CN109025831B - Hybrid PDC drill bit based on jet technology - Google Patents
Hybrid PDC drill bit based on jet technology Download PDFInfo
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- CN109025831B CN109025831B CN201811056685.6A CN201811056685A CN109025831B CN 109025831 B CN109025831 B CN 109025831B CN 201811056685 A CN201811056685 A CN 201811056685A CN 109025831 B CN109025831 B CN 109025831B
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- radial bearing
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- 238000005516 engineering process Methods 0.000 title claims abstract description 29
- 238000005553 drilling Methods 0.000 claims abstract description 68
- 239000012530 fluid Substances 0.000 claims abstract description 57
- 239000011435 rock Substances 0.000 claims abstract description 45
- 239000000956 alloy Substances 0.000 claims description 23
- 229910045601 alloy Inorganic materials 0.000 claims description 23
- 230000002441 reversible effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 10
- 238000005406 washing Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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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
- E21B10/42—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
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
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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
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/61—Drill bits characterised by conduits or nozzles for drilling fluids characterised by the nozzle structure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- 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 relates to a hybrid PDC drill bit based on a jet technology, which comprises a drill bit body, wherein one end of the drill bit body is provided with a plurality of drilling fluid nozzles, one end of the drill bit body is provided with at least two drill bit blades which can rotate along the drill bit body in the same direction to mechanically cut a rock stratum, one end of the drill bit body is provided with at least two jet power cutter bits, the jet power cutter bits and the drill bit blades are uniformly and alternately arranged along the circumferential direction, the jet power cutter bits are uniformly and alternately arranged along the circumferential direction, one side of each cutter bit blade is respectively provided with a jet nozzle, the jet power cutter bits can rotate along the same direction of the drill bit body and can reversely rotate under the pushing of high-pressure jet, and each cutter bit blade can secondarily impact and grind the rock stratum and the high-pressure jet generated by the jet nozzles can. The drill bit can realize mechanical and hydraulic crossed rock breaking under complex and changeable strata, improves the adaptability of the drill bit to various strata, improves the rock breaking efficiency, shortens the drilling period, reduces the drilling cost and improves the exploration and development benefits.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to a hybrid PDC drill bit based on a jet technology.
Background
With the increasing of the strength of oil exploration and development, the drilling workload of various complicated geological formations under the well shows a trend of rising year by year. However, many problems are encountered in the process of drilling the complicated and variable rock strata, and due to the fact that the rock strata have the changeable complexity, a drill bit aiming at a specific rock stratum cannot be well adapted to the changeable rock strata in the drilling process, so that the fluctuation of the rock breaking effect is caused, the drilling period is prolonged, and the abrasion of the drill bit is accelerated. Therefore, the construction period is delayed, the drilling cost is increased, a new drilling technology is urgently needed to improve the drilling speed, shorten the drilling period and improve the exploration and development benefits.
Therefore, the inventor provides a hybrid PDC drill bit based on the jet technology by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide a hybrid PDC drill bit based on a jet technology, which solves the problems of poor drill bit adaptability, long drilling period, limited drilling speed, high drilling cost and the like in a complex stratum in the prior art.
The invention aims to realize the purpose, and the hybrid PDC drill bit based on the jet technology comprises a drill bit body, wherein a drilling fluid channel hole is axially arranged in the drill bit body, at least 4 drilling fluid nozzles communicated with the drilling fluid channel hole are arranged at one end of the drill bit body, at least two drill bit blades are radially and symmetrically arranged at one end of the drill bit body, the drill bit blades can rotate along the drill bit body in the same direction to mechanically cut a rock stratum, at least two jet power cutter heads are radially and symmetrically arranged at one end of the drill bit body, the number of the jet power cutter heads and the number of the drill bit blades are the same, the jet power cutter heads and the drill bit blades are uniformly staggered in the circumferential direction, a plurality of cutter head blades are uniformly arranged on the jet power cutter heads at intervals in the circumferential direction, and jet nozzles capable of generating high-pressure jet are respectively arranged on one side of each cutter head blade in the circumferential direction of the jet power cutter head, the jet power cutter head can rotate along with the drill bit body in the same direction and can rotate reversely under the pushing of high-pressure jet, and each cutter head blade can secondarily impact and grind a rock stratum and the high-pressure jet generated by the jet nozzle can jet and crush the rock stratum.
In a preferred embodiment of the present invention, a plurality of side tapered teeth are provided on an outer side wall of each of the cutter head blades in a radial direction of the jet power cutter head, a wedge-shaped tooth group is provided on an end surface of each of the cutter head blades on the same side in a circumferential direction of the jet power cutter head, and an end tapered tooth is provided on the wedge-shaped tooth group on the side in the circumferential direction of the jet power cutter head.
In a preferred embodiment of the present invention, the wedge-shaped tooth group includes a plurality of wedge-shaped teeth arranged at intervals in the radial direction, the number of end cone-shaped teeth on two radially symmetrical cutter head blades is the same, and the number of wedge-shaped teeth on two cutter head blades is the same.
In a preferred embodiment of the present invention, a drilling fluid passage hole is axially provided in the drill body, and the injection angle of each of the jet nozzles is adjustable, and each of the jet nozzles is capable of communicating with the drilling fluid passage hole.
In a preferred embodiment of the present invention, the number of the drill blades is 2, the number of the jet power cutter heads is 2, a drilling fluid channel hole is axially disposed in the drill body, 4 drilling fluid nozzles communicating with the drilling fluid channel hole are disposed at one end of the drill body, one drill blade and an adjacent jet power cutter head are set to form a cutting group, one end of the drill body is disposed between the drill blade and the jet power cutter head in each cutting group, the drilling fluid nozzle is disposed at one end of the drill body at a position of a chip groove of the drill blade in each cutting group, and the drilling fluid nozzles are uniformly spaced in the circumferential direction.
In a preferred embodiment of the present invention, a drilling fluid channel hole is axially disposed in the drill bit body, a jet flow passage hole capable of communicating with the drilling fluid channel hole is axially disposed in each jet power cutter head, and each jet nozzle is disposed in communication with the jet flow passage hole.
In a preferred embodiment of the present invention, a plurality of radially and symmetrically arranged mounting holes are formed in one end of the drill body from the end portion to the inside, a hollow rotary connection structure is rotatably mounted in each mounting hole, one end of each rotary connection structure can be detachably connected to one jet power cutter head, and a jet channel hole of the jet power cutter head is communicated with the drilling fluid channel hole through an inner cavity of the rotary connection structure.
In a preferred embodiment of the present invention, the rotational connection structure includes a first cemented carbide radial bearing, a thrust bearing set, and a second cemented carbide radial bearing sequentially sleeved in the mounting hole, a connection shaft is rotatably sleeved in the first cemented carbide radial bearing, the thrust bearing set, and the second cemented carbide radial bearing, a fluid passage hole capable of communicating with the jet flow passage hole and the drilling fluid passage hole is axially disposed in the connection shaft, and one end of the fluid passage hole is in sealed communication with the jet power cutter head.
In a preferred embodiment of the present invention, the opening end of the mounting hole is provided with a first step portion with an increasing diameter, and the mounting hole is internally provided with a second step portion and a third step portion with a decreasing diameter at intervals along the axial direction;
one end of the outer ring of the first hard alloy radial bearing is provided with a first convex ring part with the diameter being increased, the end face of the first convex ring part abuts against the first step part and is fixedly connected to the first step part, and the inner ring of the first hard alloy radial bearing is sleeved on the connecting shaft; one end of the outer ring of the second hard alloy radial bearing is provided with a second convex ring part with the diameter being increased, the end face of the second convex ring part abuts against the third step part and is fixedly connected to the third step part, and the inner ring of the second hard alloy radial bearing is sleeved on the connecting shaft; the outer ring of the thrust bearing group is sleeved in the mounting hole, two ends of the outer ring of the thrust bearing group are axially abutted against the outer ring of the first hard alloy radial bearing and the second step part, and the inner ring of the thrust bearing group is sleeved on the connecting shaft; a first axial check ring is sleeved on the connecting shaft between the first hard alloy radial bearing and the thrust bearing group, and the first axial check ring can axially stop the inner ring of the first hard alloy radial bearing; a second axial check ring is sleeved on the connecting shaft between the thrust bearing group and the second hard alloy radial bearing and can axially stop the inner ring of the second hard alloy radial bearing; and a shaft end baffle ring is sleeved on the outer wall of one end of the connecting shaft, which is far away from the jet power tool bit.
In a preferred embodiment of the present invention, the connecting shaft is provided with a first clamping groove, a second clamping groove and a third clamping groove, the first axial retaining ring is clamped in the first clamping groove, the second axial retaining ring is clamped in the second clamping groove, and the shaft end retaining ring is clamped in the third clamping groove.
From the above, the hybrid PDC drill bit based on the jet technology has the following beneficial effects:
according to the hybrid PDC drill bit based on the jet technology, staggered cutting, grinding and jet impact are performed on rock strata with different characteristics, the drill bit blades rotate along the drill bit body in the same direction to mechanically cut the rock strata to form vortex-shaped groove marks, the jet power tool bit uses the reaction force of high-pressure jet as rotary power, the tool bit blades rotate in the reverse direction to secondarily impact and grind the rock strata along the direction perpendicular to the vortex-shaped groove marks, and meanwhile, the rotating high-pressure jet generates hydraulic impact crushing and efficient washing on the rock strata, so that mechanical and hydraulic crossed rock breaking in a complex stratum is realized, the adaptability of the drill bit to various strata is greatly improved, the rock breaking efficiency and the chip cleaning effect are improved, the drilling period is shortened, the service life of the drill bit is fundamentally prolonged, the drilling cost is reduced, and the exploration and development benefits are.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.
Wherein:
FIG. 1: is an isometric view of a hybrid PDC bit of the present invention based on jet technology.
FIG. 2: is a cross-sectional view of a hybrid PDC bit based on jet technology of the present invention.
FIG. 3: is an enlarged view at I in FIG. 2.
FIG. 4: is a bottom structure schematic diagram of the hybrid PDC drill bit based on the jet technology.
FIG. 5: the bottom structure of the hybrid PDC drill bit based on the jet technology is schematically shown after a jet power cutter head is removed.
FIG. 6: is a schematic diagram of the jet power cutter head of the invention.
In the figure:
100. a hybrid PDC drill bit based on a jet technology;
1. a drill bit body;
10. a drilling fluid flow passage hole; 11. a drilling fluid nozzle;
121. a first step portion; 122. a second step portion; 123. a third step portion;
2. a drill blade;
3. a jet power cutter head;
30. a jet flow channel orifice;
31. a tool bit blade; 311. a side cone tooth; 312. wedge-shaped teeth; 313. an end cone tooth;
32. a jet nozzle;
33. a connecting shaft; 331. a fluid via;
41. a first cemented carbide radial bearing; 411. a first collar portion;
42. a second cemented carbide radial bearing; 421. a second collar portion;
43. a thrust bearing set;
44. a first axial retainer ring;
45. a second axial retainer ring;
46. a shaft end baffle ring;
5. and (7) a rubber pad.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
As shown in fig. 1 to 6, the present invention provides a hybrid PDC drill bit 100 based on a jet technology, which includes a drill bit body 1, wherein at least two drill bit blades 2 are radially and symmetrically disposed at one end of the drill bit body 1 (the arrangement and connection manner of the drill bit blades 2 is the prior art and is not described herein), the drill bit blades 2 can mechanically cut rock formations while rotating in the same direction as the drill bit body 1, at least two jet power cutter heads 3 are further radially and symmetrically disposed at one end of the drill bit body 1, the number of the jet power cutter heads 3 and the number of the drill bit blades 2 are the same, the jet power cutter heads 3 and the drill bit blades 2 are uniformly staggered in the circumferential direction, a plurality of cutter head blades 31 are uniformly spaced in the circumferential direction on the jet power cutter head 3, a high pressure jet can be generated on one side of each cutter head blade 31 in the circumferential direction of the jet power cutter head (the pressure of a fluid increases when, so-called high-pressure jet), the jet power tool bit can be along with the drill bit body syntropy turnover and can be in the high-pressure jet promotes down reverse (with drill bit body direction of rotation opposite, the drill bit body clockwise rotation promptly, then jet power tool bit can anticlockwise rotation) rotation, each jet nozzle 32 sets up respectively in the circumference one side of each tool bit wing 31 along the rotatory direction of advance of drill bit body to satisfy its high-pressure jet that produces and promote the reverse rotation of jet power tool bit. Each cutter blade 31 can perform secondary impact grinding on the rock stratum and the high-pressure jet generated by the jet nozzle can jet and crush the rock stratum.
In the hybrid PDC drill bit based on the jet technology, staggered cutting, grinding and jet impact are carried out on rock layers with different characteristics, the drill bit blades 2 form vortex-shaped groove marks along the rock layers cut by the drill bit body 1 in a same-direction rotating machine, the jet power tool bit 3 takes the reaction force of high-pressure jet as rotating power, the tool bit blades rotate reversely and impact and grind the rock layers along the direction perpendicular to the vortex-shaped groove marks for the second time, and meanwhile, the rotating high-pressure jet generates hydraulic impact crushing and efficient washing on the rock layers, so that mechanical and hydraulic crossed rock breaking in a complex stratum is realized, the adaptability of the drill bit to various strata is greatly improved, the rock breaking efficiency and the chip cleaning effect are improved, the drilling period is shortened, the service life of the drill bit is fundamentally prolonged, the drilling cost is reduced, and the exploration and development benefits are.
Further, as shown in fig. 6, a plurality of side tapered teeth 311 are provided on the outer side wall of each cutter blade 31 in the radial direction of the jet power cutter head, a wedge-shaped tooth group is provided on the same side of the end face of each cutter blade 31 in the circumferential direction of the jet power cutter head, and an end tapered tooth 313 is provided on one side of the wedge-shaped tooth group in the circumferential direction of the jet power cutter head. The end conical teeth 313 and the wedge-shaped tooth groups on the end surfaces of the cutter blades 31 can bear forces from different directions, and meanwhile impact grinding can be carried out on the rock in different directions; the side cone teeth 311 on the circumferential side wall of each cutter blade 31 can impact the surrounding area rock.
In this embodiment, the wedge tooth group includes a plurality of wedge teeth 312 arranged at intervals along the radial direction, the number of end tapered teeth 313 on two cutter head blades 31 which are symmetrical along the radial direction is the same, and the number of wedge teeth 312 on two cutter head blades 31 is the same, so as to ensure the stress balance of the jet power cutter head 3 and avoid damage.
Further, as shown in fig. 2 and 3, the drill body 1 is provided with the drilling fluid passage hole 10 along the axial direction, the jetting angle of the jet nozzles 32 can be adjusted, and each jet nozzle 32 can communicate with the drilling fluid passage hole 10. In a specific embodiment of the present invention, the number of the tool bit blades 31 and the number of the jet nozzles 32 are 4, the 4 jet nozzles 32 are uniformly arranged along the circumferential direction of the jet power tool bit 3, and the angle of the jet nozzles 32 is adjusted according to the requirement and the best effect, so as to meet the autorotation requirement and the rock stratum flushing requirement of the jet power tool bit 3. High-pressure drilling fluid carries out high-pressure jet through jet nozzle 32, and under 4 jet nozzle 32's effect, the circumference of efflux power tool bit 3 produces the broken rock of reverse high-speed torsion grinding, and rotatory high-pressure jet liquid had both carried out high-efficient washing to the drill bit bottom simultaneously, produced the broken effect of impact again to the rock.
Further, as shown in fig. 4 and 5, in an embodiment of the present invention, the number of the drill blades 2 is 2, the number of the jet power cutter heads 3 is 2, the drill flow channel hole 10 is axially disposed in the drill body 1, at least 4 drilling fluid nozzles 11 communicated with the drill flow channel hole 10 are disposed at one end of the drill body 1, one drill blade 2 and an adjacent one of the jet power cutter heads 3 are set to form a cutting group, a drilling fluid nozzle 11 is disposed at a position between the drill blade and the jet power cutter head in each cutting group at one end of the drill body 1, a drilling fluid nozzle 11 is disposed at a chip discharge slot of the drill blade 2 in each cutting group at one end of the drill body 1, and the drilling fluid nozzles 11 are uniformly spaced along the circumferential direction.
Further, as shown in fig. 2 and 3, a drilling fluid passage hole 10 is axially provided in the drill body 1, a jet flow passage hole 30 capable of communicating with the drilling fluid passage hole 10 is axially provided in each jet flow power cutter head 3, and each jet flow nozzle 32 is provided in communication with the jet flow passage hole 30.
Further, a plurality of mounting holes which are radially and symmetrically arranged are formed in one end of the drill bit body 1 from the end portion inwards, a hollow rotating connecting structure is respectively installed in each mounting hole in a rotating mode, one end of each rotating connecting structure can be detachably connected with a jet power cutter head 3, and a jet channel hole 30 of the jet power cutter head 3 is communicated with the drilling fluid channel hole 10 through an inner cavity of each rotating connecting structure. In this embodiment, the height of the sets of end cone teeth 313 and wedge teeth on the end face of each cutter blade 31 is about 2mm lower than the height of the drill blades 2 on the drill body 1, so that the weight on bit is mainly borne by the drill blades 2 on the drill body 1, thereby preventing premature failure of the rotary connection of the jet powered cutter head 3 to the drill body 1.
Further, as shown in fig. 2 and fig. 3, the rotary connection structure includes a first cemented carbide radial bearing 41 (may be referred to as a first TC bearing), a thrust bearing group 43, and a second cemented carbide radial bearing 42 (may be referred to as a first TC bearing) sequentially sleeved in the mounting hole, a connection shaft 33 is rotatably sleeved in the first cemented carbide radial bearing 41, the thrust bearing group 43, and the second cemented carbide radial bearing 42, a fluid through hole 331 capable of communicating with the jet flow passage hole 30 and the drilling fluid passage hole 10 is axially disposed in the connection shaft 33, and one end of the fluid through hole 331 is sealingly communicated with the jet power cutter head 3. In this embodiment, a tapered threaded hole is provided at one end of the fluid passing hole 331, and a tapered connection post capable of being connected in a sealing manner is provided on the jet power cutter head 3.
In the present embodiment, as shown in fig. 2 and 3, a first step portion 121 having an increased diameter is provided at an opening end of the mounting hole, and a second step portion 122 and a third step portion 123 having a decreased diameter are provided at an interval in the axial direction in the mounting hole;
one end of the outer ring of the first cemented carbide radial bearing 41 is provided with a first convex ring part 411 with an increased diameter, the end surface of the first convex ring part 411 abuts against the first step part 121, and the first convex ring part 411 is fixedly connected to the first step part 121; the inner ring of the first hard alloy radial bearing 41 is sleeved on the connecting shaft 33;
one end of the outer ring of the second cemented carbide radial bearing 42 is provided with a second protruding ring portion 421 with an increased diameter, the end surface of the second protruding ring portion 421 abuts against the third step portion 123, and the second protruding ring portion 421 is fixedly connected to the third step portion 123; the inner ring of the second hard alloy radial bearing 42 is sleeved on the connecting shaft 33;
the outer ring of the thrust bearing group 43 is sleeved in the mounting hole, and two ends of the outer ring of the thrust bearing group 43 axially abut against the outer ring of the first hard alloy radial bearing 41 and the second step portion 122, so that the outer ring of the thrust bearing group 43 is fixed, and the inner ring of the thrust bearing group 43 is sleeved on the connecting shaft 33; a first axial retainer ring 44 is sleeved on the connecting shaft 33 between the first cemented carbide radial bearing 41 and the thrust bearing set 43, and the first axial retainer ring 44 can axially stop the inner ring of the first cemented carbide radial bearing 41; a second axial retainer ring 45 is sleeved on the connecting shaft 33 between the thrust bearing group 43 and the second hard alloy radial bearing 42, and the second axial retainer ring 45 can axially stop the inner ring of the second hard alloy radial bearing 42; the outer wall of one end of the connecting shaft 33 far away from the jet power cutter head 3 is sleeved with a shaft end retaining ring 46. In this embodiment, the connecting shaft 33 is provided with a first locking groove, a second locking groove and a third locking groove, the first axial retaining ring 44 is locked in the first locking groove, the second axial retaining ring 45 is locked in the second locking groove, and the shaft end retaining ring 46 is locked in the third locking groove. The first axial retainer ring 44, the second axial retainer ring 45 and the thrust bearing group 43 form an axial limiting structure of the connecting shaft 33; the shaft end stop ring 46 prevents the inner ring of the second cemented carbide radial bearing 42 from falling off.
Further, set up rubber pad 5 between first bulge loop portion 411 and the first step portion 121 of first carbide radial bearing 41 outer lane, prevent that large granule silt from getting into first carbide radial bearing 41, a small amount of mud and drilling fluid can get into inside first carbide radial bearing 41 by first carbide radial bearing 41 outer lane and inner circle complex clearance simultaneously, realize lubricated effect.
When the hybrid PDC drill bit 100 based on the jet technology is used for drilling a complex stratum, a main shaft (in the prior art, the interior is hollow, and the drill bit is communicated with the bottom of the main shaft in a sealing mode) is set to rotate along the anticlockwise direction, the main shaft drives a drill bit body 1 to rotate anticlockwise, a drill bit blade 2 rotates anticlockwise along with the drill bit body 1, a jet power tool bit 3 revolves anticlockwise along with the drill bit body 1, and the drill bit blade 2 mechanically cuts a rock stratum to form a vortex-shaped groove mark along with the anticlockwise rotation of the drill bit body 1; when the main shaft is started to rotate, drilling fluid is injected into an inner cavity of the main shaft (in the prior art), the drilling fluid flows to a drilling fluid channel hole 10 from the inner cavity of the main shaft, and part of the drilling fluid flows out of the drill bit body 1 through a drilling fluid nozzle 11, so that the effects of cooling and cleaning are realized; the other part of the drilling fluid forms high-pressure jet flow towards the anticlockwise direction through the fluid through hole 331 on the connecting shaft 33, the jet flow channel hole 30 on the jet flow power tool bit 3 and the jet flow nozzle 32, under the action of the high-pressure jet flow, the jet flow power tool bit 3 generates circumferential high-speed power in the clockwise direction, the jet flow power tool bit 3 rotates clockwise while revolving anticlockwise along the tool bit body 1, the tool bit wing of the jet flow power tool bit 3 secondarily impacts and grinds the rock stratum along the direction perpendicular to the volute groove marks, meanwhile, the rotating high-pressure jet flow generates hydraulic impact crushing and efficient washing on the rock stratum, and mechanical and hydraulic crossed rock breaking in a complex stratum is achieved.
From the above, the hybrid PDC drill bit based on the jet technology has the following beneficial effects:
according to the hybrid PDC drill bit based on the jet technology, staggered cutting, grinding and jet impact are performed on rock strata with different characteristics, the drill bit blades rotate along the drill bit body in the same direction to mechanically cut the rock strata to form vortex-shaped groove marks, the jet power tool bit uses the reaction force of high-pressure jet as rotary power, the tool bit blades rotate in the reverse direction to secondarily impact and grind the rock strata along the direction perpendicular to the vortex-shaped groove marks, and meanwhile, the rotating high-pressure jet generates hydraulic impact crushing and efficient washing on the rock strata, so that mechanical and hydraulic crossed rock breaking in a complex stratum is realized, the adaptability of the drill bit to various strata is greatly improved, the rock breaking efficiency and the chip cleaning effect are improved, the drilling period is shortened, the service life of the drill bit is fundamentally prolonged, the drilling cost is reduced, and the exploration and development benefits are.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
Claims (10)
1. The utility model provides a hybrid PDC drill bit based on fluidic technique, includes the drill bit body, its characterized in that, the one end of drill bit body is radial symmetry and sets up two at least drill bit blades, the drill bit blade can follow the mechanical cutting rock stratum of drill bit body syntropy rotation, the one end of drill bit body still is radial symmetry and sets up two at least efflux power tool bits, efflux power tool bit with the quantity of drill bit blade is the same just efflux power tool bit with the drill bit blade is along the even crisscross setting in circumference, set up a plurality of tool bit blades along the even interval in circumference on the efflux power tool bit, each set up the jet nozzle that can produce high-pressure jet respectively along circumference one side of efflux power tool bit on the tool bit blade, efflux power tool bit can follow the drill bit body syntropy turnover and can be under the high-pressure jet promotes reverse rotation, each the tool bit blade can impact the ground rock stratum by secondary and the high-pressure jet energy that jet nozzle produced sprays broken rock And (3) a layer.
2. The hybrid PDC drill bit based on the jet technology of claim 1, wherein each of the cutter blades has a plurality of side tapered teeth along a radially outer sidewall of the jet power cutter, and wherein wedge teeth are disposed on end faces of each of the cutter blades on a same side of the jet power cutter in a circumferential direction, and end tapered teeth are disposed on the wedge teeth on a side of the jet power cutter in the circumferential direction.
3. The hybrid PDC drill bit based on jet technology of claim 2, wherein the wedge set includes a plurality of radially spaced wedge teeth, the number of end cone teeth on two radially symmetric blades is the same and the number of wedge teeth on two blades is the same.
4. The hybrid PDC drill bit based on the jet technology of claim 1, wherein a drilling fluid channel hole is axially disposed in the drill bit body, a jetting angle of each of the jet nozzles is adjustable, and each of the jet nozzles is communicable with the drilling fluid channel hole.
5. The hybrid PDC drill bit based on the jet technology of any one of claims 1 to 3, wherein the number of the drill blades is 2, the number of the jet power cutter heads is 2, a drilling fluid channel hole is axially formed in the drill bit body, 4 drilling fluid nozzles communicated with the drilling fluid channel hole are arranged at one end of the drill bit body, one drill blade and an adjacent jet power cutter head are set to form a cutting group, one drilling fluid nozzle is arranged at one end of the drill bit body between the drill blade and the jet power cutter head in each cutting group, one drilling fluid nozzle is arranged at one end of the drill bit body at a chip discharge groove of the drill blade in each cutting group, and the drilling fluid nozzles are uniformly arranged at intervals in the circumferential direction.
6. A hybrid PDC drill bit based on jet technology according to any one of claims 1 to 3 wherein a drilling fluid passage hole is axially provided in the drill bit body, a jet passage hole capable of communicating with the drilling fluid passage hole is axially provided in each of the jet power cartridges, and each of the jet nozzles is provided in communication with the jet passage hole.
7. The hybrid PDC drill bit based on the jet technology as in claim 6, wherein a plurality of radially and symmetrically arranged mounting holes are formed in one end of the drill bit body from the end portion inwards, a hollow rotary connecting structure is rotatably mounted in each mounting hole, one end of each rotary connecting structure is detachably connected with a jet power cutter head, and a jet channel hole of the jet power cutter head is communicated with the drilling fluid channel hole through an inner cavity of the rotary connecting structure.
8. The hybrid PDC drill bit based on the jet technology of claim 7, wherein the rotational connection structure includes a first cemented carbide radial bearing, a thrust bearing set and a second cemented carbide radial bearing sequentially sleeved in the mounting hole, a connection shaft is rotatably sleeved in the first cemented carbide radial bearing, the thrust bearing set and the second cemented carbide radial bearing, a fluid through hole capable of communicating with the jet passage hole and the drilling fluid passage hole is axially arranged in the connection shaft, and one end of the fluid through hole is in sealed communication with the jet power bit.
9. The hybrid PDC bit based on jet technology of claim 8 wherein the open end of the mounting bore is provided with a first step portion of increasing diameter, and wherein the mounting bore is axially spaced apart with second and third step portions of decreasing diameter;
one end of the outer ring of the first hard alloy radial bearing is provided with a first convex ring part with the diameter being increased, the end face of the first convex ring part abuts against the first step part and is fixedly connected to the first step part, and the inner ring of the first hard alloy radial bearing is sleeved on the connecting shaft; one end of the outer ring of the second hard alloy radial bearing is provided with a second convex ring part with the diameter being increased, the end face of the second convex ring part abuts against the third step part and is fixedly connected to the third step part, and the inner ring of the second hard alloy radial bearing is sleeved on the connecting shaft; the outer ring of the thrust bearing group is sleeved in the mounting hole, two ends of the outer ring of the thrust bearing group are axially abutted against the outer ring of the first hard alloy radial bearing and the second step part, and the inner ring of the thrust bearing group is sleeved on the connecting shaft; a first axial check ring is sleeved on the connecting shaft between the first hard alloy radial bearing and the thrust bearing group, and the first axial check ring can axially stop the inner ring of the first hard alloy radial bearing; a second axial check ring is sleeved on the connecting shaft between the thrust bearing group and the second hard alloy radial bearing and can axially stop the inner ring of the second hard alloy radial bearing; and a shaft end baffle ring is sleeved on the outer wall of one end of the connecting shaft, which is far away from the jet power tool bit.
10. The hybrid PDC drill bit based on the fluidic technology of claim 9 wherein the connecting shaft is provided with a first locking groove, a second locking groove and a third locking groove, the first axial retaining ring is locked in the first locking groove, the second axial retaining ring is locked in the second locking groove, and the shaft end retaining ring is locked in the third locking groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811056685.6A CN109025831B (en) | 2018-09-11 | 2018-09-11 | Hybrid PDC drill bit based on jet technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811056685.6A CN109025831B (en) | 2018-09-11 | 2018-09-11 | Hybrid PDC drill bit based on jet technology |
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| Publication Number | Publication Date |
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| CN109025831A CN109025831A (en) | 2018-12-18 |
| CN109025831B true CN109025831B (en) | 2020-03-13 |
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| CN201811056685.6A Expired - Fee Related CN109025831B (en) | 2018-09-11 | 2018-09-11 | Hybrid PDC drill bit based on jet technology |
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| CN114737887A (en) * | 2022-03-18 | 2022-07-12 | 西南石油大学 | Drill bit with swing nozzle |
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