CN109184571B - Ejector type reverse circulation reamer and system for horizontal directional drilling - Google Patents
Ejector type reverse circulation reamer and system for horizontal directional drilling Download PDFInfo
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- CN109184571B CN109184571B CN201811360548.1A CN201811360548A CN109184571B CN 109184571 B CN109184571 B CN 109184571B CN 201811360548 A CN201811360548 A CN 201811360548A CN 109184571 B CN109184571 B CN 109184571B
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- 230000002441 reversible effect Effects 0.000 title claims abstract description 51
- 238000005553 drilling Methods 0.000 title claims description 77
- 239000002893 slag Substances 0.000 claims abstract description 35
- 238000004140 cleaning Methods 0.000 claims abstract description 26
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 239000007921 spray Substances 0.000 claims abstract description 21
- 238000009792 diffusion process Methods 0.000 claims abstract description 15
- 230000002829 reductive effect Effects 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 10
- 239000011435 rock Substances 0.000 description 48
- 239000002689 soil Substances 0.000 description 9
- 238000005520 cutting process Methods 0.000 description 8
- 230000005012 migration Effects 0.000 description 8
- 238000013508 migration Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241001061076 Melanonus zugmayeri Species 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
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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
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/28—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with non-expansible roller cutters
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
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- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides an ejector type reverse circulation reamer and a system for a horizontal directional drill, which comprise a body, a plurality of roller bit heads annularly arranged on the body, an expanding section arranged at the front end of the body and a diffusion pipe arranged at the rear end of the body, wherein the front end of the expanding section is provided with a reamer head, the reamer head is used for being forwards connected with a slurry pump through a drill rod, the diffusion pipe is used for being backwards connected with a mud tank at an earth outlet end through another drill rod, a plurality of cleaning spray holes which are communicated with the outside and are aligned with the roller bit one by one are annularly arranged on the side wall of the expanding section, the rear end of the expanding section is provided with a nozzle, a plurality of slag suction holes communicated with the outside are arranged between the expanding section and the body, a mixing pipe communicated with the diffusion pipe is arranged in the body, and the slag suction holes and the nozzle are communicated with the mixing pipe.
Description
Technical Field
The invention relates to the technical field of horizontal directional drilling, in particular to an ejector type reverse circulation reamer for the horizontal directional drilling.
Background
In recent years, in the national key pipeline construction projects of west gas and east gas transmission, east gas and east gas transmission and the like, the construction of large-diameter pipelines is gradually increased, and the horizontal directional drilling technology is increasingly widely used for the large-diameter pipeline laying project. The current large-caliber horizontal directional drilling and reaming construction generally adopts positive circulation reaming, namely when the reamer crushes rocks, high-pressure slurry pumped by the earth surface through a drill rod enters a drilled hole through a water hole of the reamer, and the drilled cuttings are washed away from a crushing surface and carried to return to an earth surface slurry pool along an annular space between the drilled hole and the drill rod after the reamer is cleaned, cooled and lubricated. When the horizontal directional drilling is used for forward circulation hole expansion, the diameter of a drilled hole is increased along with the increase of the diameter of a laid pipeline, and the flow rate of annular mud is remarkably reduced. Under the low annular mud velocity of flow, reaming detritus is easily deposited and is formed the detritus bed in drilling bottom, sharply reduces detritus migration efficiency. Rock debris accumulation can cause accidents such as breakage of a drill rod due to overlarge torque, damage to a pipeline due to overlarge back-dragging force and the like, the construction period is seriously influenced, and the construction cost is increased.
Compared with a traditional mud forward circulation mode, the reverse circulation technology changes the mud circulation direction, mud carrying rock debris enters the drill rod from the annular space and then returns to the ground surface, the rock debris migration efficiency can be greatly improved, and accumulation of the annular rock debris at the bottom of a drill hole is reduced. The reverse circulation technology is successfully applied to the fields of oil drilling, hydrographic water well drilling, rock core drilling, pile foundation engineering and the like, generates good economic benefit, but is not applied to the field of horizontal directional drilling. Therefore, the research and design of the reverse circulation reamer for the horizontal directional drilling is very important for promoting the application of the reverse circulation technology in the field of the horizontal directional drilling and improving the hole-enlarging construction efficiency of the horizontal directional drilling.
Disclosure of Invention
in view of the above, embodiments of the present invention provide an injector-type reverse circulation reamer and a system for horizontal directional drilling.
The embodiment of the invention provides an ejector type reverse circulation reamer for a horizontal directional drill, which comprises a body, a plurality of roller bit bits annularly arranged on the body, an expanding section arranged at the front end of the body and a diffusion pipe arranged at the rear end of the body, wherein the front end of the expanding section is provided with a reamer head, the reamer head is used for being forwards connected with a slurry pump through a drill rod, the diffusion pipe is used for being backwards connected with a mud pit at an earth outlet end through another drill rod, a plurality of cleaning spray holes which are communicated with the outside and are aligned with the roller bit bits one by one are annularly arranged on the side wall of the expanding section, a nozzle is arranged at the rear end of the expanding section, a plurality of slag suction holes communicated with the outside are arranged between the expanding section and the body, a mixing pipe communicated with the diffusion pipe is arranged in the body, and the slag suction holes and the nozzle are communicated with the mixing pipe.
Furthermore, the front end of the body is concavely provided with a suction chamber backwards, the suction chamber is communicated with the mixing pipe, the nozzle extends backwards into the suction chamber, and the slag suction hole is communicated with the mixing pipe through being communicated with the suction chamber.
Furthermore, a circle of buffer part is arranged between the diameter expanding section and the body, all the slag suction holes are connected with the buffer part, and the buffer part is positioned at the inclined front end of the slag suction holes; the buffer part comprises a sunken part which is recessed inwards from the surface of the diameter expansion section, and the bottom of the sunken part is arc-shaped.
furthermore, the suction chamber comprises a cylindrical section and a frustum section which are arranged in front and at the back and are connected with each other, the nozzle penetrates through the cylindrical section and extends into the frustum section, the tail end of the frustum section is connected with the mixing pipe, and the slag suction hole is communicated with the cylindrical section.
Furthermore, the nozzle is of a frustum structure with a gradually contracted front-to-back caliber, the diameters of all positions of the cleaning spray holes are the same, the cleaning spray holes are inclined backwards relative to the axis of the diameter-expanded section, the slag suction holes are inclined forwards relative to the axis of the diameter-expanded section, and the cleaning spray holes and the slag suction holes which correspond to each other form a splayed shape; the aperture of each part of the slag suction hole is the same, the aperture of each part of the mixing pipe is also the same, and the aperture of the slag suction hole is smaller than the pipe diameter of the mixing pipe; the diffuser pipe is of a frustum structure with the caliber gradually increasing from front to back.
Further, the body comprises an even portion with even circumference and a gradual change portion with gradually changed circumference, the even portion and the gradual change portion are arranged in front and at back and are connected with each other, the outer diameter of the gradual change portion is gradually reduced from front to back, the edge of the front end of the even portion is inclined backwards, the roller bits are uniformly distributed on the edge, the roller bits are of a conical structure, the bottom surface of each roller bit is parallel to the edge, the outermost side of the bottom surface of each roller bit is flush with the circumference of the even portion, and the tail end of the gradual change portion is connected with the diffusion pipe.
Furthermore, the diameter expanding section is provided with a thickened side wall, the cleaning spray holes penetrate through the thickened side wall to be communicated with the outside and the inside of the diameter expanding section, the inner diameter of the head of the reamer is the same as that of the diameter expanding section, the outer diameter of the diameter expanding section is larger than that of the head of the reamer and is smaller than that of the uniform part, the diameter expanding section and the head of the reamer are integrally formed, and the uniform part, the gradual change part and the diffusion pipe are integrally formed.
Further, the reamer head, the expanding section, the nozzle, the mixing tube, and the diffuser tube are coaxial.
The ejector type reverse circulation reaming system for the horizontal directional drilling comprises the ejector type reverse circulation reamer for the horizontal directional drilling, a drilling hole, a mud pump and a horizontal directional drilling machine connected with the mud pump through a high-pressure rubber pipe, wherein the mud pump is used for extracting working mud, the ejector type reverse circulation reamer for the horizontal directional drilling is located in the drilling hole, one end, close to the horizontal directional drilling machine, of the drilling hole is provided with a mud pit at an earth inlet end used for providing annular mud, one end, far away from the horizontal directional drilling machine, of the drilling hole is provided with a mud pit at an earth outlet end used for recovering the working mud, the front end of the ejector type reverse circulation reamer for the horizontal directional drilling is connected with the horizontal directional drilling machine through a drill rod, and the rear end of the ejector type reverse circulation reamer for the horizontal directional drilling is connected with the mud pit at the earth outlet end through another drill rod.
Further, the diameter of the expanded diameter section is smaller than the diameter of the borehole to be reamed.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
(1) According to the ejector type reverse circulation reamer and the system for the horizontal directional drilling, rock debris generated by cutting of the roller bit returns to the soil end mud pit on the ground surface through the drill rod connected with the rear end of the ejector type reverse circulation reamer for the horizontal directional drilling, and as the diameter of the drill rod is far smaller than the diameter of a drill hole, mud carrying the rock debris can easily obtain high flow velocity in the drill rod, so that large-particle rock debris is easy to discharge, accumulation of annular rock debris at the bottom of the drill hole is reduced, the rock debris migration efficiency is greatly improved, and the problems of low annular mud flow velocity and rock debris deposition of the large-diameter horizontal directional drilling are solved.
(2) According to the ejector type reverse circulation reamer and the ejector type reverse circulation reamer system for the horizontal directional drilling, rock debris generated by reaming is discharged through the drill rod connected with the rear end of the ejector type reverse circulation reamer for the horizontal directional drilling, and due to the fact that the diameter of the drill rod is small, the flow speed of slurry carrying the rock debris in the drill rod is high, the requirement of the slurry on the slurry suspension performance is lowered, and the requirement on the slurry performance is low.
(3) The diameter of the diameter expanding section of the ejector type reverse circulation reamer and the system for the horizontal directional drilling is larger but smaller than the diameter of the drilled hole to be reamed, so that the energy loss of jet flow of a cleaning jet hole in an annular space can be effectively reduced, the cleaning effect of a drill bit is enhanced, the possibility of migration of cutting rock debris to the annular space can be reduced, the rock debris generated by cutting is sealed between the diameter expanding section and the body to a certain extent, the rock debris is sucked by the slag suction hole and enters the annular reamer, and the annular rock debris migration efficiency is improved.
Drawings
FIG. 1 is a schematic view of an injector-type reverse circulation reamer for horizontal directional drilling according to the present invention;
Fig. 2 is a schematic diagram of an ejector type reverse circulation reaming system for horizontal directional drilling according to the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 and 2, an embodiment of the present invention provides an injector type reverse circulation reamer 6 for horizontal directional drilling, which is used for reaming a drilled hole, and mainly includes a body 20, a plurality of roller bits 12 annularly disposed on the body 20, an expanding section 11 disposed at a front end of the body 20, and a diffuser 18 disposed at a rear end of the body 20. The roller cone drill bit 12 is used to cut rock and soil during a reaming process, and rock debris is generated during the cutting of rock and soil. The front end of the expanding section 11 is provided with a reamer head 9, the reamer head 9 is used for being connected with the mud pump 1 through a drill rod 5 in a forward direction, and the diffusion pipe 18 is used for being connected with the mud pit 8 at the soil discharging end through another drill rod 7 in a backward direction.
Referring to fig. 1, the internal diameter of the reamer head 9 is the same as the internal diameter of the expanded diameter section 11, the expanded diameter section 11 has a thickened side wall 19 such that the external diameter of the expanded diameter section 11 is greater than the external diameter of the reamer head 9, and the outer surface of the thickened side wall 19 is arcuately connected to the outer surface of the reamer head 9.
The cleaning spray holes 10 penetrate through the thickened side wall 19 and are communicated with the outside and the inside of the diameter expanding section 11, the hole diameters of all the cleaning spray holes 10 are the same, and the cleaning spray holes 10 are inclined backwards relative to the axis of the diameter expanding section 11. The rear end of the diameter-expanding 11 section is provided with a nozzle, the nozzle comprises a nozzle contraction section 14 and a nozzle part 15 which are arranged in front and back and connected with each other, the nozzle contraction section 14 is of a frustum structure with a gradually contracting caliber from front to back, and the nozzle part 15 is located at the tail end of the nozzle contraction section 14 and is of a circular ring structure.
The longitudinal section of the body 20 is approximately arrow tail shape, and comprises an even portion 21 with even circumference and a gradual change portion 22 with gradually changed circumference, wherein the even portion 21 and the gradual change portion 22 are arranged in front and at back and are connected with each other. The gradually changing portion 22 is a truncated cone structure with an outer diameter gradually decreasing from front to back, and the tail end of the gradually changing portion 22 is connected with the diffuser 18. The outer diameter of the uniform part 21 is the same everywhere, the middle area of the front end of the uniform part 21 is recessed backwards to form a recessed space, the edge 23 of the front end of the uniform part 21 is inclined backwards, the surface of the edge 23 is flat and surrounds the periphery of the recessed space, the roller bits 12 are uniformly distributed on the edge 23, the roller bits 12 are of a conical structure, the bottom surface of each roller bit 12 is parallel to the edge 23, the outermost side of the bottom surface of each roller bit 12 is flush with the circumference of the uniform part 21, a mixing pipe 17 is arranged in the body 20, the mixing pipe 17 penetrates through the uniform part 21 and the gradual change part 22, is communicated with the diffusion pipe 18 and is communicated with the nozzle. The rear half part of the diameter expanding section 11 is located in the recessed space, a plurality of slag sucking holes 13 communicated with the outside are formed between the rear end of the diameter expanding section 11 and the front wall of the recessed space, a sucking chamber 16 is arranged in the central area of the recessed space, the sucking chamber 16 comprises a cylindrical section and a frustum section which are arranged in the front and at the back and are mutually connected, the mouth part 15 penetrates through the cylindrical section to extend into the frustum section, the tail end of the frustum section is connected and communicated with the mixing pipe 17, and the slag sucking holes 13 are communicated with the mixing pipe 17 through being communicated with the cylindrical section.
A circle of buffer part is arranged between the diameter expanding section 11 and the body 20, all the slag suction holes 13 are connected with the buffer part, and the buffer part is positioned at the inclined front end of the slag suction holes 13. The buffer part comprises a concave part which is recessed inwards from the surface of the diameter expanding section 11, and the bottom of the concave part is arc-shaped. The volume of the buffer part is larger than or equal to that of each slag suction hole 13, and the buffer part is used for guiding outside annular slurry, working slurry sprayed from the cleaning spray holes 10 and rock debris cut by the roller bit 12 into the slag suction holes 13 and has a certain buffer effect. The nozzle 15 is used for injecting high-pressure working slurry into the suction chamber 16 at a high speed so as to achieve a low pressure in the suction chamber 16, so that the suction chamber 16 has a suction effect under the action of a pressure difference, slurry and rock debris in the slag suction hole 13 can be sucked and transferred into the mixing pipe 17, the working slurry, annular slurry and rock debris are fully mixed in the mixing pipe 17 to form a rock debris-slurry mixed medium, and the diffuser pipe 18 is of a frustum structure with an inner diameter gradually reduced from front to back, so that partial kinetic energy of the rock debris-slurry mixed medium can be converted into pressure energy to press out the rock debris-slurry mixed medium.
The cleaning spray holes 10 are aligned with the roller bit 12 one by one, the roller bit 12 is positioned at the outer side of the corresponding cleaning spray hole 10, the slag suction hole 13 inclines forwards relative to the axis of the diameter expanding section 11, the cleaning spray holes 10 and the slag suction hole 13 which correspond to each other form a splay shape, a part of the working slurry in the diameter expanding section 11 is sprayed out from the cleaning spray holes 10 aligned with the corresponding roller bit 12 and used for washing and cooling the roller bit 12, and the rest part of the working slurry is sprayed into the suction chamber 16 from the mouth part 15 at a high speed and used for enabling the suction chamber 16 to generate low pressure. The aperture of each part of the slag suction hole 13 is the same, the aperture of each part of the mixing pipe 17 is also the same, and the aperture of the slag suction hole 13 is smaller than the pipe diameter of the mixing pipe 17, so that the rock debris is prevented from bridging and blocking in the mixing pipe 17, and a flow channel is provided for the annular mud carrying the rock debris to enter the reamer.
The diameter expanding section 11 is integrally formed with the reamer head 9, and the uniform section 21, the gradual change section 22 and the diffuser 18 are integrally formed. The reamer head 9, the expanding section 11, the nozzle, the mixing tube 17 and the diffuser 18 are coaxial.
Referring to fig. 2, an embodiment of the present invention provides an injector type reverse circulation reaming system for horizontal directional drilling, including the above injector type reverse circulation reamer 6 for horizontal directional drilling, further including a drilling hole, a mud pump 1 and a horizontal directional drilling machine 3 connected to the mud pump 1 through a high pressure rubber pipe 2, the mud pump 1 is used for pumping working mud, the ejector type reverse circulation reamer 6 for the horizontal directional drilling is positioned in the drilling hole, an earth-entering end mud pit 4 for providing annular mud is arranged at one end of the drilling hole close to the horizontal directional drilling machine 3, an earth-exiting end mud pit 8 for recovering the working mud is arranged at one end far away from the horizontal directional drilling machine 3, the front end of the ejector type reverse circulation reamer 6 for the horizontal directional drilling is connected with the horizontal directional drilling machine 3 through a drill rod 5, and the rear end of the ejector type reverse circulation reamer is connected with the mud pit 8 at the soil outlet end through another drill rod 7.
The diameter of the diameter expanding section 11 is smaller than that of the drilled hole to be reamed, and the main purpose of the diameter expanding section is to reduce energy loss of working slurry in an annular space after the working slurry is sprayed from the cleaning spray holes 10, so that flushing and cooling effects on the roller bit 12 are enhanced.
And the mud pump 1 is arranged at the soil entering end of the drilled hole, the mud pump 1 pumps high-pressure working mud into a circulation loop, and the high-pressure working mud is pumped into the ejector type reverse circulation reamer 6 for the horizontal directional drilling through the high-pressure rubber pipe 2 and the horizontal directional drilling machine 3 and through a drill rod 5 connected with the front end of the ejector type reverse circulation reamer 6 for the horizontal directional drilling. Part of the high-pressure working mud flows to the roller bit 12 at a high speed after passing through the cleaning spray holes 10, and part of rock debris carried by the part of the working mud enters the suction chamber 16 through the slag suction holes 13 after the roller bit 12 is cleaned and cooled. Part of the high-pressure working mud is ejected at high velocity through the nozzle constriction 14 at the mouth 15, creating a low pressure in the suction chamber 16. Under the action of the internal and external pressure difference, mud in the mud pit 4 at the soil inlet end passes through the annular space and then passes through the diameter expanding section 11, and then carries rock debris to enter the suction chamber 16 through the debris suction hole 13. The rock debris and the mud entering the mixing pipe 17 are fully mixed in the mixing pipe 17 to form a rock debris-mud mixed medium, partial kinetic energy of the rock debris-mud mixed medium is converted into pressure energy in the diffusion pipe 18, and then the rock debris-mud mixed medium enters the drill rod 7 connected with the rear end of the ejector type reverse circulation reamer 6 for the horizontal directional drilling, so that the rock debris and the mud return to the mud pit 8 at the soil outlet end, and reaming reverse circulation is realized.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
(1) According to the ejector type reverse circulation reamer and the system for the horizontal directional drilling, rock debris generated by cutting of the roller bit 12 returns to the soil end mud pit 8 on the earth surface through the drill rod 7 connected with the rear end of the ejector type reverse circulation reamer 6 for the horizontal directional drilling, and as the diameter of the drill rod 7 is far smaller than the diameter of a drilled hole, mud carrying the rock debris can easily obtain high flow velocity in the drill rod 7, large-particle rock debris is easy to discharge, accumulation of annular rock debris at the bottom of the drilled hole is reduced, the rock debris migration efficiency is greatly improved, and the problems of low annular mud flow velocity and rock debris deposition of the large-diameter horizontal directional drilling are solved.
(2) According to the ejector type reverse circulation reamer and the ejector type reverse circulation reamer system for the horizontal directional drilling, rock debris generated by reaming is discharged through the drill rod 7 connected with the rear end of the ejector type reverse circulation reamer 6 for the horizontal directional drilling, and as the drill rod 7 is small in diameter, mud carrying the rock debris is high in flow speed in the drill rod 7, the requirement of the mud on the mud suspension performance is reduced, and the requirement on the mud performance is low.
(3) According to the injector type reverse circulation reamer for the horizontal directional drilling and the system, the diameter of the diameter expansion section 11 is larger but smaller than that of the drilled hole to be reamed, so that the energy loss of jet flow of a cleaning jet hole in an annular space can be effectively reduced, the cleaning effect of a drill bit 12 is enhanced, the possibility of migration of cutting rock debris to the annular space can be reduced, the rock debris generated by cutting is sealed between the diameter expansion section 11 and the body 20 to a certain extent, the rock debris is sucked by the slag suction hole 13 and enters the reamer 6, and the migration efficiency of the annular rock debris is improved.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a horizontal directional drilling is with ejector type reverse circulation enlarger which characterized in that: the cone bit comprises a body, a plurality of cone bits annularly arranged on the body, an expanding section arranged at the front end of the body and a diffusion pipe arranged at the rear end of the body, wherein the body comprises an even part with even circumference and a gradually-changed part with gradually-changed circumference, the even part and the gradually-changed part are arranged in front and at the back and are mutually connected, the outer diameter of the gradually-changed part is gradually reduced from front to back, the front end edge of the even part is inclined backwards, the cone bits are uniformly distributed on the edge, the cone bits are in a cone structure, the bottom surface of each cone bit is parallel to the edge, the outermost side of the bottom surface of each cone bit is flush with the circumference of the even part, the tail end of the gradually-changed part is connected with the diffusion pipe, the front end of the expanding section is provided with a reamer head, the reamer head is used for being connected with a slurry pump forwards through a drill rod, and the diffusion pipe is used for being connected, the cone bit cleaning device is characterized in that a plurality of cleaning spray holes which are communicated with the outside and are aligned with the cone bit one by one are annularly arranged on the side wall of the diameter expanding section, the diameter expanding section is provided with a thickened side wall, the cleaning spray holes penetrate through the thickened side wall and are communicated with the outside and the inside of the diameter expanding section, the inner diameter of the head of the reamer is the same as that of the diameter expanding section, the outer diameter of the diameter expanding section is larger than that of the head of the reamer and is smaller than that of the uniform part, the diameter expanding section and the head of the reamer are integrally formed, the uniform part, the gradual change part and the diffusion pipe are integrally formed, a nozzle is arranged at the rear end of the diameter expanding section, a plurality of slag suction holes which are communicated with the outside are arranged between the diameter expanding section and the body, a mixing pipe which is communicated with.
2. The injector-type reverse circulation reamer for horizontal directional drilling according to claim 1, wherein: the front end of the body is concavely provided with a suction chamber backwards, the suction chamber is communicated with the mixing pipe, the nozzle extends backwards into the suction chamber, and the slag suction hole is communicated with the mixing pipe through being communicated with the suction chamber.
3. The injector-type reverse circulation reamer for horizontal directional drilling according to claim 2, wherein: a circle of buffer part is arranged between the diameter expanding section and the body, all the slag suction holes are connected with the buffer part, and the buffer part is positioned at the inclined front end of the slag suction holes; the buffer part comprises a sunken part which is recessed inwards from the surface of the diameter expansion section, and the bottom of the sunken part is arc-shaped.
4. The injector-type reverse circulation reamer for horizontal directional drilling according to claim 2, wherein: the suction chamber comprises a cylindrical section and a frustum section which are arranged in the front and back and are connected with each other, the nozzle penetrates through the cylindrical section and extends into the frustum section, the tail end of the frustum section is connected with the mixing pipe, and the slag suction hole is communicated with the cylindrical section.
5. The injector-type reverse circulation reamer for horizontal directional drilling according to claim 1, wherein: the nozzle is of a frustum structure with the caliber gradually shrinking from front to back, the aperture of each cleaning spray hole is the same, the cleaning spray hole inclines backwards relative to the axis of the diameter expanding section, the slag suction hole inclines forwards relative to the axis of the diameter expanding section, and the cleaning spray hole and the slag suction hole which correspond to each other form a splayed shape; the aperture of each part of the slag suction hole is the same, the aperture of each part of the mixing pipe is also the same, and the aperture of the slag suction hole is smaller than the pipe diameter of the mixing pipe; the diffuser pipe is of a frustum structure with the caliber gradually increasing from front to back.
6. The injector-type reverse circulation reamer for horizontal directional drilling according to claim 1, wherein: the reamer head, the expanding section, the nozzle, the mixing tube and the diffuser tube are coaxial.
7. The utility model provides a directional boring ejector type reverse circulation reaming system that uses of level which characterized in that: the ejector reverse circulation reamer for the horizontal directional drilling comprises a drilling hole, a mud pump and a horizontal directional drilling machine, wherein the drilling hole is connected with the mud pump through a high-pressure rubber pipe, the mud pump is used for extracting working mud, the ejector reverse circulation reamer for the horizontal directional drilling is positioned in the drilling hole, an earth entering end mud pit for providing annular mud is arranged at one end of the drilling hole close to the horizontal directional drilling machine, an earth outlet end mud pit for recovering the working mud is arranged at one end far away from the horizontal directional drilling machine, the front end of the ejector reverse circulation reamer for the horizontal directional drilling is connected with the horizontal directional drilling machine through a drill rod, and the rear end of the ejector reverse circulation reamer for the horizontal directional drilling is connected with the earth outlet end mud pit through another drill rod.
8. The ejector type reverse circulation reaming system for the horizontal directional drill according to claim 7, wherein: the diameter of the expanded diameter section is smaller than the diameter of the borehole to be reamed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN201811360548.1A CN109184571B (en) | 2018-11-15 | 2018-11-15 | Ejector type reverse circulation reamer and system for horizontal directional drilling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111852336B (en) * | 2020-08-27 | 2021-10-29 | 安徽建筑大学 | Drilling tool for horizontal directional drilling and reaming |
| CN112647880A (en) * | 2020-12-23 | 2021-04-13 | 中国地质大学（武汉） | Reverse circulation continuous non-integral coring method for horizontal directional drilling investigation |
| CN114278230A (en) * | 2021-12-30 | 2022-04-05 | 库尔勒施得石油技术服务有限公司 | Reverse circulation drill bit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4448269A (en) * | 1981-10-27 | 1984-05-15 | Hitachi Construction Machinery Co., Ltd. | Cutter head for pit-boring machine |
| EP0960254A1 (en) * | 1997-01-28 | 1999-12-01 | Ardis L. Holte | Reverse circulation drilling system with bit locked underreamer arms |
| WO2000052377A1 (en) * | 1998-01-21 | 2000-09-08 | Holte Ardis L | Reverse circulation drilling system with hexagonal pipe coupling |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003145B (en) * | 2010-10-20 | 2012-11-28 | 中国地质大学（武汉） | Hole driven type horizontal directional drilling reverse circulation hole dilating drill |
| CN102003140B (en) * | 2010-10-20 | 2012-10-17 | 中国地质大学（武汉） | Traversing reverse circulating drilling method of horizontal directional drilling pipeline and special drilling bit |
| CN103527092B (en) * | 2013-10-25 | 2015-10-14 | 中国地质大学（武汉） | Suction bits expanding method is penetrated in horizontal orientation boring |
| CN103527093B (en) * | 2013-10-25 | 2015-07-22 | 武汉中地管通非开挖科技有限公司 | Jet-suction type reverse-circulation reamer for crossing of horizontal directional drilling |
| CN205605119U (en) * | 2016-05-04 | 2016-09-28 | 廊坊华元机电工程有限公司 | Pass through reducing enlarger for pipeline |
| CN207879247U (en) * | 2018-02-08 | 2018-09-18 | 佘翀 | It combines reducing and sprays Pump breath countercirculate boundling down-hole hammer |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4448269A (en) * | 1981-10-27 | 1984-05-15 | Hitachi Construction Machinery Co., Ltd. | Cutter head for pit-boring machine |
| EP0960254A1 (en) * | 1997-01-28 | 1999-12-01 | Ardis L. Holte | Reverse circulation drilling system with bit locked underreamer arms |
| WO2000052377A1 (en) * | 1998-01-21 | 2000-09-08 | Holte Ardis L | Reverse circulation drilling system with hexagonal pipe coupling |
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