CN213269864U - This long drilling in coal seam is with pressing taking out integrative device - Google Patents
This long drilling in coal seam is with pressing taking out integrative device Download PDFInfo
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- CN213269864U CN213269864U CN202022100659.8U CN202022100659U CN213269864U CN 213269864 U CN213269864 U CN 213269864U CN 202022100659 U CN202022100659 U CN 202022100659U CN 213269864 U CN213269864 U CN 213269864U
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Abstract
The utility model discloses a pressing and pumping integrated device for long drilling of a coal seam, which comprises at least two sieve holes pipes with sieve holes, wherein a fracturing sleeve is arranged in the sieve holes in a sliding fit manner, a ball seat structure for accommodating a dissolvable fracturing ball is arranged on the fracturing sleeve, and a first retaining ring is arranged on the fracturing pipe at the inner end of the fracturing sleeve and used for limiting the position of the fracturing sleeve during fracturing; from the hole bottom of the drill hole to the hole opening, inner hole channels of the ball seat part on the fracturing sleeve are sequentially enlarged and can pass through a soluble fracturing ball which is close to the hole bottom; the fracturing sleeve is fixedly connected with the sieve hole pipe through a temporary fixing pin, and the temporary fixing pin is arranged by utilizing sieve holes; the fracturing sleeve can move under the pushing of fracturing fluid to cut off the temporary fixing pin and open the sieve pore; the outside of the sieve pore is wrapped with a sieve pore protective film. The beneficial effects of the utility model are that, can be used for this coal seam fracturing and gas drainage conveniently, reliably, need not to take into account the piece factor that falls, can effectively improve and take out efficiency, reduce and take out the cost.
Description
Technical Field
The utility model belongs to coal bed gas development field, concretely relates to this long drilling in coal seam is with pressing take out integrative device.
Background
Due to the complexity of geological conditions of coal in Chongqing areas, after main coal measure strata are deposited, strong tectonic movement is carried out, coal body structures are damaged strongly, coal beds of the Chongqing areas are mostly soft coal beds, the Chongqing areas have the characteristics of low coal bed hardness, high gas pressure and content, poor air permeability and the like, and the difficulty in extracting coal bed gas (gas) is high. Through many years of exploration, the hydraulic fracturing permeability increase is one of key technical measures for gas extraction of a low-permeability coal seam, a core technology of water treatment of gas and a working mode of firstly pressing and then pumping are formed, and a certain effect is achieved. However, this method has the following limitations: (1) the conventional fracturing drilling mainly adopts floor roadway cross-layer drilling or the coal seam bedding drilling for fracturing, and the construction amount of the roadway and the drilling is large and the cost is high; (2) each fracturing drill hole is usually fractured at the bottom of the hole only once, so that the number of the fracturing drill holes is large, the hole sealing and fracturing cost is high, the single-hole fracture influence range is small, the gas extraction quantity is small, the drill hole utilization rate is low, the extraction efficiency is low, the standard reaching time is long, and the extraction, extraction and excavation deployment are short; the method for increasing the permeability of large-area regionalized hydraulic fracturing and efficiently extracting gas is urgently needed to be developed.
Along with the development of unconventional oil and gas industry, horizontal well drilling technology and multi-stage staged fracturing technology are rapidly developed, and accordingly the horizontal well drilling technology is widely applied to long-borehole drilling in coal mines, but in the staged fracturing technology, due to the limitation of narrow space in coal mines, huge ground fracturing equipment cannot be accommodated, the power of an underground fracturing pump set is limited, the construction displacement is far smaller than that of the ground fracturing pump set, the requirement for increasing the permeability of the whole long-borehole fracturing cannot be met, and therefore research and development of the coal-bed directional long-borehole staged fracturing permeability increasing and gas extraction technology and equipment are urgently needed. The uniform permeability increase of the regional coal seam is realized, the gas extraction effect is improved, and the gas dynamic disaster risk is reduced.
At present, the research of the underground coal mine directional long drilling hole staged fracturing technology is carried out domestically, a pitching fracturing method of bag staged hole sealing is generally adopted, although the method can realize the reutilization of a fracturing tool, in the practical application of the method, the fracturing tool is difficult to take out due to the fact that the fracturing tool falls off after staged fracturing in the open hole directional long drilling hole, once the fracturing tool cannot be taken out due to the limitation of the size of a sliding sleeve, a sliding sleeve opening of the sliding sleeve becomes a unique channel for communicating a coal bed with a drilling hole, the pumping efficiency after the fracturing is greatly influenced due to the limitation of the opening size of the sliding sleeve opening, the application place of the method is greatly limited, and the method is particularly difficult to be applied to the coal bed with serious block falling phenomenon. For this reason, improvements are required.
Disclosure of Invention
The utility model aims at providing a not enough that the fracturing is difficult to use in this coal seam to current bowling, provide a this long drilling in coal seam is with pressing and take out integrative device, the device utilizes the sieve mesh of sieve hole pipe to carry out fracturing and take out and adopt, and set up the fracturing cover at the sieve hole intraductally, be connected through the interim fixed pin that can cut between sliding sleeve and the sieve hole pipe, in order to utilize fracturing pressure to bulldoze at the fracturing initial stage and to dissolve fracturing ball and sliding sleeve, in order to cut interim fixed pin and expose the sieve mesh, realize the fracturing purpose. When the device is used for fracturing extraction, full-hole deep grouting and hole sealing can be adopted, and after fracturing and extraction are completed, the fracturing device does not need to be taken out for reuse and can be extracted along with media in the coal seam mining process, so that the block falling phenomenon does not need to be considered, and the device can be conveniently used for fracturing and extraction of the coal seam.
In order to achieve the above purpose, the present invention adopts the following technical solution.
The fracturing and pumping integrated device for long drilling of the coal seam comprises a fracturing pipe, wherein at least two sieve hole pipes with sieve holes are connected in series on the fracturing pipe, a fracturing sleeve is in sliding fit in the sieve hole pipes, a ball seat structure for accommodating a dissolvable fracturing ball is arranged on the fracturing sleeve, and a first retaining ring is arranged on the fracturing pipe positioned at the inner end of the fracturing sleeve and used for limiting the position of the fracturing sleeve during fracturing; from the hole bottom of the drill hole to the hole opening, inner hole channels of the ball seat structure on the fracturing sleeve are sequentially enlarged and can pass through the dissolvable fracturing ball which is close to the fracturing section and faces the direction of the hole bottom; the fracturing sleeve is fixedly connected with the sieve pore pipe through a temporary fixing pin, one end of the temporary fixing pin is fixed on the fracturing sleeve, and the other end of the temporary fixing pin penetrates through a corresponding sieve pore; the fracturing sleeve can move along with the soluble fracturing ball in the process that the fracturing fluid pushes and presses the soluble fracturing ball so as to shear the temporary fixing pin and open the sieve pore; the outside of the sieve pore is wrapped with a sieve pore protective film.
Adopt this device of aforementioned scheme, through concatenating at least two sieve pore pipes that have the sieve mesh on fracturing pipe, make it form the structure that is applicable to the staged fracturing mode of bowling fracturing, when fracturing ball adopted soluble ball, accomplish the fracturing back at whole fracturing stages, utilize the salt solution to carry out the fracturing fluid replacement to dissolve the fracturing ball, so that fracturing intraduct is unobstructed. The first baffle ring is used for blocking a corresponding fracturing sleeve in the fracturing process, and fracturing pressure is transmitted to the fracturing sleeve through the pressure ball and then sequentially transmitted to a hole bottom rock body through the fracturing sleeve, the first baffle ring, the fracturing pipe and the guide shoe; the outside of each sieve pore is wrapped with a sieve pore protection film to form protection to the sieve pore when grouting and sealing the holes, so that the sieve pore is prevented from being blocked by hole sealing cement slurry, the films can be easily pierced by jet flow formed by fracturing fluid through the sieve pore, and a channel communicated with a coal bed is ejected at a hole sealing section to realize fracturing and gas extraction. The structure is simple and the function is reliable. And because the device is used for fracturing extraction, full-hole deep grouting hole sealing is needed, after fracturing and extraction are completed, the fracturing device does not need to be taken out for reuse, and can be excavated along with media in the coal seam mining process, so that the device does not need to consider the block falling phenomenon, and can be conveniently used for fracturing and extraction of the coal seam. And the fracturing sleeve can be arranged as required, is not limited by the size and specification of the conventional sliding sleeve, and can meet the length requirement of 2-3 meters.
Preferably, the far end of the pressure difference sliding sleeve on the fracturing pipe is provided with a guide shoe through a hole bottom pipe section. So that the integrated device can be smoothly placed into the drill hole, and the extraction efficiency is improved.
Preferably, the end part of the fracturing pipe exposed out of the drill hole is provided with a pressure relief bypass and a ball throwing bypass, the pressure relief bypass is provided with a pressure relief valve, and the outlet end of the pressure relief bypass is provided with a connector connected with a gas-water separator; the pressure relief bypass is detachably connected with a gas-water separator through the interface; and a ball throwing valve is arranged on the ball throwing bypass. The pipe orifice of the fracturing pipe is respectively provided with a ball throwing port and a gas-water separator interface through two bypasses and is controlled by corresponding control valves, so that the ball throwing port can realize fracturing ball throwing, the gas-water separator interface can be connected with a gas-water separator, and then a gas extraction system is connected, the purpose that the fracturing pipe is used as a gas extraction pipe is ensured, the gas extraction preparation work is reduced, the extraction efficiency can be effectively improved, and the extraction cost is reduced.
Further preferably, a centralizer is arranged between the fracturing pipe and the inner wall of the drill hole, and the centralizer is close to the hole opening of the drill hole. So that the fracturing pipe can be temporarily fixed in the middle of the drilled hole, the size of the annular space is ensured to be uniform, and the reliability of hole sealing is ensured.
Preferably, a second baffle ring is further arranged on the fracturing pipe through an annular groove; the second baffle ring is in an elastic baffle ring structure; the fracturing sleeve front end is the toper, and the fracturing sleeve can utilize the toper structure expansion second of front end to keep off the ring under the exogenic action to move to the opposite side from one side that the second kept off the ring. After fracturing and fracturing are finished, the fracturing sleeve is limited between the two retaining rings, so that sieve holes are prevented from being blocked by the sliding sleeve, and smooth fracturing and extraction channels are ensured; and the second baffle ring is outwards expanded under the extrusion of the front-end taper structure of the fracturing sleeve so as to form a space for the fracturing sleeve to pass through. Preferably, the inner diameter of the first baffle ring is smaller than the taper small end of the front end of the corresponding sliding sleeve. The supporting strength of the fracturing sleeve to the dissoluble fracturing ball is enhanced, and the fracturing bearing capacity is improved.
The beneficial effects of the utility model are that, the device has fracturing and takes out the drainage function concurrently, cuts off interim fixed pin through utilizing fracturing pressure and makes the sliding sleeve remove and expose the sieve mesh to the fender ring that utilizes both ends prevents that the sliding sleeve from removing behind the fracturing and stopping up the sieve mesh, ensures that fracturing and taking out the passageway unblocked, can be used for this coal seam conveniently, reliably, need not to consider and fall the piece factor, can effectively improve and take out drainage efficiency, reduces and takes out the drainage cost.
Drawings
Fig. 1 is a schematic structural view of the medium-pressure pumping integrated device of the present invention.
Fig. 2 is a schematic view of the connection structure of the sliding sleeve and the perforated pipe in the device of the present invention.
Fig. 3 is an enlarged view of a portion a in fig. 1 according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, which are not intended to limit the scope of the embodiments described herein.
Referring to fig. 1 and 2, the pressing and pumping integrated device for long drilling of a coal seam comprises a fracturing pipe 1, wherein at least two sieve holes pipes with sieve holes 9 are connected to the fracturing pipe 1 in series, a fracturing sleeve 2 is matched in the sieve holes pipes in a sliding mode, a ball seat structure for accommodating a soluble fracturing ball 7 is arranged on the fracturing sleeve 2, a first retaining ring 15 is arranged on the fracturing pipe 1 located at the inner end of the fracturing sleeve 2, and the first retaining ring 15 is used for limiting the position of the fracturing sleeve 2 during fracturing; from the hole bottom of the drill hole to the orifice, the inner hole channels of the ball seat on the fracturing sleeve 2 are sequentially enlarged and can pass through the dissolvable fracturing ball 7 which is close to the fracturing section and faces the direction of the hole bottom; the fracturing sleeve 2 is fixedly connected with the sieve pore pipe through two temporary fixing pins 8 which are uniformly distributed on the circumference, one end of each temporary fixing pin 8 is fixed on the fracturing sleeve 2, and the other end of each temporary fixing pin is arranged in a corresponding sieve pore 9 in a penetrating manner; the fracturing sleeve 2 can move along with the soluble fracturing ball 7 in the process that the fracturing fluid pushes and presses the soluble fracturing ball 7 so as to shear the temporary fixing pin 8 and open the sieve hole 9; the outside of the sieve holes 9 is wrapped with a sieve hole protective film 10. When the fracturing sleeve is manufactured, the diameter of the through hole in the sleeve wall of the fracturing sleeve meets the requirement of the extraction drift diameter, and the aperture is larger than that of a sliding sleeve only used for fracturing.
Wherein, the pipe section of the fracturing pipe 1 close to the bottom of the drilling hole is connected with a guide shoe 3 in series. A pressure relief bypass 4 and a ball throwing bypass 11 are arranged at the end part of the fracturing pipe 1 exposed out of the drill hole, a pressure relief valve 5 is arranged on the pressure relief bypass 4, and an outlet end of the pressure relief bypass 4 is provided with a connector connected with a gas-water separator; the pressure relief bypass 4 is detachably connected with a gas-water separator 6 through the interface; and a ball throwing valve 12 is arranged on the ball throwing bypass 11. A centralizer 13 is arranged between the fracturing pipe 1 and the inner wall of the drill hole, and the centralizer 13 is close to the hole opening of the drill hole. A second retaining ring 14 is further arranged on the fracturing pipe 1 through an annular groove; the second baffle ring 14 is an elastic baffle ring structure; the front end of the fracturing sleeve 2 is conical, and the fracturing sleeve 2 can expand the second retaining ring 14 by utilizing the conical structure at the front end under the action of external force so as to move from one side of the second retaining ring 14 to the other side. The inner diameter of the first baffle ring 15 is smaller than the taper small end of the front end of the corresponding sliding sleeve.
The device of the embodiment also comprises a grouting pipe 16, a slurry return pipe 17, a pressure gauge 18 and a one-way valve 19; the grouting pipe 16 is used for injecting cement paste when drilling and sealing holes; the slurry return pipe 17 is mainly used for returning slurry to an orifice during grouting and hole sealing, and can also be used for secondary grouting; the pressure gauge 18 is used for monitoring the pressure in the hole in the whole process; the check valve 19 is arranged at the pipe orifice of the fracturing pipe 1, and the check valve 19 is used for fracturing and pressure maintaining; the inlet end of the one-way valve 19 forms a pipeline connecting interface 20, and the fracturing pipe 1 is connected with a fracturing pump or a fracturing pump set through a high-pressure pipeline through the pipeline connecting interface 20.
In this implementation, fracturing cover 2 is equipped with two, and the hole passageway of two fracturing cover 2 is outwards crescent by the hole inner end, and the dissoluble fracturing ball that sits on the fracturing cover 2 near the hole bottom can pass the hole passageway of that fracturing cover 2 near the drill way.
The fracturing set 2 may also be provided in three, four or more, depending on the fracturing stage design requirements. Similarly, a dissolvable fracturing ball seated on a fracturing sleeve 2 near the bottom of the hole can pass through the internal bore passage of the immediately adjacent fracturing sleeve 2 near the direction of the orifice.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The pressure pumping integrated device for long drilling of the coal seam is characterized by comprising a fracturing pipe (1), wherein at least two sieve hole pipes with sieve holes (9) are connected to the fracturing pipe (1) in series, a fracturing sleeve (2) is matched in the sieve hole pipes in a sliding mode, a ball seat structure for accommodating a dissolvable fracturing ball (7) is arranged on the fracturing sleeve (2), a first retaining ring (15) is arranged on the fracturing pipe (1) located at the inner end of the fracturing sleeve (2) through an annular groove, and the position of the fracturing sleeve (2) is limited when the first retaining ring (15) is used for fracturing; from the hole bottom of the drill hole to the hole opening, inner hole channels of the ball seat structure on the fracturing sleeve (2) are sequentially enlarged and can pass through a dissoluble fracturing ball (7) which is close to a fracturing section and faces the direction of the hole bottom; the fracturing sleeve (2) is fixedly connected with the sieve pore pipe through a temporary fixing pin (8), one end of the temporary fixing pin (8) is fixed on the fracturing sleeve (2), and the other end of the temporary fixing pin penetrates through a corresponding sieve pore (9); the fracturing sleeve (2) can move along with the soluble fracturing ball (7) in the process that the fracturing fluid pushes the soluble fracturing ball (7) so as to shear the temporary fixing pin (8) and open the sieve hole (9); the outside of the sieve pore (9) is wrapped with a sieve pore protective film (10).
2. The device according to claim 1, characterized in that a guide shoe (3) is connected in series on the section of the fracturing pipe (1) near the bottom of the borehole.
3. The device according to claim 1, characterized in that the end of the fracturing pipe (1) exposed out of the borehole is provided with a pressure relief bypass (4) and a ball throwing bypass (11), the pressure relief bypass (4) is provided with a pressure relief valve (5), and the outlet end of the pressure relief bypass (4) is provided with a connector connected with a gas-water separator; the pressure relief bypass (4) is detachably connected with a gas-water separator (6) through the interface; and a ball throwing valve (12) is arranged on the ball throwing bypass (11).
4. A device according to claim 3, characterized in that a centralizer (13) is arranged between the fracturing pipe (1) and the inner wall of the borehole, the centralizer (13) being located close to the orifice of the borehole.
5. The device according to any one of claims 1 to 4, characterized in that a second baffle ring (14) is further arranged on the fracturing pipe (1) through an annular groove; the second baffle ring (14) is in an elastic baffle ring structure; the front end of the fracturing sleeve (2) is conical, and the fracturing sleeve (2) can expand the second retaining ring (14) by utilizing the conical structure at the front end under the action of external force so as to move from one side of the second retaining ring (14) to the other side.
6. The device according to claim 5, characterized in that the inner diameter of the first baffle ring (15) is smaller than the tapered small end of the front end of the corresponding sliding sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022100659.8U CN213269864U (en) | 2020-09-22 | 2020-09-22 | This long drilling in coal seam is with pressing taking out integrative device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022100659.8U CN213269864U (en) | 2020-09-22 | 2020-09-22 | This long drilling in coal seam is with pressing taking out integrative device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213269864U true CN213269864U (en) | 2021-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022100659.8U Expired - Fee Related CN213269864U (en) | 2020-09-22 | 2020-09-22 | This long drilling in coal seam is with pressing taking out integrative device |
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| Country | Link |
|---|---|
| CN (1) | CN213269864U (en) |
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2020
- 2020-09-22 CN CN202022100659.8U patent/CN213269864U/en not_active Expired - Fee Related
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