CN114016920B - Underground coal mine large-diameter casing pipe lowering device and method - Google Patents
Underground coal mine large-diameter casing pipe lowering device and method Download PDFInfo
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- CN114016920B CN114016920B CN202111282606.5A CN202111282606A CN114016920B CN 114016920 B CN114016920 B CN 114016920B CN 202111282606 A CN202111282606 A CN 202111282606A CN 114016920 B CN114016920 B CN 114016920B
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- 239000003245 coal Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 20
- 210000004907 gland Anatomy 0.000 claims abstract description 17
- 238000005553 drilling Methods 0.000 claims description 25
- 239000012530 fluid Substances 0.000 claims description 19
- 238000011010 flushing procedure Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a device and a method for lowering a large-diameter sleeve in a coal mine, wherein the device comprises a joint, an outer pipe, an inner pipe, a piston assembly, a deformable rubber core and a gland; the joint is provided with a central through hole, one end of the joint is coaxially connected with the outer pipe, and the other end of the joint is used for connecting a drill rod; the outer wall of the joint is provided with a sleeve supporting table for supporting the end part of the sleeve, and the outer contour diameter of the sleeve supporting table is larger than the outer diameter of the sleeve; one end of the outer tube is open, and an inner annular seat is arranged on the inner wall of the other end of the outer tube; one end of the inner tube is closed, and the other end is open; the piston assembly comprises a piston cylinder and a spring, and a first outer annular seat and a second outer annular seat are respectively arranged on the outer walls of the two ends of the piston cylinder; the device can effectively solve the problem of difficult connection and release of the underground large-diameter sleeve of the coal mine, completely liberates manpower, effectively reduces the workload of workers, shortens the sleeve release period and improves the construction safety.
Description
Technical Field
The invention belongs to the technical field of drilling equipment, and particularly relates to a device and a method for lowering a large-diameter casing in a coal mine.
Background
The aperture of the conventional drilling hole for underground construction of the coal mine is basically not more thanBecause of the small diameter, the application effect and the range are limited to a certain extent. In recent years, with the improvement of large diameter drilling construction technology and equipment, a large diameter drilling is constructed by>In goaf gas extraction, roadway ventilation, rescue, underground pipeline laying and the likeThe method has more application and obvious advantages. In the early stage of large-diameter drilling construction, a sleeve is required to be put into the hole sealing at the hole opening end of the drill hole, so that the foundation for ensuring large displacement adjustment of the drilling track, high-pressure water-containing body and gas control and formation breaking protection is provided; in the later stage of construction, in order to avoid the influence of the hole collapse on the later stage of drilling due to the partial stratum fracture of the drilling, the drilling hole protection sleeve needs to be lowered to a specific depth. The specification and the lowering depth of the casing pipe are determined by combining engineering purposes and geological conditions, and are lowered into place according to drilling construction requirements. For bore diameter->Inside large diameter drilling, coal mine underground is mostly adoptedThe length of a single pipe is 1-1.5 m, the weight of the single pipe is more than 25Kg, and most of the pipes are in threaded connection in order to ensure the integrity and the connection strength of the pipes.
The underground coal mine construction site has limited operable space, when the height of the hole drilled by the large-diameter drill hole is high or the design angle of the drill hole is large, a plurality of constructors are required to wear the safety rope to stand on the scaffold for manually centering and manually screwing the sleeve, the sleeve is clamped by the drill rod through the drill power head, and the sleeve is propped into the hole after being connected, and the sleeve is easily inclined due to uneven stress in the process, so that the continuous lowering of the sleeve is influenced. When the casing pipe is large in the depth, the workload of workers is large, the casing pipe connecting period is long, and the safety of high-altitude operation is poor.
Disclosure of Invention
Aiming at the technical problems, the invention provides a device and a method for lowering a large-diameter sleeve in a coal mine, which solve the problems that the conventional large-diameter sleeve is mainly operated manually, the workload is large and the safety risk is high.
In order to solve the technical problems, the invention adopts the following technical scheme:
a coal mine underground large-diameter sleeve lowering device comprises a joint, an outer pipe, an inner pipe, a piston assembly, a deformable rubber core and a gland;
the joint is provided with a central through hole, one end of the joint is coaxially connected with the outer pipe, and the other end of the joint is used for connecting a drill rod; the outer wall of the joint is provided with a sleeve supporting table for supporting the end part of the sleeve, and the outer contour diameter of the sleeve supporting table is larger than the outer diameter of the sleeve;
one end of the outer tube is open, and an inner annular seat is arranged on the inner wall of the other end of the outer tube; one end of the inner tube is closed, and the other end of the inner tube is open;
the piston assembly comprises a piston cylinder and a spring, and a first outer annular seat and a second outer annular seat are respectively arranged on the outer walls of the two ends of the piston cylinder; the piston cylinder is sleeved on the inner pipe, the first outer annular seat end is arranged in the outer pipe, the outer diameter of the first outer annular seat is matched with the inner diameter of the outer pipe, and the second outer annular seat end is arranged outside the outer pipe; the spring is sleeved on the piston cylinder, and two ends of the spring are respectively pressed against the inner annular seat and the first outer annular seat;
the rubber core and the gland are both sleeved on the inner pipe, the rubber core is arranged between the second outer annular seat and the gland, and a deformation cavity is formed in the rubber core; the closed end of the inner tube is fixedly connected with the outer tube, and the gland is fixedly connected with the wall of the outer tube.
Preferably, the sleeve support table is composed of a plurality of first support plates disposed circumferentially around the joint.
Preferably, a pressure relief hole is arranged on the pipe wall close to the closed end of the inner pipe.
Preferably, the contact surface of the rubber core and the second outer annular seat and the contact surface of the rubber core and the gland are all in concave-convex nested structures.
Preferably, the connector is provided with a pressure detection hole communicated with the central through hole and used for connecting a pressure gauge or a pressure gauge oil pipe.
Specifically, the closed end of the inner tube is connected with the outer tube through a fixing ring, and the fixing ring is provided with an overflow hole.
Preferably, at least two supporting pieces for righting the sleeve are arranged on the outer wall of the open end of the inner tube or the outer wall of the outer tube, and the outer contour diameter of each supporting piece is smaller than the inner diameter of the sleeve.
Specifically, support piece includes the connection pad and sets up the second backup pad on the connection pad outer wall, the second backup pad is provided with a plurality ofly around connection pad circumferencial direction.
The invention also discloses a method for lowering the underground large-diameter sleeve of the coal mine, which adopts the device for lowering the underground large-diameter sleeve of the coal mine, and comprises the following steps:
step 1, a first casing pipe setting method comprises the following steps: connecting a joint of the underground coal mine large-diameter casing pipe lowering device with a drill rod, inserting the underground coal mine large-diameter casing pipe lowering device into a casing pipe to be lowered, pushing the end part of the casing pipe to be lowered against a casing pipe supporting table, and operating a drilling machine to drive the drill rod to move forward so as to drive the underground coal mine large-diameter casing pipe lowering device to move forward, wherein the casing pipe to be lowered enters a drill hole under the action of pushing force of the casing pipe supporting table;
step 2, the subsequent sleeve pipe splicing and lowering method comprises the following steps: withdrawing the underground coal mine large-diameter casing pipe lowering device, and inserting the underground coal mine large-diameter casing pipe lowering device into the next casing pipe to be lowered; the rear end of the drill rod is connected with a water feeder, a slurry pump is operated to inject flushing fluid into the drill rod, the flushing fluid enters a central through hole of the joint, the piston cylinder is pushed to move, the rubber core is extruded and expanded in the radial direction, and after the sleeve is put down, the flushing fluid is stopped being injected; operating the drilling machine to enable the lowered casing to be in butt joint with the previous casing;
continuously operating the drilling machine to enable the underground large-diameter casing pipe lowering device of the coal mine to move forwards, and enabling the well-spliced casing pipe to enter a drilled hole under the pushing force of the casing pipe supporting table;
the slurry pump is depressurized, the piston cylinder moves upwards under the reaction force of the spring, and the rubber core is restored to loosen the sleeve;
and 3, repeating the step 2 until the addition and the lowering of the orifice sleeve or the guard hole sleeve with the specified depth are completed.
Preferably, a pressure gauge is arranged at the joint, and whether to stop pouring the flushing fluid is determined according to the change of the pressure value on the pressure gauge, specifically: when the reading of the pressure gauge is obviously reduced, the flushing fluid enters the pressure relief hole, the piston cylinder is moved to a preset position, and water injection is stopped at the moment.
Compared with the prior art, the invention has the beneficial effects that:
(1) The device can effectively solve the problems of difficult connection and release of the underground large-diameter sleeve of the coal mine, completely liberates manpower, effectively reduces the workload of workers, shortens the sleeve release period and improves the construction safety;
(2) The expansion and recovery of the rubber core are controlled only by the water pressure and the built-in spring, the control source is single, the operation is simple, and the lowering tool is provided with the pressure gauge and the pressure relief hole, so that the safety coefficient is high;
(3) The device has the advantages of simple structure, convenient assembly and disassembly, and few easily damaged parts, and can adapt to the use of the sleeves with different sizes through changing the rubber core and the supporting parts.
(4) The device can be connected with underground drill rods with various specifications, and has strong adaptability; the sleeve is well neutral under the limiting action of the supporting piece, the sleeve supporting table is arranged at the joint, and the sleeve is uniformly stressed when being pushed, so that the sleeve is effectively prevented from inclining in the jacking process.
Other advantages of the present invention are described in detail in the detailed description.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a coal mine underground large-diameter casing running device according to an embodiment of the invention.
Fig. 2 is a schematic view of a joint according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view A-A of fig. 2.
Fig. 4 is a schematic view of the structure of an outer tube according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of an inner tube according to an embodiment of the present invention.
Fig. 6 is a schematic view of a piston cylinder according to an embodiment of the present invention.
Fig. 7 is a schematic structural view of a rubber core according to an embodiment of the present invention.
Fig. 8 is a schematic structural view of one of the supporting members according to the embodiment of the present invention.
Fig. 9 is a B-B cross-sectional view of fig. 8.
Fig. 10 is a schematic view of another support member according to an embodiment of the present invention.
The reference numerals in the drawings illustrate:
1-joint, 2-outer tube, 3-inner tube, 4-piston assembly, 5-rubber core, 6-gland, 7-fixed ring, 8-support piece, 9-pressure gauge;
11-a central through hole, 12-a sleeve supporting table and 13-a pressure detection hole; 121-a first support plate;
21-an inner annular seat; 31-a pressure relief hole;
41-piston cylinder, 42-spring, 43-first outer annular seat, 44-second outer annular seat;
51-first through holes, 52-annular grooves;
71-overflow holes; 81-connecting disc, 82-second backup pad.
Detailed Description
In the following description of the present invention, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and the like should be construed broadly, and may be, for example, fixedly connected or detachably connected or integrated; either direct or indirect connection, etc. The specific meaning of the above terms in the present technical solution can be understood by those skilled in the art according to specific circumstances.
In the present invention, unless otherwise indicated, terms such as "upper, lower, bottom, top" and "upper" are used to refer to the definition of the figure plane of the corresponding figure, the definition of "inner and outer" are used to refer to the definition of the figure plane of the corresponding figure, and the definition of "front and rear" are used to refer to the definition of the direction of gas flow.
The present invention is not limited to the following specific embodiments, and the respective specific technical features described in the following specific embodiments may be combined in any suitable manner without contradiction as long as they do not deviate from the idea of the present invention and should also be regarded as the disclosure of the present invention.
Example 1
The embodiment discloses a coal mine underground large-diameter casing pipe lowering device, which comprises a joint 1, an outer pipe 2, an inner pipe 3, a piston assembly 4, a deformable rubber core 5 and a gland 6 as shown in figure 1.
The joint 1 is provided with a central through hole 11, one end of the joint 1 is coaxially connected with the outer pipe 2, the other end of the joint is used for connecting a drill rod, and the joint 1 is particularly connected with the outer pipe 2 and the drill rod through threads.
The outer wall of the joint 1 is provided with a sleeve supporting table 12 for supporting the end part of the sleeve, and the outer contour diameter of the sleeve supporting table 12 is larger than the outer diameter of the sleeve. When the sleeve is nested on the running device, its end can be pushed against the sleeve support table 12. Specifically, the sleeve support table 12 is composed of a plurality of first support plates 121 disposed circumferentially around the joint, and 4 first support plates 121 are shown in this embodiment, as shown in fig. 2.
The outer tube 2 is open at one end and is provided with an inner annular seat 21 on the inner wall of the other end, and the inner diameter of the inner annular seat 21 is matched with the outer diameter of the piston cylinder 42, as shown in fig. 4.
The piston assembly 4 comprises a piston cylinder 41 and a spring 42, wherein a first outer annular seat 43 and a second outer annular seat 44 are respectively arranged on the outer walls of the two ends of the piston cylinder 41, the first outer annular seat 43 is in threaded connection with the piston cylinder 41, and the second outer annular seat 44 and the piston cylinder are in an integral structure as shown in fig. 6; the piston cylinder 41 is sleeved on the inner tube 3, the end of the first outer annular seat 43 is arranged in the outer tube 2, the outer diameter of the first outer annular seat 43 is matched with the inner diameter of the outer tube 2, the end of the second outer annular seat 44 is arranged outside the outer tube 2, the spring 42 is sleeved on the piston cylinder 41, and two ends of the spring 42 are respectively propped against the inner annular seat 21 and the first outer annular seat 43, as shown in fig. 1.
The rubber core 5 is provided with a first through hole 51, the rubber core 5 is provided with a deformation cavity, as shown in fig. 7, specifically, the deformation cavity is an annular groove 52 arranged in the middle of the wall of the first through hole 51, the specification and the size of the annular groove 52 mainly depend on the radial expansion amount of the rubber core 5 after being completely compressed, and the rubber core with proper expansion amount is reasonably selected according to the required size and specification of the casing to be lowered. The radial expansion amount of the rubber core 5 ensures that the side surface of the rubber core 5 after expansion can be extruded and propped against the inner wall surface of the sleeve so as to tightly hold the sleeve, and the rubber core 5 is convenient to be in threaded butt joint with the previous section of sleeve. The gland 6 is provided with a second through hole, the diameters of the first through hole 51 and the second through hole are matched with the outer diameter of the inner tube 3, the rubber core 5 and the gland 6 are respectively sleeved on the inner tube 3, and the rubber core 5 is arranged between the second outer annular seat 44 and the gland 6.
One end of the inner tube 3 is closed, the other end is open, the closed end of the inner tube 3 is fixedly connected with the outer tube 2, in particular, the closed end of the inner tube 3 is connected with the outer tube 2 through a fixed ring 7, the fixed ring 7 is of a circular ring structure, the circular ring is provided with a plurality of through holes 71 for flushing fluid to flow, and the through holes 71 are uniformly arranged at intervals along the circumference of the fixed ring 7; threads are arranged on the inner wall and the outer wall of the circular ring, so that the fixing ring 7 is convenient to connect with the inner pipe 3 and the outer pipe 2. The gland 6 is fixedly connected with the pipe wall of the outer pipe 2, and is in particular also in threaded connection.
As a preferred embodiment of this example, a pressure relief hole 31 is provided in the tube wall near the closed end, as shown in fig. 5. The pressure release holes 31 are uniformly distributed along the circumferential direction of the inner tube 3, and function to prevent the rubber core 5 from being too compressed to exceed the yield strength and recover. The principle is that after the flushing fluid pushes the piston cylinder 41 to move to the right side as shown in fig. 1 for a certain distance, the pressure relief hole 31 is exposed out of the piston cylinder 41, the flushing fluid flows into the pressure relief hole 31 and flows out along the inner tube 3 to realize pressure relief, and the rubber core 5 is prevented from being further compressed.
As a preferred implementation manner of the embodiment, the contact surface between the rubber core 5 and the second outer annular seat 44 and the contact surface between the rubber core 5 and the gland 6 are all in concave-convex nested structures, so that stability is improved.
As a preferred embodiment of this example, a support 8 for righting the sleeve is provided on the outer wall of the open end of the inner tube 3 or on the outer wall of the outer tube 2, the outer contour diameter of the support 8 is slightly smaller than the inner diameter of the sleeve, the contour gap between the two is 1-2 mm, and at least two support 8 are provided to ensure the centering of the sleeve. In this embodiment, one is provided on the outer wall of the open end of the inner tube 3 and one is provided on the outer wall of the outer tube 2, respectively, as shown in fig. 1. It should be noted that the shape of the support 8 at the inner tube 3 and the support 8 at the outer tube 2 are slightly different, as shown in fig. 8 and 10, respectively, to match the outer diameters of the outer tube 2 and the inner tube 3, but the outermost ring profile diameters of the two are the same.
As shown in fig. 8 to 10, the support member 8 of the present embodiment includes a connection pad 81 and a second support plate 82 provided on an outer wall of the connection pad 81, the second support plate 82 being provided in plurality around a circumferential direction of the connection pad 81; the connection disc 81 is connected with the outer wall of the inner tube 3 or the outer wall of the outer tube 2 through threads, and the second support plate 82 is welded on the outer wall of the connection disc 81. More preferably, the second support plate 82 of this embodiment is a sector plate, and the contact area between the second support plate 82 and the sleeve is increased, and the inner ring of the sector plate is connected to the outer wall of the connecting disc 81.
As a preferred embodiment of the present example, a pressure detection hole 13 penetrating the center through hole 11 is provided in the joint 1 for connecting a pressure gauge or a pressure gauge oil pipe. The device has the function of observing the fluid pressure in the central through hole in real time, and determining whether to stop continuing to inject flushing fluid or not through fluctuation of the pressure value in the process of the lower part of the sleeve.
Example 2
The embodiment discloses a method for lowering a coal mine underground large-diameter sleeve, which adopts the coal mine underground large-diameter sleeve lowering device described in the embodiment 1, and comprises the following steps:
step 1, a first casing pipe setting method comprises the following steps: connecting a joint 1 of a coal mine underground large-diameter casing pipe lowering device with a drill rod, lifting the coal mine underground large-diameter casing pipe to be placed at the front end of the lowering device through a hydraulic suspension arm or a chain block, operating a drilling machine, enabling the lowering device to be inserted into the casing pipe, enabling the end of the casing pipe to be lowered to prop against a casing pipe supporting table 12, enabling the casing pipe to be lowered to be basically coincident with the axis of the lowering device under the limiting effect of a supporting piece 8, operating the drilling machine to enable the lowering device to be aligned with the axis of a drilling hole, enabling a power belt of the drilling machine to drive the lowering device to move forwards through the drill rod, and enabling the casing pipe to be lowered to enter the drilling hole under the pushing force of the casing pipe supporting table 12;
step 2, the subsequent sleeve pipe splicing and lowering method comprises the following steps: the drill is operated to withdraw the lowering device, the hydraulic boom or the chain hoist is operated again to hoist the second sleeve to be placed in front of the lowering device, the drill is operated to enable the lowering device to be inserted into the sleeve, the rear end of the drill rod is connected with the water feeder, the slurry pump is operated to inject flushing fluid into the drill rod, the flushing fluid enters the central through hole 11 of the joint 1, the piston cylinder 41 is pushed to move along the right side shown in fig. 1, the rubber core 5 is extruded and expanded in the radial direction, and after the sleeve is lowered, the flushing fluid is stopped after the sleeve is held down. In this embodiment, preferably, a pressure gauge 9 is disposed at the joint 1, and it is determined whether to stop pouring the rinse solution according to the change of the pressure value of the pressure gauge 9, specifically: when the reading of the pressure gauge 9 becomes significantly smaller, it indicates that flushing fluid enters the pressure relief hole 31, and the piston cylinder 41 has moved to a preset position, at which time water injection is stopped.
Then operating the drilling machine to enable the drill rod to rotate and slowly feed, and enabling the rubber core 5 to drive the sleeve to rotate and slowly advance until the sleeve is lowered and screwed with the previous sleeve;
continuing to operate the drilling machine to enable the lowering device to move forwards, and enabling the well-spliced sleeve to enter the drilling hole under the pushing force of the sleeve supporting table 12;
the slurry pump is depressurized, the piston cylinder 41 moves upwards under the reaction force of the spring 42, and the rubber core 5 is restored to loosen the sleeve;
and 3, repeating the step 2 until the addition and the lowering of the orifice sleeve or the guard hole sleeve with the specified depth are completed.
Claims (9)
1. The underground large-diameter casing pipe lowering device for the coal mine is characterized by comprising a joint (1), an outer pipe (2), an inner pipe (3), a piston assembly (4), a deformable rubber core (5) and a gland (6);
the joint (1) is provided with a central through hole (11), one end of the joint (1) is coaxially connected with the outer pipe (2), and the other end of the joint is used for connecting a drill rod; the outer wall of the joint (1) is provided with a sleeve supporting table (12) for supporting the end part of the sleeve, and the outer contour diameter of the sleeve supporting table (12) is larger than the outer diameter of the sleeve;
one end of the outer tube (2) is open, and an inner annular seat (21) is arranged on the inner wall of the other end of the outer tube; one end of the inner tube (3) is closed, and the other end is open;
the piston assembly (4) comprises a piston cylinder (41) and a spring (42), wherein a first outer annular seat (43) and a second outer annular seat (44) are respectively arranged on the outer walls of the two ends of the piston cylinder (41); the piston cylinder (41) is sleeved on the inner pipe (3), the end of the first outer annular seat (43) is arranged in the outer pipe (2), the outer diameter of the first outer annular seat (43) is matched with the inner diameter of the outer pipe (2), and the end of the second outer annular seat (44) is arranged outside the outer pipe (2); the spring (42) is sleeved on the piston cylinder (41), and two ends of the spring (42) are respectively pressed against the inner annular seat (21) and the first outer annular seat (43);
the rubber core (5) and the gland (6) are both sleeved on the inner pipe (3), the rubber core (5) is arranged between the second outer annular seat (44) and the gland (6), and a deformation cavity is formed in the rubber core (5); the closed end of the inner tube (3) is fixedly connected with the outer tube (2), and the gland (6) is fixedly connected with the tube wall of the outer tube (2);
the support piece (8) used for righting the sleeve is arranged on the outer wall of the open end of the inner tube (3) or the outer wall of the outer tube (2), at least two support pieces (8) are arranged, and the outer contour diameter of the support piece (8) is smaller than the inner diameter of the sleeve.
2. A large diameter casing running apparatus in a coal mine as claimed in claim 1 wherein the casing support table (12) is comprised of a plurality of first support plates (121) arranged circumferentially around the joint.
3. A device for lowering a large diameter casing in a coal mine as claimed in claim 1, wherein a pressure relief hole (31) is provided in the wall of the casing near the closed end of the inner pipe (3).
4. The underground coal mine large-diameter casing running device according to claim 1, wherein the contact surface of the rubber core (5) and the second outer annular seat (44) and the contact surface of the rubber core (5) and the gland (6) are all in a concave-convex nested structure.
5. A downhole large diameter casing running apparatus for coal mine according to claim 1, wherein the joint (1) is provided with a pressure detecting hole (13) penetrating the central through hole (11) for connecting a pressure gauge or a pressure gauge oil pipe.
6. The underground coal mine large-diameter casing running device according to claim 1, wherein the closed end of the inner pipe (3) is connected with the outer pipe (2) through a fixing ring (7), and the fixing ring (7) is provided with an overflow hole (71).
7. The underground coal mine large-diameter casing running device according to claim 1, wherein the supporting member (8) comprises a connecting disc (81) and a second supporting plate (82) arranged on the outer wall of the connecting disc (81), and a plurality of second supporting plates (82) are arranged around the circumference of the connecting disc (81).
8. A method for lowering a large-diameter casing in a coal mine, which is characterized in that the device for lowering the large-diameter casing in the coal mine according to any one of claims 1 to 7 is adopted, and the method comprises the following steps:
step 1, a first casing pipe setting method comprises the following steps: connecting a joint (1) of the underground coal mine large-diameter casing pipe lowering device with a drill rod, inserting the underground coal mine large-diameter casing pipe lowering device into a casing pipe to be lowered, pushing the end part of the casing pipe to be lowered against a casing pipe supporting table (12), and operating a drilling machine to drive the drill rod to move forwards so as to drive the underground coal mine large-diameter casing pipe lowering device to move forwards, wherein the casing pipe to be lowered enters a drill hole under the action of pushing force of the casing pipe supporting table (12);
step 2, the subsequent sleeve pipe splicing and lowering method comprises the following steps: withdrawing the underground coal mine large-diameter casing pipe lowering device, and inserting the underground coal mine large-diameter casing pipe lowering device into the next casing pipe to be lowered; the rear end of the drill rod is connected with a water feeder, a slurry pump is operated to inject flushing fluid into the drill rod, the flushing fluid enters a central through hole (11) of the joint (1), the piston cylinder (41) is pushed to move, the rubber core (5) is extruded to expand along the radial direction, and the flushing fluid is stopped after the sleeve is placed by being held tightly; operating the drilling machine to enable the lowered casing to be in butt joint with the previous casing;
continuously operating the drilling machine to enable the underground large-diameter casing pipe lowering device of the coal mine to move forwards, and enabling the well-spliced casing pipe to enter a drilled hole under the pushing force of the casing pipe supporting table (12);
the slurry pump is depressurized, the piston cylinder (41) moves upwards under the reaction force of the spring (42), and the rubber core (5) is restored to loosen the sleeve;
and 3, repeating the step 2 until the addition and the lowering of the orifice sleeve or the guard hole sleeve with the specified depth are completed.
9. The method for lowering a large-diameter underground coal mine casing according to claim 8, wherein a pressure gauge (9) is arranged at the joint (1), and whether flushing fluid injection is stopped is determined according to the change of the pressure value on the pressure gauge (9), specifically: when the reading of the pressure gauge (9) is obviously reduced, the flushing fluid enters the pressure relief hole (31), the piston cylinder (41) is moved to a preset position, and water injection is stopped at the moment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111282606.5A CN114016920B (en) | 2021-11-01 | 2021-11-01 | Underground coal mine large-diameter casing pipe lowering device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201372722Y (en) * | 2009-02-26 | 2009-12-30 | 中国石油天然气集团公司 | Top drive casing running device |
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| CN209444286U (en) * | 2019-01-28 | 2019-09-27 | 重庆广创工贸有限责任公司 | Position aperture guard device and guard aperture tool |
| CN110424921A (en) * | 2019-08-28 | 2019-11-08 | 中研(天津)能源装备有限公司 | A kind of packer |
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| CN201372722Y (en) * | 2009-02-26 | 2009-12-30 | 中国石油天然气集团公司 | Top drive casing running device |
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| CN104832208A (en) * | 2015-03-25 | 2015-08-12 | 宁夏煤炭勘察工程公司 | Anti-collapse method for long-distance horizontal hole drilling in soft coal seam of underground coal mine |
| CN209444286U (en) * | 2019-01-28 | 2019-09-27 | 重庆广创工贸有限责任公司 | Position aperture guard device and guard aperture tool |
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