CN112855068B - Drill rod type hole packer - Google Patents
Drill rod type hole packer Download PDFInfo
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- CN112855068B CN112855068B CN202110068733.9A CN202110068733A CN112855068B CN 112855068 B CN112855068 B CN 112855068B CN 202110068733 A CN202110068733 A CN 202110068733A CN 112855068 B CN112855068 B CN 112855068B
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- pipe
- hole sealing
- valve
- hole
- connecting pipe
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices, or the like for cementing casings into 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
Abstract
The invention relates to a drill rod type hole packer, and belongs to the field of coal mine hole sealing and gas drainage. The hole packer comprises a filter pipe, a connecting pipe, a switching pipe and a water braid which are sequentially connected in a front-back mode, and inner cavities of the filter pipe, the connecting pipe, the switching pipe and the water braid form an inner channel. The on-off node of the internal channel is controlled through the mutual matching of the first regulating valve arranged in the front end port of the connecting pipe and the second regulating valve arranged in the rear end port of the switching pipe. In the hole sealing stage, an internal channel from the water braid to the front port section of the connecting pipe is used as a liquid flow channel for injecting and overflowing hole sealing liquid; and in the gas drainage stage, the water braid is removed, and an internal channel from the filter pipe to the rear end port section of the adapter pipe is used as an airflow channel for gas drainage. The internal channel can be used for hole sealing liquid injection, hole sealing liquid overflow and gas drainage in sequence, and three-in-one on the medium channel is realized, so that the overall structure of the hole sealer is more simplified. In addition, hole sealing liquid and a solid foaming agent are utilized to realize solid-liquid mixed hole sealing, and the traditional liquid sealing single mode is changed.
Description
Technical Field
The invention belongs to the field of coal mine hole sealing and gas drainage, and relates to a drill rod type hole sealing device.
Background
In the gas treatment process, for coal holes for gas drainage, hole sealing needs to be carried out after drilling is finished, and then gas extraction is carried out. The existing hole sealing device adopts a two-plugging one-injecting mode to complete hole sealing, namely, two ends of the hole are plugged in a coal hole with a certain length, and a hole sealing agent is injected in the middle of the hole sealing device to complete hole sealing, so that the following defects exist: (1) three independent channels are required to be arranged and are respectively used for hole sealing agent injection, overflow and gas drainage, so that the structure of the hole sealing device is complicated; (2) in order to meet the flowing and injecting requirements of the sealant, the sealant needs to adopt a liquid sealant; (3) the hole packer is short as a whole and is inconvenient to add and connect; (4) the hole sealing procedure is complex, can not use mechanized device to accomplish automatically, and intensity of labour is big.
Disclosure of Invention
In view of the above, the present invention provides a drill rod type hole packer to solve the problems that the structure is complex due to the separation of multiple channels of the existing hole packer, and the type of the hole packer is single due to the use of only a liquid hole packer.
In order to achieve the purpose, the invention provides the following technical scheme:
the drill rod type hole packer comprises a filter pipe, a connecting pipe, a switching pipe and a water braid which are sequentially connected in front and back, wherein inner cavities of the filter pipe, the connecting pipe, the switching pipe and the water braid form an internal channel; the front end of the filter pipe is closed, and a plurality of small holes communicated with the inner cavity of the filter pipe are distributed on the filter pipe; a first adjusting valve for controlling the on-off of the connecting pipe is arranged in the front port of the connecting pipe, a second adjusting valve for controlling the on-off of the connecting pipe is arranged in the rear port of the adapter pipe, the connecting pipe and the adapter pipe are respectively packaged with a solid foaming agent through a foaming agent sleeve sleeved on the connecting pipe and the adapter pipe, and an opening communicated with the inner cavity of the connecting pipe and the adapter pipe is arranged corresponding to the solid foaming agent; a gas discharge port is formed in a section from the second regulating valve to the adjacent solid foaming agent on the adapter tube; the water braid is provided with a liquid injection port, and the front end of the water braid props against the second regulating valve;
during hole sealing, hole sealing liquid is injected into the internal channel through the water braid, the second regulating valve is opened under the action of the water braid, the first regulating valve is closed when the pressure of the hole sealing liquid in the internal channel reaches a closing set value, the foaming agent sleeve is broken under the continuously increased pressure of the hole sealing liquid, the hole sealing liquid is mixed with the solid foaming agent, the solid foaming agent expands to fill the space between the outer wall of the hole sealing device and the inner wall of the coal hole, and hole sealing is completed; when gas is pumped and discharged, the water braid is removed, gas is pumped into the internal channel through the small holes distributed on the filter pipe, the flow direction of the gas is opposite to that of hole sealing liquid, the second regulating valve is closed after losing the effect of the water braid, and the first regulating valve is in an open state.
Further, the first regulating valve comprises a first valve body provided with a first medium channel and a first valve core movably arranged in the first valve body, and two ends of the first valve core are respectively provided with a first elastic piece; in an initial state, the first valve core is not in contact with the first medium channel so that the first medium channel is in an open state; when hole sealing is carried out, the first valve core moves along the flow direction of the hole sealing liquid under the pressure of the hole sealing liquid and contacts with the first medium channel to close the first medium channel; when gas is pumped and discharged, the first valve core is not contacted with the first medium channel so that the first medium channel is in an open state again.
Furthermore, the first valve core is provided with a first valve rod and a first boss arranged on the first valve rod, and a first retaining shoulder is arranged in the first valve body; the first boss is provided with a first outer conical surface, one side of the first retaining shoulder facing the first boss is provided with a first inner conical surface, and the first outer conical surface and the first inner conical surface can be mutually attached to block the first medium channel.
Furthermore, one end of the first valve core close to the filter pipe is connected with a first fixed seat which is integrally constructed with the first valve body, and the other end of the first valve core is connected with a first sliding seat which is slidably arranged in the first valve body; the first sliding seat is provided with a first through hole communicated with the first medium channel.
Furthermore, the second regulating valve comprises a second valve body provided with a second medium channel and a second valve core movably arranged in the second valve body, one end of the second valve core, which is close to the water swivel, is abutted against the water swivel, and the other end of the second valve core is provided with a second elastic piece; when hole sealing is carried out, the second valve core moves along the direction of hole sealing liquid under the action of the water braid and is not contacted with the second medium channel so as to be opened; when the gas is pumped and discharged, the second valve core loses the water braid effect and moves along the gas flow direction under the effect of the second elastic element, and the second valve core is contacted with the second medium channel so as to be closed.
Furthermore, the second valve core is provided with a second valve rod and a second boss arranged on the second valve rod, and a second retaining shoulder is arranged in the second valve body; the second boss is provided with a second outer conical surface, one side of the second retaining shoulder facing the second boss is provided with a second inner conical surface, and the second outer conical surface and the second inner conical surface can be mutually attached to block the second medium channel.
Furthermore, one end of the second valve core, which is close to the water braid, is connected with a second sliding seat which is slidably arranged in the second valve body, and the other end of the second valve core is connected with a second fixed seat which is fixedly arranged in the second valve body; the second sliding seat and the second fixed seat are provided with second through holes communicated with the second medium channel.
Furthermore, more than one connecting pipe is arranged; when more than two connecting pipes are arranged, a limiting plate is arranged in the rear port of each connecting pipe, and the limiting plate butts against the first regulating valve in the front port of the adjacent connecting pipe so as to enable the first regulating valve to be in an opening state in an initial state; the limiting plate is provided with a through hole communicated with the inner cavity of the connecting pipe.
Further, a hole sealing liquid flow through groove is formed in the front end of the water braid; the liquid injection ports on the water braid are more than two.
Further, the external diameter size of filter tube, connecting pipe, switching pipe and water pigtail matches with the external diameter size of drilling rod, and can be connected with the rig.
The invention has the beneficial effects that:
(1) the invention discloses a drill rod type hole packer, wherein inner cavities of a filter pipe, a connecting pipe, an adapter pipe and a water braid which are sequentially connected form an internal channel, and on-off nodes of the internal channel are controlled by mutual matching of a first regulating valve arranged in the front port of the connecting pipe and a second regulating valve arranged in the rear port of the adapter pipe. In the hole sealing stage, an internal channel from the water braid to the front port section of the connecting pipe is used as a liquid flow channel for injecting and overflowing hole sealing liquid; and in the gas drainage stage, the water braid is removed, and an internal channel from the filter pipe to the rear end port section of the adapter pipe is used as an airflow channel for gas drainage. The internal channel can be used for hole sealing liquid injection, hole sealing liquid overflow and gas drainage in sequence, and the trinity on the medium channel is realized, so that the overall structure of the hole sealer is simplified.
(2) The drill rod type hole sealing device disclosed by the invention utilizes the hole sealing liquid and the solid foaming agent to realize solid-liquid mixed hole sealing, and changes the traditional liquid sealing single mode.
(3) The drill rod type hole packer disclosed by the invention can flexibly select the number of the connecting pipes, and the actual requirement on the hole sealing length is met by lengthening the connecting pipes.
(4) According to the drill rod type hole packer disclosed by the invention, the outer diameter of the hole packer is matched with that of a drill rod, and the connection mode of the hole packer is also matched with a drilling machine and can be connected with the drilling machine. Drilling and hole sealing operations can be continuously carried out only by once positioning of drilling machine equipment, machine moving is not needed in the process, and the alignment precision is high; automatic hole sealing is realized, the hole sealing procedure is simplified, and the hole sealing efficiency and the hole sealing precision are 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 the purposes of promoting a better understanding of the objects, aspects and advantages of the 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 structural diagram of a drill pipe type hole packer of the present invention;
FIG. 2 is a schematic structural diagram of a connecting tube;
FIG. 3 is a schematic view of a first regulator valve;
FIG. 4 is a schematic structural view of the adapter tube;
FIG. 5 is a schematic view of a second regulator valve;
FIG. 6 is a schematic view of a water swivel.
Reference numerals: a filter tube 1, a small hole 11, a connecting tube 2, a first regulating valve 21, a first valve body 211, a first retaining shoulder 2111, a first inner conical surface 2112, a first elastic element 212, a first valve core 213, a first valve rod 2131, a first boss 2132, a first outer conical surface 2133, a first fixed seat 214, a first sliding seat 215, a first medium channel 216, a first through hole 217, a foaming agent sleeve I22, a solid foaming agent I23, an opening I24, a limiting plate 25 and an adapter tube 3, the opening II31, the foaming agent sleeve II32, the solid foaming agent II33, the quick-change connector 34, the second regulating valve 35, the second valve body 351, the second stop shoulder 3511, the second inner conical surface 3512, the second elastic element 352, the second valve core 353, the second valve rod 3531, the second boss 3532, the second outer conical surface 3533, the second fixed seat 354, the second sliding seat 355, the second medium channel 356, the second through hole 357, the water braid 4, the sealed liquid flowing through groove 41 and the injecting pipeline 42.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. 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 examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate 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.
Referring to fig. 1, a drill pipe type hole packer includes a filter pipe 1, a connecting pipe 2, an adapter pipe 3 and a water braid 4 connected in sequence, and their respective inner cavities form an internal channel. And at the mutual connection position, the connection is realized by adopting a matching mode of internal and external threads.
Specifically, the front end of the filter pipe 1 is closed, a plurality of circles of small holes 11 communicated with the inner cavity of the filter pipe 1 are circumferentially distributed on the pipe wall of the filter pipe 1, and the small holes 11 are used for the circulation of hole sealing liquid when an inner channel at the connecting pipe 2 in the hole sealing stage is not closed and the suction of gas to the inner channel in the gas drainage stage. The rear end of the filter pipe 1 is provided with an internal thread therein to be connected to the connection pipe 2.
As shown in fig. 2, a first regulating valve 21 for controlling the on-off of the connecting pipe 2 is arranged in the front port of the connecting pipe; a plurality of foaming agent sleeves I22 are bonded on the outer wall of the connecting pipe 2 at intervals, annular grooves are formed in the outer wall of the connecting pipe 2 corresponding to the foaming agent sleeve I22, the annular grooves and the foaming agent sleeve I22 form an annular space, and solid foaming agent I23 is packaged in the annular space; the groove bottom of the annular groove is provided with an opening I24 communicated with the inner cavity of the connecting pipe 2. Under normal conditions, the foaming agent sleeve I22 and the solid foaming agent I23 block the opening I24, so that the inner cavity of the connecting pipe 2 is completely sealed in the radial direction. The front end of the connecting pipe 2 is provided with an external thread, and the rear end opening is internally provided with an internal thread.
The number of the connecting pipes 2 is flexibly selected according to the actual requirement of the hole sealing length, only one connecting pipe 2 can be used and directly connected with the filter pipe 1 and the adapter pipe 3, and more than two connecting pipes 2 can also be connected in sequence to lengthen the whole hole sealing device and meet the requirement of the hole sealing length. When more than two connecting pipes 2 are arranged, a limiting plate 25 is arranged in the rear port of each connecting pipe 2, and the limiting plate 25 props against the first regulating valve 21 in the front port of the adjacent connecting pipe 2 so as to enable the first regulating valve to be in an open state in an initial state; the limiting plate 25 is provided with a through hole communicated with the inner cavity of the connecting pipe 2 so as to facilitate the circulation of hole sealing liquid and gas.
As shown in fig. 3, the first regulator valve 21 includes a first valve body 211 provided with a first medium passage 216, and a first spool 213 movably provided in the first valve body 211; the first valve element 213 comprises a first valve rod 2131 and a first boss 2132 arranged on the first valve rod 2131, and a first retaining shoulder 2111 is arranged in the first valve body 211; the first boss 2132 is provided with a first outer conical surface 2133, one side of the first retaining shoulder 2111 facing the first boss 2132 is provided with a first inner conical surface 2112, and the first outer conical surface 2133 and the first inner conical surface 2112 can be attached to each other to block the first medium channel 216. One end of the first valve stem 2131 of the first valve core 213 close to the filter pipe 1 is connected to a first fixed seat 214 integrally constructed with the first valve body 211, and the other end is connected to a first sliding seat 215 slidably installed in the first valve body 211; the first sliding seat 215 is provided with a first through hole 217 communicating with the first medium channel 216. Two ends of the first valve rod 2131 are further respectively provided with a first elastic element 212, in this embodiment, the first elastic element 212 is a spring; in the initial state, the first outer tapered surface 2133 is not in contact with the first inner tapered surface 2112 such that the first media passageway 216 is in an open state; during hole sealing, the first valve core 213 moves along the flow direction of the hole sealing liquid under the pressure of the hole sealing liquid, and then the first outer conical surface 2133 is attached to the first inner conical surface 2112 to close the first medium channel 216, so that the internal channel of the section of the filter pipe 1 is sealed, and the pressure of the connecting pipe 2 and the internal channel of the section of the water braid 4 is maintained; when gas is pumped out, the first outer tapered surface 2133 is not in contact with the first inner tapered surface 2112, so that the first medium passage 216 is opened again.
As shown in fig. 4, a second regulating valve 35 for controlling the on-off of the adapter tube 3 is arranged in the rear port of the adapter tube; a plurality of foaming agent sleeves II32 are bonded on the outer wall of the adapter tube 3 at intervals, annular grooves are formed in the outer wall of the adapter tube 3 corresponding to the foaming agent sleeves II32, annular spaces are formed by the annular grooves and the foaming agent sleeves II32, and solid foaming agents II33 are packaged in the annular spaces; the bottom of the annular groove is provided with an opening II31 communicated with the inner cavity of the adapter tube 3. Under the conventional state, the foaming agent sleeve II32 and the solid foaming agent II33 block the opening II31, so that the inner cavity of the adapter tube 3 is completely sealed in the radial direction. The front end of the adapter tube 3 is provided with an external thread, and the rear end opening is internally provided with an internal thread. Furthermore, a gas outlet is provided in the section of the adapter tube 3 from the second control valve 35 to the adjacent solid blowing agent II33, into which a quick-change coupling 34 is fitted for connection to a gas line.
As shown in fig. 5, the second regulating valve 35 includes a second valve body 351 provided with a second medium passage 356, and a second valve spool 353 movably provided in the second valve body 351; the second valve element 353 has a second valve rod 3531 and a second boss 3532 provided on the second valve rod 3531, and a second stop shoulder 3511 is provided in the second valve body 351; the second boss 3532 is provided with a second outer conical surface 3533, one side of the second shoulder 3511 facing the second boss 3532 is provided with a second inner conical surface 3512, and the second outer conical surface 3533 and the second inner conical surface 3512 can be attached to each other to block the second medium channel 356. One end, close to the water braid 4, of a second valve rod 3531 of the second valve core 353 is connected with a second sliding seat 355 which is slidably installed in the second valve body 351, the axis of the second valve rod 3531 is aligned with the axis of the water braid 4, the second sliding seat 355 abuts against the front end face of the water braid 4, and the second valve core 353 is linked with the second sliding seat 355, so that the water braid 4 drives the second valve core 353 to move by pressing the second sliding seat 355; the other end of the second valve rod 3531 is connected to a second fixed seat 354 fixedly installed in the second valve body 351, and a second elastic element 352 is further arranged at the other end, and the second elastic element 352 is a spring; the second sliding seat 355 and the second fixed seat 354 are provided with a second through hole 357 communicating with the second medium passage 356. When hole sealing is carried out, the second valve core 353 moves along the direction of hole sealing liquid under the action of the water braid 4, and the second outer conical surface 3533 is not in contact with the second inner conical surface 3512 so that the second medium channel 356 is opened; when gas is pumped and discharged, the water braid 4 is removed, the second valve core 353 loses the action of the water braid 4 and moves along the gas flow direction under the action of the second elastic element 352, and the second outer conical surface 3533 is attached to the second inner conical surface 3512 so that the second medium channel 356 is closed, and the uniqueness and the tightness of the inner channel for gas pumping and discharging are ensured.
As shown in fig. 6, the sealing liquid flow through grooves 41 are circumferentially distributed at the front end of the water braid 4 to prevent the water braid 4 from blocking the second through hole 357 when abutting against the second sliding seat 355, so as to ensure that the sealing liquid smoothly enters the second regulating valve 35. The water braid 4 is provided with more than two liquid injection ports, and the liquid injection ports are provided with injection pipelines 42. When drilling, the conventional drilling water is injected from one of the injection pipelines 42; when hole sealing is needed, water for conventional drilling is injected into one injection pipeline 42, and other media are injected into the other injection pipelines 42, so that the water-based hole sealing liquid can be formed by mixing. More than two liquid injection ports are arranged on the water braid 4 at the same time, so that the hole sealing liquid can be conveniently blended, and different hole sealing liquids can be prepared. The front end of water pigtail 4 still is equipped with the external screw thread to with the interior internal thread fit connection of switching pipe 3 back port.
In this embodiment, the outer diameter of filter tube 1, connecting pipe 2, switching pipe 3 and water pigtail 4 matches with the outer diameter of drilling rod, and can be connected with the rig, and the theory of operation of this drilling rod formula hole packer is:
basic requirements of the drilling machine are as follows: the water swivel 4 has been installed, and the switching pipe 3 can pass through the rig holder smoothly.
(1) The filter pipe 1 is placed in a clamp holder of the drilling machine;
(2) the first connecting pipe 2 is arranged between the power head of the drilling machine and the clamp holder;
(3) a plurality of connecting pipes 2 are additionally connected as required;
(4) after the connecting pipe 2 is connected, the adapter pipe 3 is connected;
(5) according to the requirement, corresponding hole sealing media are communicated with the corresponding injection pipelines 42 of the water swivel 4 so as to add hole sealing liquid;
(6) filling hole sealing liquid: slowly injecting hole sealing liquid into the internal channel, wherein the hole sealing liquid pressure is lower than the closing set value of the first regulating valve 21, the first regulating valves 21 of the connecting pipes 2 connected with the filter pipe 1 are conducted at the moment, and the first regulating valves 21 of the other connecting pipes 2 are in an opening state under the action of the limiting plates 25 in the adjacent connecting pipes 2;
(7) after the connecting pipe 2 is filled with the hole sealing liquid, increasing the hole sealing liquid pressure until the hole sealing liquid reaches the closing set value of the first regulating valve 21 in the connecting pipe 2;
(8) the first regulating valve 21 in the connecting pipe 2 connected with the filtering pipe 1 is closed;
(9) continuously increasing the pressure of the hole sealing liquid, breaking the foaming agent sleeve I22 and the foaming agent sleeve II32, enabling the hole sealing liquid to enter a space between the outer wall of the hole sealer and the inner wall of the coal hole from the opening I24 and the opening II31, foaming and expanding the solid foaming agent I23 and the solid foaming agent II33 when meeting the hole sealing liquid, and filling the space between the outer wall of the hole sealer and the inner wall of the coal hole to finish hole sealing; after foaming and condensation are finished, the foaming material cannot be ventilated, and the air tightness is ensured; in order to prevent the foamed material from flowing into the connecting pipe 2 and the adapter pipe 3, the opening I24 and the opening II31 have enough length-diameter ratio or are provided with one-way devices to prevent the foamed material from flowing back;
(10) removing hole sealing liquid: when the coal hole is in a non-horizontal state and goes down, the water braid 4 is slowly screwed out, the hole sealing liquid pressure is reduced, the first regulating valve 21 in the connecting pipe 2 connected with the filter pipe 1 is opened, and the hole sealing liquid flows into the coal hole through the small hole 11 on the filter pipe 1; when the hole is positioned in the upward hole, the hole sealing liquid automatically overflows along the unscrewing of the water braid 4;
(11) gas channel formation: the water braid 4 is slowly screwed out, and after the water braid 4 is screwed out to a certain position, the second regulating valve 35 in the adapter pipe 3 loses the action of the water braid 4 and is closed, so that a gas channel is formed from the filter pipe 1 to the internal channel of the adapter pipe 3 and is used for gas drainage;
(12) gas drainage: the quick-change connector 34 of the adapter tube 3 is inserted into an external gas pipeline, gas is pumped into the internal channel through the small hole 11 on the filter tube 1 and flows to the gas discharge port along the internal channel, and therefore gas drainage is completed.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. Drilling rod formula hole packer, its characterized in that: the device comprises a filter pipe, a connecting pipe, a switching pipe and a water braid which are sequentially connected in front and back, wherein inner cavities of the filter pipe, the connecting pipe, the switching pipe and the water braid form an internal channel; the front end opening of the filter pipe is closed, and a plurality of small holes communicated with the inner cavity of the filter pipe are distributed on the filter pipe; a first adjusting valve for controlling the on-off of the connecting pipe is arranged in the front port of the connecting pipe, a second adjusting valve for controlling the on-off of the connecting pipe is arranged in the rear port of the adapter pipe, a plurality of foaming agent sleeves are bonded on the outer walls of the connecting pipe and the adapter pipe at intervals, annular grooves are arranged on the outer walls of the connecting pipe and the adapter pipe at positions corresponding to the foaming agent sleeves, the annular grooves and the foaming agent sleeves are matched to form an annular space, a solid foaming agent is sealed in the annular space, and openings communicated with the inner cavities of the connecting pipe and the adapter pipe are formed in the bottoms of the annular grooves; a gas discharge port is formed in a section from the second regulating valve to the adjacent solid foaming agent on the adapter tube; the water braid is provided with a liquid injection port, and the front end of the water braid props against the second regulating valve;
when hole sealing is carried out, hole sealing liquid is injected into the internal channel through the water braid, the hole sealing liquid pressure is lower than the closing set value of the first regulating valve, the first regulating valve of the connecting pipe connected with the filter pipe is conducted at the moment, and after the connecting pipe is filled with the hole sealing liquid, the hole sealing liquid pressure is increased until the closing set value of the first regulating valve in the connecting pipe is reached; the first regulating valve is closed, the hole sealing hydraulic pressure is continuously increased, the foaming agent sleeve is broken by the continuously increased hole sealing hydraulic pressure, the hole sealing liquid is mixed with the solid foaming agent, the solid foaming agent expands to fill the space between the outer wall of the hole sealing device and the inner wall of the coal hole, and hole sealing is finished; when gas is pumped and discharged, the water braid is removed, gas is pumped into the internal channel through the small holes distributed on the filter pipe, the flow direction of the gas is opposite to that of hole sealing liquid, the second regulating valve is closed after losing the effect of the water braid, and the first regulating valve is in an open state.
2. The drill-pipe hole packer according to claim 1, wherein: the first regulating valve comprises a first valve body provided with a first medium channel and a first valve core movably arranged in the first valve body, and two ends of the first valve core are respectively provided with a first elastic piece; in an initial state, the first valve core is not in contact with the first medium channel so that the first medium channel is in an open state; when hole sealing is carried out, the first valve core moves along the flow direction of the hole sealing liquid under the pressure of hole sealing liquid and is contacted with the first medium channel so as to close the first medium channel; when gas is pumped and discharged, the first valve core is not contacted with the first medium channel so that the first medium channel is in an open state again.
3. The drill-pipe hole packer according to claim 2, wherein: the first valve core is provided with a first valve rod and a first boss arranged on the first valve rod, and a first retaining shoulder is arranged in the first valve body; the first boss is provided with a first outer conical surface, one side of the first retaining shoulder facing the first boss is provided with a first inner conical surface, and the first outer conical surface and the first inner conical surface can be mutually attached to block the first medium channel.
4. The drill-pipe hole packer according to claim 2, wherein: one end of the first valve core, which is close to the filter pipe, is connected with a first fixed seat which is integrally constructed with the first valve body, and the other end of the first valve core is connected with a first sliding seat which is slidably arranged in the first valve body; the first sliding seat is provided with a first through hole communicated with the first medium channel.
5. The drill-pipe hole packer according to claim 1, wherein: the second regulating valve comprises a second valve body provided with a second medium channel and a second valve core movably arranged in the second valve body, one end, close to the water braid, of the second valve core abuts against the water braid, and a second elastic piece is arranged at the other end of the second valve core; when hole sealing is carried out, the second valve core moves along the direction of hole sealing liquid under the action of the water braid and is not contacted with the second medium channel so as to be opened; when the gas is pumped and discharged, the second valve core loses the water swivel action and moves along the gas flow direction under the action of the second elastic element, and the second valve core is contacted with the second medium channel so as to be closed.
6. The drill-pipe hole packer according to claim 5, wherein: the second valve core is provided with a second valve rod and a second boss arranged on the second valve rod, and a second retaining shoulder is arranged in the second valve body; the second boss is provided with a second outer conical surface, one side of the second retaining shoulder facing the second boss is provided with a second inner conical surface, and the second outer conical surface and the second inner conical surface can be mutually attached to block the second medium channel.
7. The drill-pipe hole packer according to claim 5, wherein: one end, close to the water braid, of the second valve spool is connected with a second sliding seat which is slidably installed in the second valve body, and the other end of the second valve spool is connected with a second fixed seat which is fixedly installed in the second valve body; the second sliding seat and the second fixed seat are provided with second through holes communicated with the second medium channel.
8. The drill-pipe hole packer according to claim 1, wherein: more than one connecting pipe is arranged; when more than two connecting pipes are arranged, a limiting plate is arranged in the rear port of each connecting pipe, and the limiting plate butts against the first regulating valve in the front port of the adjacent connecting pipe so as to enable the first regulating valve to be in an opening state in an initial state; the limiting plate is provided with a through hole communicated with the inner cavity of the connecting pipe.
9. The drill-pipe hole packer according to claim 1, wherein: the front end of the water braid is provided with a hole sealing liquid flow through groove; the liquid injection ports on the water braid are more than two.
10. The drill-pipe hole packer according to claim 1, wherein: the outer diameter of filter tube, connecting pipe, switching pipe and water pigtail matches with the outer diameter of drilling rod, and can be connected with the rig.
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| CN111271023B (en) * | 2020-03-09 | 2022-03-15 | 中煤科工集团西安研究院有限公司 | Push type hole internal integrated rapid hole sealing device and method |
| CN114876405B (en) * | 2022-06-20 | 2023-07-21 | 中煤科工集团重庆研究院有限公司 | Spiral drill rod type hole packer |
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