AU2016231638B2 - A type of high pressure resistant borehole sealing device and method - Google Patents

A type of high pressure resistant borehole sealing device and method Download PDF

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Publication number
AU2016231638B2
AU2016231638B2 AU2016231638A AU2016231638A AU2016231638B2 AU 2016231638 B2 AU2016231638 B2 AU 2016231638B2 AU 2016231638 A AU2016231638 A AU 2016231638A AU 2016231638 A AU2016231638 A AU 2016231638A AU 2016231638 B2 AU2016231638 B2 AU 2016231638B2
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AU
Australia
Prior art keywords
borehole
slurry
slurry injection
flexible bladder
pressure resistant
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AU2016231638A
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AU2016231638A1 (en
Inventor
Weimin Cheng
Zhen Liu
Guanhua NI
Gang Wang
Yanbin Yu
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Shandong University of Science and Technology
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Shandong University of Science and Technology
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Priority to CN201610015413.6A priority Critical patent/CN105673064B/en
Priority to CN201610015413.6 priority
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Publication of AU2016231638A1 publication Critical patent/AU2016231638A1/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like

Abstract

The present invention discloses a high pressure resistant borehole sealing device and method, wherein the said device comprises slurry injection cylinders interconnected with threads, the flexible bladder I is welded at the front of the cylinder, the flexible bladder II is welded at a place 1.5-3m away from the rear of the cylinder, several holes are opened on the cylinder surfaces in the flexible bladder || and flexible bladder I, a slurry injection pipe is welded at the top inside the cylinder and a slurry injection port and a slurry discharge port are opened on the cylinder surfaces. The conventional borehole and slotted borehole are arranged through conventional drilling and hydro-slotting perforation technology respectively, the slurry to seal boreholes is injected into the flexible bladder I and the flexile bladder || via the holes on the cylinder surfaces to seal the conventional borehole and slotted borehole respectively. The slurry is injected into the coal seam boreholes via the slurry injection pipe, and after the slurry to seal boreholes is solidified and when the slotted borehole is subject to high pressure, the coal wall at the front of the conventional borehole prevents the flexible bladder I from moving outside, achieving the hydro-slotting-based high pressure resistant borehole sealing method. 0 11-1 2 3 13 15 4 5 6 16 7 8 14

Description

A TYPE OF HIGH PRESSURE RESISTANT BOREHOLE SEALING DEVICE AND
METHOD
FIELD OF THE INVENTION [0001] The present invention relates to a type of high pressure resistant borehole sealing device and method, belongs to the technical field of the downhole gas control in the coal mine, especially applies to the sealing works of high pressure resistant boreholes of coal seams where the boreholes are easy to collapse or hard to be sealed.
BACKGROUND TO THE INVENTION [0002] Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field.
[0003] The national policy on coal mine gas control specifies that the high-gas mine shafts must be subject to gas drainage before coal mining and the gas drainage is a fundamental measure for gas control. With the deep development of the studies on the coal seam gas control, many scholars reach a certain consensus, state that the stress relief and permeability improvement measure is the development direction of the future coal seam gas control, especially the development direction of the deep coal seam gas control, namely, coal seam blasting, hydraulic fracturing, coal seam water injection, hydro-slotting perforation, hydraulic punching and other measures may be used to promote the stress relief and permeability improvement of the coal seams, improve the permeability of the coal seam and strengthen the pre-drained coal seam gas. However, the prerequisite for the successful implementation of these measures is to effectively seal the high pressure resistant boreholes, and whether the boreholes can withstand high pressure, whether they are sealed tightly or whether there are any other deficiencies directly determine the success or failure of the stress relief and permeability improvement measure. In the process of the implementation of the stress relief and permeability improvement measure in the gas drainage boreholes of the coal seams where the boreholes are easy to collapse or hard to be sealed, failure to sealing the boreholes tightly with the existing high pressure resistant borehole sealing method, breaking off at the combination point between the coal wall and the slurry to seal boreholes and other factors result in lower capability of withstanding high pressure, time and energy consuming, thus leading to failure to achieve the desired effect of borehole high pressure resistant sealing, so there is an urgent need to provide a novel type of high pressure resistant borehole sealing
-22016231638 02 Mar 2020 method which can meet the function of withstanding high pressure for a long time and can overcome the problems that exist in the prior arts.
SUMMARY OF THE INVENTION [0004] It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.
[0005] More particularly, the present invention is aimed at overcoming the problems that exist in the prior arts such as failure to seal the high pressure resistant boreholes tightly and breaking off at the combination point between the coal wall and the slurry and providing a type of hydro-slotting-based high pressure resistant borehole sealing device and method that that are easy to operate, with low cost and good effectiveness.
[0006] To this end, a first aspect of the present invention provides a high pressure resistant borehole sealing device, which comprises a slurry injection cylinder assembly having slurry injection cylinders interconnected with threads, a flexible bladder I welded at the front of the slurry injection cylinder assembly, a flexible bladder II welded at a place 1.5-3m away from the rear of the slurry injection cylinder assembly, wherein several holes are opened on cylinder surfaces in fluid communication with the flexible bladder II and flexible bladder I, a slurry injection pipe welded toward one side and inside of at least one of the slurry injection cylinders and connectable to a slurry injection pump via a slurry injection port on a surface of the at least one cylinder, wherein the slurry injection pipe injects slurry into coal seam boreholes via a slurry discharge port open on a surface of the slurry injection cylinder assembly.
[0007] Preferably, the said slurry injection cylinder is 15-18m in length and 90mm in diameter and the slurry injection pipe is 16mm in diameter.
[0008] Preferably, the said slurry injection port is located at an outer cylinder surface of the flexible bladder II and the slurry discharge port is located on the cylinder surface between the flexible bladder II and the flexible bladder I.
[0009] Preferably, the said flexible bladder II is 0.5-1 m in length and 110mm in diameter while the flexible bladder I is 1-2m in length and 150mm in diameter.
-32016231638 02 Mar 2020 [0010] A second aspect of the present invention provides a high pressure resistant borehole sealing method of the said device as described above, wherein it comprises the following steps:
a. a conventional borehole with a diameter of 100mm and a length of 15-18m is drilled towards the inside of a coal seam with a conventional method in such a way that the borehole is perpendicular to a roadway wall;
b. the drilling is continued at the bottom of the conventional borehole using a conventional hydro-slotting perforation technology, and a slotted borehole with a diameter of 120-140mm and a length of 80-100m is drilled through hydraulic-rotary slotting;
c. the cylinders are connected sequentially and sent to the inside of the conventional borehole so that the flexible bladder I is located in the slotted borehole just after it passes through the conventional borehole;
d. a slurry storage tank is connected with the slurry injection pump which is connected to the slurry injection cylinder assembly and then to the slurry injection port via high pressure rubber hoses respectively;
e. the slurry injection pump is started and a valve is opened, then the slurry to seal boreholes is injected into the slurry injection cylinder assembly and passes through the holes to fill the flexible bladder I and the flexible bladder II which expand to seal the slotted borehole and conventional borehole, respectively;
f. when the slurry injection pump displays that a slurry injection pressure rise is stopped, the valve is closed and another valve is opened to inject the slurry to seal boreholes into a conventional borehole space between the flexible bladder I and the flexible bladder II using the slurry injection pipe;
g. after the slurry to seal boreholes is solidified and when the slotted borehole is subject to high pressure, a coal wall at the front of the conventional borehole prevents the flexible bladder I from moving outside.
[0011] Advantageously, the present invention makes it possible to seal the high pressure resistant boreholes effectively, enables the boreholes to withstand the high pressure impact inside them and also helps the hydraulic measures strengthen the gas drainage in the process of the implementation of various hydraulic measures in the gas drainage boreholes of the coal seams where the boreholes are easy to collapse or hard to be sealed. After the slurry to seal boreholes is solidified and when the slotted borehole is subject to high pressure, the coal wall at the front of the conventional borehole prevents the flexible bladder I from moving outside, achieving the effective sealing of high pressure resistant boreholes of the soft coal seams. The
-42016231638 02 Mar 2020 present invention is easy to operate and with low cost, good effectiveness, small workload and a wide range of practicality.
BRIEF DESCRIPTION OF DRAWINGS [0012] One or more preferred embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings in which:
[0013] Figure 1 illustrates a schematic view of the structure of a type of high pressure resistant borehole sealing device of the present invention.
[0014] Figure 2 illustrates a schematic view of the embodiment of a type of high pressure resistant borehole sealing method of the present invention.
[0015] As shown in these figures, [0016] 1. slurry injection port, 2. flexible bladder II, 3. slurry injection pipe, 4. slurry discharge port, 5. thread, 6. cylinder, 7. hole, 8. flexible bladder I, 9. slurry injection pump, 10. high pressure rubber hose, 11-1 valve, 11-2. valve, 12. conventional borehole, 13. coal wall, 14. slotted borehole, 15. coal seam, 16. slurry to seal boreholes.
DETAILED DESCRIPTION [0017] One or more preferred embodiments of the present invention are further described here in conjunction with the drawings:
[0018] As shown in FIG. 1, the present invention discloses a type of high pressure resistant borehole sealing device, which comprises slurry injection cylinders 6 interconnected with threads 5, the flexible bladder I 8 is welded at the front of the cylinder 6, the flexible bladder II 2 is welded at a place 1.5-3m away from the rear of the cylinder 6, several holes 7 are opened on the cylinder 6 surfaces in the flexible bladder II 2 and flexible bladder I 8, the slurry injection pipe 3 is welded at the top inside the cylinder 6 and connected to the slurry injection pump via the slurry injection port 1 on the cylinder 6 surface and injects slurry into the coal seam boreholes via the slurry discharge port 4 on the cylinder 6 surface. The said slurry injection cylinder 6 is 15-18m in length and 90mm in diameter and the slurry injection pipe 3 is 16mm in diameter. The slurry injection port 1 is located at the outer cylinder 6 surface of the flexible bladder II 2 and the slurry discharge port 4 is located on the cylinder 6 surface between the
- 52016231638 02 Mar 2020 flexible bladder II 2 and the flexible bladder I 8. The flexible bladder II 2 is 0.5-1 m in length and
110m in diameter while the flexible bladder I 8 is 1-2m in length and 150mm in diameter.
[0019] The present invention discloses a high pressure resistant borehole sealing method which comprises the following steps: firstly, the conventional borehole 12 with a diameter of 100mm and a length of 15-18m is drilled towards the inside of the coal seam 15 with a conventional method in such a way that the borehole is perpendicular to the roadway wall; the drilling is continued at the bottom of the conventional borehole 12 using the conventional hydro-slotting perforation technology, and a slotted borehole 14 with a diameter of 120-140mm and a length of 80-100m is drilled through hydraulic-rotary slotting; the cylinders 6 are connected sequentially and sent to the inside of the conventional borehole 12 so that the flexible bladder I 8 is located in the slotted borehole 14 just after it passes through the conventional borehole 12; the slurry storage tank 17 is connected with the slurry injection pump 9 which is connected to the slurry injection cylinder 6 and then to the slurry injection port
I via the high pressure rubber hoses respectively; the slurry injection pump 9 is started and the valve 11-2 is opened, then the slurry to seal boreholes 16 is injected into the slurry injection cylinder 6 and passes through the holes 7 to fill the flexible bladder I 8 and the flexible bladder
II 2 which expand to seal the slotted borehole 14 and conventional borehole 12, respectively; when the slurry injection pump 9 displays that the slurry injection pressure rise is stopped, the valve 11-2 is closed and another valve 11-1 is opened to inject the slurry to seal boreholes 16 into the conventional borehole 12 space between the flexible bladder I 8 and the flexible bladder II 2 via the slurry injection pipe 3; after the slurry to seal boreholes 16 is solidified and when the slotted borehole 14 is subject to high pressure, the coal wall 13 at the front of the conventional borehole 12 prevents the flexible bladder I 8 from moving, achieving the hydroslotting-based high pressure resistant borehole sealing method.
[0020] Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”.

Claims (8)

1. A high pressure resistant borehole sealing device, which comprises a slurry injection cylinder assembly having slurry injection cylinders interconnected with threads, a flexible bladder I welded at the front of the slurry injection cylinder assembly, a flexible bladder II welded at a place 1.5-3m away from the rear of the slurry injection cylinder assembly, wherein several holes are opened on cylinder surfaces in fluid communication with the flexible bladder II and flexible bladder I, and a slurry injection pipe welded toward one side and inside of at least one of the slurry injection cylinders and connectable to a slurry injection pump via a slurry injection port on a surface of the at least one cylinder, wherein the slurry injection pipe injects slurry into coal seam boreholes via a slurry discharge port open on a surface of the slurry injection cylinder assembly.
2. A high pressure resistant borehole sealing device according to claim 1, wherein the slurry injection cylinder assembly is 15-18m in length and 90mm in diameter.
3. A high pressure resistant borehole sealing device according to claim 1 or 2, wherein the slurry injection pipe is 16mm in diameter.
4. A high pressure resistant borehole sealing device according to any one of the preceding claims, wherein the said slurry injection port is located at an outer cylinder surface of the slurry injection cylinder to which the flexible bladder II has been welded.
5. A high pressure resistant borehole sealing device according to any one of the preceding claims, wherein the slurry discharge port is located on the surface of the slurry injection cylinder assembly between the flexible bladder II and the flexible bladder I.
6. A high pressure resistant borehole sealing device according to any one of the preceding claims, wherein the said flexible bladder II is 0.5-1 m in length and 110mm in diameter.
7. A high pressure resistant borehole sealing device according to any one of the preceding claims, wherein the flexible bladder I is 1-2m in length and 150mm in diameter.
8. A high pressure resistant borehole sealing method of the said device according to any one of the preceding claims, wherein it comprises the following steps:
(a) a conventional borehole with a diameter of 100mm and a length of 15-18m is
-7drilled towards the inside of a coal seam with a conventional method in such a way that the borehole is perpendicular to a roadway wall;
(b) the drilling is continued at the bottom of the conventional borehole using a conventional hydro-slotting perforation technology, and a slotted borehole with a diameter of 120-140mm and a length of 80-100m is drilled through hydraulic-rotary slotting;
(c) . the cylinders are connected sequentially and sent to the inside of the conventional borehole so that the flexible bladder I is located in the slotted borehole just after it passes through the conventional borehole;
(d) a slurry storage tank is connected with the slurry injection pump which is connected to the slurry injection cylinder assembly and then to the slurry injection port via high pressure rubber hoses respectively;
(e) the slurry injection pump is started and a valve is opened, then the slurry to seal boreholes is injected into the slurry injection cylinder assembly and passes through the holes to fill the flexible bladder I and the flexible bladder II which expand to seal the slotted borehole and conventional borehole, respectively;
(f) when the slurry injection pump displays that a slurry injection pressure rise is stopped, the valve is closed and another valve is opened to inject the slurry to seal boreholes into a conventional borehole space between the flexible bladder I and the flexible bladder II using the slurry injection pipe;
(g) after the slurry to seal boreholes is solidified and when the slotted borehole is subject to high pressure, a coal wall at the front of the conventional borehole prevents the flexible bladder I from moving outside.
AU2016231638A 2016-01-11 2016-09-23 A type of high pressure resistant borehole sealing device and method Active AU2016231638B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201610015413.6A CN105673064B (en) 2016-01-11 2016-01-11 A kind of high pressure resistant drilled hole sealing device and method
CN201610015413.6 2016-01-11

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AU2016231638A1 AU2016231638A1 (en) 2017-07-27
AU2016231638B2 true AU2016231638B2 (en) 2020-03-26

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* Cited by examiner, † Cited by third party
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CN110608012A (en) * 2019-08-30 2019-12-24 贵州大学 Gas hole packer with pressure relief function

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CN104343415A (en) * 2014-10-20 2015-02-11 中煤科工集团重庆研究院有限公司 Gas extraction drilling hole injection expanding type bag hole sealing device
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US20100314124A1 (en) * 2009-06-16 2010-12-16 Schlumberger Technology Corporation Open-hole stimulation system
CN202250166U (en) * 2011-10-08 2012-05-30 晋城凤凰实业有限责任公司 Secondary high-pressure grouting hole packer
CN103452525A (en) * 2013-09-06 2013-12-18 河南理工大学 Gas pumping fixing occluder and use method thereof
CN105019856A (en) * 2014-04-18 2015-11-04 河南中煤矿业科技发展有限公司 Slip casting capsule hole packer
CN204040999U (en) * 2014-08-19 2014-12-24 徐州中矿贝壳迈宁矿业科技有限公司 A kind of hole diameter for coal-bed gas pump drainage is to hole packer
CN104343415A (en) * 2014-10-20 2015-02-11 中煤科工集团重庆研究院有限公司 Gas extraction drilling hole injection expanding type bag hole sealing device
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CN105673064B (en) 2018-03-20
CN105673064A (en) 2016-06-15
AU2016231638A1 (en) 2017-07-27

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