CN111472685B - Intermittent dynamic condensation deep hole drilling method - Google Patents
Intermittent dynamic condensation deep hole drilling method Download PDFInfo
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- CN111472685B CN111472685B CN202010300578.4A CN202010300578A CN111472685B CN 111472685 B CN111472685 B CN 111472685B CN 202010300578 A CN202010300578 A CN 202010300578A CN 111472685 B CN111472685 B CN 111472685B
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- 238000005553 drilling Methods 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000009833 condensation Methods 0.000 title claims abstract description 22
- 230000005494 condensation Effects 0.000 title claims abstract description 22
- 239000003245 coal Substances 0.000 claims abstract description 30
- 239000007789 gas Substances 0.000 claims abstract description 26
- 239000011435 rock Substances 0.000 claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000000605 extraction Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- 238000010276 construction Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000011083 cement mortar Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000008014 freezing Effects 0.000 claims 1
- 238000007710 freezing Methods 0.000 claims 1
- 230000035939 shock Effects 0.000 claims 1
- 230000008569 process Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses an intermittent dynamic condensation deep hole drilling method, which comprises the following steps: 1) drilling construction is carried out on the coal rock layer with the easy-to-collapse hole by using a drill bit with a slightly larger diameter, and the corresponding steel pipe is inserted into the drill hole of the coal rock layer and is sealed; 2) the steel pipe, the tee joint and the sealing device are connected by using the flange plate, so that the whole drilling space is airtight; 3) starting a drilling machine to perform drilling operation, and stopping drilling when the drilling bit drills not less than 3m each time; 4) injecting liquid nitrogen into the drilled hole by using a drilling machine and an anti-impact temperature drill rod to enable the surrounding strata such as soft coal rock mass and the like to be frozen in a deep layer; 5) repeating the step 3 and the step 4, stopping and withdrawing the drill rod and the whole sealing device after the drill hole is drilled to the designed depth of the drill hole; 6) and (3) inserting an extraction pipe into the drilled hole reaching the designed depth in time, sealing the drilled hole under pressure, and connecting the drilled hole into an extraction pipeline for extraction. The invention can prevent a large amount of adsorbed gas in the coal body around the drill hole from gushing out, prevent the drill hole from collapsing and improve the drilling efficiency.
Description
Technical Field
The invention belongs to the technical field of mine construction and construction, and particularly relates to an intermittent dynamic condensation deep hole drilling method.
Background
The gas in the coal rock stratum is pre-pumped by constructing extraction drill holes for high gas mines and coal and gas outburst mines, so that the coal rock stratum is pre-pumpedThe laminar gas content is reduced to the critical value of the projection (8 m)3T) below, thereby eliminating the hidden danger of coal and gas outburst.
The construction mode of the gas extraction hole under the coal mine in China mostly adopts a rotary drilling machine to operate, the drilling machine is simple in structure, strong in stability and convenient to install, in order to meet the requirements of temperature reduction and slag removal during drilling of a drill bit, hydraulic power or wind power is usually adopted for slag removal, so that the supporting strength inside a drill hole is not enough, and the problem of stability of drilling the hole can occur particularly in the drilling process of a soft and easily collapsed coal rock stratum and after the final hole is drilled. Especially in high gas and outburst mines, the coal bed gas pressure is generally in the range of 0.74-6MPa, and the drilling of the drill bit can cause a large amount of gas adsorbed in the coal body around the drill hole to flow into the drill hole, so that a drill hole spray hole is formed or the coal and the gas are outburst during drilling, and the drill hole is collapsed or blocked, thereby causing phenomena of drill holding, drill clamping, top drilling and the like during drilling.
Based on the reasons, in high-gas and coal and gas outburst coal rock layers, especially in coal rock layers with longer mechanical mining working faces, drill holes with longer depths are difficult to be drilled, so that the drilling operation efficiency is low, and the improvement of the mine gas extraction effect is severely restricted.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an intermittent dynamic condensation deep hole drilling method, which can solve the existing problems in the drilling process of a drill hole, increase the strength of a coal-rock mass stratum around the drill hole, prevent a large amount of adsorbed gas in the coal-rock mass around the drill hole from flowing out, prevent the drill hole from collapsing, improve the drilling efficiency and the like.
An intermittent dynamic condensation deep hole drilling method, comprising the following steps:
step one, drilling construction is carried out on a soft coal rock stratum by using a drill bit, when the opening length of a drill hole reaches a certain depth, drilling is stopped, the drill rod is withdrawn, a steel pipe is inserted into the drill hole of the coal rock stratum, and cement mortar is used for sealing treatment to be qualified;
step two, a first flange plate, a tee joint and a second flange plate are sequentially connected to the end of the steel pipe in a sealing mode, and the end portion of the second flange plate is connected with a drilling machine through a sealing device; reinforcing the first flange plate and surrounding rocks around by using an anchor rod so that the inside of a drill hole can bear the maximum design pressure value;
a third valve is arranged on a non-connecting port of the tee joint;
thirdly, the liquid nitrogen tank wagon and the water tank are respectively connected with the drilling machine in a sealing mode through pipelines, and the performance of all equipment is detected to guarantee that construction requirements are met;
a first valve is arranged on a pipeline for connecting the liquid nitrogen tank wagon and the drilling machine; a second valve is arranged on a pipeline for connecting the water tank with the drilling machine;
step four, closing the first valve, opening the second valve and the third valve, opening the drilling machine, drilling by using the temperature-resistant drill rod and the drill bit, stopping drilling when the drill bit drills to a certain depth, and closing the second valve and the third valve;
step five, opening a first valve, driving a temperature-resistant drill rod by using a drilling machine to inject liquid nitrogen into a drill hole, stopping pressurizing when the pressure in the drill hole reaches a certain pressure, and keeping a certain time to enable the stratum around the formed hole to be frozen deeply;
step six, repeating the operation steps four to step six in sequence, stopping and withdrawing the drilling machine, the drill rod and the whole sealing device after drilling to the designed depth of the drilled hole;
and seventhly, installing an extraction pipe to the bottom of the drilled borehole in real time, arranging a fourth valve on the extraction pipe, sealing the hole under pressure to reach the designed length, opening the fourth valve, connecting the fourth valve to a gas extraction pipe network, and extracting the gas.
Further, according to the intermittent dynamic condensation deep hole drilling method, a pressure gauge is laid on the tee joint.
Further, according to the intermittent dynamic condensation deep hole drilling method, a pressure maintaining one-way valve is arranged between the temperature resistant drill rod and the sealing device.
Further, in the intermittent dynamic condensation deep hole drilling method as described above, in the first step, the drilling is stopped when the length of the drill hole opening is ≧ 2 m.
Further, the intermittent dynamic condensation deep hole drilling method as described above stops drilling every time the drill bit drills ≧ 3m in the fourth step.
Further, the intermittent dynamic condensation deep hole drilling method as described above, wherein the pressurization is stopped and maintained for at least 3min in the fifth step, so that the stratum around the formed hole can be frozen deeply.
Further, in the intermittent dynamic condensation deep hole drilling method as described above, the diameter of one of the drill holes is larger than that of the steel pipe, and the range of the drill holes is 5mm-10 mm.
Further, in the intermittent dynamic condensation deep hole drilling method, in the second step, the first flange plate and surrounding rocks are reinforced by the anchor rod, so that the safety factor of the borehole capable of bearing the designed lowest pressure is 1.5.
The invention has the beneficial effects that:
the invention aims at all coal beds of soft strata, high gas mines and coal and gas outburst mines, in particular coal rock strata with the firmness coefficient F value less than 3, and liquid nitrogen is injected into the drill holes at regular intervals and intervals to keep the coal rock strata in a certain range of the drill holes in a frozen state, thereby increasing the strength of coal bodies around the drill holes, preventing the drill holes from collapsing, improving the drilling efficiency, blocking a large amount of desorbed gas from flowing into the drill holes, and preventing coal and gas outburst accidents and gas overrun problems of roadway systems during drilling.
Drawings
FIG. 1 is a schematic diagram of an intermittent dynamic condensation deep hole drilling configuration of the present invention;
FIG. 2 is a schematic view of an extraction tube configuration of the present invention;
in the figure: the method comprises the following steps of 1-steel pipe, 2-first flange plate, 3-anchor rod, 4-tee joint, 5-pressure gauge, 6-1 first valve, 6-2 second valve, 6-3 third valve, 6-4 fourth valve, 7-second flange plate, 8-sealing device, 9-pressure maintaining one-way valve, 10-drilling machine, 11-liquid nitrogen tank car, 12-water tank, 13-temperature resistant drill rod, 14-coal body and 15-extraction pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provides an intermittent dynamic condensation deep hole drilling method, as shown in fig. 1, comprising the following steps:
(1) firstly, drilling construction is carried out on a coal rock stratum by using drill bits with different diameters, drilling is stopped when the length of a drill hole is not less than 2m, the drill rod is withdrawn, then the steel pipe 1 is inserted into the drill hole of the coal rock stratum, and cement mortar is used for sealing treatment;
(2) connecting a steel pipe 1 in the drill hole, a tee joint 4 and a sealing device 8 by using a flange 2 to ensure that the whole drill hole space is airtight, wherein the tee joint is provided with a pressure gauge 5 and a third valve 6-3, and then reinforcing the flange 2 and surrounding rocks and other strata by using not less than 4 anchor rods 3 to ensure that the maximum design pressure value can be borne in the drill hole;
(3) a liquid nitrogen tank wagon 11 and a water tank 12 are respectively connected with a drilling machine 10 through a pipeline, and an anti-temperature-shock drilling rod 13 of the drilling rod 10 is connected to a sealing device 8; wherein, the outlet ends of the liquid nitrogen tank wagon 11 and the water tank 12 are respectively provided with a first valve 6-1 and a second valve 6-2, a one-way valve 9 is additionally arranged between the drilling machine 10 and the sealing device 8, and then the performance of all equipment is detected to ensure that the construction requirements are met;
(4) starting a drilling machine and drilling by using drill bits with different diameters according to design, stopping drilling when the drilling depth is not less than 3m after the opening section of the drill hole is sealed, and closing the second valve 6-2 and the third valve 6-3;
(5) opening a first valve 6-1, driving an anti-temperature-shock drill pipe 13 by using a drilling machine 10 to inject liquid nitrogen into a drill hole, stopping pressurizing and keeping for 3min when the pressure in the drill hole reaches a design value of more than or equal to 3MPa so that stratums such as a soft coal rock body and the like of a formed hole section can be frozen in a deep layer;
(6) repeating the fourth to sixth steps in sequence, stopping and withdrawing the drill rod and the whole sealing device after the drill hole is drilled to the designed depth of the drill hole
(7) As shown in fig. 2, installing a steel pipe or a PVC pipe to the bottom of the drilled hole in the drilled hole, sealing the hole under pressure according to the mature technology, opening a fourth valve 6-4, connecting a gas extraction pipe network, and extracting gas.
Furthermore, the diameter of the drill hole is larger than that of the steel pipe, and the range of the diameter of the drill hole is required to be 5mm-10 mm.
Further, reinforce ring flange and surrounding rock all around with the stock and make in the drilling can bear design minimum pressure's the coefficient of safety can take 1.5.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. An intermittent dynamic condensation deep hole drilling method, characterized by comprising the following steps:
step one, drilling construction is carried out on a soft coal rock stratum by using a drill bit, when the opening length of a drill hole reaches a certain depth, drilling is stopped, the drill rod is withdrawn, a steel pipe (1) is inserted into the drill hole of the coal rock stratum, and cement mortar is used for sealing treatment to be qualified;
step two, a first flange (2), a tee joint (4) and a second flange (7) are sequentially connected to a port of the steel pipe (1) in a sealing manner, and the end part of the second flange (7) is connected with a drilling machine (10) through a sealing device (8); then reinforcing the first flange plate (2) and surrounding rocks around by using an anchor rod (3) so that the inside of a drill hole can bear the maximum design pressure value;
a non-connection port of the tee joint (4) is provided with a third valve (6-3);
thirdly, the liquid nitrogen tank wagon (11) and the water tank (12) are respectively connected with the drilling machine (10) in a sealing mode through pipelines, and an anti-temperature-shock drill rod (13) of the drill rod (10) is connected to the sealing device (8); wherein, the outlet ends of the liquid nitrogen tank wagon (11) and the water tank (12) are respectively provided with a first valve (6-1) and a second valve (6-2), and the performance of all the devices is detected to ensure that the construction requirements are met;
step four, closing the first valve (6-1), opening the second valve (6-2) and the third valve (6-3), starting the drilling machine (10), drilling by using an anti-temperature-shock drill rod (13) and a drill bit, stopping drilling when the drill bit drills to a certain depth, and closing the second valve (6-2) and the third valve (6-3);
step five, opening a first valve (6-1), driving a temperature-resistant drill rod (13) by using a drilling machine (10) to inject liquid nitrogen into the drilled hole, and stopping pressurizing and keeping a certain time to enable the stratum around the drilled hole to be frozen deeply when the pressure in the drilled hole reaches a certain pressure;
step six, repeating the operation steps four to step six in sequence, stopping and withdrawing the drilling machine, the drill rod and the whole sealing device after drilling to the designed depth of the drilled hole;
seventhly, installing an extraction pipe (15) to the bottom of the drilled borehole in real time, arranging a fourth valve (6-4) on the extraction pipe (15), sealing the hole under pressure to reach the designed length, opening the valve (6-4), connecting the valve to a gas extraction pipe network, and extracting gas;
a pressure gauge (5) is laid on the tee joint (4).
2. The intermittent dynamic condensation deep hole drilling method according to claim 1, characterized in that a pressure holding one-way valve (9) is installed between the temperature shock resistant drill pipe (13) and the sealing device (8).
3. The intermittent dynamic condensation deep hole drilling method of claim 1, wherein drilling is stopped when a borehole opening length is ≧ 2m in the first step.
4. The intermittent dynamic condensation deep hole drilling method of claim 1, wherein drilling is stopped at every drill bit drilling ≧ 3m in the fourth step.
5. The intermittent dynamic condensation deep hole drilling method of claim 1, wherein stopping pressurization and maintaining for at least 3min in step five enables deep freezing of the formation surrounding the drilled hole.
6. The method for intermittent dynamic condensation deep hole drilling according to claim 1, characterized in that the diameter of one of said boreholes is larger than the diameter of the steel pipe (1) and ranges between 5mm and 10 mm.
7. The intermittent dynamic condensation deep hole drilling method as claimed in claim 1, wherein in the second step, the first flange (2) and surrounding rock are reinforced by the anchor rod (3) so that the safety factor of the borehole capable of bearing the designed lowest pressure is 1.5.
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| CN202010300578.4A CN111472685B (en) | 2020-04-16 | 2020-04-16 | Intermittent dynamic condensation deep hole drilling method |
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| CN202010300578.4A CN111472685B (en) | 2020-04-16 | 2020-04-16 | Intermittent dynamic condensation deep hole drilling method |
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| CN111472685B true CN111472685B (en) | 2021-10-01 |
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| CN115898367B (en) * | 2022-11-08 | 2023-10-03 | 四川省金钻地质矿产勘探工程有限责任公司 | Measurement device for advanced geological forecast drilling of tunnel and application method thereof |
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