CN114016920A - Device and method for lowering large-diameter casing pipe in coal mine well - Google Patents
Device and method for lowering large-diameter casing pipe in coal mine well Download PDFInfo
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- CN114016920A CN114016920A CN202111282606.5A CN202111282606A CN114016920A CN 114016920 A CN114016920 A CN 114016920A CN 202111282606 A CN202111282606 A CN 202111282606A CN 114016920 A CN114016920 A CN 114016920A
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- 239000003245 coal Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 24
- 210000004907 gland Anatomy 0.000 claims abstract description 17
- 238000005553 drilling Methods 0.000 claims description 31
- 238000011010 flushing procedure Methods 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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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
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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
- 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
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- 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 casing pipe in a coal mine well, wherein the device comprises a joint, an outer pipe, an inner pipe, a piston assembly, a deformable rubber core and a gland; a central through hole is formed in the joint, 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; a sleeve supporting platform for supporting the end part of the sleeve is arranged on the outer wall of the joint, and the outer contour diameter of the sleeve supporting platform is larger than the outer diameter of the sleeve; one end of the outer pipe is open, and the inner wall of the other end of the outer pipe is provided with an inner annular seat; one end of the inner pipe is closed, and the other end of the inner pipe 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 that the large-diameter casing pipe under the coal mine is difficult to add, connect and lower, completely liberates manpower, effectively reduces the workload of workers, shortens the casing pipe lowering 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 under a coal mine.
Background
The aperture of the conventional drilling hole for the current underground coal mine construction is not more than the aperture of the conventional drilling hole
Because of its small diameter, the application effect and range are limited to a certain extent. In recent years, with the advancement of large-diameter drilling construction techniques and equipment, large-diameter drilling has been carried out by constructing large-diameter drill holes
The method has more applications and obvious advantages in the aspects of goaf gas extraction, roadway ventilation, emergency rescue, underground pipeline laying and the like. In the early stage of large-diameter drilling construction, a sleeve needs to be put into the end of a drill hole to seal the hole, so that the foundation for ensuring large displacement adjustment of a drilling track, control of high-pressure water-bearing bodies and gas and protection of a broken stratum is provided; in the construction later stage, in order to avoid using in the drilling later stage due to the broken hole of collapsing of the local stratum of the drilling, the hole protecting sleeve of the drilling needs to be lowered to a specific depth. The specification and the lowering depth of the casing are determined by combining the engineering purpose and the geological condition, and the casing is lowered in place according to the drilling construction requirement. For the bore hole diameter
Drilling holes with large diameter inside, and adopting in coal mine
The drill way sleeve pipe and the hole protecting sleeve pipe of multiple specifications such as, single length is mostly 1 ~ 1.5m, and single weight is greater than 25Kg, for guaranteeing sheathed tube wholeness and joint strength, most sleeve pipes adopt threaded connection's form.
The connection and the transfer of above-mentioned sheathed tube do not have specialized tool at present, colliery construction site operating space is limited in the pit, when the trompil height of major diameter drilling is higher or drilling design angle is great, need many constructors to wear the safety rope and stand and carry out artifical centering and manual tightening to the sleeve pipe on the scaffold, follow-up through the drilling machine unit head centre gripping drilling rod will add the sleeve pipe that connects and go into downtheholely, the in-process sleeve pipe very easily because of the uneven slope that takes place of atress influences the continuous transfer of sleeve pipe. When the casing running depth is large, the workload of workers is large, the casing jointing 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 casing in a coal mine, which solve the problems of large workload and high safety risk due to the fact that the large-diameter casing is mainly operated manually at present.
In order to solve the technical problems, the invention adopts the following technical scheme:
a large-diameter casing lowering device for a coal mine underground comprises a joint, an outer pipe, an inner pipe, a piston assembly, a deformable rubber core and a gland;
a central through hole is formed in the joint, 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; a sleeve supporting platform for supporting the end part of the sleeve is arranged on the outer wall of the joint, and the outer contour diameter of the sleeve supporting platform is larger than the outer diameter of the sleeve;
one end of the outer pipe is open, and the inner wall of the other end of the outer pipe is provided with an inner annular seat; one end of the inner pipe is closed, and the other end of the inner pipe 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 respectively push against the inner annular seat and the first outer annular seat;
the rubber core and the gland are sleeved on the inner pipe, the rubber core is arranged between the second outer annular seat and the gland, and the rubber core is provided with a deformation cavity; the closed end of the inner tube is fixedly connected with the outer tube, and the gland is fixedly connected with the tube wall of the outer tube.
Preferably, the sleeve supporting table is composed of a plurality of first supporting plates disposed around a circumferential direction of the joint.
Preferably, a pressure relief hole is formed in 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 both arranged in a concave-convex nested structure.
Preferably, the joint 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 an overflowing hole is formed in the fixing ring.
Preferably, the outer wall of the open end of the inner pipe or the outer wall of the outer pipe is provided with at least two supporting pieces for righting the casing pipe, and the diameter of the outer contour of each supporting piece is smaller than the inner diameter of the casing pipe.
Specifically, the 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 the connection pad circumferencial direction.
The invention also discloses a method for lowering the large-diameter casing pipe in the coal mine, which adopts the device for lowering the large-diameter casing pipe in the coal mine, and the specific method comprises the following steps:
continuously operating the drilling machine to enable the large-diameter casing lowering device under the coal mine to move forwards, and enabling the well-connected casing to enter a drill hole under the jacking force of the casing supporting table;
the mud pump releases the pressure, the piston cylinder moves upwards under the counterforce of the spring, and the rubber core recovers to loosen the sleeve;
and 3, repeating the step 2 until the adding, connecting and releasing of the orifice casing or the hole protecting casing with the specified depth are completed.
Preferably, a pressure gauge is arranged at the joint, and whether to stop injecting 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 liquid enters the pressure relief hole, the piston cylinder moves to the preset position, and the water injection is stopped at the moment.
Compared with the prior art, the invention has the beneficial effects that:
(1) by adopting the device, the problem that the large-diameter casing under the coal mine is difficult to add, connect and lower can be effectively solved, the manpower is completely liberated, the workload of workers is effectively reduced, the casing lowering period is shortened, and the construction safety is improved;
(2) the expansion and the recovery of the rubber core are only controlled by 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 sleeves with different dimensions by replacing the rubber core and the supporting part.
(4) The device can be connected with various specifications of underground drill rods, and has strong adaptability; receive support piece limiting displacement, the sleeve pipe is neutral well, and joint department is equipped with a sleeve pipe brace table, and the sleeve pipe atress is even when pushing away the sleeve pipe, effectively avoids the sleeve pipe to push into the in-process and takes place the slope.
Other advantages of the present invention are described in detail in the detailed description of the invention.
Drawings
FIG. 1 is a schematic view of the overall structure of a large-diameter casing lowering device in a coal mine according to an embodiment of the invention.
Fig. 2 is a schematic structural view of a joint according to an embodiment of the present invention.
Fig. 3 is a sectional view a-a of fig. 2.
Fig. 4 is a schematic structural diagram of an outer tube according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an inner tube shown in an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a piston cylinder shown in an embodiment of the invention.
Fig. 7 is a schematic structural diagram 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 sectional view B-B of fig. 8.
Fig. 10 is a schematic structural view of another support member shown in the embodiment of the present invention.
The various reference numbers in the figures illustrate:
1-joint, 2-outer tube, 3-inner tube, 4-piston component, 5-rubber core, 6-gland, 7-fixing ring, 8-support piece, 9-pressure gauge;
11-a central through hole, 12-a sleeve supporting platform and 13-a pressure detection hole; 121-a first support plate;
21-inner annular seat; 31-relief holes;
41-piston cylinder, 42-spring, 43-first outer annular seat, 44-second outer annular seat;
51-first through hole, 52-annular groove;
71-an overflowing hole; 81-connecting disc, 82-second supporting plate.
Detailed Description
The following description of the present invention is provided for the purpose of illustration, and unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be construed broadly and may include, for example, a fixed connection or a detachable connection or an integral connection; either a direct connection or an indirect connection, and the like. The specific meaning of the above terms in the present technical solution can be understood by those of ordinary skill in the art according to specific situations.
In the present invention, unless otherwise specified, the terms of orientation such as "upper, lower, bottom, top" are generally defined with reference to the drawing plane of the corresponding drawing, "inner and outer" are defined with reference to the outline of the corresponding drawing, and "front and rear" are defined with reference to the gas flow direction.
The present invention is not limited to the following embodiments, and various specific technical features described in the following embodiments may be combined in any suitable manner without contradiction, as long as they do not depart from the idea of the present invention, and should be considered as the disclosure of the present invention.
Example 1
The embodiment discloses a large-diameter casing lowering device in a coal mine well, and as shown in fig. 1, the device 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.
Wherein, be provided with central through-hole 11 on the joint 1, joint 1 one end and outer tube 2 coaxial coupling, the other end is used for connecting the drilling rod, and is specific, all through threaded connection between joint 1 and outer tube 2, the drilling rod.
The outer wall of the joint 1 is provided with a sleeve supporting platform 12 for supporting the end of the sleeve, and the diameter of the outer contour of the sleeve supporting platform 12 is larger than the outer diameter of the sleeve. When the casing is fitted to the running device, the end of the casing is held against the casing support platform 12. Specifically, the sleeve support table 12 is composed of a plurality of first support plates 121 disposed around the circumferential direction of the joint, and in this embodiment, 4 first support plates 121 are shown, as shown in fig. 2.
One end of the outer tube 2 is open, an inner annular seat 21 is arranged 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 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 of 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 respectively push 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 hole 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 the proper expansion amount is reasonably selected according to the required size of the lowering casing. The radial expansion of the rubber core 5 ensures that the expansion rear side surface of the rubber core 5 can be extruded and supported on the inner wall surface of the sleeve to tightly hold the sleeve, and the rubber core is conveniently in threaded butt joint with the previous section of sleeve. Be provided with the second through-hole on the gland 6, the diameter of first through-hole 51 and second through-hole all matches with inner tube 3 external diameter, and rubber core 5 and gland 6 all overlap respectively and establish on inner tube 3, and rubber core 5 sets up between second outer annular seat 44 and gland 6.
One end of the inner tube 3 is closed, the other end of the inner tube 3 is open, the closed end of the inner tube 3 is fixedly connected with the outer tube 2, specifically, the closed end of the inner tube 3 is connected with the outer tube 2 through a fixing ring 7, the fixing ring 7 is a circular ring structure, the circular ring is provided with through-flow holes 71 for flowing of washing liquid, and the through-flow holes 71 are uniformly arranged along the circumference of the fixing ring 7 at intervals; the inner wall and the outer wall of the circular ring are both provided with threads, so that the fixing ring 7 is conveniently connected with the inner tube 3 and the outer tube 2. The gland 6 is fixedly connected with the pipe wall of the outer pipe 2, and is also in threaded connection.
As a preferred embodiment of this embodiment, a pressure relief hole 31 is provided in the tube wall near the closed end, as shown in FIG. 5. The plurality of pressure relief holes 31 are uniformly distributed along the circumferential direction of the inner tube 3, and are used for preventing the rubber core 5 from being compressed too much and being beyond the yield strength so as not to be restored. The principle is that after the flushing liquid pushes the piston cylinder 41 to move to a certain distance towards the right side shown in fig. 1, the pressure relief hole 31 is exposed outside the piston cylinder 41, the flushing liquid 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 the preferred embodiment of this embodiment, set up as the concave-convex nested structure at the contact surface of rubber core 5 and second outer annular seat 44, the contact surface of rubber core 5 and gland 6, promote the steadiness.
As the preferred embodiment of this embodiment, be provided with the support piece 8 that is used for right the sleeve pipe on the outer wall of the open end of inner tube 3 or outer tube 2 outer wall, the outside profile diameter of support piece 8 is slightly less than the sheathed tube internal diameter, and both profile clearances are 1 ~ 2mm, and support piece 8 is at least two to guarantee the centering of sheathed tube. In this embodiment, one of the outer walls of the open end of the inner tube 3 and the outer wall of the outer tube 2 are provided, respectively, as shown in fig. 1. It is 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 circles of the two have the same profile diameter.
As shown in fig. 8 to 10, the support member 8 of the present embodiment includes a connection plate 81 and a plurality of second support plates 82 provided on an outer wall of the connection plate 81, the second support plates 82 being provided in plurality around a circumferential direction of the connection plate 81; the connecting 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 supporting plate 82 is welded on the outer wall of the connecting disc 81. More preferably, the second support plate 82 of the present embodiment is a sector plate, 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 connection plate 81.
As a preferred embodiment of this embodiment, a pressure detection hole 13 penetrating the central through hole 11 is provided on the joint 1 for connecting a pressure gauge or a pressure gauge oil pipe. The function of the flushing device is to observe the fluid pressure in the central through hole in real time, and determine whether to stop continuous flushing liquid injection or not through fluctuation of the pressure value in the process of below the casing pipe.
Example 2
The embodiment discloses a method for lowering a large-diameter casing in a coal mine, which adopts the device for lowering the large-diameter casing in the coal mine described in embodiment 1, and the specific lowering method comprises the following steps:
Then operating the drilling machine to enable the drill rod to rotate and feed at a low speed, and driving the casing to rotate and advance at a low speed by the rubber core 5 until the lowered casing is in threaded butt joint with the previous casing;
continuing to operate the drilling machine to enable the lowering device to move forwards, and enabling the well-jointed casing to enter a drill hole under the jacking force of the casing supporting table 12;
the mud pump is decompressed, the piston cylinder 41 moves upwards under the counterforce of the spring 42, and the rubber core 5 restores to loosen the sleeve;
and 3, repeating the step 2 until the adding, connecting and releasing of the orifice casing or the hole protecting casing with the specified depth are completed.
Claims (10)
1. A large-diameter casing lowering device in a coal mine well 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);
a central through hole (11) is formed in the joint (1), 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; a sleeve supporting table (12) for supporting the end of the sleeve is arranged on the outer wall of the joint (1), and the diameter of the outer contour of the sleeve supporting table (12) is larger than the outer diameter of the sleeve;
one end of the outer pipe (2) is open, and the inner wall of the other end is provided with an inner annular seat (21); one end of the inner pipe (3) is closed, and the other end is open;
the piston assembly (4) comprises a piston cylinder (41) and a spring (42), and a first outer annular seat (43) and a second outer annular seat (44) are respectively arranged on the outer walls of 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 of the outer pipe (2); the spring (42) is sleeved on the piston cylinder (41), and two ends of the spring (42) respectively push against the inner annular seat (21) and the first outer annular seat (43);
the rubber core (5) and the gland (6) are 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 arranged on 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).
2. The coal mine downhole large-diameter casing running device according to claim 1, wherein the casing support table (12) is composed of a plurality of first support plates (121) arranged around a circumferential direction of the joint.
3. The device for lowering the large-diameter casing in the coal mine well according to claim 1, wherein a pressure relief hole (31) is formed in the wall of the pipe close to the closed end of the inner pipe (3).
4. The device for lowering the large-diameter casing in the coal mine well 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 both arranged in a concave-convex nesting structure.
5. The device for lowering the large-diameter casing in the coal mine well according to claim 1, wherein a pressure detection hole (13) which is communicated with the central through hole (11) is formed in the joint (1) and is used for connecting a pressure gauge or a pressure gauge oil pipe.
6. The device for lowering the large-diameter casing in the coal mine well 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 overflowing hole (71).
7. The device for lowering the large-diameter casing in the coal mine well according to claim 1, wherein support pieces (8) for righting the casing are arranged on the outer wall of the open end of the inner pipe (3) or the outer wall of the outer pipe (2), the number of the support pieces (8) is at least two, and the diameter of the outer contour of each support piece (8) is smaller than the inner diameter of the casing.
8. The device for lowering the large-diameter casing in the coal mine well according to claim 7, wherein the support member (8) comprises a connecting disc (81) and a second support plate (82) arranged on the outer wall of the connecting disc (81), and the second support plate (82) is arranged in plurality around the circumferential direction of the connecting disc (81).
9. A method for lowering a large-diameter casing in a coal mine well is characterized in that the device for lowering the large-diameter casing in the coal mine well according to any one of claims 1 to 7 is adopted, and the specific method comprises the following steps:
step 1, the method for lowering the first casing comprises the following steps: connecting a joint (1) of the underground coal mine large-diameter casing lowering device with a drill rod, inserting the underground coal mine large-diameter casing lowering device into a casing to be lowered, enabling the end part of the casing to be lowered to be supported on a casing supporting table (12), operating a drilling machine to drive the drill rod to move forwards so as to drive the underground coal mine large-diameter casing lowering device to move forwards, and enabling the casing to be lowered to enter a drill hole under the action of the pushing force of the casing supporting table (12);
step 2, the subsequent casing pipe joining and lowering method comprises the following steps: withdrawing the underground coal mine large-diameter casing lowering device, and inserting the underground coal mine large-diameter casing lowering device into the next casing 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 connector (1) to push the piston cylinder (41) to move, and the rubber core (5) is extruded to expand along the radial direction, is held tightly in the rubber core and stops injecting the flushing fluid after a casing pipe is placed; operating the drilling machine to enable the lowering casing to be in butt joint with the previous casing;
continuously operating the drilling machine to enable the large-diameter casing lowering device under the coal mine to move forwards, and enabling the well-connected casing to enter a drill hole under the jacking force of the casing supporting table (12);
the mud pump is decompressed, the piston cylinder (41) moves upwards under the counterforce of the spring (42), and the rubber core (5) recovers to loosen the sleeve;
and 3, repeating the step 2 until the adding, connecting and releasing of the orifice casing or the hole protecting casing with the specified depth are completed.
10. The method for lowering the large-diameter casing pipe under the coal mine well according to the claim 9, wherein a pressure gauge (9) is arranged at the joint (1), and whether to stop injecting the flushing liquid is determined according to the change of the pressure value on the pressure gauge (9), and the method comprises the following steps: when the reading of the pressure gauge (9) is obviously reduced, the flushing liquid enters the pressure relief hole (31), the piston cylinder (41) moves to the preset position, and the water injection is stopped at the moment.
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| 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 |
|---|---|---|---|
| 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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| CN114016920A true CN114016920A (en) | 2022-02-08 |
| CN114016920B CN114016920B (en) | 2024-04-09 |
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| CN202111282606.5A Active CN114016920B (en) | 2021-11-01 | 2021-11-01 | Underground coal mine large-diameter casing pipe lowering device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117722141A (en) * | 2024-02-07 | 2024-03-19 | 大庆市瑞斯德石油机械制造有限公司 | Airtight casing nipple with special threads |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4842081A (en) * | 1986-04-02 | 1989-06-27 | Societe Nationale Elf Aquitaine (Production) | Simultaneous drilling and casing device |
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Cited By (2)
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| CN117722141B (en) * | 2024-02-07 | 2024-04-26 | 大庆市瑞斯德石油机械制造有限公司 | Airtight casing nipple with special threads |
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| CN114016920B (en) | 2024-04-09 |
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