CN111305756A - Large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit and using method thereof - Google Patents
Large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit and using method thereof Download PDFInfo
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- CN111305756A CN111305756A CN202010102130.1A CN202010102130A CN111305756A CN 111305756 A CN111305756 A CN 111305756A CN 202010102130 A CN202010102130 A CN 202010102130A CN 111305756 A CN111305756 A CN 111305756A
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- 239000002893 slag Substances 0.000 title claims abstract description 116
- 238000005553 drilling Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000002689 soil Substances 0.000 claims abstract description 37
- 239000011435 rock Substances 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 238000003466 welding Methods 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 16
- 239000000956 alloy Substances 0.000 claims description 21
- 229910045601 alloy Inorganic materials 0.000 claims description 21
- 238000009434 installation Methods 0.000 claims description 15
- 239000002002 slurry Substances 0.000 claims description 7
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000004062 sedimentation Methods 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 6
- 239000013049 sediment Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 5
- 238000011065 in-situ storage Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 241000761557 Lamina Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010802 sludge Substances 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
- E21B10/42—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
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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
-
- 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
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
- E21B10/627—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable with plural detachable cutting elements
- E21B10/633—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable with plural detachable cutting elements independently detachable
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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
- E21B12/00—Accessories for drilling tools
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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
- E21B12/00—Accessories for drilling tools
- E21B12/06—Mechanical cleaning devices
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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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- Geology (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit and a using method thereof. The bottom of drill bit core pipe is fixed with the steel sheet of sealing, installs 3 ~ 4 groups of pilot hole pterygoid lamina below sealing the steel sheet, installs 3 ~ 4 groups reaming pterygoid lamina at the lateral wall of drill bit core pipe, installs between two adjacent reaming pterygoid lamina in the middle and lower part of drill bit core pipe and inhales the sediment pipe, all has the welding in the detritus side and the bottom surface of pilot hole pterygoid lamina, reaming pterygoid lamina have the carbide piece. The drill bit has strong guidance and stability, and rock soil slag crushed by the drill bit can be discharged to a ground mud pit for purification in a reverse circulation manner through a pump in time. The multi-slag suction port wing-shaped drill bit has the advantages of convenience in operation and use, high hole forming efficiency of step grading crushing rock and soil, good slag discharging effect, good drilling quality and the like.
Description
Technical Field
The invention relates to the field of large-diameter drilling engineering construction of cast-in-situ bored piles, hydrological wells and the like, in particular to a large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit and a using method thereof.
Background
For the construction of large-diameter drilling projects such as cast-in-situ bored piles and hydrographic wells, the drilled stratum is mainly rock soil layers such as quaternary sedimentary soil layer, gravel layer and weathered rock, the drilling depth is 15-200 m, and the drilling diameter is
Due to the fact that the diameter of the drilled hole of the engineering hole is large, the hole cannot be formed at one time, a pilot hole needs to be drilled in advance, and then the designed drilled hole diameter can be achieved through 1-2 times of hole expansion. Conventional reaming drilling mainly adopts ordinary pterygoid lamina formula reamer bit, and 3 ~ 4 reaming pterygoid laminas (inlaying the carbide piece on the pterygoid lamina) of direct welding in the drill bit body outside promptly, only set up the end opening of drill bit center tube and regard as inhaling the cinder notch, arrange the sediment effect poor, cause reaming pterygoid lamina work load big, the wearing and tearing are very fast, will frequently change the drill bit, drilling efficiency is low, and the drill bit use cost is high.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit and the use method thereof, wherein the advanced rock crushing of the wing plate of the pilot hole is carried out, the secondary rock crushing and hole expanding of the hole expanding wing plate are carried out, the hole forming of a rock soil body crushed by two steps is synchronously realized, the guidance performance and the stability of the drill bit are enhanced, the rock soil slag crushed by the drill bit can be timely discharged to a ground mud pit through the pump suction reverse circulation to be purified, the slag suction and slag discharge of the multi-slag suction port are faster, and the probability of repeated crushing of rock soil slag at the bottom of the hole is greatly reduced. The patent of the invention belongs to the research result funded by the national science fund project (project number: 51678083).
The purpose of the invention is realized by the following technical scheme.
The large-diameter reverse circulation drilling wing-shaped drill bit with the multiple slag suction ports comprises a flange plate, a drill bit core pipe, reaming wing plates, a slag suction pipe, a hard alloy block, a pilot hole wing plate and a sealing steel plate, wherein the flange plate is welded to the upper portion of the drill bit core pipe, the sealing steel plate is fixed to the bottom end of the drill bit core pipe, 3-4 groups of pilot holes are installed below the sealing steel plate, 3-4 groups of reaming wing plates are installed on the side wall of the drill bit core pipe, slag suction ports are symmetrically formed in the middle lower portion of the drill bit core pipe, the slag suction pipe is installed between two adjacent reaming wing plates in the middle lower portion of the drill bit core pipe, the slag suction ports are connected with the slag suction pipe, and the hard alloy block is welded to the side faces and the bottom sides of the pilot hole.
Furthermore, the drill bit core tube has an outer diameter phi of 200-400 mm, a tube wall thickness of 10-20 mm and a height of 600-1500 mm.
Furthermore, the number of the slag suction ports is the same as that of the reaming wing plates, and the diameter of the slag suction ports is phi 100-150 mm.
Furthermore, the height of the wing plate of the pilot hole is 150-300 mm, the bottom of the wing plate of the pilot hole is in a broken line shape, and the total width of the wing plate of the pilot hole is matched with the radius of a core tube of the drill bit; the height of the outermost side of the reaming wing plate is 300-500 mm, the bottom of the reaming wing plate is in an oblique line shape, the reaming wing plate and the wing plate of the pilot hole are symmetrically installed at intervals, and the diameter formed by the installed wing plate of the pilot hole is phi 400-1500 mm; and the wing plate connecting band is arranged at the middle upper part of the reaming wing plate and is arc-shaped, the thickness of the wing plate connecting band is 10-20 mm, the width of the wing plate connecting band is 20-40 mm, and the diameter of a circle formed by the wing plate connecting band after installation is 95-105mm smaller than the outer diameter of the reaming wing plate.
Further, the pterygoid lamina connecting band is installed on the well upper portion of reaming pterygoid lamina, add between pterygoid lamina connecting band and the drill bit heart pipe and establish a plurality of horizontal muscle area, horizontal muscle area is for constituting latticed bearing structure.
Furthermore, the slag suction pipe is a steel pipe with the diameter phi of 100-150 mm, the slag suction pipe is installed on a slag suction port of the drill bit core pipe by adopting a welding method, the included angle between the axis of the slag suction pipe and the axis of the core pipe is not less than 50 degrees and not more than α and not more than 70 degrees after installation, the axis of the pipe orifice of the slag suction pipe faces the center of the oblique line at the bottom of the reaming wing plate, and the outline size of the outermost side of the pipe wall of the slag suction pipe is at least 30mm smaller than the outline size of the oblique line at the.
Furthermore, the side surfaces of the pilot hole wing plate and the reaming wing plate are the sides of the drill bit which rotate clockwise and directly contact the rock-soil layer, and the hard alloy block is in a sheet shape, a square column shape or an octagonal column shape.
A use method of a large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit utilizes the large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit and comprises the following steps:
1) connecting a drill rod with a flange plate on the upper part of a central pipe of a drill bit body, starting a drilling machine to pressurize and rotate the drilling machine, simultaneously conveying wall protection slurry into a hole, starting the multi-slag suction port wing-shaped drill bit to crush a rock-soil layer, and synchronously realizing two-step graded crushing rock-soil body hole forming through advanced rock crushing of a pilot hole wing plate and secondary rock crushing and hole expanding of a hole expanding wing plate;
2) starting a sand pump, sucking the crushed rock-soil slag of the wing-shaped drill bit with the multiple slag suction ports by negative pressure formed in the inner hole of the drill rod, namely generating a certain vacuum degree in the inner hole of the drill rod, wherein the mud at the bottom of the hole wraps and clamps the mud slag, and the mud slag enters the core tube of the drill bit through the slag suction tube and is discharged to a ground mud circulating system from the inner hole of the drill rod; the mud purified by the sedimentation tank enters the bottom of the hole through the annular gap between the drill rod and the hole wall, so that reverse circulation deslagging is continuously carried out, and the drilling depth is continuously increased.
Further, the rotation speed of the drilling tool is 60-150 r/min, and the pump capacity of flushing liquid is 100-300 m3And h, drilling pressure is 10-50 kN, and when the hole depth is increased to a certain depth, pressurizing and drilling to form a hole by means of self weight of the drilling tool.
Compared with the prior art, the invention has the advantages that: when the multi-slag-suction-port wing-shaped drill bit disclosed by the invention is used for drilling, the advanced rock crushing of the wing plate of the pilot hole and the secondary rock crushing and hole expanding of the hole expanding wing plate are carried out, so that the hole forming of a rock soil body crushed by two steps is synchronously realized, the guidance and the stability of the drill bit are enhanced, the rock soil slag crushed by the drill bit can be timely discharged to a ground mud pit for purification through the reverse circulation of a pump, the slag suction and slag discharge by adopting the multi-slag-suction-port are quicker, and the probability of repeated crushing of rock soil slag at the bottom of the hole.
The multi-slag suction port wing-shaped drill bit has the advantages of convenience in operation and use, high hole forming efficiency of the stepped graded crushed rock and soil body, good slag discharging effect, good drilling quality and the like, and is relatively suitable for large-diameter drilling engineering construction of cast-in-situ bored piles, hydrological wells and the like. The large-diameter pile hole is drilled in various soil layers and sand gravel layers, the drilling efficiency can be improved by 30-40% compared with that of a common hole expanding drill bit under the same condition, the drilling time efficiency can reach 5-10 m/h, the outer edges of the hard alloy blocks embedded in the guide hole wing plates and the hole expanding wing plates can be replaced in time after being seriously worn, the whole drill bit wing plate does not need to be replaced, the cost of the drill bit can be reduced by 35-65%, and the economic benefit is remarkable.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of an a-direction three-wing multi-nozzle wing-shaped drill bit in fig. 1.
Fig. 3 is a schematic view of the a-direction four-wing multi-nozzle wing-shaped drill bit in fig. 1.
In the figure: 1. a flange plate; 2. a drill core tube; 3. reaming wing plates; 4. a slag suction pipe; 5. a hard alloy block; 6. a pilot hole wing plate; 7. sealing a steel plate; 8. the wing plate is connected with the belt.
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples.
As shown in figures 1-3, the large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit mainly comprises a flange plate 1, a drill bit core pipe 2, a reaming wing plate 3, a slag suction pipe 4, a hard alloy block 5, a pilot hole wing plate 6, a sealing steel plate 7, a wing plate connecting belt 8 and the like.
The outer diameter phi of the drill bit core tube is 200-400 mm, the thickness of the tube wall is 10-20 mm, the height is 600-1500 mm (generally larger than the designed diameter of a drill hole), and a flange plate is welded on the upper portion of the drill bit core tube so as to be connected with a drill rod; a sealing steel plate is fixed at the bottom end of the drill core tube by a welding method; 3-4 groups of guide hole wing plates are arranged below the sealing steel plate, and the installation method is a welding method; installing 3-4 groups of reaming wing plates on the side wall of the drill bit core tube, wherein the installation method is a welding method; the middle lower part of the drill bit core pipe is symmetrically provided with slag suction ports (the number of the slag suction ports is the same as that of the reaming wing plates to be installed), and the diameter of each slag suction port is phi 100-150 mm (generally 1/2-1/3 of the outer diameter of the drill bit core pipe) so as to be connected with the slag suction pipe.
The height of the wing plate of the pilot hole is 150-300 mm, the bottom of the wing plate of the pilot hole is in a zigzag shape (formed by combining an inclined plane and a plane), and the total width of the wing plate of the pilot hole is equivalent to the radius of the core tube of the drill bit (the wing plate of the pilot hole exceeds the outer edge of the core tube of the drill bit by about 15mm after being installed); the height of the outermost side of the reaming wing plate is 300-500 mm, the bottom of the reaming wing plate is in an oblique line shape, the reaming wing plate and the guide hole wing plate are symmetrically installed at intervals, and the diameter formed by the installed hole wing plate is phi 400-1500 mm (the specific size is determined according to the designed diameter of a drilled hole); and 2 wing plate connecting belts are arranged at the middle upper part of the reaming wing plate (the installation method is a welding method), the wing plate connecting belts are arc-shaped, the thickness of the wing plate connecting belts is 10-20 mm, the width of the wing plate connecting belts is 20-40 mm, the diameter of a circle formed by the wing plate connecting belts after installation is about 100mm smaller than the outer diameter of the reaming wing plate, and in order to enhance the stability of the reaming wing plate, a plurality of transverse rib belts (namely a grid-shaped supporting structure) can be additionally arranged between the wing plate connecting belts and the drill bit core tube.
The slag suction pipe is a steel pipe with the diameter phi of 100-150 mm (matched with the size of a slag suction opening of the drill bit core pipe), the slag suction pipe is installed on the slag suction opening of the drill bit core pipe by adopting a welding method, the included angle between the axis of the slag suction pipe and the axis of the core pipe is α -50-70 degrees after installation, the axis of the pipe opening of the slag suction pipe faces the center of an oblique line at the bottom of the reaming wing plate, and the outermost contour dimension of the pipe wall of the slag suction pipe is at least 30mm smaller than the contour dimension of the oblique line at the bottom of the reaming.
The hard alloy blocks are in the shapes of sheets, square columns, octagonal columns and the like, and are welded on the side surfaces (the side which is in clockwise rotation and is in direct contact with the rock-soil layer) and the bottom sides of the guide hole wing plates and the reaming wing plates in an inlaying mode so as to be beneficial to crushing the rock-soil layer. In the process of rock breaking, if the hard alloy blocks are slightly worn, the hard alloy blocks can be used continuously by timely grinding; if the hard alloy block is heavily worn, the new hard alloy block can be replaced in time so as to prolong the service life of the large-diameter reverse circulation drilling multi-slag-suction-port wing-shaped drill bit. If the wing plates of the pilot hole and the reaming wing plates are seriously abraded, the outer edges of the hard alloy blocks embedded in the wing plates can be replaced in time without replacing the wing plate body of the whole drill bit.
The use method of the multi-slag suction opening large-diameter reverse circulation drilling stepped wing-shaped drill bit comprises the following steps:
(1) connecting a drill rod with a flange plate on the upper part of a central pipe of a drill bit body, starting a drilling machine to pressurize and rotate the drilling machine, simultaneously conveying wall protection slurry into a hole, starting the wing-shaped drill bit with a plurality of slag suction ports to crush a rock-soil layer, and synchronously realizing the step-graded crushing and hole forming of the rock-soil body twice through the advanced rock crushing of the wing plates of the pilot hole and the secondary rock crushing of the reaming wing plates.
(2) The sandstone pump is started, and rock-soil slag crushed by the wing-shaped drill bit with the multiple slag suction ports is sucked upwards (back circulation slag discharge) through negative pressure (namely certain vacuum degree) formed in the inner hole of the drill rod. At the moment, bottom hole slurry (wrapped with the clamped sludge) enters the drill bit core tube through the slag suction tube and is discharged to the ground slurry circulating system from the inner hole of the drill rod; the mud purified by the sedimentation tank enters the bottom of the hole through the annular gap between the drill rod and the hole wall, so that reverse circulation deslagging is continuously carried out, and the drilling depth is continuously increased.
The large-diameter reverse circulation drilling parameters of the multi-slag suction port wing-shaped drill bit are as follows: the rotation speed of the drilling tool is 60-150 r/min, and the pump capacity of the flushing liquid is 100-300 m3And h, the drilling pressure is 10-50 kN, and when the hole depth is increased to a certain depth, the hole can be drilled in a pressurizing mode by means of the self weight of the drilling tool.
Example 1
Diameter of drilled hole in certain cast-in-situ bored pile engineering
The drilling stratum mainly comprises a quaternary soil layer, a tertiary soil layer and a mudstone weathering zoneAnd the drilling depth is 80 m. The large-diameter reverse circulation drilling multi-slag suction port three-wing drill bit is selected for drilling engineering construction.
The outer diameter of a drill bit core pipe is phi 203.2mm (8 'seamless steel pipe), the thickness of the pipe wall is 15mm, the height is 1000mm (200 mm larger than the designed diameter of a drilling hole), a flange is welded at the upper part of the drill bit core pipe so as to be connected with an 8' drill rod, a sealing steel plate is fixed at the bottom end of the drill bit core pipe by a welding method, 3 groups of pilot hole wing plates are installed below the sealing steel plate by a welding method, the height of the pilot hole wing plates is 200mm, the bottom of the pilot hole wing plates is in a broken line shape (formed by combining an inclined plane and a plane), the total width of the pilot hole wing plates is 117mm (exceeding the outer edge of the drill bit core pipe by 15mm after installation), 3 groups of reaming wing plates are installed on the side wall of the drill bit core pipe by a welding method, the height of the outermost side edge of the reaming wing plates is 400mm, the width is 300mm, the bottom of the reaming wing plates is in an oblique line shape, the reaming wing plates and the rock soil are symmetrically installed with the diameter phi of the wing plates, the diameter formed by a phi 803mm after installation wing plates, a connecting belt is installed in the straight hole, the straight pipe, the straight slag suction pipe is installed on the bottom of the slag suction pipe, the alloy slag suction pipe is 60mm, the alloy slag suction pipe, the alloy suction pipe is 100mm, the alloy suction pipe is installed in the slag suction pipe, the slag suction pipe is 60mm, the slag suction pipe is installed.
The use method of the multi-slag suction opening large-diameter reverse circulation drilling step three-wing drill bit comprises the following steps:
(1) connecting the 8' drill rod with a flange plate on the upper part of a central tube of the drill bit body, starting a drilling machine to pressurize and rotate the drilling machine, simultaneously conveying wall protection slurry into the hole, starting the three-wing-shaped drill bit with the multi-slag suction port to crush the rock-soil layer, and synchronously realizing the step-graded crushing and hole forming of the rock-soil body twice through the advanced rock crushing of the wing plate of the pilot hole and the secondary rock crushing and hole expanding of the hole expanding wing plate.
(2) The sandstone pump is started, and rock-soil slag crushed by the wing-shaped drill bit with the multiple slag suction ports is sucked upwards (back circulation slag discharge) through negative pressure (namely certain vacuum degree) formed in the inner hole of the drill rod. At the moment, bottom hole mud (wrapped with the clamped mud) enters the drill bit core tube through the three slag suction tubes and is discharged to a ground mud circulating system from an 8' inner hole of the drill rod; the mud purified by the sedimentation tank enters the bottom of the hole through the annular gap between the drill rod and the hole wall, so that reverse circulation deslagging is continuously carried out, and the drilling depth is continuously increased.
The drilling parameters are as follows: the rotation speed of the drilling tool is 100r/min, the pump capacity of flushing liquid is 180m3And h, drilling pressure is 30kN, and when the hole depth is increased by 50m, pressurizing by means of the self weight of the drilling tool to drill a hole.
The total drilling time is 10h, the drilling time efficiency reaches 8m/h, no sediment is in the hole through detection, and the hole wall is regular. After one drilling hole is finished, the whole drill bit is not worn. Compared with the conventional drill bit, the drilling cost is reduced by 40 percent, and the economic benefit is obvious.
Example 2
Diameter of drilled hole in certain cast-in-situ bored pile engineering
The drilling stratum mainly comprises a quaternary soil layer, a tertiary soil layer and a sandstone weathering zone, and the drilling depth is 60 m. The large-diameter reverse circulation drilling multi-slag suction port four-wing drill bit is selected for drilling engineering construction.
The outer diameter of the drill bit core tube is phi 304.8mm (12 'seamless steel tube), the wall thickness of the tube is 18mm, the height of the tube is 1500mm (larger than the designed diameter of a drill hole by 300mm), and a flange plate is welded on the upper part of the drill bit core tube so as to be connected with a 12' drill rod; a sealing steel plate is fixed at the bottom end of the drill core tube by a welding method; 4 groups of guide hole wing plates are arranged below the sealing steel plate, the installation method is a welding method, the height of each guide hole wing plate is 240mm, the bottom of each guide hole wing plate is in a zigzag shape (formed by combining an inclined surface and a plane), and the total width of each guide hole wing plate is 167mm (the guide hole wing plates exceed the outer edge of the drill core tube by about 15mm after being installed); the side wall of the drill core pipe is provided with 4 groups of reaming wing plates, the installation method is a welding method, the height of the outermost side of each reaming wing plate is 500mm, the width of each reaming wing plate is 450mm, the bottom of each reaming wing plate is in an oblique line shape, the reaming wing plates and the wing plates of the pilot holes are symmetrically installed at intervals, the diameter formed by the installed wing plates of the rear holes is phi 1205mm, the upper middle part of each reaming wing plate is provided with a wing plate connecting belt (the installation method is the welding method), each wing plate connecting belt is in an arc shape, the thickness of each wing plate connecting belt is 18mm, the width of each wing plate connecting belt is 35mm, the diameter of a circle surrounded by the installed wing plate connecting belts is phi 1000mm, in order to enhance the stability of reaming, 2 wing plate connecting belts are arranged, and a plurality of transverse rib belts (the thickness of the transverse.
Four slag suction ports with the diameter of 100mm are symmetrically arranged at the middle lower part of a drill bit core pipe, a steel pipe (6' seamless steel pipe) with the diameter of 152.4mm is selected as a slag suction pipe, the slag suction pipe is installed on the slag suction port of the drill bit core pipe by adopting a welding method, the included angle between the axis of the slag suction pipe and the axis of the center pipe is α to 65 degrees after installation, the axis of the pipe orifice of the slag suction pipe faces to the center of the oblique line at the bottom of the reaming wing plate, the outermost side contour dimension of the pipe wall of the slag suction pipe does not exceed the contour dimension of the oblique line at the bottom of the reaming wing plate after installation, a 60mm gap is left, an octagonal columnar hard alloy block is selected and welded on a guide hole, the side surface (the side of the rock-soil layer which is rotated clockwise) and the bottom side surface of the reaming wing plate, wherein the hard alloy block on the side surface of the wing plate is.
The use method of the multi-slag suction opening large-diameter reverse circulation drilling step four-wing drill bit comprises the following steps:
(1) and connecting the 12' drill rod with a flange plate on the upper part of a central tube of the drill bit body, starting the drilling machine to pressurize and rotate the drilling machine, simultaneously conveying wall protection slurry into the hole, starting the four-wing-shaped drill bit with the multi-slag suction port to crush the rock-soil layer, and synchronously realizing the step-graded crushing and hole forming of the rock-soil body twice through the advanced rock crushing of the wing plate of the pilot hole and the secondary rock crushing and hole expanding of the hole expanding wing plate.
(2) The sandstone pump is started, and rock-soil slag crushed by the wing-shaped drill bit with the multiple slag suction ports is sucked upwards (back circulation slag discharge) through negative pressure (namely certain vacuum degree) formed in the inner hole of the drill rod. At the moment, bottom hole mud (wrapped with the clamped mud) enters the drill bit core tube through the four slag suction tubes and is discharged to a ground mud circulating system from an inner hole of the 12' drill rod; the mud purified by the sedimentation tank enters the bottom of the hole through the annular gap between the drill rod and the hole wall, so that reverse circulation deslagging is continuously carried out, and the drilling depth is continuously increased.
The drilling parameters are as follows: the rotation speed of the drilling tool is 80r/min, the pump capacity of flushing liquid is 260m3And h, drilling pressure is 40kN, and when the hole depth is increased by 50m, pressurizing by means of the self weight of the drilling tool to drill a hole.
The total drilling time is 11h, the drilling aging time reaches 5.45m/h, no sediment is in the hole through detection, and the hole wall is regular. After one drilling hole is finished, the whole drill bit is not worn. Compared with the conventional drill bit, the drilling cost is reduced by 43 percent, and the economic benefit is obvious.
Claims (9)
1. The large-diameter reverse circulation drilling wing-shaped drill bit with the multiple slag suction ports is characterized by comprising a flange plate, a drill bit core pipe, hole expansion wing plates, a slag suction pipe, a hard alloy block, pilot hole wing plates and a sealing steel plate, wherein the flange plate is welded at the upper part of the drill bit core pipe, the sealing steel plate is fixed at the bottom end of the drill bit core pipe, 3-4 groups of pilot hole wing plates are installed below the sealing steel plate, 3-4 groups of hole expansion wing plates are installed on the side wall of the drill bit core pipe, the slag suction ports are symmetrically formed in the middle lower part of the drill bit core pipe, the slag suction pipe is installed between two adjacent hole expansion wing plates in the middle lower part of the drill bit core pipe, the slag suction ports are connected with the slag suction pipe, and the hard alloy block is welded on the side faces and the bottom.
2. The large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit according to claim 1, characterized in that the outer diameter of the core tube of the drill bit is 200-400 mm, the thickness of the tube wall is 10-20 mm, and the height is 600-1500 mm.
3. The large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit according to claim 1 or 2, characterized in that the number of the slag suction ports is the same as that of the reaming wing plates, and the diameter of the slag suction ports is phi 100-150 mm.
4. The large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit according to claim 1 or 2, characterized in that the height of the wing plate of the pilot hole is 150-300 mm, the bottom of the wing plate of the pilot hole is in a zigzag shape, and the total width of the wing plate of the pilot hole is matched with the radius of a core pipe of the drill bit; the height of the outermost side of the reaming wing plate is 300-500 mm, the bottom of the reaming wing plate is in an oblique line shape, the reaming wing plate and the wing plate of the pilot hole are symmetrically installed at intervals, and the diameter formed by the installed wing plate of the pilot hole is phi 400-1500 mm; and the wing plate connecting band is arranged at the middle upper part of the reaming wing plate and is arc-shaped, the thickness of the wing plate connecting band is 10-20 mm, the width of the wing plate connecting band is 20-40 mm, and the diameter of a circle formed by the wing plate connecting band after installation is 95-105mm smaller than the outer diameter of the reaming wing plate.
5. The large-diameter reverse circulation drilling multi-slag-suction-port wing-shaped drill bit according to claim 4, characterized in that a wing plate connecting belt is installed at the middle upper part of the reaming wing plate, a plurality of transverse ribs are additionally arranged between the wing plate connecting belt and a drill bit core tube, and the transverse ribs form a grid-shaped supporting structure.
6. The large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit as claimed in claim 3, wherein the slag suction pipe is a steel pipe with a diameter of phi 100-150 mm, the slag suction pipe is installed on the slag suction port of the drill bit core pipe by adopting a welding method, an included angle between the axis of the slag suction pipe and the axis of the center pipe is 50 degrees to α degrees to 70 degrees, the axis of the pipe mouth of the slag suction pipe faces to the center of the oblique line at the bottom of the reaming wing plate, and the outermost side outline dimension of the pipe wall of the slag suction pipe is at least 30mm smaller than the oblique line outline dimension at the bottom of the reaming wing plate.
7. The large-diameter reverse circulation drilling multi-slag-suction-port wing-shaped drill bit according to claim 1, wherein the side surfaces of the wing plates of the pilot holes and the reaming wing plates are the side which is in clockwise rotation and is in direct contact with a rock-soil layer, and the hard alloy block is in a shape of a sheet, a square column or an octagonal column.
8. The use method of the large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit is characterized by comprising the following steps of:
1) connecting a drill rod with a flange plate on the upper part of a central pipe of a drill bit body, starting a drilling machine to pressurize and rotate the drilling machine, simultaneously conveying wall protection slurry into a hole, starting the multi-slag suction port wing-shaped drill bit to crush a rock-soil layer, and synchronously realizing two-step graded crushing rock-soil body hole forming through advanced rock crushing of a pilot hole wing plate and secondary rock crushing and hole expanding of a hole expanding wing plate;
2) starting a sand pump, sucking the crushed rock-soil slag of the wing-shaped drill bit with the multiple slag suction ports by negative pressure formed in the inner hole of the drill rod, namely generating a certain vacuum degree in the inner hole of the drill rod, wherein the mud at the bottom of the hole wraps and clamps the mud slag, and the mud slag enters the core tube of the drill bit through the slag suction tube and is discharged to a ground mud circulating system from the inner hole of the drill rod; the mud purified by the sedimentation tank enters the bottom of the hole through the annular gap between the drill rod and the hole wall, so that reverse circulation deslagging is continuously carried out, and the drilling depth is continuously increased.
9. The use method of the large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit according to claim 8, wherein the rotation speed of the drilling tool is 60-150 r/min, and the pump capacity of flushing liquid is 100-300 m3And h, drilling pressure is 10-50 kN, and when the hole depth is increased to a certain depth, pressurizing and drilling to form a hole by means of self weight of the drilling tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010102130.1A CN111305756A (en) | 2020-02-19 | 2020-02-19 | Large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010102130.1A CN111305756A (en) | 2020-02-19 | 2020-02-19 | Large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit and using method thereof |
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| Publication Number | Publication Date |
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| CN111305756A true CN111305756A (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010102130.1A Withdrawn CN111305756A (en) | 2020-02-19 | 2020-02-19 | Large-diameter reverse circulation drilling multi-slag suction port wing-shaped drill bit and using method thereof |
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| CN (1) | CN111305756A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718454A (en) * | 2022-04-03 | 2022-07-08 | 陕西长武亭南煤业有限责任公司 | Guide drill rod of horizontal directional drilling machine and construction method thereof |
| CN116181261A (en) * | 2023-03-29 | 2023-05-30 | 安徽理工大学 | Determination method for arrangement of slag sucking ports of shaft sinking drill bit in coal mine vertical shaft drilling method |
-
2020
- 2020-02-19 CN CN202010102130.1A patent/CN111305756A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718454A (en) * | 2022-04-03 | 2022-07-08 | 陕西长武亭南煤业有限责任公司 | Guide drill rod of horizontal directional drilling machine and construction method thereof |
| CN116181261A (en) * | 2023-03-29 | 2023-05-30 | 安徽理工大学 | Determination method for arrangement of slag sucking ports of shaft sinking drill bit in coal mine vertical shaft drilling method |
| CN116181261B (en) * | 2023-03-29 | 2024-03-19 | 安徽理工大学 | Determination method for arrangement of slag sucking ports of shaft sinking drill bit in coal mine vertical shaft drilling method |
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