CN110469271B - Tricone bit and preparation method thereof - Google Patents
Tricone bit and preparation method thereof Download PDFInfo
- Publication number
- CN110469271B CN110469271B CN201910788696.1A CN201910788696A CN110469271B CN 110469271 B CN110469271 B CN 110469271B CN 201910788696 A CN201910788696 A CN 201910788696A CN 110469271 B CN110469271 B CN 110469271B
- Authority
- CN
- China
- Prior art keywords
- oil storage
- oil
- connector
- cone
- annular
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 238000003860 storage Methods 0.000 claims abstract description 92
- 238000007789 sealing Methods 0.000 claims abstract description 45
- 230000001050 lubricating effect Effects 0.000 claims abstract description 30
- 239000004519 grease Substances 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 15
- 239000007924 injection Substances 0.000 claims abstract description 15
- 239000011435 rock Substances 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000011010 flushing procedure Methods 0.000 claims abstract description 5
- 230000001502 supplementing effect Effects 0.000 claims abstract description 3
- 230000036346 tooth eruption Effects 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- -1 polytetrafluoroethylene Polymers 0.000 claims description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000003973 paint Substances 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 5
- 229920000297 Rayon Polymers 0.000 claims description 4
- 229910003460 diamond Inorganic materials 0.000 claims description 4
- 239000010432 diamond Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005553 drilling Methods 0.000 description 13
- 239000012530 fluid Substances 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 7
- 238000005461 lubrication Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 4
- 210000003781 tooth socket Anatomy 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
-
- 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
- E21B10/08—Roller bits
- E21B10/16—Roller bits characterised by tooth form or arrangement
-
- 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
- E21B10/08—Roller bits
- E21B10/18—Roller 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
- E21B10/00—Drill bits
- E21B10/08—Roller bits
- E21B10/22—Roller bits characterised by bearing, lubrication or sealing details
-
- 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
- E21B10/08—Roller bits
- E21B10/22—Roller bits characterised by bearing, lubrication or sealing details
- E21B10/24—Roller bits characterised by bearing, lubrication or sealing details characterised by lubricating details
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- 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 discloses a tricone bit and a preparation method thereof, wherein the tricone bit comprises a connector and a bit leg welded with the connector into a whole, an oil storage hole is formed in the connector, and a thread on the outer surface of the connector covers the lower part of an opening of the oil storage hole; the bit leg is provided with three cones through a bearing, and included angles between adjacent cones are the same; the connecting head is provided with an oil storage compensation system for balancing the internal and external pressure of the bearing cavity and supplementing lubricating grease of the bearing cavity and an injection system for flushing the cone and assisting in rock breaking; the oil storage compensation system comprises an oil storage device arranged in the oil storage hole, a bearing sealing ring and a flow guide pipeline network which is arranged on the tooth palm and the connecting head and guides lubricating grease in the oil storage device into the bearing cavity; according to the tricone bit and the preparation method thereof, the injection system and the oil storage compensation system are arranged, so that the cost, the production efficiency, the working efficiency and the service life of the bit are well improved.
Description
Technical Field
The invention relates to a drill bit for petroleum drilling, in particular to a tricone bit and a preparation method thereof.
Background
When a cone in a drill bit rotates to crush rock, in order to deal with high pressure formed by drilling fluid at the well bottom, an oil storage compensation device is generally designed at the back of a bit leg, and the oil storage compensation device has the task of ensuring that a sealing ring and a bearing have good working conditions, so that the service life of the sealing ring and the bearing is prolonged. The oil storage compensation device, the bearing sealing ring and the oil duct form an oil storage sealing compensation system, so that the bearing is ensured to work under a good lubricating condition and a sealing state, and the service life of the drill bearing is prolonged.
The existing drill bit is generally provided with a plurality of cones to improve the drilling efficiency, in order to ensure the service life of a bearing and a sealing ring at each cone, an oil storage sealing compensation system is required to be arranged on each bit leg, and after a plurality of oil storage sealing compensation systems are arranged, each compensation system is required to be respectively subjected to lubricating grease inspection and lubricating grease compensation in the subsequent use process, so that the lubricating grease inspection and lubricating grease compensation processes are complicated.
Disclosure of Invention
Aiming at the defects in the prior art, the tricone bit and the preparation method thereof provided by the invention solve the problem of complex lubricating grease checking and lubricating grease compensating procedures.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the tricone bit comprises a connector and a bit leg welded with the connector into a whole, wherein an oil storage hole is formed in the connector, and threads on the outer surface of the connector cover the lower part of an opening of the oil storage hole; the bit leg is provided with three cones through a bearing, and included angles between adjacent cones are the same;
the connecting head is provided with an oil storage compensation system for balancing the internal and external pressure of the bearing cavity and supplementing lubricating grease of the bearing cavity and an injection system for cooling and flushing the cone and assisting in rock breaking; the oil storage compensation system comprises an oil storage device arranged in the oil storage hole, a bearing sealing ring and a flow guide pipeline network which is arranged on the bit leg and the connecting head and guides lubricating grease in the oil storage device into the bearing cavity; the oil storage device comprises a mounting box, a lower cylinder body and an upper cylinder body, the lower cylinder body is fixedly mounted at the bottom of the mounting box, and a pressure transmission gap is formed between the bottom of the lower cylinder body and the bottom of the mounting box through a step at the bottom of the mounting box; the pressure transmission gap is communicated with the injection system through a pipeline arranged in a through groove of the connector, and a polytetrafluoroethylene film is arranged on the section, adjacent to the injection system, of the pipeline; a pressure relief oil storage bag with a needle hole in the side wall of the top end is arranged in the lower cylinder body, the upper cylinder body fixes the pressure relief oil storage bag in the lower cylinder body, and the upper cylinder body and the pressure relief oil storage bag form a closed oil storage cavity;
the guide pipeline network comprises a first oil guide pipe which is arranged on the connecting head and communicated with the upper cylinder body, an annular guide groove which is arranged on the welding end face of the connecting head and communicated with the first oil guide pipe, and a second oil guide pipe which is arranged on the bit leg of each cone mounting side, communicated with the annular guide groove and used for guiding lubricating grease into the bearing.
A second aspect provides a method of making a tricone bit, comprising the steps of:
casting to form a connector blank with a main flow passage inside, a bit leg blank with the main flow passage and an auxiliary flow passage on the connector blank, and a cone blank with an inner hole on the cone leg blank and a plurality of tooth grooves on the outer surface;
processing an oil storage hole on the outer surface of the connector in the height direction, and processing a through groove communicated with the main runner at the bottom of the oil storage hole;
processing the thread on the outer surface of the connector, processing the thread below the oil storage hole, then processing an annular step groove on the end face with larger size of the connector, and processing a first oil guide pipe communicated with the oil storage hole in the annular step groove;
processing a horizontal oil guide pipe parallel to the horizontal plane on the back of the palm of the tooth, and processing an inclined oil guide pipe communicated with each horizontal oil guide pipe from the end face of the tooth palm;
uniformly coating a paint with a certain thickness on a non-carburized part before heat treatment of the cone, avoiding the paint from falling off in the carburization process, and then carrying out heat treatment and finish machining on the cone, the connector and the bit leg;
placing the pipeline in the through groove, then placing the mounting box part in the oil storage hole, adjusting the mounting box to align the oil outlet hole of the oil storage device with the first oil guide pipe, and then clamping the mounting box;
coating viscose on the annular sealing washer, placing the annular sealing washer on the annular step groove, adjusting the annular sealing washer to enable the second oil guide pipe to be communicated with the interior of the annular flow guide groove through an oil passing hole formed in the annular sealing washer, and then welding the connector and the bit leg into a whole;
pressing the cutting teeth into tooth grooves of the cone, and enabling the cutting teeth to be in interference fit with the tooth grooves; and a sealing ring is arranged at the sealing part of the bearing, and then the cone is locked on the bit leg through a steel ball.
The invention has the beneficial effects that: according to the scheme, the oil storage compensation system is arranged on the connecting head of the drill bit, lubricating grease is guided into the second oil guide pipe in each bit leg through the annular guide groove arranged on the welding end face of the connecting head, and by means of the structure, lubrication of all bearing cavities can be achieved by one oil storage compensation system no matter a plurality of gear cones are arranged, the number of the oil storage compensation systems is reduced, and therefore the complexity of lubricating grease inspection and lubricating grease compensation processes is reduced;
in addition, the reduction of the number of the oil storage compensation systems can simplify the manufacturing process of the whole drill lubricating system, thereby improving the machining efficiency of the whole drill and reducing the machining cost.
The thread of connector surface covers to the unique setting of oil storage hole opening below, can seal oil storage device's opening when connector and drilling string are connected to the detritus that comes down of cutting when avoiding the high-speed rotation of drill bit damages the upper cylinder body, makes oil storage device appear that lubricating grease reveals and influences the lubrication of bearing and the inside and outside pressure balance of sealing washer.
According to the scheme, the pressure relief needle hole, the pressure transmission gap and the pipeline on the oil storage device are matched with each other, so that the inner cavity of the lower cylinder body can be communicated with the drilling fluid flow channel in the connector, and the air pressure in the pressure relief oil storage bag is always in a balanced state with the air pressure in the drilling fluid flow channel; the polytetrafluoroethylene film is arranged, so that gas for balancing air pressure can pass through the polytetrafluoroethylene film conveniently, and meanwhile, drilling fluid can be prevented from entering the lower cylinder body to influence air pressure balance.
After the cutting teeth adopt the diamond composite teeth, the drill bit not only has the high hardness, the high wear resistance and the heat conductivity of diamond, but also has the strength and the impact toughness of hard alloy.
Drawings
FIG. 1 is a partial cross-sectional view of a tricone bit.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is a cross-sectional view of the showerhead.
Wherein, 1, a connector; 11. an injection system; 111. a side runner; 112. a secondary flow passage; 113. a main flow channel; 12. an annular step groove; 13. an annular sealing gasket 13; 2. a bit leg; 21. a bit leg mounting portion; 211. a second oil guide pipe; 212. an arc-shaped connecting surface; 22. a seal ring; 23. a bearing; 3. a cone; 31. cutting teeth; 4. an oil storage device; 41. mounting a box; 411. an upper cylinder body; 412. a lower cylinder body; 4121. a pressure transmission gap; 413. a pressure relief oil storage bag; 414. a step; 42. a pipeline; 421. a polytetrafluoroethylene film; 43. the first oil guide pipe.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, the tricone bit comprises a connector 1 and a bit leg 2 welded with the connector 1 into a whole, an oil storage hole is formed on the connector 1, and a thread on the outer surface of the connector 1 covers the lower part of an opening of the oil storage hole; three cones 3 are arranged on the bit leg 2 through a bearing 23, and the included angles between the adjacent cones 3 are the same.
An oil storage compensation system for lubricating a bearing 23 and an injection system 11 for cooling and washing the cone 3 are arranged on the connector 1; the oil storage compensation system comprises an oil storage device 4 arranged in an oil storage hole and a flow guide pipeline network which is arranged on the tooth leg 2 and the connector 1 and guides lubricating grease in the oil storage device 4 into the bearing 23.
This scheme is because the length of the screw thread that connector 1 and outside drilling string are connected covers to the oil storage hole open-ended below, installs oil storage device 4 like this at the downthehole back of oil storage, can seal oil storage device 4's opening to the detritus that comes down in the cutting when avoiding the high-speed rotation of drill bit damages cylinder body 411, makes oil storage device 4 appear that lubricating grease reveals and influences the lubrication of bearing 23 and the inside and outside pressure balance of sealing washer 22.
As shown in fig. 2, the oil storage device 4 includes a mounting box 41, a lower cylinder 412 and an upper cylinder 411, the lower cylinder 412 is fixedly mounted at the bottom of the mounting box 41, and a pressure transmission gap 4121 is formed between the bottom of the lower cylinder 412 and the bottom of the mounting box 41 by a step 414 at the bottom of the mounting box 41; the pressure transfer gap 4121 is communicated with the injection system 11 through a pipeline 42 arranged in a through groove of the connecting head 1, and a polytetrafluoroethylene film 421 is arranged on the pipeline 42 adjacent to the section of the injection system 11.
The polytetrafluoroethylene film 421 is arranged to facilitate the passage of gas for balancing the pressure, and to prevent the drilling fluid from entering the lower cylinder 412 to affect the pressure balance.
A pressure relief oil storage bag 413 with a needle hole in the top side wall is placed in the lower cylinder 412, the upper cylinder 411 fixes the pressure relief oil storage bag 413 in the lower cylinder 412, and the upper cylinder 411 and the pressure relief oil storage bag 413 form a sealed oil storage cavity.
The pressure relief oil storage bag 413 is made of rubber materials, so that in the high-speed rotation process, the pressure relief oil storage bag 413 is periodically contracted and extended under the action force of a stratum on a drill bit, and lubricating grease is discharged to a flow guide pipeline network from an oil storage cavity during contraction, so that lubrication of the bearing 23 and balance of the internal pressure and the external pressure of the sealing ring 22 are realized.
In a plurality of widgets of the oil storage device 4 of this scheme all concentrated and are fixed in mounting box 41, can be outside the good back of assembling oil storage device 4 like this, direct whole is installed in the oil storage downthehole for the equipment is very convenient, when lubricating grease changes or mounting box 41 maintains in addition, also can wholly take out, makes change lubricating grease and maintenance also convenience very.
In addition, the oil storage compensation system is arranged on the connector 1 of the drill bit, lubricating grease is guided into the second oil guide pipe 211 in each bit leg 2 through the annular guide groove arranged on the welding end face of the connector 1, and lubrication of all bearings 23 and internal and external pressure balance of the sealing ring 22 can be realized by one oil storage compensation system through arrangement of the structure regardless of arrangement of the cones 3, so that the number of the oil storage compensation systems is reduced, and complexity of lubricating grease inspection and lubricating grease compensation processes is reduced.
The flow guide pipeline network comprises a first oil guide pipe 43 which is arranged on the connector 1 and communicated with the upper cylinder 411, an annular flow guide groove which is arranged on the welding end face of the connector 1 and communicated with the first oil guide pipe 43, and a second oil guide pipe 211 which is arranged on each tooth leg 2, communicated with the annular flow guide groove and used for guiding lubricating grease into the bearing 23.
Referring to fig. 2 again, the annular diversion trench includes an annular step trench 12 opened on the welding end face of the connector 1 and an annular sealing gasket 13 placed on the adjacent end face of the annular step trench 12 for sealing the annular step trench 12 to form an annular oil conduit; the second oil conduit 211 is communicated with the inside of the annular diversion trench through an oil passing hole formed on the annular sealing washer 13.
When the connector 1 and the bit leg 2 are welded, firstly, the annular sealing washer 13 is coated with adhesive, then the annular sealing washer 13 is placed in the annular step groove 12, and the annular sealing washer 13 is rotated to enable the oil passing hole on the annular sealing washer to be aligned with the inlet of the third oil guide pipe; and after the viscose is dried completely, welding the connector 1 and the tooth leg 2 to form a whole.
When the oil guide device is implemented, the second oil guide pipe 211 preferably comprises an inclined oil guide pipe and a horizontal oil guide pipe parallel to the horizontal plane, the inclined oil guide pipe is communicated with the horizontal oil guide pipe, the back end of the horizontal oil guide pipe, which is adjacent to the palm end of the tooth palm 2, is sealed by a sealing gasket, and the other end of the horizontal oil guide pipe extends to the ball groove of the bearing 23.
In one embodiment of the present invention, the injection system 11 comprises a main flow channel 113 penetrating the connecting head 1 and the bit leg 2, the main flow channel 113 being connected with three sub flow channels 112 and three side flow channels 111 adjacent to the water outlet thereof; the included angle formed between the secondary flow channels 112 and the primary flow channel 113 is less than 30 degrees, and the extension line of each secondary flow channel 112 is positioned between the first circle of cutting teeth 31 and the second circle of cutting teeth 31 at the root of the cone 3 adjacent to the secondary flow channel; the water outlet of each side flow passage 111 is positioned in the arc-shaped connecting surface 212 formed between two adjacent bit leg mounting parts 21.
As shown in fig. 3, in the present embodiment, preferably, nozzles are mounted on the water outlets of the main flow channel 113 and the secondary flow channel 112, and the annular water outlets on the nozzles are inclined toward the annular edge of the nozzles; after the annular water outlet hole of the nozzle is arranged by adopting the structure, water flow can be sprayed more uniformly, and meanwhile, more water sprayed from the main flow passage 113 can be sprayed towards the direction of the roller cone 3.
The cone 3 is further provided with a plurality of criss-cross flushing grooves (not shown in the figure) with the depth of 0.1-0.2 cm, and water sprayed from the spray head can uniformly flow on the surface of the cone 3 due to the arrangement of the flushing grooves, so that rock debris can be further prevented from being adhered to the surface of the cone 3.
As shown in fig. 1, all the cutting teeth 31 of the cone 3 are diamond composite teeth, and the cutting teeth 31 of the cone 3 are pressed into tooth grooves formed on the arc-shaped surface of the cone 3 and are in interference fit with the tooth grooves; the cutting teeth 31 are positioned inside the tooth socket and divided into cylinders, the cutting teeth are positioned outside the clamping grooves and divided into conical bosses with sharp tops removed, and the length of the inner parts of the cutting teeth 31 positioned in the tooth socket is larger than that of the outer parts of the cutting teeth 31 positioned in the tooth socket.
The length of the cutting teeth 31 positioned in the tooth groove inner part is larger than that of the cutting teeth 31 positioned in the tooth groove outer part, so that the stability of the cutting teeth 31 positioned in the tooth groove can be improved, and the cutting teeth 31 are prevented from falling off under the action of centrifugal force during high-speed rotation; in addition, due to the fact that the length of the cutting tool is set, when the cutting tool is used for cutting at a high speed, the phenomenon that the cutting tool is broken when a rock body is cut can be avoided due to the fact that the part, located outside the tooth groove, of the cutting tool is short; the arrangement of the cutting teeth 31 outside the tooth grooves can increase the contact area with the rock body, so that the integral wear resistance is greatly improved.
Now that the description of the structure of the tricone 3 bit has been completed, a description of a method of manufacturing the tricone 3 bit will be described.
The scheme also provides a preparation method of the tricone bit, which comprises the following steps:
casting to form a blank of the connecting head 1 with a main flow passage 113 inside, a blank of the bit leg 2 with the main flow passage 113 and an auxiliary flow passage 112 on the blank, and a blank of the cone 3 with an inner hole on the blank and a plurality of tooth grooves on the outer surface;
processing an oil storage hole on the outer surface of the connector 1 in the height direction, and processing a through groove communicated with the main runner 113 at the bottom of the oil storage hole;
processing the thread on the outer surface of the connector 1, processing the thread below the oil storage hole, then processing an annular step groove 12 on the end surface with larger size of the connector 1, and processing a first oil guide pipe 43 communicated with the oil storage hole in the annular step groove 12;
processing a horizontal oil guide pipe parallel to the horizontal plane on the back of the tooth leg 2, and processing an inclined oil guide pipe communicated with each horizontal oil guide pipe from the end face of the tooth leg 2;
uniformly coating a paint with a certain thickness on a non-carburized part before the heat treatment of the cone 3, avoiding the paint from falling off in the carburization process, and then carrying out heat treatment and finish machining on the cone 3, the connector 1 and the bit leg 2;
placing the pipeline 42 in the through groove, then placing part of the mounting box 41 in the oil storage hole, adjusting the mounting box 41 to align the oil outlet hole of the oil storage device 4 with the first oil guide pipe 43, and then clamping the mounting box 41;
coating viscose on an annular sealing washer 13, then placing the annular sealing washer 13 on an annular step groove 12, adjusting the annular sealing washer 13 to enable a second oil guide pipe 211 to be communicated with the interior of an annular flow guide groove through an oil passing hole formed in the annular sealing washer 13, and then welding a connector 1 and a tooth leg 2 into a whole;
pressing the cutting teeth 31 into the tooth grooves of the cone 3 and tightly fitting the cutting teeth 31 with the tooth grooves; a sealing ring 22 is placed at the bearing sealing position, and then the cone 3 is locked on the bit leg 2 through a steel ball.
In conclusion, the tricone bit and the preparation method thereof provided by the scheme have the advantages that the cost, the production efficiency, the working efficiency and the service life of the bit are well improved through the arrangement of the injection system 11 and the oil storage compensation system.
Claims (7)
1. The tricone bit is characterized by comprising a connector and a bit leg welded with the connector into a whole, wherein an oil storage hole is formed in the connector, and the thread on the outer surface of the connector covers the lower part of an opening of the oil storage hole; the cone leg is provided with three cones through a bearing, and included angles between adjacent cones are the same;
the connecting head is provided with an oil storage compensation system for balancing the internal and external pressure of the bearing cavity and supplementing lubricating grease of the bearing cavity and an injection system for cooling and flushing the cone and assisting in rock breaking; the oil storage compensation system comprises an oil storage device arranged in the oil storage hole, a bearing sealing ring and a flow guide pipeline network which is arranged on the bit leg and the connecting head and guides lubricating grease in the oil storage device into the bearing cavity;
the oil storage device comprises a mounting box, a lower cylinder body and an upper cylinder body, wherein the lower cylinder body is fixedly mounted at the bottom of the mounting box, and a pressure transmission gap is formed between the bottom of the lower cylinder body and the bottom of the mounting box through a step at the bottom of the mounting box; the pressure transmission gap is communicated with the injection system through a pipeline arranged in a through groove of the connector, and a polytetrafluoroethylene film is arranged on the pipeline adjacent to the injection system; the upper cylinder body and the pressure-relief oil storage bag form a closed oil storage cavity;
the flow guide pipeline network comprises a first oil guide pipe which is arranged on the connecting head and communicated with the upper cylinder body, an annular flow guide groove which is arranged on the welding end face of the connecting head and communicated with the first oil guide pipe, and a second oil guide pipe which is arranged on each tooth palm, communicated with the annular flow guide groove and used for guiding lubricating grease into the bearing.
2. The tricone bit of claim 1, wherein the annular guide groove comprises an annular step groove opened on a welding end face of the connector and an annular sealing gasket placed on an adjacent end face of the annular step groove and used for sealing the annular step groove to form an annular oil guide pipe; and the second oil guide pipe is communicated with the inside of the annular flow guide groove through an oil passing hole formed in the annular sealing gasket.
3. The tricone bit of claim 2, wherein the second oil conduit comprises an inclined oil conduit and a horizontal oil conduit parallel to a horizontal plane, the inclined oil conduit is communicated with the horizontal oil conduit, and the horizontal oil conduit extends to a ball groove of the bearing.
4. The tricone bit of claim 1, wherein the injection system comprises a main flow passage extending through the connection head and the bit leg, the main flow passage having three secondary flow passages and three side flow passages connected thereto adjacent to an outlet thereof; an included angle formed between the auxiliary flow channels and the main flow channel is smaller than 30 degrees, and an extension line of each auxiliary flow channel is positioned between the first circle of cutting teeth and the second circle of cutting teeth at the root part of the cone adjacent to the extension line; the water outlet of each side flow channel is positioned in an arc-shaped connecting surface formed between two adjacent cone mounting parts.
5. The tricone bit of claim 4, wherein the nozzles are installed on the water outlets of the main flow passage and the sub flow passage, and the annular water outlet holes on the nozzles are inclined towards the annular edge of the nozzles.
6. The tricone drill bit of any one of claims 1 to 5, wherein all cutting teeth of the cone are diamond composite teeth, and the cutting teeth of the cone are pressed into tooth grooves formed on an arc surface of the cone and are in interference fit with the tooth grooves; the cutting teeth are positioned inside the tooth grooves and are divided into cylinders, the cutting teeth are positioned outside the tooth grooves and are divided into conical bosses for removing sharp tops, and the length of the inner parts of the cutting teeth positioned in the tooth grooves is larger than that of the outer parts of the cutting teeth positioned in the clamping grooves.
7. A method of making a tricone bit as claimed in any one of claims 1 to 6, comprising the steps of:
casting to form a connector blank with a main flow passage inside, a bit leg blank with the main flow passage and an auxiliary flow passage on the connector blank, and a cone blank with an inner hole on the cone leg blank and a plurality of tooth grooves on the outer surface;
processing an oil storage hole on the outer surface of the connector in the height direction, and processing a through groove communicated with the main runner at the bottom of the oil storage hole;
processing the thread on the outer surface of the connector, processing the thread below the oil storage hole, then processing an annular step groove on the end face with larger size of the connector, and processing a first oil guide pipe communicated with the oil storage hole in the annular step groove;
processing a horizontal oil guide pipe parallel to the horizontal plane on the back of each palm, and processing an inclined oil guide pipe communicated with each horizontal oil guide pipe from the end face of each palm;
uniformly coating a paint with a certain thickness on a non-carburized part before heat treatment of the cone, avoiding the paint from falling off in the carburization process, and then carrying out heat treatment and finish machining on the cone, the connector and the bit leg;
placing the pipeline in the through groove, then placing the mounting box part in the oil storage hole, adjusting the mounting box to align the oil outlet hole of the oil storage device with the first oil guide pipe, and then clamping the mounting box;
coating viscose on the annular sealing washer, placing the annular sealing washer on the annular step groove, adjusting the annular sealing washer to enable the second oil guide pipe to be communicated with the interior of the annular flow guide groove through an oil passing hole formed in the annular sealing washer, and then welding the connector and the bit leg into a whole;
pressing the cutting teeth into tooth grooves of the cone, and enabling the cutting teeth to be in interference fit with the tooth grooves; and a sealing ring is arranged at the sealing part of the bearing, and then the cone is locked on the bit leg through a steel ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910788696.1A CN110469271B (en) | 2019-08-26 | 2019-08-26 | Tricone bit and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910788696.1A CN110469271B (en) | 2019-08-26 | 2019-08-26 | Tricone bit and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110469271A CN110469271A (en) | 2019-11-19 |
| CN110469271B true CN110469271B (en) | 2020-04-28 |
Family
ID=68512174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910788696.1A Active CN110469271B (en) | 2019-08-26 | 2019-08-26 | Tricone bit and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110469271B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111456634B (en) * | 2020-04-09 | 2022-01-25 | 沧州格锐特钻头有限公司 | Drill bit for oil drilling |
| CN114320162A (en) * | 2022-01-21 | 2022-04-12 | 徐文飞 | Roller bit with automatic oil injection function for petroleum drilling |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2690554Y (en) * | 2004-03-20 | 2005-04-06 | 江西宜春飞龙钻头制造有限公司 | Rock bit grease pressure compensator |
| CN100567697C (en) * | 2006-07-17 | 2009-12-09 | 苏州江钻新锐工程工具有限公司 | Blasthole tricone rock bit |
| US20080245577A1 (en) * | 2007-04-05 | 2008-10-09 | Baker Hughes Incorporated | System, method, and apparatus for contoured thrust surfaces between thrust washer and head for roller cone drill bit |
| CN208347692U (en) * | 2017-12-22 | 2019-01-08 | 天津立林钻头有限公司 | Rock bit pressure oil storage compensating device and its rock bit |
-
2019
- 2019-08-26 CN CN201910788696.1A patent/CN110469271B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110469271A (en) | 2019-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110469271B (en) | Tricone bit and preparation method thereof | |
| CN110485930B (en) | PDC-roller composite bit | |
| US5072796A (en) | Boring bit | |
| WO2022116501A1 (en) | Self-cooling hob capable of preventing chips from remaining | |
| US8573706B2 (en) | Cutting tool with nozzle for spraying water on a cutter bit | |
| CN106322024A (en) | Feeding sealing device for wet ball mill, sealing system and mounting method of sealing system | |
| CN111287660A (en) | Impact rotary jet drilling tool | |
| CN210564520U (en) | Inner spray sealing device of cantilever type tunneling machine | |
| CN203891809U (en) | Gas faucet for drilling rig and deep-well drilling rig | |
| CN111167626A (en) | High-pressure water rotary nozzle with drainage structure design | |
| CN208934625U (en) | A kind of hydraulic oscillation cleaning means | |
| CN203185305U (en) | Water cooling mechanism of engineering driller | |
| CN210918920U (en) | Self-rotating dynamic stabilization short joint | |
| CN210068084U (en) | Cleaning device for underwater wellhead area | |
| CN105672883B (en) | A kind of drilling well speed-raising tool and its accelerating method | |
| CN208650816U (en) | A kind of geomantic omen faucet | |
| CN107939299B (en) | Drilling tool protection frame with grouting function | |
| CN213379306U (en) | Central water outlet main shaft | |
| CN112247207A (en) | Deep hole drilling machine oil supply device assembly | |
| CN212055350U (en) | Novel hydraulic central swivel joint | |
| CN221096468U (en) | Deepwater wellhead cutting tool | |
| CN221001368U (en) | Sewage pipe dredging device capable of being opened quickly | |
| CN117248825B (en) | Dual shunt of top drive drilling machine | |
| CN112013100B (en) | Micro-positive pressure sealing structure at upper end of top drive spindle and micro-positive pressure establishing method | |
| CN215057138U (en) | Hob capable of maintaining cantilever |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201116 Address after: 610051 No.3, Chengji Road, Longtan Industrial Park, Chenghua District, Chengdu City, Sichuan Province Patentee after: Sichuan Gemstone Machinery Petroleum Bit Co.,Ltd. Patentee after: CHINA NATIONAL PETROLEUM Corp. Address before: 610051 No.3, Chengji Road, Longtan Industrial Park, Chenghua District, Chengdu City, Sichuan Province Patentee before: Sichuan Gemstone Machinery Petroleum Bit Co.,Ltd. |
|
| TR01 | Transfer of patent right |