CN111894477A - Outburst coal seam hole protection and pressure relief combined drilling tool and using method thereof - Google Patents
Outburst coal seam hole protection and pressure relief combined drilling tool and using method thereof Download PDFInfo
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- CN111894477A CN111894477A CN202010648997.7A CN202010648997A CN111894477A CN 111894477 A CN111894477 A CN 111894477A CN 202010648997 A CN202010648997 A CN 202010648997A CN 111894477 A CN111894477 A CN 111894477A
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- 238000005553 drilling Methods 0.000 title claims abstract description 175
- 239000003245 coal Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000011148 porous material Substances 0.000 claims abstract description 48
- 230000007704 transition Effects 0.000 claims abstract description 47
- 239000002893 slag Substances 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 238000007599 discharging Methods 0.000 claims description 19
- 206010066054 Dysmorphism Diseases 0.000 claims description 11
- 238000004401 flow injection analysis Methods 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- 230000004323 axial length Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002817 coal dust Substances 0.000 abstract description 4
- 230000002633 protecting effect Effects 0.000 abstract description 4
- 239000011435 rock Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
-
- 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
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
-
- 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
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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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
- 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)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a hole-protecting and pressure-relieving combined drilling tool for a protruded coal seam and a use method thereof. According to the combined drilling tool, the spiral groove sieve pore drilling rod and the special-shaped grooving drilling rod are adopted, the special drill bit and the transition lap joint device are arranged to form the combined drilling tool, a good hole protecting and pressure relieving effect can be achieved in the drilling operation process, gas and coal dust at the position of a drilling hole can be collected conveniently, the structure combination is convenient, and the flexibility of the drilling operation is improved.
Description
Technical Field
The invention belongs to the technical field of coal mine gas extraction drilling, and particularly relates to a hole protection and pressure relief combined drilling tool for a outburst coal seam and a using method thereof.
Background
The drilling of the soft coal seam and the outburst coal seam has the problems of difficult drilling and deslagging, low drilling efficiency, shallow drilling depth, low hole forming rate, poor hole forming effect and the like, and directly influences the drilling and sealing quality and the gas extraction efficiency.
The drill rods commonly used for drilling coal mines at present comprise a spiral (low-spiral) drill rod, a triangular drill rod, a smooth drill rod, a special-shaped section drill rod, a double-channel hole-protecting drill rod and the like, and each drill rod has self application conditions and advantages and disadvantages.
In the existing underground drilling process, a single type of drill rod is often used for drilling, so that the method cannot be suitable for complicated and variable geological conditions, and cannot better exert the advantages of the drill rod.
When the outburst coal seam is drilled, the gas pressure of the coal body is high, the free surface near the newly exposed coal body at the bottom of a drill hole is suddenly increased in the drilling process, the gas emission amount is large, the coal body at the bottom of the drill hole is volatile and stable to damage under the combined action of ground stress, gas pressure, drilling disturbance and the like, the hole spraying phenomenon is frequent, and the hole protection, the slag discharging and the gas collection at the hole opening of the coal seam cannot be realized by using a single type drilling tool on the premise of considering the cost.
The invention patent of China (publication number: CN 101566049B) discloses a special-shaped multi-edge grooving drill rod, which consists of a hollow multi-edge prism and a connecting piece, wherein the outer contour of the cross section of the multi-edge prism consists of a straight line section and an arc section, and discontinuous spiral grooves are distributed on the surface of a rod body. The invention has simple processing, low cost and large slag discharge area, but has small contact area with the wall of the drill hole and poor hole protection effect on the wall of the drill hole.
The invention discloses a hole-protecting pressure-releasing internal slag-discharging drill rod (No. CN 108505955B), which comprises a hollow rod body, a flow injection pipe coaxially arranged in the rod body, and a support member for connecting the rod body and the flow injection pipe, wherein a slag-discharging channel is arranged between the inner wall of the rod body and the outer wall of the flow injection pipe, an air inlet channel and a water inlet channel are arranged in the flow injection pipe, the direction opposite to the rotating direction of the drill rod body during drilling is taken as the reverse direction, a spiral groove which ascends along the reverse direction in a cylindrical spiral shape is arranged on the outer cylindrical surface of the rod body, and a plurality of pressure-releasing holes communicated with the cavity in the. The drill rod is high in cost, and the problems that gas and coal dust at the position of a drill hole are difficult to collect and the like exist.
In addition, most of the drill rods are used independently, and the advantages of each drill rod cannot be better played because the drill rods are not used in combination with the advantages of the drill rods.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the hole-protecting and pressure-releasing combined drilling tool for the outburst coal seam and the using method thereof, which realize better hole-protecting and pressure-releasing in the drilling operation process, are convenient for collecting gas and coal dust at the position of a drilling hole, are convenient for structure combination, and improve the flexibility of the drilling operation.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an outstanding coal seam hole protection release combination drilling tool, includes helicla flute sieve mesh drilling rod and dysmorphism grooving drilling rod, still includes special drill bit and transition bridging device, special drill bit is connected with helicla flute sieve mesh drilling rod, transition bridging device one end is connected with helicla flute sieve mesh drilling rod, and the other end is connected with dysmorphism grooving drilling rod, special drill bit, transition bridging device, helicla flute sieve mesh drilling rod and the coaxial distribution of dysmorphism grooving drilling rod.
Further, helicla flute sieve mesh drilling rod include I type helicla flute sieve mesh drilling rod and II type helicla flute sieve mesh drilling rods, be equipped with the external screw thread on the outer cylinder face of I type helicla flute sieve mesh drilling rod tip, be equipped with the internal thread on the inner cylinder face of another tip, all be equipped with the internal thread on the inner cylinder face in both ends of II type helicla flute sieve mesh drilling rods, I type helicla flute sieve mesh drilling rod and II type helicla flute sieve mesh drilling rod pass through interior thread connection.
The special drill bit include and bear cover and a plurality of cutting edge, bear the cover and be the cylinder, and be equipped with central through-hole, bear the side of cover and evenly seted up a plurality of water conservancy diversion recess along its axial, form the water conservancy diversion convex body between adjacent water conservancy diversion recess, be equipped with on the water conservancy diversion convex body with the internal thread complex screw thread section of II type helicla flute sieve mesh drilling rods, the cutting edge sets up in a tip of each water conservancy diversion convex body and the central through-hole department of homonymy, is equipped with the jet orifice on the cutting edge.
Further, the outer diameter of the special drill bit is 5mm-25mm larger than that of the spiral groove sieve pore drill rod.
The transition overlap joint device include the coupling pipe section, bear pipeline section and transition water conservancy diversion way, coupling pipe section and the coaxial setting of bearing pipe section and formula structure as an organic whole, the transition water conservancy diversion way inlays in coupling pipe section and bearing pipe section to rather than coaxial setting, a plurality of connecting groove has been seted up along its axial to the coupling pipe section side, forms the connection convex body between the adjacent connecting groove, be equipped with on the connection convex body with I type helicla flute sieve mesh drilling rod thread section of screw-thread fit, bearing pipe section side is equipped with along its axial bears the weight of the recess, bears recess axial one end and connecting groove connection, the other end is located the side of bearing the pipeline section, connecting groove and bearing groove formation transition slag removal passageway.
The sliding sleeve and the limiting convex body arranged on the side face, far away from the end part of the connecting pipe section, of the bearing pipe section form limiting fit, the sliding sleeve keeps the transitional slag discharging channel smooth when the drill is forwards drilled, and the transitional slag discharging channel is kept closed when the drill is backwards drilled after the drilling is finished.
Furthermore, the transition slag discharging channels are symmetrically arranged by taking the axial direction of the transition lapping device as a center.
Further, the axial length of the bearing groove is 1/4-1/2 of the length of the bearing pipe section.
Type II helicla flute sieve mesh drilling rods set up to one, type I helicla flute sieve mesh drilling rods set up to a plurality of, adjacent type I helicla flute sieve mesh drilling rods are through external screw thread connection in it, dysmorphism grooving drilling rod set up to a plurality of, adjacent dysmorphism grooving drilling rod is through external screw thread connection in it.
The use method of the outburst coal seam hole-protecting pressure-relieving combined drilling tool comprises the following steps:
step 1: drilling and reaming at the position of the open pore by using a special-shaped grooving drill rod and a large-diameter drill bit;
step 2: installing an orifice dust removal device at the orifice after reaming;
and step 3: determining the number of I-type spiral groove sieve pore drill rods and special-shaped grooved drill rods which meet the use requirement according to the drilling operation requirement;
and 4, step 4: connecting a certain number of I-shaped spiral groove sieve pore drill rods through the matching of internal threads and external threads, connecting a certain number of special-shaped grooved drill rods through the internal threads and the external threads, and assembling a transition lapping device and a sliding sleeve;
and 5: connecting one end of a II-type spiral groove sieve pore drilling rod with a special drill bit in a threaded manner, connecting the other end of the II-type spiral groove sieve pore drilling rod with the external thread of the I-type spiral groove sieve pore drilling rod after matching, and connecting a transition lap joint device with the internal thread of the I-type spiral groove sieve pore drilling rod after matching, so that a central through hole of the special drill bit is communicated with a flow injection pipe in the I-type spiral groove sieve pore drilling rod;
step 6: one end of the special-shaped grooved drill rod is in threaded connection with the transition lapping device, and the other end of the special-shaped grooved drill rod is connected with drilling equipment, so that a flow guide cavity in the special-shaped grooved drill rod is communicated with an external high-pressure medium source, and the assembly of the combined drilling tool is completed;
and 7: driving the drilling equipment and an external high pressure medium source;
and 8: the drill bushing equipment drives the drilling tool to rotate to carry out drilling operation, an external high-pressure medium source sequentially passes through a flow guide cavity, a transition flow guide channel and a flow injection pipe in the special-shaped grooved drilling rod and finally flows to a construction operation surface of the drilling tool through a jet hole in the drilling tool, cooling and cooling of the drilling tool operation are achieved, and chips in the drilling tool are driven to carry out chip removal and pressure release operation along the axis of the drilling tool.
The invention achieves the following beneficial effects:
(1) according to the combined drilling tool, the spiral groove sieve pore drilling rod and the special-shaped grooving drilling rod are adopted, and the special drill bit and the transition lapping device are arranged to form the combined drilling tool, so that a good hole protecting and pressure relieving effect can be achieved in the drilling operation process, the collection of gas and coal dust at a drilling hole is facilitated, the structural combination is convenient, and the flexibility of the drilling operation is improved;
(2) the transitional slag discharging channel is arranged on the side surface of the transitional lapping device, so that the hole protecting effect on the wall of a drilling hole can be ensured, and the slag discharging capability of the combined drilling tool in use is improved;
(3) the transitional slag discharging channel is symmetrically arranged by taking the axial direction of the adapter as a center, and the stability of hole protection on the wall of a drilling hole is improved on the basis of increasing the slag discharging channel.
Drawings
FIG. 1 is a schematic structural view of an I-type spiral groove sieve pore drill rod;
FIG. 2 is a schematic structural view of a II-type spiral groove sieve pore drill rod;
FIG. 3 is a schematic view of a combination drill configuration;
FIG. 4 is a schematic view of a special drill bit;
FIG. 5 is a front view of FIG. 4;
FIG. 6 is a schematic view of a transition lap joint apparatus;
FIG. 7 is a front view of FIG. 6;
FIG. 8 is a cross-sectional view taken along direction A of FIG. 7;
FIG. 9 is a schematic structural view of the sliding sleeve;
FIG. 10 is a front view of FIG. 9;
FIG. 11 is a schematic view of the assembly of the sliding sleeve with the transition lap joint apparatus during forward drilling;
FIG. 12 is a schematic view of the assembly of the sliding sleeve and the transition overlapping device during the withdrawal of the drill.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure. In addition, the terms such as "upper", "lower", "left", "right", "front", "rear", "middle" and "one" used in the present specification are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship may be made without substantial technical changes.
Referring to fig. 1 to 12, a protruded coal seam hole-protecting and pressure-relieving combined drilling tool comprises a spiral groove sieve pore drilling rod and a special-shaped grooved drilling rod, wherein the spiral groove sieve pore drilling rod comprises an I-type spiral groove sieve pore drilling rod 1 and a II-type spiral groove sieve pore drilling rod 2, an external thread is arranged on the outer cylindrical surface of one end part of the I-type spiral groove sieve pore drilling rod 1, an internal thread is arranged on the inner cylindrical surface of the other end part, internal threads are arranged on the inner cylindrical surfaces of the two end parts of the II-type spiral groove sieve pore drilling rod 2, the specific structure of the I-type spiral groove sieve pore drilling rod 1 is, no longer elaborating here, I type helicla flute sieve mesh drilling rod is compared to II type helicla flute sieve mesh drilling rod, and the difference is exactly that the external screw thread with I type helicla flute sieve mesh drilling rod one end sets up to the internal thread, and all the other structures are the same, here, and its specific structure is no longer repeated.
The special-shaped grooving drill rod 5 comprises a prismatic grooving drill rod and a special-shaped section drill rod, wherein the prismatic grooving drill rod comprises a special-shaped triangular grooving drill rod, a special-shaped four-prismatic grooving drill rod, a triangular grooving drill rod and a four-prismatic grooving drill rod, and the prismatic grooving drill rod and the special-shaped section drill rod are prior art in the field and are not elaborated in detail herein.
Still include special drill bit 3 and transition bridging device 4, the internal thread threaded connection of special drill bit 3 and II type helicla flute sieve mesh drilling rod 2, 4 one end of transition bridging device and the internal thread threaded connection of I type helicla flute sieve mesh drilling rod 1, the other end and 5 threaded connection of dysmorphism grooving drilling rod, special drill bit 3, transition bridging device 4, I type helicla flute sieve mesh drilling rod 1, II type helicla flute sieve mesh drilling rod 2 and the coaxial distribution of dysmorphism grooving drilling rod 5.
Further, the special drill 3 include bearing sleeve 31 and a plurality of cutting edge 32, bearing sleeve 31 is the cylinder, and is equipped with central through hole 311, preferably, the internal diameter of central through hole 311 and the injection pipe adoption cooperation of pegging graft mode in II type helicla flute mesh drilling rod 2 use, and the injection pipe connects and inserts in central through hole 311, and a plurality of water conservancy diversion recess 312 has evenly been seted up along its axial in the side of bearing sleeve 31, forms water conservancy diversion convex body 313 between adjacent water conservancy diversion recess 312, be equipped with on the water conservancy diversion convex body 313 with II type helicla flute mesh drilling rod 2's interior screw thread fit's screw thread section, cutting edge 32 sets up in the central through hole 311 department of a tip and the homonymy of each water conservancy diversion convex body 313, is equipped with jet hole 321 on cutting edge 32, in this embodiment.
Preferably, the outer diameter of the special drill bit 3 is 5mm-25mm larger than the outer diameter of the spiral groove sieve pore drill rod, so that a yielding gap is formed in an annular gap between the wall of a drill hole and the outer diameter of the drill rod, the drill hole surrounding rock is borne to be subjected to limited deformation, and the deep surrounding rock bearing capacity is exerted; the outer surface of the drill rod controls the transitional deformation of the drill hole wall to cause the unstable collapse and damage of the drill hole wall, so that the purpose of protecting the hole is achieved; the pressure yielding clearance is controlled by the diameter of a special drill bit and a drill rod, and specific numerical values need to be reasonably selected according to coal seam gas pressure, ground stress, unstable failure characteristics of a drill hole, torque of a drilling machine, friction torque of the drill rod and the wall of the drill hole and the like.
Preferably, the cross-section of the connecting groove 411 is in a circular arc or "" groove-shaped structure.
Preferably, the straight line of the bottom surface of the bearing groove 421 forms an angle of 15-60 degrees with the axial direction of the bearing pipe section 42, so that the bearing groove 421 can play a role in discharging slag outwards.
Further, in order to improve the stability of hole protection on the wall of the drilled hole, the transitional slag discharging channels are symmetrically arranged by taking the axial direction of the transitional lapping device 4 as the center.
Still establish the sliding sleeve 6 on transition overlap joint device 4 including the cover, sliding sleeve 6 and bearing pipe section 42 keep away from the spacing convex body 422 that connecting pipe section 41 tip side set up and form spacing cooperation, sliding sleeve 6 keeps transition slag discharging channel unblocked when drilling forward, and the completion of drilling keeps transition slag discharging channel closed when moving back the drilling backward, prevents to move back outward and bores the cinder and get into spiral groove sieve mesh drilling rod inner passage from slag discharging channel when stopping pressing the wind, blocks up the drilling rod, and at this in-process, the power that sliding sleeve 6 removed derives from the frictional force that the drilling wall gave the sliding sleeve.
Preferably, in order to ensure the sliding sleeve 6 to smoothly open and close the transitional slag discharging channel on the transitional overlapping device, the axial length of the bearing groove 421 is 1/4-1/2 of the length of the bearing pipe section 42.
Further, II type helicla flute sieve mesh drilling rods 2 set up to one, I type helicla flute sieve mesh drilling rod 1 sets up to a plurality of, adjacent I type helicla flute sieve mesh drilling rod 1 is through external screw thread connection in it, dysmorphism grooving drilling rod 5 set up to a plurality of, adjacent dysmorphism grooving drilling rod 5 is through external screw thread connection in it.
The use method of the outburst coal seam hole-protecting pressure-relieving combined drilling tool comprises the following steps:
step 1: drilling and reaming at the position of the open pore by using a special-shaped grooving drill rod and a large-diameter drill bit;
step 2: installing an orifice dust removal device at the orifice after reaming;
and step 3: according to the drilling operation requirement, the number of the I-type spiral groove sieve pore drill rods 1 and the number of the special-shaped grooving drill rods 5 which meet the use requirement are determined, in the embodiment, the number of the I-type spiral groove sieve pore drill rods 1 and the number of the special-shaped grooving drill rods 5 are both set to be 1;
and 4, step 4: assembling the transition lapping device 4 and the sliding sleeve 6;
and 5: connecting one end of a II-type spiral groove sieve pore drill rod 2 with a special drill bit in a threaded manner, connecting the other end of the II-type spiral groove sieve pore drill rod 2 with the external thread of an I-type spiral groove sieve pore drill rod 1, and connecting a transition lap joint device with the internal thread of the I-type spiral groove sieve pore drill rod 1 so as to enable a central through hole 311 of a special drill bit 3 to be communicated with a flow injection pipe in the I-type spiral groove sieve pore drill rod 1;
step 6: one end of a special-shaped grooved drill rod 5 is in threaded connection with the transition lapping device 4, and the other end of the special-shaped grooved drill rod is connected with drilling equipment, so that a flow guide cavity in the special-shaped grooved drill rod 5 is communicated with an external high-pressure medium source, and the assembly of the combined drilling tool is completed;
and 7: driving the drilling equipment and an external high pressure medium source;
and 8: the drill bushing equipment drives the drilling tool to rotate to carry out drilling operation, an external high-pressure medium source sequentially passes through a flow guide cavity in the special-shaped grooved drill rod 5, a transition flow guide channel 43 of the transition lap joint device 4 and the flow injection pipes of the I-type spiral groove sieve pore drill rod 1 and the II-type spiral groove sieve pore drill rod 2, and finally flows onto a construction operation surface of the drilling tool through a jet hole 321 on a special drilling bit, so that cooling and cooling of the drilling tool operation are realized, and chips in the drilling tool are driven to carry out chip removal and pressure relief operation along the axis of the drilling tool.
In order to ensure smooth slag discharge during drilling operation, the total amount of the discharged slag of the combined drill rod is more than or equal to 1.5 times of the drilling slag yield of the special drill bit 3, wherein the slag yield refers to the amount of forward coal rock breaking of the drill bit in unit time, and the slag discharge refers to the amount of coal rock fragments discharged from the damping drill rod section through fluid and the spiral groove in unit time.
During chip removal and gas pressure relief operation, the contact surface of the outer side surface of the spiral groove sieve pore drill rod and the transition lap joint device and the wall of the drill hole supports the wall of the drill hole, then chips in the drill hole are mixed with a high-pressure medium sprayed by the drill bit and gas generated in the drill hole, and a part of mixture is discharged from the drill hole through a flow guide groove on the outer surface of the spiral groove sieve pore drill rod; and the other part of the mixture seeps to a position between the rod body of the spiral groove sieve pore drill rod and the injection pipe through the flow guide holes of the spiral groove sieve pore drill rod, flows from front to back along the axis of the spiral groove sieve pore drill rod, and is finally discharged through the transition flow guide channel and discharged along the flow guide cavity of the special-shaped grooved drill rod for chip removal and pressure relief.
The technical solutions of the present invention are further described and explained in the above with reference to the specific implementation processes, but the protection scope is not limited thereto. All equivalent modifications and variations that do not depart from the spirit and scope of the invention should be deemed to be covered by the appended claims.
Claims (10)
1. The utility model provides a prominent coal seam hole protection release combination drilling tool, includes helicla flute sieve mesh drilling rod and special-shaped grooving drilling rod, its characterized in that: the special drill bit is connected with the spiral groove sieve pore drill rod, one end of the transition lapping device is connected with the spiral groove sieve pore drill rod, the other end of the transition lapping device is connected with the special-shaped groove drill rod, and the special drill bit, the transition lapping device, the spiral groove sieve pore drill rod and the special-shaped groove drill rod are coaxially distributed.
2. The outburst coal seam hole-protecting and pressure-relieving combined drilling tool according to claim 1, characterized in that: the helicla flute sieve mesh drilling rod include I type helicla flute sieve mesh drilling rod and II type helicla flute sieve mesh drilling rod, be equipped with the external screw thread on the outer cylinder face of I type helicla flute sieve mesh drilling rod tip, be equipped with the internal thread on the inner cylinder face of another tip, all be equipped with the internal thread on the inner cylinder face in both ends of II type helicla flute sieve mesh drilling rod, I type helicla flute sieve mesh drilling rod and II type helicla flute sieve mesh drilling rod pass through interior thread connection.
3. The outburst coal seam hole-protecting and pressure-relieving combined drilling tool according to claim 2, wherein: the special drill bit include and bear cover and a plurality of cutting edge, bear the cover and be the cylinder, and be equipped with central through-hole, bear the side of cover and evenly seted up a plurality of water conservancy diversion recess along its axial, form the water conservancy diversion convex body between adjacent water conservancy diversion recess, be equipped with on the water conservancy diversion convex body with the internal thread complex screw thread section of II type helicla flute sieve mesh drilling rods, the cutting edge sets up in a tip of each water conservancy diversion convex body and the central through-hole department of homonymy, is equipped with the jet orifice on the cutting edge.
4. The outburst coal seam hole-protecting and pressure-relieving combined drilling tool according to claim 2, wherein: the outer diameter of the special drill bit is 5mm-25mm larger than that of the spiral groove sieve pore drill rod.
5. The protruding coal seam hole-protecting and pressure-relieving combined drilling tool according to any one of claims 2 to 4, wherein: the transition overlap joint device include the coupling pipe section, bear pipeline section and transition water conservancy diversion way, coupling pipe section and the coaxial setting of bearing pipe section and formula structure as an organic whole, the transition water conservancy diversion way inlays in coupling pipe section and bearing pipe section to rather than coaxial setting, a plurality of connecting groove has been seted up along its axial to the coupling pipe section side, forms the connection convex body between the adjacent connecting groove, be equipped with on the connection convex body with I type helicla flute sieve mesh drilling rod thread section of screw-thread fit, bearing pipe section side is equipped with along its axial bears the weight of the recess, bears recess axial one end and connecting groove connection, the other end is located the side of bearing the pipeline section, connecting groove and bearing groove formation transition slag removal passageway.
6. The outburst coal seam hole-protecting and pressure-relieving combined drilling tool according to claim 5, wherein: the sliding sleeve and the limiting convex body arranged on the side face, far away from the end part of the connecting pipe section, of the bearing pipe section form limiting fit, the sliding sleeve keeps the transitional slag discharging channel smooth when the drill is forwards drilled, and the transitional slag discharging channel is kept closed when the drill is backwards drilled after the drilling is finished.
7. The outburst coal seam hole-protecting and pressure-relieving combined drilling tool according to claim 5, wherein: the transition slag discharging channels are symmetrically arranged by taking the axial direction of the transition lapping device as a center.
8. The outburst coal seam hole-protecting and pressure-relieving combined drilling tool according to claim 5, wherein: the axial length of the bearing groove is 1/4-1/2 of the length of the bearing pipe section.
9. The protruding coal seam hole-protecting and pressure-relieving combined drilling tool according to any one of claims 6 to 8, wherein: type II helicla flute sieve mesh drilling rods set up to one, type I helicla flute sieve mesh drilling rods set up to a plurality of, adjacent type I helicla flute sieve mesh drilling rods are through external screw thread connection in it, dysmorphism grooving drilling rod set up to a plurality of, adjacent dysmorphism grooving drilling rod is through external screw thread connection in it.
10. The use method of the outburst coal seam hole-protecting pressure-relieving combined drilling tool, which adopts the combined drilling tool according to claim 9, and is characterized in that: the method comprises the following steps:
step 1: drilling and reaming at the position of the open pore by using a special-shaped grooving drill rod and a large-diameter drill bit;
step 2: installing an orifice dust removal device at the orifice after reaming;
and step 3: determining the number of I-type spiral groove sieve pore drill rods and special-shaped grooved drill rods which meet the use requirement according to the drilling operation requirement;
and 4, step 4: connecting a certain number of I-shaped spiral groove sieve pore drill rods through the matching of internal threads and external threads, connecting a certain number of special-shaped grooved drill rods through the internal threads and the external threads, and assembling a transition lapping device and a sliding sleeve;
and 5: connecting one end of a II-type spiral groove sieve pore drilling rod with a special drill bit in a threaded manner, connecting the other end of the II-type spiral groove sieve pore drilling rod with the external thread of the I-type spiral groove sieve pore drilling rod after matching, and connecting a transition lap joint device with the internal thread of the I-type spiral groove sieve pore drilling rod after matching, so that a central through hole of the special drill bit is communicated with a flow injection pipe in the I-type spiral groove sieve pore drilling rod;
step 6: one end of the special-shaped grooved drill rod is in threaded connection with the transition lapping device, and the other end of the special-shaped grooved drill rod is connected with drilling equipment, so that a flow guide cavity in the special-shaped grooved drill rod is communicated with an external high-pressure medium source, and the assembly of the combined drilling tool is completed;
and 7: driving the drilling equipment and an external high pressure medium source;
and 8: the drill bushing equipment drives the drilling tool to rotate to carry out drilling operation, an external high-pressure medium source sequentially passes through a flow guide cavity, a transition flow guide channel and a flow injection pipe in the special-shaped grooved drilling rod and finally flows to a construction operation surface of the drilling tool through a jet hole in the drilling tool, cooling and cooling of the drilling tool operation are achieved, and chips in the drilling tool are driven to carry out chip removal and pressure release operation along the axis of the drilling tool.
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