fast hole sealing device for a hole, which includes an integrated mixing and sealing device 1, two stagnation flow strong blocking devices are disposed on two sides of the integrated mixing and sealing device 1, and the integrated mixing and sealing device 1 and the two stagnation flow strong blocking devices are coaxial and can be connected to each other through a limiting steel wire rope 2. The integrated sealer 1 is a main body for storing, mixing, reacting, and releasing a sealing liquid.
The integrated mixed sealer 1 comprises an inner layer pipe 11, a middle layer pipe 12, an outer layer pipe 13, a front sealing end cover 14 and a rear sealing end cover 15, wherein the inner layer pipe 11, the middle layer pipe 12 and the outer layer pipe 13 are coaxially sleeved from inside to outside and are mutually independent and sealed; sealing sieve holes 16 are arranged on the middle-layer pipe 12 and the outer-layer pipe 13, a hole breaker 17 and a liquid pushing piston 18 are sequentially sleeved on the inner-layer pipe 11, and the hole breaker 17 and the liquid pushing piston 18 are positioned between the front sealing end cover 14 and the rear sealing end cover 15; the inner pipe 11 can penetrate through the front sealing end cover 14 and the rear sealing end cover 15 in a sealing mode, and the inner pipe 11, the front sealing end cover 14 and the rear sealing end cover 15 are in dynamic sealing so that the isolated hole sealing liquid storage chamber does not leak upwards in the axial direction any more.
The two stagnant flow strong blocking devices are respectively sleeved on the inner-layer pipe 11 penetrating through the front sealing end cover 14 and the rear sealing end cover 15; the stagnation strong plugging device comprises a layer of reticular stagnation cotton yarn 3 sleeved on the inner layer pipe 11, a reverse plugging rubber mat 4 sleeved outside the layer of reticular stagnation cotton yarn 3 and two sealing end covers arranged at two ends of the layer of reticular stagnation cotton yarn 3 and the reverse plugging rubber mat 4; an inner layer pipe 11 penetrating out of the viscous flow strong plugging device is connected with a screen pipe 5 in an extraction pipe hole; an inner layer pipe 11 penetrating out of the other stagnant flow strong plugging device is connected with an outer gas extraction pipe 6 with a hole, and the stagnant flow strong plugging device can be connected with an orifice baffle 7 arranged at a drill hole orifice through a limiting steel wire pull rope 2. The limiting steel wire pull rope 2 is connected with the orifice baffle, the rear viscous flow strong plugging device, the integrated mixed plugging device and the front viscous flow strong plugging device, so that when the inner layer pipe (namely the reinforced extraction pipe) is pushed axially, the middle layer pipe, the outer layer pipe, the front viscous flow strong plugging device and the rear viscous flow strong plugging device of the integrated mixed plugging device are fixed with the orifice baffle, a liquid pushing piston and a hole breaking device in the integrated mixed plugging device can move relative to the middle layer pipe and the outer layer pipe of the integrated mixed plugging device, and flowing mixing and reaction expansion of A, B hole sealing liquid are realized.
In this embodiment, the stagnant flow strong blocking device comprises a front stagnant flow strong blocking device 8 and a rear stagnant flow strong blocking device 9, the front stagnant flow strong blocking device 8 is sleeved on an inner pipe 11 penetrating through a front sealing end cover 14, and the rear stagnant flow strong blocking device 9 is sleeved on an inner pipe 11 penetrating through a rear sealing end cover 15; the inner layer pipe 11 can move axially relative to the front viscous flow strong blocking device 8 and the rear viscous flow strong blocking device 9; of the two sealing end covers of the front stagnation strong plugging device 8, the sealing end cover 81 close to the screen pipe 5 in the extraction pipe hole, the sealing end cover 82 close to the integrated mixed plugging device 1, and an end cover pull ring is arranged on the sealing end cover 82 to connect the limiting steel wire pull rope 2; sealing end cover fasteners are arranged at the joints of the first sealing end cover 81 and the second sealing end cover 82 with the inner-layer pipe 11; of the two sealing end covers of the rear stagnation strong plugging device 9, the sealing end cover 91 close to the integrated mixed sealing device 1, the sealing end cover 92 close to the gas extraction pipe 6 outside the hole, and end cover pull rings for connecting the limiting steel wire pull rope 2 are arranged on the third sealing end cover 91 and the fourth sealing end cover 92; and sealing end cover fasteners are arranged at the joints of the third sealing end cover 91 and the fourth sealing end cover 92 and the inner-layer pipe 11.
The reverse plugging rubber mat 4 of the viscous flow strong plugging device can be tightly attached to the inner wall of the drill hole, so that the layer of the reticular viscous flow cotton yarn 3 and the reverse plugging rubber mat 4 can prevent the hole sealing liquid from flowing towards the inner direction and the outer direction of the drill hole, and the hole sealing liquid can fully reflect expansion and be quickly solidified.
The hole breaker 17 comprises an annular main body and a plurality of elastic tips distributed along the circumferential direction of the annular main body, and the elastic tips can stretch out and draw back in the radial direction; the elastic tip portion is compressed by the inner wall of the middle layer pipe 12, when the hole breaking device 17 axially moves along with the inner layer pipe 11 to reach the position of the sealing sieve hole 16 of the middle layer pipe 12, the elastic tip portion radially extends out to puncture a sealing film on the sealing sieve hole 16, so that the liquid pushing piston behind the hole breaking device 17 pushes the sealing liquid of the B sealing liquid storage chamber in the front middle layer pipe to flow and mix to the A sealing liquid storage chamber, and simultaneously pumps at the rear to make the sealing liquid of the A sealing liquid storage chamber flow to the B sealing liquid storage chamber to further mix, as shown in fig. 5, the hole sealing materials are pushed by the integrated sealing device to mix to generate a reaction schematic diagram (a, initial pushing, B, middle pushing and c, pushing are completed).
The liquid pushing piston 18 is sleeved on the inner layer pipe 11 and clings to the inner wall of the middle layer pipe 12, and two piston baffles 19 clinging to the liquid pushing piston 18 are arranged at two sides of the liquid pushing piston 18; the piston baffle plate 19 is fixedly sleeved on the inner layer pipe 11.
The front sealing end cover 14 and the rear sealing end cover 15 are both provided with end cover pull rings for connecting the limiting steel wire pull rope 2; and sealing end cover fasteners are arranged at the joints of the front sealing end cover 14 and the rear sealing end cover 15 and the inner-layer pipe 11.
The front sealing end cover 14 is fixedly connected with the end parts of the outer layer pipe 13 and the middle layer pipe 12, the rear sealing end cover 15 is fixedly connected with the other end part of the outer layer pipe 13 and the middle layer pipe 12, a closed annular space between the outer layer pipe 13 and the middle layer pipe 12 is an A hole sealing liquid storage chamber, and a closed annular space between the middle layer pipe 12 and the inner layer pipe 11 is a B hole sealing liquid storage chamber. The liquid pushing piston pushes the hole sealing liquid in the hole sealing liquid storage chamber B in the middle-layer pipe in front to flow and mix to the hole sealing liquid storage chamber A, and meanwhile, the liquid is sucked from the rear, so that the hole sealing liquid in the hole sealing liquid storage chamber A flows to the hole sealing liquid storage chamber B and further mixes.
The former stagnant flow is stifled the ware 8 by force and can connect one or more an organic whole through spacing steel wire stay cord 2 and mix and seal ware 1 between the stifled ware 9 of the stagnant flow behind, can set up the quantity that an organic whole mixed and seal the ware according to actual need, can set up A, B hole sealing liquid in foremost and rearmost an organic whole mixed and seal the ware simultaneously and solidify the material for quick reaction expansion, and the centre is that reaction rate is slower, the bigger material of expansion rate to strengthen the hole sealing effect.
The hole sealing principle of the integrated mixed sealer is as follows: a, B hole sealing liquid is stored in an A hole sealing liquid storage chamber and a B hole sealing liquid storage chamber in the integrated sealing device, an inner layer pipe moves axially to drive a hole breaking device and a liquid pushing piston to move, an elastic tip of the hole breaking device extends out radially to pierce a sealing film on a sealing sieve hole of the middle layer pipe, the liquid pushing piston behind the hole breaking device pushes the hole sealing liquid of the B hole sealing liquid storage chamber in a front middle layer pipe to flow and mix towards the A hole sealing liquid storage chamber, meanwhile, the liquid is sucked at the rear part, the A hole sealing liquid in the A hole sealing liquid storage chamber flows towards the B hole sealing liquid storage chamber to be further mixed with A, B hole sealing liquid to generate reaction and expansion after mixing, expansion pressure and released heat force to break the sealing sieve hole of an outer layer pipe, hole sealing materials reach the positions between a drilling wall and a front viscous flow strong plugging device and a rear viscous flow strong plugging device through holes, the front and rear expanded hole sealing materials are quickly solidified under the retardation of the front and viscous flow strong plugging devices, the liquid in the middle part continues to expand and compact the hole wall, and finishing the expansion hole sealing.
Example 2:
in the method, a hole breaker is driven to puncture sealing sieve holes of a middle-layer pipe to conduct an A hole sealing liquid storage chamber and a B hole sealing liquid storage chamber through axial movement of the inner-layer pipe, and a liquid pushing piston enables the A hole sealing liquid and the B hole sealing liquid to be mixed to generate an expansion reaction; the obtained hole sealing material expansion pressure and the released heat force the outer layer pipe sealing sieve pores to break, the hole sealing material reaches the positions between the drill hole wall and the front viscous flow strong plugging device and the rear viscous flow strong plugging device through the pores, the front and rear expanded hole sealing materials are quickly solidified under the retardation of the front viscous flow strong plugging device and the rear viscous flow strong plugging device, and the middle hole sealing material continues to expand and compact the drill hole wall, so that the expansion hole sealing is completed.
The method comprises the following steps:
the method comprises the following steps: determining the number of the required integrated mixed seal devices and the length of an inner layer pipe according to the hole sealing depth required by drilling in the coal seam, sequentially assembling the integrated mixed seal devices according to the sequence of the front viscous flow strong plug device, the integrated mixed seal device and the rear viscous flow strong plug device, hanging a limiting steel wire pull rope and sending the limiting steel wire pull rope into the drilling hole;
step two: after the device reaches the designated position in the drill hole, the orifice baffle is connected with the limiting steel wire pull rope, and then the orifice baffle is arranged in the orifice and fixed;
step three: pushing the inner-layer pipe to move axially, stopping pushing after the pushing limiting distance of the integrated mixed sealing device is reached, waiting for the uniform mixing of the sealing liquid in the hole sealing device to react, enabling the sealing sieve pores of the outer-layer pipe to be broken by expansion pressure and released heat, and enabling the hole sealing material to flow into the front viscous flow strong blocking device, the rear viscous flow strong blocking device and the hole wall to continue to expand;
step four; and after the hole sealing material is solidified for 10 minutes, connecting the inner-layer pipe with the gas extraction pipe outside the hole, and finishing hole sealing and extraction operation.
Claims (10)
1. A push type in-hole integrated rapid hole sealing device is characterized by comprising an integrated mixed sealer (1), wherein two viscous flow strong plugging devices are arranged on two sides of the integrated mixed sealer (1), and the integrated mixed sealer (1) and the two viscous flow strong plugging devices are coaxial and can be connected with each other through a limiting steel wire pull rope (2);
the integrated mixed sealer (1) comprises an inner layer pipe (11), a middle layer pipe (12), an outer layer pipe (13), a front sealing end cover (14) and a rear sealing end cover (15), wherein the inner layer pipe, the middle layer pipe and the outer layer pipe are coaxially sleeved from inside to outside and are mutually independently sealed and separated; sealing sieve holes (16) are formed in the middle-layer pipe (12) and the outer-layer pipe (13), a hole breaking device (17) and a liquid pushing piston (18) are sequentially sleeved on the inner-layer pipe (11), and the hole breaking device (17) and the liquid pushing piston (18) are located between the front sealing end cover (14) and the rear sealing end cover (15); the inner-layer pipe (11) can penetrate through the front sealing end cover (14) and the rear sealing end cover (15) in a sealing manner, and the inner-layer pipe (11) is in dynamic sealing with the front sealing end cover (14) and the rear sealing end cover (15);
the two stagnant flow strong blocking devices are respectively sleeved on the inner-layer pipe (11) penetrating through the front sealing end cover (14) and the rear sealing end cover (15), and the inner-layer pipe (11) can axially move relative to the two stagnant flow strong blocking devices; the stagnation strong blocking device comprises a layer of reticular stagnation cotton yarn (3) sleeved on the inner layer pipe (11), a reverse blocking rubber mat (4) sleeved outside the layer of reticular stagnation cotton yarn (3), and two sealing end covers arranged at two ends of the layer of reticular stagnation cotton yarn (3) and the reverse blocking rubber mat (4); an inner layer pipe (11) penetrating out of the viscous flow strong plugging device is connected with a screen pipe (5) in an extraction pipe hole; an inner layer pipe (11) penetrating out of the other stagnant flow strong plugging device is connected with an outside-hole gas extraction pipe (6), and the stagnant flow strong plugging device can be connected with an orifice baffle (7) arranged at a drill hole orifice through a limiting steel wire pull rope (2).
2. The push-type hole internal integrated rapid hole sealing device as claimed in claim 1, wherein the stagnation flow strong plug comprises a front stagnation flow strong plug (8) and a rear stagnation flow strong plug (9), the front stagnation flow strong plug (8) is sleeved on the inner pipe (11) penetrating through the front sealing end cover (14), and the rear stagnation flow strong plug (9) is sleeved on the inner pipe (11) penetrating through the rear sealing end cover (15); the inner layer pipe (11) can move axially relative to the front viscous flow strong blocking device (8) and the rear viscous flow strong blocking device (9);
of the two sealing end covers of the front stagnant flow strong plugging device (8), the sealing end cover (81) close to the screen pipe (5) in the pumping pipe hole and the sealing end cover (82) close to the integrated mixed plugging device (1) are respectively a first sealing end cover (81) and a second sealing end cover (82), and the second sealing end cover (82) is provided with an end cover pull ring for connecting a limiting steel wire pull rope (2); sealing end cover fasteners are arranged at the joints of the first sealing end cover (81) and the second sealing end cover (82) and the inner-layer pipe (11);
among the two sealing end covers of the rear stagnation strong plugging device (9), the sealing end cover close to the integrated mixed sealing device (1) is a third sealing end cover (91), the sealing end cover close to the gas extraction pipe (6) outside the hole is a fourth sealing end cover (92), and end cover pull rings are arranged on the third sealing end cover (91) and the fourth sealing end cover (92) and used for connecting a limiting steel wire pull rope (2); sealing end cover fasteners are arranged at the joints of the third sealing end cover (91) and the fourth sealing end cover (92) and the inner-layer pipe (11).
3. A push-type downhole integrated rapid hole sealing device according to claim 1, wherein the reverse plugging rubber pad (4) of the viscous flow strong plugging device can be tightly attached to the inner wall of the borehole, so that the layer of netted viscous flow cotton yarn (3) and the reverse plugging rubber pad (4) can block the flow of the sealing liquid in the inner direction and the outer direction of the borehole, and the sealing liquid can fully reflect the expansion and rapid consolidation.
4. The push-type hole internal rapid sealing device as claimed in claim 1, wherein the hole breaker (17) comprises an annular body and a plurality of elastic tips arranged along the circumference of the annular body, and the elastic tips can stretch out and draw back in the radial direction; the elastic tip part is compressed by the inner wall of the middle layer pipe (12), and when the hole breaking device (17) axially moves along with the inner layer pipe (11) to reach the position of the sealing sieve hole (16) of the middle layer pipe (12), the elastic tip part radially extends out to be capable of puncturing the sealing film on the sealing sieve hole (16).
5. The push-type hole internal quick sealing device as claimed in claim 1, wherein the liquid pushing piston (18) is sleeved on the inner pipe (11) and tightly attached to the inner wall of the middle pipe (12), and two piston baffles (19) tightly attached to the liquid pushing piston (18) are arranged on two sides of the liquid pushing piston (18); the piston baffle (19) is fixedly sleeved on the inner layer pipe (11).
6. The push-type hole internal rapid sealing device as claimed in claim 2, wherein the front sealing end cap (14) and the rear sealing end cap (15) are provided with end cap pull rings for connecting the limiting steel wire pull rope (2); and sealing end cover fasteners are arranged at the joints of the front sealing end cover (14) and the rear sealing end cover (15) and the inner-layer pipe (11).
7. The push-type hole internal integrated rapid hole sealing device according to claim 2, wherein the front sealing end cap (14) is fixedly connected with the end parts of the outer layer pipe (13) and the middle layer pipe (12), the rear sealing end cap (15) is fixedly connected with the other end parts of the outer layer pipe (13) and the middle layer pipe (12), the closed annular space between the outer layer pipe (13) and the middle layer pipe (12) is an A hole sealing liquid storage chamber, and the closed annular space between the middle layer pipe (12) and the inner layer pipe (11) is a B hole sealing liquid storage chamber.
8. The push-type downhole integrated rapid hole sealing device according to claim 2, wherein one or more integrated sealing mixers (1) can be connected between the front stagnation flow strong plug (8) and the rear stagnation flow strong plug (9) through a limiting steel wire pull rope (2).
9. A method for integrally and rapidly sealing holes in a push-type hole is characterized in that the method is realized by the push-type hole internal integrated rapid sealing device disclosed by claim 7, the method drives a hole breaker to puncture sealing sieve holes of a middle-layer pipe to conduct a hole sealing liquid storage chamber A and a hole sealing liquid storage chamber B through axial movement of the inner-layer pipe, and a liquid pushing piston enables the hole sealing liquid A and the hole sealing liquid B to be mixed to generate an expansion reaction; the obtained hole sealing material expansion pressure and the released heat force the outer layer pipe sealing sieve pores to break, the hole sealing material reaches the positions between the drill hole wall and the front viscous flow strong plugging device and the rear viscous flow strong plugging device through the pores, the front and rear expanded hole sealing materials are quickly solidified under the retardation of the front viscous flow strong plugging device and the rear viscous flow strong plugging device, and the middle hole sealing material continues to expand and compact the drill hole wall, so that the expansion hole sealing is completed.
10. The method for integrally and rapidly sealing the hole in the push-type hole according to claim 9, wherein the method comprises the following steps:
the method comprises the following steps: determining the number of the required integrated mixed seal devices and the length of an inner layer pipe according to the hole sealing depth required by drilling in the coal seam, sequentially assembling the integrated mixed seal devices according to the sequence of the front viscous flow strong plug device, the integrated mixed seal device and the rear viscous flow strong plug device, hanging a limiting steel wire pull rope and sending the limiting steel wire pull rope into the drilling hole;
step two: after the device reaches the designated position in the drill hole, the orifice baffle is connected with the limiting steel wire pull rope, and then the orifice baffle is arranged in the orifice and fixed;
step three: pushing the inner pipe, stopping pushing after the pushing limiting distance of the integrated mixed sealer is reached, waiting for the uniform mixing of the sealing liquid in the hole sealing device to react, enabling the sealing sieve pores of the outer pipe to be broken by expansion pressure and released heat, and enabling the sealing material to flow into the front viscous flow strong sealer, the rear viscous flow strong sealer and the hole wall to continue to expand;
step four; and after the hole sealing material is solidified for 10 minutes, connecting the inner-layer pipe with the gas extraction pipe outside the hole, and finishing hole sealing and extraction operation.
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| CN111827919B (en) * | 2020-07-23 | 2021-03-30 | 大庆长垣能源科技有限公司 | Gas channeling prevention metal sealing open hole packer |
| CN111852392A (en) * | 2020-08-07 | 2020-10-30 | 中煤科工集团重庆研究院有限公司 | Gas extraction borehole leak detection and progressive secondary hole sealing device and using method |
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