A borehole in-hole hanger and method of use

Abstract

The application discloses a drilling hole in-hole suspension device and a use method thereof. The drilling hole in-hole suspension device comprises a clamping pipe, one end of the clamping pipe is provided in a sealed manner and the end is provided with a ventilation hole, an open end of the clamping pipe is connected with a variable section piece, the variable section piece is connected with a pulling mechanism arranged in the clamping pipe, and a positioning mechanism is connected with the middle part of the clamping pipe. The use method comprises the following steps: S1, drilling is completed; S2, the drilling hole in-hole suspension device is assembled; S3, the drilling hole in-hole suspension device is sent into a drilling hole by using a drilling machine and a drill rod; S4, after the drilling hole in-hole suspension device is placed at a specified position in the drilling hole, the drill rod is withdrawn from the drilling hole, a flexible expansion sleeve is contracted to realize the fixing operation between the clamping pipe and the drilling hole; S5, the variable section piece is completely separated from the clamping pipe; and S6, a steel wire rope is connected with a hole sealing flexible through pipe, and the hole sealing flexible through pipe is pulled to a specified position in the drilling hole by pulling the steel wire rope.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas extraction, in particular to a drilling hole in-hole suspension device and a use method thereof. BACKGROUND

[0002] Through long-term development and improvement, the drilling hole sealing technology has formed a pressure sealing hole, a "through pipe direct connection" process, effectively realizing the sealing of the sealing section, basically eliminating the possible gas leakage points in the pipeline, and providing a strong condition for the development of drilling gas extraction and gas pressure measurement.

[0003] With the improvement of mine gas control concept and the rapid development of drilling equipment, the mine gas control mode has realized the transformation from local "four-in-one" to regional "four-in-one", and the deep drilling of part of the mine area with a rock hole depth greater than 50m has become the main component of the regional gas control measures of the mining face.

[0004] The increase of drilling depth, on the one hand, provides an effective means for the mine to achieve large-area one-time outburst control, and on the other hand, also puts forward higher requirements for drilling hole sealing. Patent No. CN114991703A discloses a mine water exploration drilling hole crack grouting sealing device, which uses a flexible pipe as a drilling hole sealing pipeline, and sends sealing liquid into the drilling hole through the flexible pipe to realize the sealing operation of the drilling hole. However, without auxiliary measures, the depth of the flexible pipe in the drilling hole is very limited, and the actual sealing position of the drilling hole cannot meet the design requirements of the deep drilling hole sealing, which directly affects the accuracy of the gas extraction effect and the gas pressure measurement result. SUMMARY

[0005] The present application aims to solve the above problems, and provides a drilling hole in-hole suspension device and a use method thereof, which are simple in structure and convenient to operate.

[0006] In order to achieve the above purpose, the technical scheme of the present application is:

[0007] A borehole suspension device includes a positioning pipe; the positioning pipe is a circular pipe, one end of which is sealed, and a plurality of vent holes are provided on one side wall of the sealed end of the positioning pipe. The other end of the positioning pipe is open, and a variable element is connected to the open end of the positioning pipe. The variable element is connected to a pulling mechanism disposed inside the positioning pipe. A positioning mechanism is connected in the middle of the positioning pipe, and the positioning mechanism is located between the pulling mechanism and the vent holes. The positioning mechanism includes a flexible expansion sleeve and a sliding ring; the flexible expansion sleeve and the sliding ring are both sleeved on the outer side of the middle part of the positioning pipe. The axial end of the flexible expansion sleeve near the sealed end of the positioning pipe is fixedly connected to the outer wall of the positioning pipe, and the axial end of the flexible expansion sleeve near the open end of the positioning pipe is fixedly connected to the sliding ring. The sliding ring is slidably connected to the positioning pipe and can slide along the axial direction of the positioning pipe.

[0008] Furthermore, the end of the variable joint away from the positioning pipe is provided with an installation groove and is threadedly connected to the drill rod end through the installation groove. The end of the variable joint near the positioning pipe is sleeved inside the open end of the positioning pipe and is keyed to the side wall of the positioning pipe. The inner side of the end of the variable joint near the positioning pipe is a hollow structure, and a first connecting member is provided inside the hollow structure and is connected to the pulling mechanism through the first connecting member.

[0009] Furthermore, the first connecting member is a first bolt, and the end of the variable member near the positioning pipe is provided with a first through bolt hole and is threadedly connected to the first bolt through the first through bolt hole; a keyway is provided on one side of the open end of the positioning pipe, the length direction of the keyway is consistent with the axial direction of the positioning pipe, and one end of the keyway penetrates the end wall of the open end of the positioning pipe; when the variable member is connected to the positioning pipe, the end of the variable member near the positioning pipe is inserted into the inside of the open end of the positioning pipe and the variable member can slide relative to the positioning pipe, while one end of the first bolt is located in the keyway, and the first bolt is connected to the pulling mechanism.

[0010] Furthermore, the pulling mechanism includes a steel wire rope and a second connector. The second connector is fixed inside the positioning pipe and is located between the keyway and the positioning mechanism. A rope-threading groove is provided on the side wall of the positioning pipe and is located on one side of the second connector. One end of the steel wire rope is connected to the first connector, and the other end of the steel wire rope passes around the second connector and exits through the rope-threading groove outside the positioning pipe.

[0011] Furthermore, the second connector is a second bolt, and a second through bolt hole is provided on the side wall of the locking pipe, and the second bolt is threadedly connected through the second through bolt hole. The axial direction of the second bolt is consistent with the axial direction of the first bolt, and the axial directions of both the first bolt and the second bolt are perpendicular to the axial direction of the locking pipe. The line connecting the rope groove and the axis of the locking pipe is perpendicular to the line connecting the keyway and the axis of the locking pipe.

[0012] Furthermore, the positioning mechanism also includes a third connecting member, which is fixedly connected to the side wall of the positioning pipe and to the end of the flexible expansion sleeve away from the sliding ring.

[0013] Furthermore, the third connector is a third bolt, and a third through bolt hole is provided on the side wall of the locking pipe and is threadedly connected to the third bolt through the third through bolt hole; the end of the flexible expansion sleeve away from the sliding ring is sleeved on the outer side of both ends of the third bolt and the flexible expansion sleeve is fixedly connected to the third bolt.

[0014] Furthermore, the outer wall of the sliding ring is narrowed in the middle, and the flexible expansion sleeve is sleeved on the outside of the sliding ring at one end, and the flexible expansion sleeve at one end is fixedly connected to the sliding ring at the other end.

[0015] Furthermore, the sealing end of the positioning pipe is cone-shaped.

[0016] A method for using a borehole suspension device includes the following steps:

[0017] S1. After drilling is completed, remove all drill rods from the borehole in sequence and unload the drill bit.

[0018] S2. Thread one end of the variable joint to one end of the drill rod, fix one end of the wire rope to the first bolt, and pass the other end of the wire rope through the rope groove and out of the locking pipe after passing around the second bolt; then connect the locking pipe to the end of the variable joint near the locking pipe, so that the end of the first bolt is embedded in the keyway.

[0019] S3. Use the drilling rig to slowly send the drill rod, the variable joint and the locking pipe into the borehole, while gradually extending the steel wire rope so that it extends in the borehole in sync with the locking pipe.

[0020] S4. After the positioning pipe is placed in the designated position in the borehole, tighten the steel wire rope outside the borehole, and at the same time slowly withdraw the drill rod and the variable joint from the borehole. The positioning pipe moves synchronously with the variable joint. The flexible expansion sleeve located on the outside of the positioning pipe generates friction with the inner wall of the borehole and gradually contracts. The slider slides towards the sealing end of the positioning pipe and makes the contracted flexible expansion sleeve finally stop at the position of the third bolt. At this time, the flexible expansion sleeve is fully contracted and makes full contact with the inner wall of the borehole, realizing the positioning and support operation between the positioning pipe and the inner wall of the borehole. At the same time, under the action of friction between the flexible expansion sleeve and the inner wall of the borehole, the positioning pipe is fixed in the borehole and forms a suspended state.

[0021] S5. Continue to slowly withdraw the drill rod and the variable joint from the borehole, while gradually extending the wire rope to completely separate the variable joint from the clamping pipe. Slowly withdraw all the drill rods from the borehole in sequence. At this time, the wire rope forms a pulley steering structure in the clamping pipe.

[0022] S6. Disconnect the wire rope from the first bolt and reconnect the end of the wire rope connected to the first bolt to one end of the sealing flexible tube. Then pull the other end of the wire rope to pull the sealing flexible tube to the designated position in the borehole, thus completing the lowering operation of the sealing flexible tube in the borehole.

[0023] Compared with the prior art, the advantages and positive effects of this invention are:

[0024] This invention proposes a borehole suspension device. This device is simple and reliable in structure. It allows the positioning pipe to be lowered to any designated position within the borehole using a drilling rig and drill rod, and its positioning is achieved through a positioning mechanism. Then, a traction mechanism lowers the flexible sealing pipe to the designated position within the borehole. This solves the problem of difficulty in lowering the flexible sealing pipe in medium-length boreholes in pressurized sealing and "direct pipe connection" processes. It improves the lowering depth and accuracy of the flexible sealing pipe in medium-length boreholes, fully meeting the sealing requirements of medium-length boreholes and ensuring that the sealing effect is not affected. This improves the gas extraction efficiency and the accuracy of gas pressure measurement results in coal mining operations, bringing convenience to coal mine gas extraction work. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 Connection structure between variable fitting and clamping pipe Figure One ;

[0027] Figure 2 Connection structure between variable fitting and clamping pipe Figure Two ;

[0028] Figure 3 The structure is a separate structure for the variable fitting and the locking pipe. Figure One ;

[0029] Figure 4 Separate structure for variable fitting and locking pipe Figure Two . Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art to all other embodiments obtained without creative effort should be included within the protection scope of the present invention.

[0031] like Figures 1 to 4 As shown, this embodiment discloses a borehole suspension device, including a locking pipe 1, a flexible expansion sleeve 9, a variable element 13, and a steel wire rope 16; the locking pipe 1 is a rigid hollow cylinder, with its inner end being a closed conical shape or a reduced-diameter platform, and its outer end being an open shape.

[0032] The positioning pipe 1 is provided with a vent hole 2, a third through bolt hole 3, a second through bolt hole 5, a rope groove 7, and a keyway 8 sequentially from the inner end to the outer end. The vent holes 2 are evenly distributed on a section of the side wall of the positioning pipe 1 near the inner end, and all penetrate the side wall of the positioning pipe 1. The design of the vent holes facilitates subsequent gas pressure measurement. The third through bolt hole 3 is located near the 1 / 3 position of the positioning pipe 1 near the inner end, perpendicularly penetrates the side wall of the positioning pipe 1, and is threadedly connected to the third bolt 4. The second through bolt hole 5 is located near the outer end of the locking pipe 1 at about 1 / 3 of its length, perpendicularly penetrating the side wall of the locking pipe 1, and is threadedly connected to the second bolt 6; the rope groove 7 is located on the side wall of the locking pipe 1 and is located on one side of the second bolt 6, and is arranged perpendicularly to the second through bolt hole 5 in space; the keyway 8 is located at the outer end of the locking pipe 1 and is arranged parallel to the rope groove 7, and the line connecting the centerline of the rope groove 7 and the axis of the locking pipe 1 forms a 90° angle with the line connecting the centerline of the keyway 8 and the axis of the locking pipe 1;

[0033] The flexible expansion sleeve 9 is sleeved in the middle of the positioning pipe 1. The inner end of the flexible expansion sleeve 9 (i.e. the side near the sealed end of the positioning pipe 1) is fixed to the third bolt 4 by the upper fixing wire 10, and the outer end (i.e. the side near the open end of the positioning pipe 1) is fixed to the sliding ring 12 by the lower fixing wire 11.

[0034] The sliding ring 12 is a hollow circular tube, which is sleeved on the outside of the locking pipe 1 and can slide along the locking pipe 1. The cross-section of the sliding ring 12 is concave.

[0035] The cross-section of the variable member 13 is a horizontally convex shape. Its outer end is threaded and connected to the drill rod, and its inner end is a hollow cylinder. The inner end of the variable member 13 is provided with a first through screw hole 14, which is threaded to the first bolt 15.

[0036] The variable element 13 can be embedded inside the locking pipe 1, and one end of the first bolt 15 can be inserted into the keyway 8; when the drilling rig drives the drill rod to rotate and advance, the variable element 13 can drive the locking pipe 1 to rotate and advance in the borehole through the keyway 8.

[0037] One end of the steel wire rope 16 is fixed to the first bolt 15, and the other end passes through the second bolt 6 inside the locking pipe 1 and exits through the rope groove 7 to the outside of the locking pipe 1.

[0038] This embodiment also discloses a method for using an in-hole suspension device, including the following steps:

[0039] S1. After drilling is completed, remove all drill rods from the borehole in sequence and unload the drill bit.

[0040] S2. Assemble the suspension device inside the borehole, connect the variable member 13 to the drill rod, fix one end of the steel wire rope 16 to the first bolt 15, and pass the other end through the second bolt 6 inside the locking pipe 1 and out of the locking pipe 1 through the rope groove 7; then, put the locking pipe 1 on the outside of the variable member 13, at which time the first bolt 15 is embedded in the keyway 8.

[0041] S3. Use the drill rod of the drilling rig to slowly send the suspension device inside the borehole into the borehole, while gradually extending the steel wire rope 16 so that it extends in the borehole in sync with the suspension device inside the borehole.

[0042] S4. After the suspension device inside the borehole is lowered to the designated position (e.g., ... Figure 1 , Figure 2 As shown), tighten the steel wire rope 16 outside the hole and slowly withdraw the drill rod. The variable element 13 moves outward with the drill rod, causing the locking pipe 1 to move backward synchronously. Meanwhile, the flexible expansion sleeve 9 gradually contracts due to friction with the borehole wall. The sliding ring 12 slides towards the sealing end of the locking pipe 1 and finally stops near the third through bolt hole 3. At this time, the flexible expansion sleeve 9 is fully contracted and fully contacts the borehole wall, so that the locking pipe 1 is fixed in the borehole and forms a suspended fixed state.

[0043] S5. Continue to slowly withdraw the drill pipe while gradually extending the wire rope 16. The variable joint 13 separates from the locking pipe 1, and drives the wire rope 16 to pass around the second through bolt hole 5 and gradually retreat. Withdraw all drill pipes from the borehole in sequence. At this time, the wire rope 16 forms a pulley structure inside the locking pipe 1 (e.g., Figure 3 , Figure 4 (as shown)

[0044] S6. Disconnect the end of the wire rope 16 from the variable member 13, and reconnect the end to one end of the sealing flexible pipe. Then pull the other end of the wire rope 16 to lower the sealing flexible pipe to the designated position, completing the lowering operation of the sealing flexible pipe into the medium-length borehole.

[0045] This invention proposes a borehole suspension device. This device is simple and reliable in structure. It allows the positioning pipe to be lowered to any designated position within the borehole using a drilling rig and drill rod, and its positioning is achieved through a positioning mechanism. Then, a traction mechanism lowers the flexible sealing pipe to the designated position within the borehole. This solves the problem of difficulty in lowering the flexible sealing pipe in medium-length boreholes in pressurized sealing and "direct pipe connection" processes. It improves the lowering depth and accuracy of the flexible sealing pipe in medium-length boreholes, fully meeting the sealing requirements of medium-length boreholes and ensuring that the sealing effect is not affected. This improves the gas extraction efficiency and the accuracy of gas pressure measurement results in coal mining operations, bringing convenience to coal mine gas extraction work.

Claims

1. A borehole suspension device, comprising a locking pipe, wherein the locking pipe is provided with a vent hole; characterized in that: The positioning pipe is a circular pipe with one end sealed. Several vent holes are provided on one side wall of the sealed end of the positioning pipe. The other end of the positioning pipe is open, and a variable element is connected to the open end. The variable element is connected to a pulling mechanism located inside the positioning pipe. A positioning mechanism is connected in the middle of the positioning pipe, located between the pulling mechanism and the vent holes. The positioning mechanism includes a flexible expansion sleeve and a sliding ring. Both the flexible expansion sleeve and the sliding ring are sleeved on the outer side of the middle part of the positioning pipe. One axial end of the flexible expansion sleeve is fixedly connected to the outer wall of the positioning pipe, and the other axial end of the flexible expansion sleeve is fixedly connected to the sliding ring. The sliding ring is slidably connected to the positioning pipe and can slide along the axial direction of the positioning pipe. The variable element is provided with an installation groove at the end away from the positioning pipe and is threaded to the drill rod end through the installation groove. The end of the variable element close to the positioning pipe is sleeved inside the open end of the positioning pipe and is keyed to the side wall of the positioning pipe. The inner side of the end of the variable element close to the positioning pipe is a hollow structure. A first connecting member is provided inside the hollow structure and is connected to the pulling mechanism through the first connecting member. The first connecting member is a first bolt. The end of the variable member near the positioning pipe is provided with a first through bolt hole and is threadedly connected to the first bolt through the first through bolt hole. A keyway is provided on one side of the open end of the positioning pipe. The length direction of the keyway is consistent with the axial direction of the positioning pipe, and one end of the keyway penetrates the end wall of the open end of the positioning pipe. When the variable member is connected to the positioning pipe, the end of the variable member near the positioning pipe is inserted into the inside of the open end of the positioning pipe, and the variable member can slide relative to the positioning pipe. At the same time, one end of the first bolt is located in the keyway, and the first bolt is connected to the pulling mechanism. The pulling mechanism includes a steel wire rope and a second connector. The second connector is fixed inside the positioning pipe and is located between the keyway and the positioning mechanism. A rope-threading groove is provided on the side wall of the positioning pipe and is located on one side of the second connector. One end of the steel wire rope is connected to the first connector, and the other end of the steel wire rope passes around the second connector and exits from the outside of the positioning pipe through the rope-threading groove. The second connector is a second bolt. A second through bolt hole is provided on the side wall of the locking pipe, and the second bolt is threadedly connected to the second bolt through the second through bolt hole. The axial direction of the second bolt is consistent with the axial direction of the first bolt, and the axial directions of both the first bolt and the second bolt are perpendicular to the axial direction of the locking pipe. The line connecting the rope groove and the axis of the locking pipe is perpendicular to the line connecting the keyway and the axis of the locking pipe. The positioning mechanism also includes a third connector, which is fixedly connected to the side wall of the positioning pipe and to the end of the flexible expansion sleeve away from the sliding ring.

2. The borehole suspension device as described in claim 1, characterized in that: The third connector is a third bolt. A third through bolt hole is provided on the side wall of the locking pipe and is threadedly connected to the third bolt through the third through bolt hole. The end of the flexible expansion sleeve away from the sliding ring is sleeved on the outer side of both ends of the third bolt and the flexible expansion sleeve is fixedly connected to the third bolt.

3. The borehole suspension device as described in claim 2, characterized in that: The outer wall of the sliding ring is narrowed in the middle. The flexible expansion sleeve is fitted on the outside of the sliding ring at one end and is fixedly connected to the sliding ring at the other end.

4. The borehole suspension device as described in claim 3, characterized in that: The sealing end of the positioning pipe is cone-shaped.

5. A method of using the borehole suspension device as described in claim 4, characterized in that: Includes the following steps: S1. After drilling is completed, remove all drill rods from the borehole in sequence and unload the drill bit. S2. Thread one end of the variable joint to one end of the drill rod, fix one end of the wire rope to the first bolt, and pass the other end of the wire rope through the rope groove and out of the locking pipe after passing around the second bolt; then connect the locking pipe to the end of the variable joint near the locking pipe, so that the end of the first bolt is embedded in the keyway. S3. Use the drilling rig to slowly send the drill rod, the variable joint and the locking pipe into the borehole, while gradually extending the steel wire rope so that it extends in the borehole in sync with the locking pipe. S4. After the positioning pipe is placed in the designated position in the borehole, tighten the steel wire rope outside the borehole, and at the same time slowly withdraw the drill rod and the variable joint from the borehole. The positioning pipe moves synchronously with the variable joint. The flexible expansion sleeve located on the outside of the positioning pipe generates friction with the inner wall of the borehole and gradually contracts. The sliding ring slides towards the sealing end of the positioning pipe and makes the contracted flexible expansion sleeve finally stop at the position of the third bolt. At this time, the flexible expansion sleeve is fully contracted and makes full contact with the inner wall of the borehole, realizing the positioning and support operation between the positioning pipe and the inner wall of the borehole. At the same time, under the action of friction between the flexible expansion sleeve and the inner wall of the borehole, the positioning pipe is fixed in the borehole and forms a suspended state. S5. Continue to slowly withdraw the drill rod and the variable joint from the borehole, while gradually extending the wire rope to completely separate the variable joint from the clamping pipe. Slowly withdraw all the drill rods from the borehole in sequence. At this time, the wire rope forms a pulley steering structure in the clamping pipe. S6. Disconnect the wire rope from the first bolt and reconnect the end of the wire rope connected to the first bolt to one end of the sealing flexible tube. Then pull the other end of the wire rope to pull the sealing flexible tube to the designated position in the borehole, thus completing the lowering operation of the sealing flexible tube in the borehole.

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