CN113090191B - Drilling fixed-point hole protecting method, device and construction process for complex zone of coal mine - Google Patents
Drilling fixed-point hole protecting method, device and construction process for complex zone of coal mine Download PDFInfo
- Publication number
- CN113090191B CN113090191B CN202110390836.7A CN202110390836A CN113090191B CN 113090191 B CN113090191 B CN 113090191B CN 202110390836 A CN202110390836 A CN 202110390836A CN 113090191 B CN113090191 B CN 113090191B
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- drilling
- main body
- protecting
- elastic
- steel pipe
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/04—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells operated by fluid means, e.g. actuated by explosion
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The invention belongs to the technical field of coal mine drilling equipment. The fixed point hole protecting device is arranged on a drilling tool and comprises an elastic protecting pipe with expandable diameter, a locking mechanism for enabling the diameter of the elastic protecting pipe to be in a contraction state and a steel pipe main body; the steel pipe main body is sleeved on the drilling tool, and the locking mechanism is connected with the elastic protection pipe; a hydraulic cavity is arranged between the steel pipe main body and the locking mechanism; the steel pipe main body is provided with a water inlet which is communicated with the hydraulic cavity; the locking mechanism is acted by high-pressure water in the drilling tool to release the elastic protective pipe, the diameter of the elastic protective pipe is increased, and support is provided for the wall of the drilling hole; the construction process adopts the fixed-point hole protecting device, and when the drill bit drills into a broken soft stratum, the elastic protecting pipe is released by high-pressure water to support and protect the hole wall. The invention supports the drill holes in the complex broken and soft fault zone through the elastic protective pipe, and solves the problem that the complex broken and soft fault zone is difficult to construct.
Description
Technical Field
The invention belongs to the technical field of coal mine drilling equipment, and relates to a method, a device and a construction process for drilling and fixing a hole in a complex zone of a coal mine.
Background
At present, coal bed gas treatment mainly adopts drilling extraction as a main technical means. Hole collapse and drill sticking can occur when the drilling construction is carried out to a broken zone, and the penetration difficulty is high, so that the construction cannot be continued; in order to solve the problem of high construction difficulty of a broken soft fault zone, some construction processes mainly comprise a casing drilling hole-protecting process and a fixed-point grouting reinforcement process, so as to solve the construction problem. However, the casing drilling process has high cost and great construction difficulty, and particularly has outstanding problems for deep hole zones; the fixed-point grouting reinforcement process is complex in implementation process and large in limitation, and the cost is high when the fixed-point grouting reinforcement process meets certain special stratums.
Disclosure of Invention
In view of the above, the invention aims to solve the problem that a complicated broken soft fault zone is easy to collapse, improve the drilling depth of a directional drilling machine in various stratums, and provide a method, a device and a construction process for drilling a fixed-point hole in a complicated zone of a coal mine.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for drilling and protecting hole at fixed point in complex area of coal mine, an elastic protecting tube with expandable diameter is arranged on a drilling tool, and a locking mechanism is arranged on the elastic protecting tube to make the diameter of the elastic protecting tube in a contracted state; and (3) sending the drilling tool into the designated hole protecting position, and opening the locking mechanism by using high-pressure water in the drilling tool to enable the elastic protecting pipe to be separated from the drilling tool, so that the diameter of the elastic protecting pipe after being separated is increased and the elastic protecting pipe is fastened on the wall of the drilling hole.
This basic scheme is through utilizing the water under high pressure in the drilling tool to open locking mechanism, releases the expandable elasticity pillar of diameter to the pilot hole position, and the elasticity pillar loses the restraint, and the diameter grow provides the support for the drilling wall to the elasticity pillar hole can supply the drilling tool to pass through.
Further, the elastic protective tube is a radial elastic structure or a volume expandable structure.
A drilling fixed-point hole protection and fixed-point hole protection device for a complex area of a coal mine comprises a steel pipe main body, a locking mechanism arranged on the steel pipe main body, and an elastic protection pipe sleeved on the steel pipe main body; the elastic protection pipe is axially provided with an opening; the opening is in a closed state under the constraint of the locking mechanism; a hydraulic cavity is arranged between the steel pipe main body and the locking mechanism; the steel pipe main body is provided with a water inlet which is communicated with the hydraulic cavity; the locking mechanism releases the elastic protective tube under the action of the pressure of the hydraulic cavity.
Install on the steel pipe main part through adopting locking mechanism will be provided with open-ended elasticity pillar to set up the hydraulic pressure chamber, utilize the water under high pressure when creeping into, open locking mechanism, release elasticity pillar, elasticity pillar is bounced off under the effect of self powerful elastic force, pastes the pore wall, thereby realizes the protection to the pore wall.
Further, the locking mechanism comprises a sliding sleeve and a limiting piece; the sliding sleeves are sleeved at two ends of the elastic protection pipe and fixedly connected with the steel pipe main body through the limiting pieces; the hydraulic pressure chamber is located on the sliding sleeve inner wall, still be equipped with a step terminal surface on the sliding sleeve inner wall, hydraulic pressure chamber pressure acts on the step terminal surface makes the sliding sleeve along steel pipe main part endwise slip, with elasticity pillar separation, beneficial effect: through sliding sleeve restraint elasticity pillar, make its opening be in the closure state, hydraulic pressure chamber pressure is used in on the step terminal surface for sliding sleeve axial atress separates with the elasticity pillar, and elasticity pillar opening bullet is opened, pastes in the pore wall, provides the support for the pore wall.
Furthermore, a sleeve hole is formed in the sliding sleeve close to the end of the elastic protection pipe, and the end face of the elastic protection pipe is located in the sleeve hole; trepanning lateral wall is equipped with the ball, elasticity pillar and ball sliding fit, beneficial effect: the trepanning retrains the elasticity pillar, makes its diameter be in less state, sets up the ball and is used for reducing the friction of elasticity pillar and trepanning wall.
Further, the limiting piece is a pin shaft; the sliding sleeve is fixedly connected with the steel pipe main body through a pin shaft; the sliding sleeve is driven by the pressure of the hydraulic cavity to break the pin shaft and is separated from the elastic protective tube.
Further, the limiting piece is a spring; the spring is sleeved on the steel pipe main body, one end of the spring is in contact with the end face of the sliding sleeve, and the other end of the spring is connected with the steel pipe main body; the sliding sleeve compresses the spring under the pressure action of the hydraulic cavity and is separated from the elastic protective tube.
Furthermore, joints are arranged at two ends of the steel pipe main body and detachably connected with the steel pipe main body; locking mechanism and articulate, beneficial effect: through the connector, a plurality of devices can be connected in series, so that the devices are matched with the width of the broken soft fault zone.
A drilling fixed-point hole-protecting construction process for a complex zone of a coal mine comprises the following steps:
s1, mounting a fixed-point hole protecting device: when the drilling construction reaches the broken soft fracture layer, withdrawing the drilling tool and the drill bit, and estimating the width of the broken soft fracture layer; the fixed point hole protecting device is connected to the back of the drill bit;
s2, fixed point hole protection construction: the fixed point hole protecting device is brought to the broken soft fault layer through the drilling tool, the drilling machine is started to continuously drill, after the drill bit penetrates through the broken soft fault layer, the drilling machine is stopped, water flow in the drilling tool is adjusted to be high pressure, the locking mechanism is opened by the high pressure water flow, the elastic protecting pipe is released, the opening of the elastic protecting pipe is opened, and the elastic protecting pipe is attached to the wall of the broken soft fault hole to form a hole protecting channel;
s3, unloading the fixed-point hole protection device: operating the drilling machine, withdrawing the drilling tool, removing the fixed point hole protecting device, and continuously feeding the drilling tool to carry out drilling construction;
s4, circulating construction: and when the broken soft fault is encountered again, repeating the steps from S1 to S3 until the drilling construction is finished.
Further, in step S1, a plurality of fixed point hole protection devices are connected in series through the interfaces, and the length of the series connection matches with the width of the broken soft breaking layer.
The invention has the beneficial effects that:
1) the invention utilizes high-pressure water during drilling to open the locking mechanism, simultaneously releases the elastic protective pipe, and adopts the elastic protective pipe to support and protect the hole wall.
2) The fixed-point hole protecting device can be connected in series according to actual conditions, and meets the requirements of different widths so as to better adapt to complicated and variable stratums.
3) The fixed point hole protecting device is simple and can be recycled; the fixed-point hole protection construction method is simple, the hole protection cost is low, and the drilling construction efficiency is improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For a better understanding of the objects, aspects and advantages of the present invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of a fixed point hole-protecting device in example 1 of the present invention;
FIG. 2 is a schematic view of a fixed point guard hole device in embodiment 2 of the present invention;
FIG. 3 is an enlarged view of A in FIGS. 1 and 2;
FIG. 4 is an enlarged view of B in FIGS. 1 and 2;
FIG. 5 is a schematic view of drilling in fixed point hole protection construction;
FIG. 6 is a schematic view of the position of a fixed point hole-protecting device in fixed point hole-protecting construction;
FIG. 7 is a schematic view of the elastic protection tube in a release expanded state;
FIG. 8 is a schematic view of an elastic casing in a borehole during point hole construction;
fig. 9 is a schematic diagram of cycle construction in fixed point hole protection construction.
Reference numerals are as follows: 1-a female connector; 2-a sliding sleeve; 21-step end face; 22-trepanning; 3 a-a pin shaft; 3 b-a spring; 4-a steel pipe body; 5-elastic protective tube; 6-male connector; 7-a water inlet; 8-a hydraulic chamber; 9-a drilling tool; 10-a drill bit; 11-conventional formation; 12-broken soft fault.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and embodiments may be combined with each other without conflict.
Wherein the showings are for the purpose of illustration only and not for the purpose of limiting the invention, shown in the drawings are schematic representations and not in the form of actual drawings; for a better explanation of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Example 1
Referring to fig. 1, 3 and 4, a drilling fixed-point hole protecting device for a complex area of a coal mine comprises a steel pipe main body 4, locking mechanisms and an elastic protecting pipe 5, wherein the two locking mechanisms are respectively installed at two ends of the elastic protecting pipe 5; the locking mechanism comprises a sliding sleeve 2 and a limiting piece, and the limiting piece adopts a pin shaft 3 a; the sliding sleeve 2 is fixedly connected with a joint through a pin shaft 3a, and the joint is connected with the steel pipe main body 4 through threads, so that the sliding sleeve 2 is fixedly sleeved at two ends of the elastic protection pipe 5; a hydraulic cavity 8 is arranged on the inner wall of the sliding sleeve 2; a water inlet 7 is formed in the steel pipe main body 4, and the water inlet 7 is communicated with a hydraulic cavity 8; the inner wall of the sliding sleeve 2 is provided with a step end face 21, and the pressure of the hydraulic cavity 8 acts on the step end face 21 to enable the sliding sleeve 2 to axially slide along the steel pipe main body 4 and separate from the elastic protective pipe 5; the end of the sliding sleeve 2 close to the elastic protection tube 5 is provided with a sleeve hole 22, and the end surface of the elastic protection tube 5 is positioned in the sleeve hole 22; the side wall of the trepanning 22 is also provided with a ball, and the elastic protective tube 5 is in sliding fit with the ball; the elastic protection tube 5 is axially provided with an opening, and the opening is in a closed state under the constraint of the trepan boring 22; when high-pressure water is filled in the hydraulic cavity 8, the hydraulic cavity 8 pushes the sliding sleeve 2, the pin shaft 3a is broken under the pressure action of the hydraulic cavity 8, the sliding sleeve 2 slides axially along the steel pipe main body 4, and the elastic protection pipe 5 is released.
In the embodiment, a male joint 6 and a female joint 1 are respectively arranged at two ends of a steel pipe main body 4, and the male joint 6 and the female joint 1 are connected with the steel pipe main body 4 through threads; the two sliding sleeves 2 are respectively arranged on the male joint 6 and the female joint 1 through pin shafts 3 a.
Referring to fig. 5 to 9, a construction process using the fixed-point hole-protecting device includes the following steps:
s1, installing a fixed-point hole protection device: when the drilling hole is constructed from the conventional stratum 11 to the broken soft fault 12, the drilling tool 9 and the drilling head 10 are withdrawn, and the width of the broken soft fault 12 is estimated; the fixed point hole protecting devices are connected to the back of the drill bit 10, a plurality of fixed point hole protecting devices are connected in series through the interfaces, and the length of the connected fixed point hole protecting devices is matched with the width of the soft breaking layer 12;
s2, fixed-point hole protection construction: the fixed point hole protecting device is brought to the broken soft fracture layer 12 through the drilling tool 9, the drilling machine is started to continuously drill, after the drilling bit 10 penetrates through the broken soft fracture layer 12, the drilling machine is stopped, water flow in the drilling tool 9 is adjusted to be high pressure, the locking mechanism is opened by the high-pressure water flow, the elastic protecting pipe 5 is released, the opening of the elastic protecting pipe 5 is opened, the elastic protecting pipe is attached to the wall of the broken soft fracture layer 12, and a hole protecting channel is formed;
s3, unloading the fixed-point hole protection device: operating the drilling machine, withdrawing the drilling tool 9, removing the fixed point hole protecting device, and continuously feeding the drilling tool 9 for drilling construction;
s4, circulating construction: when the broken soft fault 12 is encountered again, the steps from S1 to S3 are repeated until the drilling construction is finished.
Example 2
Referring to fig. 2, fig. 3 and fig. 4, the present embodiment is different from embodiment 1 in that: the limiting part adopts a spring 3 b; the spring 3b is sleeved on the steel pipe main body 4, one end of the spring 3b is contacted with the end face of the sliding sleeve 2, and the other end is connected with the steel pipe main body 4; the sliding sleeve 2 compresses the spring 3b under the pressure action of the hydraulic cavity 8, is separated from the elastic protective tube 5, releases the elastic protective tube 5, and opens the elastic protective tube 5 to stick to the hole wall of the broken soft fault 12 to form a hole-protecting channel.
The construction process in this example is the same as in example 1.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A drilling fixed-point hole-protecting construction process for a complex zone of a coal mine is characterized by comprising the following steps:
s1, mounting a fixed-point hole protecting device: when the drilling construction is carried out to the broken soft fracture layer, the drilling tool and the drill bit are withdrawn, and the width of the broken soft fracture layer is estimated; a plurality of fixed point hole protecting devices are connected behind the drill in series; the length of the fixed point hole protecting device after being connected in series is matched with the width of the broken soft breaking layer;
the fixed-point hole protecting device comprises a steel pipe main body, a locking mechanism arranged on the steel pipe main body and an elastic protecting pipe sleeved on the steel pipe main body; the elastic protection pipe is axially provided with an opening; the opening is in a closed state under the constraint of the locking mechanism; a hydraulic cavity is arranged between the steel pipe main body and the locking mechanism; the steel pipe main body is provided with a water inlet which is communicated with the hydraulic cavity; the locking mechanism releases the elastic protective tube under the action of the pressure of the hydraulic cavity;
the locking mechanism comprises a sliding sleeve and a limiting piece; the sliding sleeves are sleeved at two ends of the elastic protection pipe and fixedly connected with the steel pipe main body through the limiting pieces; the hydraulic cavity is arranged on the inner wall of the sliding sleeve, the inner wall of the sliding sleeve is also provided with a step end face, and the pressure of the hydraulic cavity acts on the step end face to enable the sliding sleeve to axially slide along the steel pipe main body and be separated from the elastic protective pipe;
s2, fixed-point hole protection construction: the fixed point hole protecting device is brought to the broken soft fault layer through the drilling tool, the drilling machine is started to continuously drill, after the drill bit penetrates through the broken soft fault layer, the drilling machine is stopped, water flow in the drilling tool is adjusted to be high pressure, the locking mechanism is opened by the high pressure water flow, the elastic protecting pipe is released, the opening of the elastic protecting pipe is opened, and the elastic protecting pipe is attached to the wall of the broken soft fault hole to form a hole protecting channel;
s3, unloading the fixed-point hole protection device: operating the drilling machine, withdrawing the drilling tool, removing the fixed point hole protecting device, and continuously feeding the drilling tool to perform drilling construction;
s4, circulating construction: and when the broken soft fault is encountered again, repeating the steps S1-S3 until the drilling construction is finished.
2. The coal mine complex zone drilling fixed-point hole-protecting construction process as claimed in claim 1, wherein: the end face of the elastic protection pipe is positioned in the sleeve hole; the side wall of the trepanning is provided with a ball, and the elastic protective tube is in sliding fit with the ball.
3. The coal mine complex zone drilling fixed-point hole-protecting construction process as claimed in claim 1, wherein: the limiting piece is a pin shaft; the sliding sleeve is fixedly connected with the steel pipe main body through a pin shaft; the sliding sleeve is driven by the pressure of the hydraulic cavity to break the pin shaft and is separated from the elastic protective tube.
4. The coal mine complex zone drilling fixed-point hole-protecting construction process according to claim 1, characterized in that: the limiting piece is a spring; the spring is sleeved on the steel pipe main body, one end of the spring is in contact with the end face of the sliding sleeve, and the other end of the spring is connected with the steel pipe main body; the sliding sleeve compresses the spring under the pressure action of the hydraulic cavity and is separated from the elastic protective tube.
5. The coal mine complex zone drilling fixed-point hole-protecting construction process as claimed in claim 1, wherein: joints are arranged at two ends of the steel pipe main body and detachably connected with the steel pipe main body; the locking mechanism is connected with the joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110390836.7A CN113090191B (en) | 2021-04-12 | 2021-04-12 | Drilling fixed-point hole protecting method, device and construction process for complex zone of coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110390836.7A CN113090191B (en) | 2021-04-12 | 2021-04-12 | Drilling fixed-point hole protecting method, device and construction process for complex zone of coal mine |
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| CN113090191A CN113090191A (en) | 2021-07-09 |
| CN113090191B true CN113090191B (en) | 2022-07-22 |
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| CN113090191A (en) | 2021-07-09 |
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