CN117145382A - Soft coal seam heel tube impact and large spiral alternate shield drilling and gas control method - Google Patents
Soft coal seam heel tube impact and large spiral alternate shield drilling and gas control method Download PDFInfo
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- CN117145382A CN117145382A CN202311182716.3A CN202311182716A CN117145382A CN 117145382 A CN117145382 A CN 117145382A CN 202311182716 A CN202311182716 A CN 202311182716A CN 117145382 A CN117145382 A CN 117145382A
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- 238000005553 drilling Methods 0.000 title claims abstract description 155
- 239000003245 coal Substances 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 230000008569 process Effects 0.000 claims abstract description 39
- 239000011435 rock Substances 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims description 25
- 239000007924 injection Substances 0.000 claims description 25
- 239000002775 capsule Substances 0.000 claims description 24
- 238000005516 engineering process Methods 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 11
- 238000010276 construction Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 16
- 230000015572 biosynthetic process Effects 0.000 description 7
- 239000002817 coal dust Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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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
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/22—Rods or pipes with helical structure
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/06—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for setting packers
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
-
- 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
- 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
-
- 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
- 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
- E21B43/10—Setting of casings, screens, liners or the like in wells
-
- 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
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention belongs to the technical field of soft coal seam drilling and gas control, and particularly relates to a soft coal seam heel tube impact and large spiral alternate shield drilling and gas control method. Comprising the following steps: drilling in the rock stratum by adopting a heel tube impact drilling mode; exchanging the casing into a screen pipe, and drilling until the drilling tool penetrates the rock stratum; continuing drilling forward in the coal seam until the friction between the sieve tube and the coal body is increased until the drilling process cannot be continued; the plugging plug is sent into the screen pipe, and after the plugging plug reaches the position, the screen pipe is plugged by the operation of inflating or filling water through the guide pipe; performing air leakage or water drainage operation to take out the sealing plug from the sieve tube, and then drilling to form a cavity; continuing to drill the screen pipe forwards, and passing through the formed cavity; repeating until drilling to the final hole position, plugging the drilled hole, and extracting the coal seam gas. The invention saves construction cost, reduces labor intensity, effectively improves pore-forming effect and improves drilling efficiency.
Description
Technical Field
The invention belongs to the technical field of soft coal seam drilling and gas control, and particularly relates to a soft coal seam heel tube impact and large spiral alternate shield drilling and gas control method.
Background
The ultra-deep buried coal seam has the characteristics of large buried depth (approximately 1000 meters), high ground stress, high gas pressure, large section, small inclination angle, soft coal seam and the like, and the pore forming of the gas extraction pore of the ultra-deep buried coal seam is a worldwide difficult problem, and particularly when the coal seam is soft, the problems of difficult drilling, large-area hole collapse, drilling closure and the like are more remarkable. A plurality of exploratory researches are carried out at home for the difficult problems of drilling and pore-forming of coal beds under soft and high-stress conditions. The fast drilling anti-sticking drill is as follows: a drilling technology of a high-power, high-torque and low-rotation-speed full hydraulic drilling machine, a PAM (polyacrylamide) aqueous solution configuration flocculant hole washing and slag discharging technology, a large-diameter groove spiral drill rod composite powder discharging technology, a nitrogen slag discharging pneumatic directional drilling technology and the like; there are two main approaches to preventing collapse of the hole: firstly, optimizing drilling parameters by researching deformation and collapse rules of high-plasticity coal under high stress; and secondly, the lower protective tube/sleeve is prevented from collapsing in the drilling process of the drill hole. However, when the coal bed is too deep (approximately 1000 m), the prior art has poor pore forming effect and lower drilling efficiency due to the coupling effect of the high ground stress and the pulverized coal of ultra deep burial, high ground stress, soft coal bed, large coal bed thickness and small interval.
Disclosure of Invention
The invention provides a method for alternately shielding drilling and gas control by using a soft coal seam with pipe following impact and a large spiral, which aims to solve the problems that when the coal seam is soft, the gas extraction effect is not good, the coal uncovering condition is not achieved, the drilling is difficult, the large area of holes collapse, the drilling holes are closed and the like, thereby improving the pore-forming effect of the ultra-deep buried soft coal seam and improving the drilling efficiency.
The invention adopts the following technical scheme: a soft coal seam heel tube impact and large spiral alternative shield drilling and gas control method comprises the following steps:
s1: drilling in the rock stratum by adopting a heel pipe impact drilling mode, and leaving the casing in the rock stratum for supporting;
s2: changing the casing into a screen pipe, and drilling by adopting a pipe-following impact drilling mode until a drilling tool penetrates through a rock stratum;
s3: continuing drilling forward in the coal seam until the friction between the sieve tube and the coal body is increased until the drilling process cannot be continued;
s4: the plugging plug is sent into the screen pipe, after the plugging plug reaches the position, the plugging plug is inflated or filled with water through the guide pipe, then water injection is carried out through the water injection pipe to start water impact, and coal dust flows from a high-pressure area to a low-pressure area of the screen pipe along with water flow when the coal dust is impacted by water;
s5: after the water impact is finished, performing air leakage or water drainage operation to take out the sealing plug from the sieve tube, drilling, and conveying pulverized coal out of the drilled holes so as to form a cavity in the coal seam drilling process;
s6: adopting a heel pipe impact drilling technology, continuing to drill the screen pipe forwards, and continuing to drill until the screen pipe cannot continue again through the cavity formed in the step S4;
s7: and (4) repeating the steps S4-S6 until drilling to the final hole position, plugging the drilled holes, and extracting the coal seam gas.
In some embodiments, the diameter of the casing is greater than the screen diameter.
In some embodiments, in step S1, when the distance between the drilling tool and the coal seam is S 1 Stopping drilling at the time S 1 ≥0.2m。
In some embodiments, the plugging plug comprises a front plugging capsule and a rear plugging capsule, wherein the plugging capsules at the rear side of the plugging plug are fixed with the water injection pipe, the two plugging capsules are connected through a connecting rod, and the two plugging capsules are connected with a conduit for inflation and deflation or water filling and drainage operation.
In some embodiments, in step S5, the cavity length is less than or equal to 0.5m, and the main influencing factors are the coal body firmness and the collapse degree.
In some embodiments, in step S7, the diameter of the screen used is progressively smaller each time steps S4-S6 are repeated.
In some embodiments, in step S7, the borehole is drilled to a diameter at which the screen is incapable of supporting the drilling activity of the drilling tool.
In some embodiments, in step S5, the drilling is performed using a large diameter auger drilling mode, wherein the large auger stem drills the coal body through a casing in the formation and a screen in the coal seam.
In some embodiments, the large auger stem utilizes special surface irregularities of the flight to increase friction fit water impact to better expel coal fines and make the coal body more prone to cavity formation.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for alternately shielding a pipe-following impact technology and a large auger technology, which can be used for continuously boring after a cavity is manufactured in a coal bed. The formation of the cavity reduces the coal resistance and avoids the drilling risk caused by the increase of drilling depth, torque and stress of the drilling tool.
A protective hole sieve tube is reserved in the soft coal seam to prevent gas from being unable to be extracted due to hole collapse; the large spiral drill rod plays a role in transporting coal dust in the hole protection pipe and plays a role in drilling and pressure relief in a coal bed outside the hole protection pipe. The invention has the advantages of high pore-forming speed, large pore-forming diameter, long pore-forming length, good pore-wall protection effect, difficult drilling sticking, effective solving of the problems that the gas cannot be effectively extracted and the coal uncovering condition and the drilling is difficult, the large-area hole collapse, the drilling is closed, the drilling sticking and the like are not achieved when the coal seam is soft, saving the construction cost, reducing the labor intensity, effectively improving the pore-forming effect, and improving the drilling efficiency.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic illustration of a rock penetrating process drilling;
FIG. 3 is a schematic illustration of drilling into a coal seam;
FIG. 4 is a schematic diagram of a coal seam drilling process;
FIG. 5 is a schematic diagram of a water injection impingement process;
FIG. 6 is a schematic diagram of a large spiral drilling process;
FIG. 7 is a schematic illustration of a screen extension process;
FIG. 8 is a schematic diagram of a continuous water injection impact process;
FIG. 9 is a schematic diagram of a continued large spiral drilling process;
FIG. 10 is a schematic illustration of a screen extension process;
FIG. 11 is a schematic view of the present invention after drilling;
FIG. 12 is a schematic view of coal seam gas extraction;
FIG. 13 is a schematic illustration of a closure plug structure;
FIG. 14 is a schematic diagram of a shutoff water injection;
FIG. 15 is a schematic diagram of a large spiral;
in the figure, 1-rock stratum, 2-coal seam, 3-drilling tool, 4-sleeve, 5-screen pipe, 6-sealing plug, 7-large spiral drill rod, 8-cavity, 9-air pump, 10-connecting rod, 11-sealing capsule, 12-water injection pipe and 13-conduit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in figure 1, the method for alternately shielding drilling and gas control by using the soft coal seam heel tube impact and the large spiral comprises the following steps.
S1: as shown in fig. 2, the rock penetration process. The process adopts heel tube impactThe drilling mode passes through the rock stratum 1, and when the distance between the drilling tool 3 and the coal bed 2 is S 1 Stopping drilling, taking out the drilling tool 3 from the casing 4, leaving the casing 4 in the rock stratum 1 for supporting, and setting the diameter of the casing 4 to phi 1 。
The pipe-following impact drilling is a drilling technology which uses compressed air or water impact as power, and a pipe-following drilling tool performs impact rotation under the action of the torque of an impactor and a drilling machine and synchronously follows a sleeve, namely, the drilling tool is pressed into the sleeve while drilling, the drilling tool is taken out from the sleeve after the drilling is completed, the sleeve is used for protecting walls, and the protection effect on the wall of a hole in a soft coal seam is obvious. The central drill bit and the concentric sleeve sleeved outside the central drill bit impact to break rock and coal to form holes, and the sleeve is brought into the holes by the reaming effect of the concentric sleeve. A key slot is arranged in the concentric sleeve so as to be connected with the drill bit, and after the key slot reaches a preset position, the central drill bit withdraws from the concentric sleeve through reversing; the concentric sleeve is connected with the sleeve by a buckle. The detachable drill bit is adopted, so that the drill bits with different diameters are conveniently replaced to be matched with the casings with different diameters and the sieve tube; in addition, the drill bit is in nested fit with the sleeve and the screen pipe clamping groove to realize detachable sleeving, so that the drilling tool can be conveniently taken out of the sleeve and the screen pipe.
S2: as shown in fig. 3, into the coal seam process. The process still adopts the following pipe impact drilling technology, the casing 4 is replaced by a screen pipe 5, and the diameter of the screen pipe 5 is phi 2 （φ 2 <φ 1 ). The drilling tool 3 reaches the distance seam S via the formation casing 4 1 Where the crossing thickness is S 1 Starts drilling in the coal seam 2 until the drilling tool 3 penetrates the rock formation 1.
S3: as shown in fig. 4, the coal seam drilling process. After entering the coal seam, drilling forward in the coal seam 2 is continued. When drilling length L in coal seam 2 1 During the process, the friction between the sieve tube 5 and the coal body is increased due to the crushing and ground stress effects of the coal body, so that the drilling process cannot be continued.
S4: as shown in fig. 5, the water injection impingement process. The non-aerated or non-filled plugging plug 6 is sent into the screen pipe 5, the screen pipe 5 is plugged through the air-filling or water-filling operation of the guide pipe after the plugging plug reaches the position, then water injection is carried out through the water injection pipe to start water impact, and coal dust flows from the high-pressure area to the low-pressure area along with water flow when being impacted by water. After the water impact is completed, the plugging plug 6 is removed from the screen 5 by performing a venting or draining operation.
As shown in fig. 13, the plugging plug 6 comprises a front plugging capsule 11 and a rear plugging capsule 11, wherein the plugging capsule 11 at the rear side of the plugging capsule is fixed with a water injection pipe 12, the two plugging capsules 11 are connected through a connecting rod 10, and the two plugging capsules 11 are connected with a conduit 13 for inflation and deflation or water filling and drainage operations.
Because of the action of ground stress, friction is generated between the sieve tube and the coal body in the drilling process to prevent the drilling from being carried out, and the invention provides a method for simulating a 'two-plug-one-injection' hole sealing mode to carry out plugging water injection operation in the sieve tube so as to carry out water impact on the coal body. The invention provides a drawable water pipe plugging block, which is characterized in that a connecting rod 10 is used for connecting two plugging capsules 11, and a water pipe 12 is arranged at the rear side of the plugging capsules for water injection. When the impact drilling with the pipe cannot be continued, the drilling tool is taken out from the screen pipe, the uninflated or uninflated plugging block is conveyed to the front end of the screen pipe through the sleeve pipe and the screen pipe, and then the plugging capsule is inflated or filled with water to complete plugging of the screen pipe; after the plugging is finished, water is injected through the water injection pipe 12, and water impact is carried out on the coal body, so that a gap is formed between the coal body and the sieve tube; after the water impact is finished, the plugging capsule is subjected to air leakage or water drainage operation through the guide pipe 13, and is taken out of the sieve tube, so that the plugging water injection operation is finished. Unlike the two-plug-one-injection method, the plugging plug has the problem that the filler is difficult to take out, and can be inflated and deflated or filled and drained through the guide pipe 13, so that the plugging plug can be easily moved in the screen pipe, fixed or taken out of the screen pipe, and is convenient and efficient. The coal body is a high-pressure area due to the ground stress; under the combined action of water impact and ground stress, the outer wall of the sieve tube and the area nearby the sieve tube also form a high-pressure area, only the orifice of the sieve tube is a low-pressure area, coal dust can flow from the high-pressure area to the low-pressure area along with water impact, and the coal dust is excavated by the large spiral blades. After the water injection is impacted for a period of time, gaps appear between the outer wall of the screen pipe of the impact section and the coal body, and the problem of drilling inhibition caused by friction is effectively solved. The plugging water injection is matched with the subsequent large spiral drilling, so that a displacement space is created for carrying out pipe following impact again.
S5: as shown in fig. 6, a large spiral drilling process. The process adopts a large-diameter spiral drilling mode, and a large spiral drill rod 7 reaches the forefront end of the screen pipe 5 through the sleeve pipe 4 in the rock stratum 1 and the screen pipe 5 in the coal seam 2 to drill the coal body. Because the drilling tool is a large spiral drill rod, coal dust is conveyed out of the drill hole along threads, so that a cavity 8 is formed in the coal body in the large spiral drilling process. The special spiral sheets with uneven surfaces are used for increasing friction and water impact to better discharge pulverized coal, so that a cavity is easier to form in the coal body.
The large spiral drilling has the characteristics of high hole forming speed, large hole forming diameter and suitability for drilling with a pipe, and is a drilling technology which is relatively suitable for soft coal seams. The large spiral drilling efficiency is high, no flushing is needed, the equipment is simple, vibration is avoided, the noise is low, the drilling efficiency is high, the sampling is timely, the cost is low, and the like, and the large spiral drilling device is suitable for drilling various soft strata without water and with little water. The large spiral drilling is divided into a long screw and a short screw, and the short screw uses a small spiral drilling machine for engineering geological investigation; the large-scale spiral drilling machine for the long screw is used for engineering construction drilling, and has large caliber and large depth. The large spiral drill rod consists of a solid shaft or a hollow pipe and spiral blades welded on the outer side of the solid shaft or the hollow pipe one by one and formed by pressing, and the drill rods are connected by penetrating pins. According to the invention, a large auger with water impact is adopted, a fireproof sleeve is not required to be additionally arranged, and the special spiral slices with uneven surfaces are used for increasing friction and being matched with the water impact to better discharge pulverized coal so as to enable the coal to form a cavity. The formation of the cavity reduces the coal resistance and avoids the drilling risk caused by the increase of drilling depth, torque and stress of the drilling tool.
S6: as shown in fig. 7, the screen 5 continues the extension process. The process adopts the heel tube impact drilling technology, continues to drill forward with the screen pipe 5, and continues to drill L through the cavity 8 formed in the step S4 2 After the length, the drilling process is again not continued by friction.
S7: and (4) repeating the steps S4-S6 until drilling to the final hole position, plugging the drilled holes, and extracting the coal seam gas.
Specifically, the impact process is refilled. Since the screen 5 is blocked again from advancing, the operation S4 is performed again to water impact the coal body.
And (5) a large spiral re-drilling process. And drilling the coal seam by using the large-diameter spiral drilling machine again to form a second section of cavity 8.
The screen 5 continues the extension process. The drilling forward with the screen 5 continues through the second section cavity 8 formed. While continuing to drill L 3 After the length, the coal body collapses in the drilling process, and the drilling process cannot be continued again under the action of friction force.
The formation of the cavity reduces the coal resistance and avoids the drilling risk caused by the increase of drilling depth, torque and stress of the drilling tool. Drilling process A 1 The distance then reaches a predetermined position, i.e. the limit length that the screen 5 can reach.
The drilling process continues. And selecting a screen pipe 5 with a proper diameter, and repeating the operations of the steps S4-S6 until the drilling width D cannot support the drilling tool to perform drilling activities.
And (5) a gas extraction process. And after the drilling process is finished, plugging the drilling hole by adopting a hole sealing process of two plugs and one injection, and extracting coal seam gas by using an air pump 9.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the 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 scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. A soft coal seam heel tube impact and large spiral alternative shield drilling and gas control method is characterized by comprising the following steps:
s1: drilling in the rock stratum (1) by adopting a heel pipe impact drilling mode, and leaving the casing (4) in the rock stratum (1) for supporting;
s2: changing the casing (4) into a screen pipe (5), and drilling by adopting a pipe-following impact drilling mode until the drilling tool (3) penetrates through the rock stratum (1);
s3: continuing to drill forward in the coal seam (2) until the friction between the sieve tube (5) and the coal body is increased until the drilling process cannot be continued;
s4: the plugging block (6) is sent into the screen pipe (5), after the plugging block reaches the position, the screen pipe (5) is plugged through the air charging or water filling operation by the guide pipe, then water injection is carried out by the water injection pipe to start water impact, and the pulverized coal flows from the high pressure area to the low pressure area of the screen pipe (5) along with water flow when being impacted by water;
s5: after the water impact is finished, carrying out air leakage or water drainage operation to take out the sealing plug (6) from the screen pipe (5), then drilling, and conveying pulverized coal out of the drilled holes, so that a cavity (8) is formed in the drilling process of the coal bed (2);
s6: adopting a heel pipe impact drilling technology, continuing to drill forwards with the screen pipe (5), and continuing to drill until the drilling cannot be continued again through the cavity (8) formed in the step S4;
s7: and (4) repeating the steps S4-S6 until drilling to the final hole position, plugging the drilled holes, and extracting the coal seam gas.
2. The method for alternately shielding drilling and gas control by soft coal seam heel tube impact and large spiral according to claim 1, wherein the diameter of the sleeve (4) is larger than the diameter of the screen pipe (5).
3. The method for alternately shielding drilling and gas control by soft coal seam heel tube impact and large spiral according to claim 1, wherein in the step S1, when the distance between the drilling tool (3) and the coal seam (2) is S 1 Stopping drilling at the time S 1 ≥0.2m。
4. The method for alternately shielding drilling and gas management by using soft coal seam heel tube impact and large spiral according to claim 1, wherein the plugging plug (6) comprises a front plugging capsule (11) and a rear plugging capsule (11), the plugging capsules (11) at the rear side are fixed with a water injection pipe (12), the two plugging capsules (11) are connected through a connecting rod (10), and the two plugging capsules (11) are connected with a guide pipe (13) for inflation and deflation or water filling and drainage operations.
5. The method for alternately drilling and gas control by pipe-following impact and large spiral of soft coal seam according to claim 4, wherein in the step S4, the water injection process is that the water injection is started to perform water impact on the coal body after the screen pipe is blocked by the blocking capsule, and the blocking capsule (6) performs the operations of inflating and deflating or water filling and draining through the guide pipe (13) so as to enable the blocking capsule to move, fix or be taken out of the screen pipe.
6. The method for alternately shielding drilling and gas control by using soft coal seam heel tube impact and large spiral according to claim 1, wherein the length of the hollow cavity (8) in the step S5 is less than or equal to 0.5m.
7. The method for alternately drilling with large spiral shield and controlling gas according to claim 1, wherein in the step S7, the diameter of the screen pipe (5) used is gradually reduced each time the steps S4 to S6 are repeated.
8. The method for alternately shielding drilling and gas management with pipe impact and large spiral of soft coal seam according to claim 7, wherein in step S7, the drilling of the drill holes to the diameter of the screen pipe (5) cannot support the drilling operation of the drilling tool.
9. The method for alternately drilling with large spiral and shielded gas control according to claim 7, wherein in step S5, the large spiral drill rod (7) is used to drill the coal body through the casing (4) in the rock layer (1) and the screen pipe (5) in the coal layer (2) by adopting a large-diameter spiral drilling mode.
10. The method for alternately shielding drilling and gas control by soft coal seam heel tube impact and large spiral according to claim 9, wherein the large spiral drill rod (7) utilizes special spiral slices with uneven surfaces to increase friction and match with water impact to better discharge pulverized coal so that a coal body is easier to form a cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311182716.3A CN117145382A (en) | 2023-09-14 | 2023-09-14 | Soft coal seam heel tube impact and large spiral alternate shield drilling and gas control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311182716.3A CN117145382A (en) | 2023-09-14 | 2023-09-14 | Soft coal seam heel tube impact and large spiral alternate shield drilling and gas control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117145382A true CN117145382A (en) | 2023-12-01 |
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