CN110306934A - The construction method and supporting drilling tool of double branch's top plate major diameter high position directional long boreholes - Google Patents
The construction method and supporting drilling tool of double branch's top plate major diameter high position directional long boreholes Download PDFInfo
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- CN110306934A CN110306934A CN201910589446.5A CN201910589446A CN110306934A CN 110306934 A CN110306934 A CN 110306934A CN 201910589446 A CN201910589446 A CN 201910589446A CN 110306934 A CN110306934 A CN 110306934A
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- 238000005553 drilling Methods 0.000 title claims abstract description 100
- 238000010276 construction Methods 0.000 title claims abstract description 40
- 230000035515 penetration Effects 0.000 claims abstract description 59
- 238000000605 extraction Methods 0.000 claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 29
- 239000003245 coal Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000003247 decreasing effect Effects 0.000 claims abstract description 9
- 239000007787 solid Substances 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims abstract description 5
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims description 27
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 21
- 239000002131 composite material Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000005065 mining Methods 0.000 abstract description 5
- 230000000295 complement effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000013011 mating Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000007704 transition Effects 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
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
- E21B10/55—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits with preformed cutting elements
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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
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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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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Abstract
A kind of construction method and supporting drilling tool of double branch's top plate major diameter high position directional long boreholes, the directional long borehole includes sealing of hole casing section, strata penetration hole section and double branch's extraction hole sections, and the strata penetration hole section includes the S-shaped profile footprint section between working face coal seam and roof fracture band.Method is sealing of hole casing section of first constructing, down tube solid hole；Then construction strata penetration hole section and top set bore the minor diameter pilot hole of reaming and bore enlarged diameter hole；Then enlarged diameter hole is simultaneously bored in sidetracking, Qiang Kai minor diameter branch in the S-shaped profile footprint section of major diameter strata penetration hole section, construction guidance hole.The number of openings can be greatly decreased in the present invention, reduce complementary project amount, improve integrated construction efficiency and High Position Drilling utilization rate, be conducive to improve pressure relief gas pumping mining effect.Matched drill bit is equipped with sidetracking branch column tooth, can impact under the effect of gravity-cutting-up large diameter hole on the downside of hole wall, quickly make step, hanging sidetracking minor diameter branch, it is consistent with conventional lead bit function during directional drilling.
Description
Technical field
The present invention relates to the construction methods and supporting drilling tool of a kind of double branch's top plate major diameter high position directional long boreholes, especially
Relate to the use of large diameter hole ideal hole wall section circle minor diameter sidetracking branch drill bit desired cut circle between curvature difference, by
Sidetracking branch drill bit hanging sidetracking, the strong double branches for opening minor diameter oriented branch hole and reaming in the large diameter hole after reaming
The construction method and supporting drilling tool of top plate major diameter high position directional long borehole.
Background technique
The mine for exploiting single coal bed and coal seam group, during working face extraction, this coal seam, adjacent layer release are largely unloaded
Gas is pressed, these gas will gather in work face goaf, upper corner and roof fracture band, in the distinguished and admirable pressure oscillation shadow in the face of adopting
Under sound, easily gush out and return aircourse, gas at upper corner is caused to be transfinited, seriously threatens shaft production safety, restricts mine volume increase
Synergy.
Top plate major diameter high position directional long borehole be carry out working face adopt pressure relief gas pumping mining desirable technique means it
One, by arranging drill site in coal road, surrounded using measurement while-drilling instrument system, mating directional technology equipment control drilling trajectory
Planned course drilling faces upward and enters estimated mining induced fissure band and concordant extension across Roof Rock Strata of Coal Seam.Top plate major diameter is high
It is obvious that position directional long borehole extraction working face adopts gas pressure relief potential advantages: compared with conventional High Position Drilling, in destination layer
Effective extended distance is long, layer position is controllable, and utilization rate is high, and space cloth pitch of holes is uniform, and drilling hole amount is few；It is high compared with suction road
Position directional long borehole is constructed in coal road, and drill site flexible arrangement, the back works amount such as driving, supporting is few, short construction period, comprehensive
It is at low cost.
Currently, top plate high position directional drilling extraction working face is adopted gas pressure relief technology and quickly grown, and has and gradually substitute
The trend of suction road.However, due to being matched by underground coal mine directional drilling machine ability, mating slush pump (vehicle) discharge capacity, drilling tool restricted class,
The many factors such as drilling rod intensity limitation, top plate high position major diameter (>=Φ 153mm) directional drilling can only take " orientation pilot hole+
The method pore-forming of reaming " (i.e. " Kong Yikuo "), the cloth hole in the form of the group that drills, i.e., first directional drilling minor diameter (≤Φ 120mm)
Pilot hole to predetermined design depth, mention brill replacement drilling tool after again to pilot hole carry out reaming, ultimately form major diameter (>=Φ
153mm) drainage holes, one group of (usual 5~10) hole of being constructed in a drill site with same method.Using " Kong Yikuo "
Method construction top plate major diameter high position directional drilling can only be drilled to the single extraction channel without branch, and laying drilling group, which exists, to open
Hole number is more, sealing of hole, setting of casing heavy workload, and the problems such as logical, hole quality is difficult to control easily is altered between hole.In addition, top plate is high-order
Directional long borehole can be subdivided into sealing of hole casing section as extraction channel, according to layer position relationship, extraction in strata penetration hole section and destination layer
Hole section three parts, wherein strata penetration hole section is connection, the changeover portion of effective extraction hole section and sealing of hole casing section in destination layer, is belonged to auxiliary
Helping property hole section is generally mostly faced upward with 10 °~30 ° of chance layer angle, tiltedly wears stratum between coal seam and target fissure zone, and it is special to have
Property: functionally, strata penetration hole section belongs to auxiliary extraction channel, and the fewer its drilling footage amount the better in principle；In terms of construction,
Strata penetration hole section has " Non-selectivity ", that is, has to pass through whole stratum between coal seam and target fissure zone；In terms of stabilization,
Strata penetration hole hole wall overall stability is poor, accordingly, there exist strata penetration hole hole wall easily collapse blocking channel, influence extracting result,
The problems such as subsequent guard aperture project amount is big.
For this purpose, designer of the invention is in view of drawbacks described above, it is comprehensive to be engaged in correlation for many years by concentrating on studies and designing
The experience and achievement of industry, researching and designing go out the construction method of a kind of double branch's top plate major diameter high position directional long boreholes and mating
Drilling tool, to overcome drawbacks described above.
Summary of the invention
The purpose of the present invention is to provide a kind of construction method of double branch's top plate major diameter high position directional long boreholes and match
Drilling tool is covered, the single extraction channel that can only be drilled to without branch can be effectively overcome in the prior art, when laying drilling group,
The number of openings is more, sealing of hole, lower orifice sleeve and later period guard aperture heavy workload, wears and easily alters logical, hole quality between interval hole and be difficult to control
The problems such as processed.
To solve the above problems, the invention discloses a kind of construction parties of double branch's top plate major diameter high position directional long boreholes
Method, double branch's top plate major diameter high position directional long boreholes are from working face coal seam drill site to the orientation of roof fracture belt construction
Long drilled holes, it includes 1 section of sealing of hole casing section, 1 section of strata penetration hole section and 2 sections of extraction hole section three parts, it is characterised in that:
The sealing of hole casing section is connected to the lower end of strata penetration hole section, 2 sections of drainage holes sections from working face coal seam drill site
In the upper end for being connected to strata penetration hole section in roof fracture band and in the form of double branches, the strata penetration hole section is included in working face coal
Layer roof fracture band between S-shaped profile footprint section, the S-shaped profile footprint section include inclination angle dullness increase section, inflection point and
Inclination angle monotone decreasing segment, double branch's extraction hole sections bore reaming under comprising the top set of Parallel Design and upper and lower layered arrangement
Reaming is bored by branch, and reaming is bored by the top set and strata penetration hole section is coaxially connected, and the inferior division bores reaming and is connected to S-shaped section rail
On the sidetracking branch point of mark inclination angle monotone decreasing segment；
The construction method are as follows: sealing of hole casing section of first constructing, down tube solid hole；Then construction strata penetration hole section and top set, which bore, expands
The minor diameter pilot hole of hole section, and bore expansion and form major diameter strata penetration hole section and top set's extraction hole section；Then layer is worn in major diameter
The hanging sidetracking inferior division of hole section S-shaped profile footprint latter end bores the minor diameter pilot hole of reaming section, and bores expansion and formed under major diameter
Branch's extraction hole section；Finally, forming double branches major diameter high position directional long borehole.
Wherein comprise the following steps:
Step 1: the brill for carrying out sealing of hole casing section from working face coal seam drill site expands construction, uses rotary drilling technique；
Step 2: the down tube solid hole of sealing of hole casing section is carried out；
Step 3: the minor diameter pilot hole for boring reaming to strata penetration hole section and top set carries out measurement while drilling directional drilling, institute
Strata penetration hole section is stated to creep into along S-shaped profile footprint；
Step 4: it carries out boring expansion and forms the strata penetration hole section and top set's brill reaming of major diameter, the brill expansion passes through replacement
Borehole-enlarging drilling tool combination, the pilot hole formed along step 3 are oriented reaming drilling, expand to bottom hole backed off after random borehole-enlarging drilling tool group
It closes；
Step 5: sidetracking point is selected on the monotone decreasing segment suitable position of major diameter strata penetration hole section S-shaped profile footprint inclination angle
Fulcrum, then tripping in is incorporated into branch point position with the directional tool of sidetracking branch drill bit, adjust the tool of deflecting drilling tool towards
Between 175 ° to 190 °, turn on pump inputs high pressure washing liquid drive hole bottom screw motor into hole and drives sidetracking branch drill bit on angle circle
Revolution sidetracking opens branch, realizes the lower part for entering roof fracture band after the interior sidetracking under hole wall of large diameter hole opens minor diameter branched hole
Layer position is oriented drilling, completes the pilot hole construction that inferior division bores reaming；
Step 6: carrying out brill expansion to the pilot hole of inferior division, and the inferior division for forming major diameter bores reaming, and the brill expansion passes through
Tripping in borehole-enlarging drilling tool is incorporated into branch point, and the inferior division pilot hole formed along step 5 is oriented reaming drilling, expands to hole
The combination of bottom backed off after random borehole-enlarging drilling tool.
Directional tool combination includes sidetracking branch drill bit used by the pilot hole that inferior division bores reaming is constructed, by sidetracking
Hole wall, the curvature difference based on different-diameter circular order quickly make platform on the downside of sidetracking branch column tooth impact cutting-up on branch's drill bit
Rank realizes that hanging sidetracking in the S-shaped profile footprint hole section of major diameter goes out branch's pilot hole of minor diameter.
A kind of supporting drilling tool of double branch's top plate major diameter high position directional long borehole construction methods is also disclosed, comprising special
Directional tool combination, it is characterised in that:
The particular orientation drill assembly include sidetracking branch drill bit, single bend PDM motor, measurement-while-drilling system, without magnetic bore
Tool and logical cable drill string, sidetracking branch drill bit include that four PDC cut the wing, and four PDC cutting wing 13 is in 90 ° of angles
Arrangement, the drill bit head periphery of the PDC cutting wing between any two are inlaid with a sidetracking branch column tooth, the sidetracking branch
Column tooth is pyramid shape cutting edge, the maximum cutting circle of the outer ring PDC composite sheet of the theoretical diameter and PDC cutting wing for sword of going out
Diameter is identical, so that sidetracking branch drill bit is identical as conventional lead bit function, and sidetracking branch column tooth is not in normal drilling process
It works；It is poor based on different circumferential curvatures in large diameter hole in the branching process of sidetracking minor diameter, with bit, sidetracking point
Pillar tooth successively, intermittently hole wall on the downside of impact cutting-up, gradually form step surface, secondary outer PDC composite sheet side cutting,
Realize hanging sidetracking, the straight branched hole of Qiang Kai little in the S-shaped profile footprint hole of major diameter, and can normal orientation drilling branch guiding
Hole.
Wherein: the sidetracking branch column tooth of sidetracking branch drill bit is embedded in the angle plane of symmetry position of two corresponding PDC cutting wings
It sets, and chisel edge is equipped at least two water holes, so that flushing liquor is cooling simultaneously after drill bit water hole is flowed out in drilling process
PDC composite sheet and sidetracking branch column tooth.
As can be seen from the above description, the construction method of double branch's top plate major diameter high position directional long boreholes of the invention and match
Set drilling tool has the effect that
1, the length for taking out hole section in mining induced fissure band can be effectively increased, it is public to realize double branches major diameter extraction hole section
Same strata penetration hole section, casing sealing section can reduce the number of openings 1/ in the case where guaranteeing equivalent amount drainage holes in destination layer
3~1/2, while the drilling workload of strata penetration hole section is greatly reduced, make the synthesis pore-forming of single drill site high position directional drilling group
20% or more cycle time.
2, under the premise of identical interfloor distance (the distance between coal seam and target fissure zone), double branch's top plate major diameters are high
The strata penetration hole section of position directional long borehole is conducive to shorten the floor projection length of invalid extraction hole section using S-shaped profile footprint, makes
The coverage area of extraction hole section increases by 10% or more；In addition, strata penetration hole section using S-shaped profile footprint increase eyelet and stratum it
Between angle, be conducive to improve wall stability, reduce collapsing etc. complex situations occurrence probability.
3, double branch's top plate major diameter high position directional long boreholes reduce the number of openings of single drilling holes at the drilling yard group, therefore,
The spacing that tapping point and strata penetration hole section can artificially be increased in identical scale drill site is advantageously used for drilling is reduced or avoided and wears layer
The generation of logical phenomenon is altered between hole section, improves hole quality.
4, double branch's top plate major diameter high position directional long borehole constructions realize big straight by special sidetracking branch drill bit
Sidetracking minor diameter pilot hole in diameter strata penetration hole section expands into major diameter drainage holes again；Based on major diameter drainage holes and minor diameter guide
Hole cross-sectional periphery curvature of curve is poor, and dedicated Zhu Chishikai branch, sidetracking branch success rate reaches 90% or more, and it is comprehensive to open branch
Efficiency improves 60% or so.
5, double branch's top plate major diameter high position directional long boreholes can the tripping in guard aperture screen casing in strata penetration hole section as needed, with
The unimpeded of extraction channel is maintained, compared with " one, which bores one, expands " method work order branch drilling, (the target crack under same extraction scale
Band internal drilling drilling depth amount is suitable), double branch hole guard aperture screen insertion amounts can reduce 40% to 50%.
Detailed content of the invention can be obtained by aftermentioned explanation and institute's attached drawing.
Detailed description of the invention
Fig. 1 shows the schematic diagram of the construction method of double branch's top plate major diameter high position directional long boreholes of the invention.
Figure 1A and Figure 1B shows the branch point schematic diagram of sidetracking in large diameter hole of the present invention, Qiang Kai minor diameter branch.
Fig. 2A and Fig. 2 B shows the structural schematic diagram of sidetracking branch drill bit in the present invention.
Fig. 3 shows that sidetracking branch drill bit of the invention opens the schematic illustration of branch.
Appended drawing reference:
The coal seam 1- drill site, 2- sealing of hole casing section, 3- strata penetration hole section, 4- working face coal seam, the bis- branch's extraction hole sections of 5-, the side 6-
Brill branch point, 7-S shape profile footprint section, 8- roof fracture band, the brill reaming of 9- top set, 10- top set pilot hole, lower point of 11-
Branch bores reaming, 12- inferior division pilot hole, and 13-PDC cuts the wing, 14- drill bit water hole, 15- sidetracking branch column tooth, the outer ring 16- PDC
Composite sheet, 17- encroachment area, 18- sidetracking branch drill bit desired cut circle, 19- large diameter hole ideal hole wall circle.
Specific embodiment
Referring to Fig. 1, Figure 1A and Figure 1B, it is shown that the construction of double branch's top plate major diameter high position directional long boreholes of the invention
Method.
Wherein, double branch's top plate major diameter high position directional long boreholes are to construct from coal seam drill site 1 to roof fracture band 8
Directional long borehole, it includes sealing of hole casing section 2, strata penetration hole section 3 and double 5 three parts of branch's extraction hole section, the sealing of hole casings
Section 2 is connected to one end of strata penetration hole section 3 from coal seam drill site 1, and double branch's extraction hole sections 5 are located at roof fracture band 8 and connect
In the other end of strata penetration hole section 3, wherein the sealing of hole casing section 2 is faced upward design from coal seam drill site 1, the strata penetration hole section 3 includes
Connect the S-shaped section between the transition hole section and working face coal seam 4 shown in Fig. 1 and roof fracture band 8 of sealing of hole casing section 2
Orbit segment 7, the S-shaped profile footprint section include that inclination angle dullness increases section, inflection point and inclination angle monotone decreasing segment, and double branches take out
It adopts hole section 5 to include Parallel Design and be divided into the top set's brill reaming 9 and inferior division brill reaming 11 of arrangement up and down, the top set bores
Reaming and strata penetration hole section are coaxially connected, and the inferior division bores the side that reaming 11 is connected to the reduction of 7 inclination angle dullness of S-shaped profile footprint section
It bores on branch point.
In order to smoothly realize the construction of Zhong Shuan branch top plate major diameter high position directional long borehole of the present invention, the reason specifically designed
Thought is sealing of hole casing section 2 of first constructing, down tube solid hole；Then reaming 9 is bored by construction strata penetration hole section 3 and top set；Then in strata penetration hole
Construction inferior division bores reaming 11 in the S-shaped profile footprint section of section 3.Wherein, it is to utilize sidetracking branch drill bit that inferior division, which bores reaming 11,
Sidetracking minor diameter branch's pilot hole and reaming on the sidetracking branch point 6 of the S-shaped profile footprint section of strata penetration hole section 3.
Specifically, the construction method of double branch's top plate major diameter high position directional long boreholes of the invention includes following step
It is rapid:
Step 1: the brill for carrying out sealing of hole casing section from coal seam drill site expands construction, and rotary drilling technique can be used, i.e., first apply
The pilot hole of work Φ 96mm or Φ 120mm, reaming to Φ 193mm or Φ 220mm again collar aperture, the reaming can pass through classification
Bore and expand (reaming drilling is carried out from as low as big classification by the drill bit of different-diameter, wherein can by the reaming of Φ 133mm level-one →
Φ 153mm secondary chambering → Φ 193mm three-level reamingThe reaming of Φ 220mm level Four) or once expanded with tower combined drill
Hole, the aperture depth of sealing of hole casing section are not less than 12m, and counterbore depth is not less than 10m, bore and carry out circulating flushing after expanding to predetermined depth
The time in hole is no less than 15min, excludes completely so that drilling cuttings in hole be effectively ensured, and ensure smooth down tube.
Step 2: the down tube solid hole of sealing of hole casing section, the steel that tripping in Φ 178mm or Φ 194mm and wall thickness are 5mm are carried out
Or casing made of organic material, the length of described sleeve pipe are 9.0m~9.5m, described sleeve pipe exposure length≤20cm outside hole,
Sealing is carried out after tripping in casing, and " a two stifled notes " band grouting methol technology can be used and carry out sealing casing, when wherein slip casting waits solidifying
Between no less than 8 hours.
Step 3: carrying out strata penetration hole section 3 and top set bores 9 minor diameter of reaming (Φ 96mm or Φ 120mm) pilot hole and determines
To drilling, it is top set's pilot hole 10 that 9 directional drilling of reaming is bored by the top set, wherein is combined by tripping in directional tool
(successively include conventional lead bit, single bend PDM motor, measurement-while-drilling system and without magnetic drilling rod and logical cable drilling rod etc.) determined
To drilling, wherein the inflection point top rake dullness of S-shaped profile footprint 7 increases in strata penetration hole section 3, inflection point back rake angle dullness reduces；Into
Control top set's pilot hole 10 extends in the upper layer position of roof fracture band after entering destination layer, until projected depth backed off after random orientation group
Bench drill tool.
Step 4: carrying out boring expansion and form the strata penetration hole section 3 and top set's brill reaming 9 of major diameter (>=Φ 153mm), described
It bores and expands through the combination of tripping in borehole-enlarging drilling tool (including reaming bit, conventional reaming drilling rod and centralizer etc.), formed along step 3
Pilot hole be oriented reaming drilling, expand to bottom hole backed off after random reaming way-type drilling unit, to form the strata penetration hole section 3 in Fig. 1
Reaming 9 is bored with top set.
Step 5: referring to Figure 1A, suitable position selectes 6 (institute of sidetracking branch point on S-shaped profile footprint 7 in strata penetration hole section 3
State sidetracking branch point 6 be preferably S-shaped profile footprint inclination angle dullness reduce hole section and with the subsurface of roof fracture band hang down away from
1.5m~2m), then the combination of tripping in sidetracking directional tool is (including sidetracking branch drill bit (diameter of phi 96mm or Φ 120mm), single curved
Screw motor, measurement-while-drilling system, without magnetic drilling rod and logical cable drilling rod etc.), adjust tools for angle circle of deflecting tool in 175 °
To between 190 °, turn on pump inputs high pressure washing liquid drive hole bottom screw motor into hole and the revolution of sidetracking branch drill bit is driven laterally to open
Branch, slowly, at the uniform velocity, sliding feed；Based on the curvature difference of different-diameter circular order, by the sidetracking on sidetracking branch drill bit
Branch's column tooth impact cutting-up downside hole wall quickly makes step, realizes that sidetracking opens the branch of minor diameter under hole wall in large diameter hole
Hole subsequently enters roof fracture band, is oriented drilling in the lower layer position of roof fracture band 8 according to design control track, until
Projected depth backed off after random sidetracking directional tool group, which merges, completes the construction of inferior division pilot hole 12 that inferior division bores reaming 11.
Step 6: referring to Figure 1B, brill expansion is carried out to inferior division pilot hole 12, forms lower point of major diameter (>=Φ 153mm)
Branch bores reaming 11, and the brill expands through the combination of tripping in borehole-enlarging drilling tool (including enlarging aiguille, conventional reaming drilling rod and centralizer etc.), edge
The inferior division pilot hole 12 formed in step 5 is oriented reaming drilling, expands to bottom hole backed off after random borehole-enlarging drilling tool and combines, thus
The inferior division formed in Fig. 1 bores reaming 11.
Also may include step 7: complete hole extraction, based on relevant characterization information in drilling process (including feed pressure, revolution
Torque, pump pressure variation and card resistance situation) overall merit top plate formation stability, it as needed can be in strata penetration hole section tripping in guard aperture
Pipe, tubing string front end (respective branches point position) use circular hole or bar shaped slit screen pipes；Connection extraction pipeline waits extraction to adopt release
Gas.
Supporting drilling tool in the present invention may include the combination of sidetracking directional tool used in step 5, the sidetracking Directional Drilling
Tool combination includes sidetracking branch drill bit, single bend PDM motor, measurement-while-drilling system, non-magnetic drilling tool and logical cable drill string etc., referring to
Fig. 2A and Fig. 2 B, sidetracking branch drill bit include that four PDC cut the wing 13, and four PDC cutting wing 13 is in 90 ° of angle cloth
It sets, the drill bit head periphery of the PDC cutting wing 13 between any two is inlaid with a sidetracking branch column tooth 15, the sidetracking branch
Column tooth 15 is pyramid shape cutting edge, the maximum of the outer ring PDC composite sheet 16 of the theoretical diameter and PDC cutting wing 13 for sword of going out
It is identical to cut diameter of a circle, and is equipped at least two drill bit water holes 14 in chisel edge, so that flushing liquor is through boring in drilling process
Head water hole 14 cools down PDC composite sheet and sidetracking branch column tooth after flowing out simultaneously.
Existing knot can be used in other single bend PDM motors, measurement-while-drilling system, non-magnetic drilling tool and logical cable drill string etc.
Structure is stated without tired herein.
Referring to Fig. 3, sidetracking branch drill bit hanging sidetracking small diameter bore in the 7 strata penetration hole section of S-shaped profile footprint of major diameter
Basic principle are as follows: each PDC cutting wing 13 is contacted with downside hole wall cycle alternation in drilling process, due to sidetracking branch drill bit
There are curvature differences between desired cut circle 18 and large diameter hole ideal hole wall circle 19, when two PDC cutting wings contact hole wall simultaneously
When just form " encroachment area " 17, the sidetracking branch column tooth between each PDC cutting wing 13 exactly utilizes curvature difference, in turning course
In on the downside of " impact-cutting-up " hole wall and form step surface and then combine side together with the outer ring PDC composite sheet 16 on the cutting wing 13
It bores, Qiang Kai branch, therefore, the present invention is by this specially designed drill bit structure, the major diameter extraction that can be formed using reaming
The round curvature difference with minor diameter sidetracking branch drill bit desired cut circular curve in hole section is straight greatly in the top plate that " Kong Yikuo " is drilled to
In diameter high position directional long borehole strata penetration hole section (using S-shaped (forward or backwards) profile footprint), opened by force by sidetracking branch drill bit
Simultaneously directional drilling then carries out reaming to minor diameter branch pilot hole again, realizes 2 sections of destination layers to hole depth is designed for minor diameter branch
Interior effective drainage holes share same strata penetration hole section and sealing of hole casing hole section, and the number of openings is greatly decreased, reduces setting of casing and later period
Guard aperture project amount shortens the horizontal footage unpayable of strata penetration hole section, improves pore-forming efficiency and quality, and being conducive to, which improves working face, adopts
Dynamic pressure relief gas pumping mining effect.
Wherein, sidetracking branch drill bit with sidetracking branch column tooth (pyramid shape cutting edge), be laid in PDC cutting the wing it
Between, sword theoretical diameter of going out is identical as outer ring PDC composite sheet maximum cutting diameter.In normal drilling process, sidetracking branch is bored
Head is identical as conventional lead bit function, and sidetracking branch column tooth does not work；In major diameter reaming section sidetracking minor diameter branch mistake
Cheng Zhong, poor based on different circumferential curvatures, with bit, sidetracking branch column tooth impacts hole wall on the downside of cutting-up, gradually forms platform
Terrace, secondary outer PDC composite sheet side cutting realize hanging sidetracking, the straight branch of Qiang Kai little in major diameter S-shaped strata penetration hole section
Hole, and start normal orientation drilling branch's pilot hole.
It is readily apparent that above description and record is only illustrated in the disclosure being not intended to be limiting of the invention
Appearance, application or use.Although describing and being described in the accompanying drawings embodiment in embodiment, the present invention is not limited
Be described as by attached drawing example and in embodiment it is now recognized that optimal mode to implement the particular case of the teachings of the present invention
Son, the scope of the present invention will include any embodiment for falling into the description and appended claims of front.
Claims (5)
1. a kind of construction method of double branch's top plate major diameter high position directional long boreholes, double branch's top plate major diameter high positions are fixed
It is from working face coal seam drill site to the directional long borehole of roof fracture belt construction to long drilled holes, it includes 1 section of sealing of hole casing section, 1
Section strata penetration hole section and 2 sections of extraction hole section three parts, it is characterised in that:
The sealing of hole casing section is connected to the lower end of strata penetration hole section from working face coal seam drill site, and 2 sections of drainage holes sections are located at top
Be connected to the upper end of strata penetration hole section in plate fissure zone and in the form of double branches, the strata penetration hole section be included in working face coal seam and
S-shaped profile footprint section between roof fracture band, the S-shaped profile footprint section include that inclination angle dullness increases section, inflection point and inclination angle
Monotone decreasing segment, double branch's extraction hole sections include top set's brill reaming and the inferior division of Parallel Design and upper and lower layered arrangement
Reaming is bored, reaming is bored by the top set and strata penetration hole section is coaxially connected, and the inferior division brill reaming is connected to S-shaped profile footprint and inclines
On the sidetracking branch point of angle monotone decreasing segment；
The construction method are as follows: sealing of hole casing section of first constructing, down tube solid hole；Then reaming section bores in construction strata penetration hole section and top set
Minor diameter pilot hole, and bore expansion and form major diameter strata penetration hole section and top set's extraction hole section；Then in major diameter strata penetration hole section S
The hanging sidetracking inferior division of shape profile footprint latter end bores the minor diameter pilot hole of reaming section, and bores and expand the inferior division pumping for forming major diameter
Adopt hole section；Finally, forming double branches major diameter high position directional long borehole.
2. the construction method of double branches top plate major diameter high position directional long borehole as described in claim 1, it is characterised in that packet
Containing following steps:
Step 1: the brill for carrying out sealing of hole casing section from working face coal seam drill site expands construction, uses rotary drilling technique；
Step 2: the down tube solid hole of sealing of hole casing section is carried out；
Step 3: carrying out measurement while drilling directional drilling to the minor diameter pilot hole that strata penetration hole section and top set bore reaming, described to wear
Layer hole section is crept into along S-shaped profile footprint；
Step 4: it carries out boring expansion and forms the strata penetration hole section and top set's brill reaming of major diameter, the brill, which expands, passes through replacement reaming
Drill assembly, the pilot hole formed along step 3 are oriented reaming drilling, expand to bottom hole backed off after random borehole-enlarging drilling tool and combine；
Step 5: selecting sidetracking branch point on the monotone decreasing segment suitable position of major diameter strata penetration hole section S-shaped profile footprint inclination angle,
Then tripping in is incorporated into branch point position with the directional tool of sidetracking branch drill bit, adjust tools for angle circle of deflecting drilling tool in
Between 175 ° to 190 °, turn on pump inputs high pressure washing liquid drive hole bottom screw motor into hole and drives sidetracking branch drill bit revolution side
Zuan Kai branch, realize in large diameter hole under hole wall sidetracking open enter after minor diameter branched hole the lower layer position of roof fracture band into
The pilot hole construction that inferior division bores reaming is completed in row directional drilling；
Step 6: carrying out brill expansion to the pilot hole of inferior division, and the inferior division for forming major diameter bores reaming, and the brill expansion passes through tripping in
Borehole-enlarging drilling tool is incorporated into branch point, and the inferior division pilot hole formed along step 5 is oriented reaming drilling, expands to bottom hole
Exit borehole-enlarging drilling tool combination.
3. the construction method of double branches top plate major diameter high position directional long borehole as claimed in claim 2, it is characterised in that: under
Directional tool combination includes sidetracking branch drill bit used by the pilot hole that reaming is bored by branch is constructed, by sidetracking branch drill bit
Sidetracking branch column tooth impact cutting-up on the downside of hole wall, the curvature difference based on different-diameter circular order quickly make step, realize big
Hanging sidetracking goes out branch's pilot hole of minor diameter in the S-shaped profile footprint hole section of diameter.
4. a kind of supporting drilling tool of double branch's top plate major diameter high position directional long borehole construction methods includes particular orientation drill set
It closes, it is characterised in that:
The particular orientation drill assembly include sidetracking branch drill bit, single bend PDM motor, measurement-while-drilling system, non-magnetic drilling tool and
Logical cable drill string, sidetracking branch drill bit include that four PDC cut the wing, and four PDC cutting wing 13 is in 90 ° of angle cloth
It sets, the drill bit head periphery of the PDC cutting wing between any two is inlaid with a sidetracking branch column tooth, sidetracking branch column
Tooth is pyramid shape cutting edge, and the maximum cutting circle of the theoretical diameter and the outer ring PDC composite sheet of the PDC cutting wing of sword of going out is straight
Diameter is identical, so that sidetracking branch drill bit is identical as conventional lead bit function, and sidetracking branch column tooth does not rise in normal drilling process
Effect；It is poor based on different circumferential curvatures in large diameter hole in the branching process of sidetracking minor diameter, with bit, sidetracking branch
Column tooth successively, intermittently impacts cutting-up downside hole wall, gradually forms step surface, and secondary outer PDC composite sheet side cutting is real
Hanging sidetracking, the straight branched hole of Qiang Kai little in the S-shaped profile footprint hole of present major diameter, and can normal orientation drilling branch guiding
Hole.
5. the supporting drilling tool of double branches top plate major diameter high position directional long borehole construction method as claimed in claim 4, special
Sign is: the sidetracking branch column tooth of sidetracking branch drill bit is embedded in the angle plane of symmetry position of two corresponding PDC cutting wings, and bores
Head front end is equipped at least two water holes, thus in drilling process, flushing liquor cooling PDC composite sheet simultaneously after drill bit water hole is flowed out
With sidetracking branch column tooth.
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| CN113075734A (en) * | 2021-03-30 | 2021-07-06 | 中煤科工集团西安研究院有限公司 | Residual curvature spectrum calculation method and device based on signal-to-noise ratio constraint |
| CN114412423A (en) * | 2021-12-22 | 2022-04-29 | 中煤科工集团西安研究院有限公司 | Broken soft coal seam gas extraction bedding directional drilling sieve tube running device and method |
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| CN113075734A (en) * | 2021-03-30 | 2021-07-06 | 中煤科工集团西安研究院有限公司 | Residual curvature spectrum calculation method and device based on signal-to-noise ratio constraint |
| CN113075734B (en) * | 2021-03-30 | 2024-03-29 | 中煤科工集团西安研究院有限公司 | Residual curvature spectrum calculation method and device based on signal-to-noise ratio constraint |
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