CN109958396B - Air bores roller bit device - Google Patents
Air bores roller bit device Download PDFInfo
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- CN109958396B CN109958396B CN201711407412.7A CN201711407412A CN109958396B CN 109958396 B CN109958396 B CN 109958396B CN 201711407412 A CN201711407412 A CN 201711407412A CN 109958396 B CN109958396 B CN 109958396B
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- cooling
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- 238000005553 drilling Methods 0.000 claims abstract description 84
- 238000001816 cooling Methods 0.000 claims abstract description 81
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 239000011435 rock Substances 0.000 claims description 50
- 238000004891 communication Methods 0.000 claims description 22
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 238000012937 correction Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 8
- 238000011161 development Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- E21B10/02—Core bits
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/16—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/02—Fluid rotary type drives
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- 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 provides an air drilling roller bit device, comprising: the cooling device comprises an inner barrel for receiving air and an outer barrel arranged outside the inner barrel, wherein a cooling cavity is formed between the inner barrel and the outer barrel; the vortex tubes are arranged in the cooling cavity and are used for converting air from the inner barrel into high-temperature air flow and low-temperature air flow; and the roller bit is arranged at one end of the outer barrel and is provided with a bearing cooling mechanism, wherein the low-temperature airflow generated by the vortex tube is guided to the bearing cooling mechanism.
Description
Technical Field
The invention relates to the field of geothermal resource development and petroleum drilling, in particular to an air drilling roller bit device, and particularly relates to an air drilling roller bit device for developing hot dry rock.
Background
With the problems of increasingly exhausted mineral resources, serious environmental pollution and the like, people begin to actively develop new energy. Wherein, the geothermal energy of the dry hot rock has the characteristics of green, low carbon, no pollution, huge reserves and the like. Therefore, the hot dry rock resource gradually becomes a hot spot for new energy development.
The occurrence conditions of the hot dry rock resources have two characteristics, one is that the formation temperature is high and reaches 200-300 ℃; the other is that the stratum is hard, the general lithology is granite and igneous rock, the uniaxial compressive strength is generally above 200MPa, the drillability is close to 10 grades, and the characteristic of hard brittleness of the rock is obvious. Under such conditions, air drilling is generally employed to increase the drilling speed, and air-drilling roller bit devices are often used.
However, there are still some problems in the development of hot dry rock resources at present. Because the temperature resistance of the rubber sealing bearing and the hydraulic oil of the air-drilling roller bit device is very limited and cannot meet the construction environment with the temperature of more than 200 ℃, the service life of the roller bit device for the air-drilling roller bit is extremely short, so that the roller bit device for the air-drilling roller bit needs to be repeatedly tripped out of the drill and replaced, the well formation speed of hot dry rock development is severely limited, and the efficiency and the cost of the hot dry rock development are influenced.
Disclosure of Invention
In view of at least some of the above-described technical problems, the present invention is directed to an air-drilling roller bit apparatus. The device cools the bearing of the cone pulley through low-temperature airflow, prolongs the service life of the bearing of the cone pulley, and sprays high-temperature rocks at the bottom of a well through the low-temperature airflow, so that the rock breaking effect is enhanced, and the rock breaking efficiency is improved. Meanwhile, the device further improves the rock breaking efficiency by reversely jetting high-pressure gas.
To this end, according to the present invention, there is provided an air-drilling roller bit device comprising: the cooling device comprises an inner barrel for receiving air and an outer barrel arranged outside the inner barrel, wherein a cooling cavity is formed between the inner barrel and the outer barrel; the vortex tubes are arranged in the cooling cavity and are used for converting air from the inner barrel into high-temperature air flow and low-temperature air flow; and the roller bit is arranged at one end of the outer barrel and is provided with a bearing cooling mechanism, wherein the low-temperature airflow generated by the vortex tube is guided to the bearing cooling mechanism.
In a preferred embodiment, a tubular communication member is provided within the cooling cavity, the communication member being connected with the inner barrel and the vortex tube to provide air from the inner barrel to the vortex tube.
In a preferred embodiment, a plurality of holes are provided in the side wall of the tubular communication member, each hole being connected to a respective vortex tube.
In a preferred embodiment, the bearing cooling mechanism includes a bearing cooling nozzle in communication with the low temperature gas stream outlet of the corresponding vortex tube.
In a preferred embodiment, the air-drilling roller cone drill bit device further comprises a bottom hole cooling nozzle, and the bottom hole cooling nozzle is arranged between adjacent roller cone drill bits.
In a preferred embodiment, the bottom hole cooling nozzle is communicated with the low-temperature airflow outlet of the corresponding vortex tube.
In a preferred embodiment, a reverse injection pressurizing nozzle is arranged at one end of the outer barrel, which is far away from the roller bit, and is communicated with a high-temperature airflow outlet of a corresponding vortex tube,
in a preferred embodiment, a flow regulating valve is arranged in each vortex tube and used for regulating the speed of the high-temperature air flow sprayed by the corresponding reverse-spraying pressurizing nozzle so as to correct the inclination of the air-drilling roller bit device.
In a preferred embodiment, the reverse jet booster nozzles are asymmetrically arranged in the circumferential direction for deskewing the air-drilling roller bit device.
In a preferred embodiment, a connecting part for connecting other drilling tools is arranged at one end of the inner cylinder far away from the roller bit.
According to the air drilling roller bit device, low-temperature air flow can be continuously sprayed through the bearing cooling mechanism to cool the roller bearing in the drilling process, so that the service life of the roller bearing under the high-temperature condition is prolonged. Meanwhile, the shaft bottom cooling nozzle continuously sprays low-temperature airflow to shaft bottom high-temperature rocks to change the temperature-variable stress of the rocks, so that the rock breaking effect is greatly enhanced, and the rock breaking efficiency is improved. In addition, the device increases the bit pressure acting on the bit through reversely jetting high-pressure gas, increases the soil-eating depth of the roller bit, and further improves the rock breaking efficiency of the air drilling roller bit device.
Drawings
The invention will now be described with reference to the accompanying drawings.
Fig. 1 shows the structure of an air-drilling roller bit device for developing hot dry rock according to the present invention.
Figure 2 shows the configuration of a vortex tube in the air-drilling roller bit assembly of figure 1.
In the present application, the drawings are all schematic and are used only for illustrating the principles of the invention and are not drawn to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
Fig. 1 shows the structure of an air-drilling roller bit apparatus 100 for developing hot dry rock according to the present invention. As shown in fig. 1, the air-drilling roller bit apparatus 100 has a generally cylindrical structure as a whole. The air-drilling roller bit device 100 includes an inner cylinder 120, and the inner cylinder 120 is for receiving high-pressure air. The inner cylinder 120 is constructed in a cylindrical structure, and a connection portion 121, which is preferably a connection screw, is provided at an upstream end of the inner cylinder 120. Thus, the air-drilling roller bit device 100 is connected to other downhole tools through connecting threads. The threaded connection structure of the inner cylinder 120 enables the air-drilling roller bit device 100 to be conveniently and quickly installed and connected.
In the present application, when the air-drilling roller cone drill bit apparatus 100 is lowered into a wellbore, an end of the air-drilling roller cone drill bit apparatus 100 that is located near the wellhead is defined as an upstream end or similar terms, and an end that is located away from the wellhead is defined as a downstream end or similar terms.
As shown in fig. 1, an outer tub 130 is provided outside the inner tub 120, so that a cooling chamber 110 is formed between the inner tub 120 and the outer tub 130. In one embodiment, the length of the outer tub 130 is set to be smaller than the length of the inner tub 120, thereby forming a step shape at the upstream end of the cooling chamber 110. Thus, connection of the air-drilling roller bit device 100 to other downhole tools is facilitated.
In the present embodiment, the inner tube 120 is spaced apart from the outer tube 130 at an upper portion of the cooling chamber 110, and a communication member 125 is provided at a lower portion. The communication member 125 is constructed in a tubular structure, and the upper portion of the communication member 125 is connected to the cooling inner pipe 120 and the lower portion is provided as a sealing structure. A hole 126 is provided on the side wall of the communication member 125 of a cylindrical tubular shape. In a preferred embodiment, the holes 126 are configured in a circular shape, and 6 circular holes 126 are provided on the sidewall of the tubular communication member 125, evenly distributed in the circumferential direction. It will of course be appreciated that the apertures 126 may be configured in other shapes, such as square, diamond, oval, etc. The function of the communication member 125 will be explained below.
According to the present invention, a vortex tube 140 is disposed between the inner cylinder 120 and the outer cylinder 130, and the vortex tube 140 is used for dividing high-pressure air and performing cooling and heating, thereby forming a high-temperature air flow and a low-temperature air flow. In a preferred embodiment, the length of the vortex tube 140 is set to 1-1.5 meters, and 6 vortex tubes 140 are uniformly distributed in the circumferential direction between the inner drum 120 and the outer drum 130. The size and the arrangement structure of the vortex tube 140 can enable the cooling cavity 110 to have good cooling effect, and simultaneously avoid resource waste caused by overlong vortex tube 140.
FIG. 2 shows the internal structure of the vortex tube 140. As shown in fig. 2, the vortex tube 140 includes a vortex tube body 141, and the vortex tube body 141 has a substantially cylindrical structure. The vortex tube 140 includes a high-temperature gas flow outlet 142 provided at one end (upper end in fig. 2) of the vortex tube body 141, and a low-temperature gas flow outlet 143 provided at the opposite end of the vortex tube body 141, and a high-pressure air inlet 144 is provided on a sidewall of the vortex tube body 141.
In the present embodiment, the communication member 125 is connected with the inner cartridge 120 and the vortex tube 140 to provide air from the inner cartridge 120 to the vortex tube 140. The holes 126 in the communication member 125 are connected to the high pressure air inlet 144 of the corresponding vortex tube 140. The size of the bore 126 of the communication member 125 is determined primarily by air pressure, well depth, air drilling tool parameters, and vortex tube 140 air intake capacity to ensure that high pressure air enters the vortex tube 140 at high velocity.
During drilling, high pressure air enters the cooling chamber 110 through the drill stem of the air-drilling roller bit assembly 100. The high pressure air first enters the inner tube 120 of the cooling chamber 110, then passes through the communication member 125 at the lower portion of the cooling chamber 110, and then enters the vortex tube 140 through the high pressure air inlet port 144 of the vortex tube 140. According to the cooling principle of the vortex tube 140, the high-pressure air forms an outward swirling high-temperature air flow and an inward swirling low-temperature air flow in the vortex tube 140. The high temperature gas flow of the outward vortex flows toward the upper end of the vortex tube 140 and is discharged through the high temperature gas flow outlet 142, and the low temperature gas flow of the inward vortex flows toward the lower end of the vortex tube 140 and is discharged through the low temperature gas flow outlet 143.
In order to reduce the heat conduction of the high temperature outward swirling air flow generated by the vortex tube 140 and ensure the normal temperature of the air entering the cooling chamber 110, in a preferred embodiment, the inner cylinder 120 is provided with a thermal insulating coating. The heat-insulating coating structure of the inner cylinder 120 can not only ensure the temperature of the outward-rotating high-temperature airflow, but also reduce the influence of the inward-rotating low-temperature airflow by the high-temperature airflow, and effectively enhance the cooling effect of the cooling cavity 100.
According to the present invention, a roller cone bit 150 is provided at the downstream end of the outer barrel 130. The outer diameter of the outer cylinder 130 is set to be smaller than the maximum outer diameter of the roller cone bit 150. In a preferred embodiment, the outer diameter of the outer barrel 130 is set to be 10 to 20 mm smaller than the maximum outer diameter of the roller cone bit 150. Thus, in the drilling process, the air-drilling roller bit 100 can effectively avoid the excessive wear resistance of the drilling tool caused by the excessive outer diameter of the cooling cavity 110, and meanwhile, the size of the vortex tube 140 can be reasonably set, so that the cooling effect is further enhanced.
In accordance with the present invention, roller cone drill bit 150 includes a roller cone 152. In a preferred embodiment, there are a total of 3 cones 152 evenly distributed in the circumferential direction, each cone 152 being mounted to a respective one of the roller cone bits 150. Each cone 152 is mounted for connection to a roller cone bit 150 by a bearing. The structure of the roller bit 150 can particularly ensure that the air drilling roller bit device 100 has good stability during drilling, and can effectively enhance the rock breaking effect of the roller bit 150 and improve the rock breaking efficiency thereof.
In order to reduce the temperature of the bearing during drilling and to extend the service life of the bearing, it is necessary to cool the bearing during drilling operations. To this end, roller cone drill bit 150 is provided with a bearing cooling mechanism that includes a plurality of bearing cooling nozzles 160, one for each roller bearing. In a preferred embodiment, there are 3 bearing cooling nozzles 160, and each bearing cooling nozzle 160 corresponds to one bearing of the gear wheel for cooling the bearing of the gear wheel. Each bearing cooling nozzle 160 is disposed on the palm of cone 152, opposite the bottom of the cone bearing. Meanwhile, the bearing cooling nozzle 160 is communicated with the low-temperature airflow outlet 143 of the turbine tube 140 corresponding to the cooling cavity 110, and the communication flow channel is arranged inside the roller bit 150 and used for guiding the low-temperature airflow generated by the vortex tube 140 to the bearing cooling mechanism so as to spray and cool the roller bearing.
In this embodiment, during drilling, the low temperature gas stream formed in the vortex tube 140 is ejected through the bearing cooling nozzle 160, and the bearing is continuously ejected with the low temperature gas stream, thereby continuously cooling and cooling the bearing. The bearing cooling nozzle 160 effectively improves the working environment of the bearing of the roller cone, realizes the cooling of the bearing of the roller cone, effectively prolongs the service life of the bearing of the roller cone, and further improves the rock breaking efficiency of the air drilling roller bit device 100.
Because the occurrence temperature of the hot dry rock is extremely high, the low-temperature airflow is continuously sprayed to the high-temperature rock at the bottom of the well to be crushed, so that the large temperature difference of the rock at the bottom of the well can be artificially caused through the low-temperature airflow spraying, the hard and brittle rock at the bottom of the well generates obvious temperature change stress, the crushing is performed, and the rock crushing efficiency is effectively improved. To this end, the air-drilling roller cone bit assembly further includes a plurality of bottom hole cooling nozzles 170, the bottom hole cooling nozzles 170 being disposed between adjacent roller cones 152. In a preferred embodiment, there are 3 bottom hole cooling nozzles 170, each bottom hole cooling nozzle 170 being disposed between the legs of adjacent cones 152. Meanwhile, each of the bottom hole cooling nozzles 170 is connected to the low temperature gas flow outlet 143 of the vortex tube 140 in the corresponding cooling chamber 110. The communication flow path is built into the interior of roller cone drill bit 150.
In the drilling process, low-temperature airflow formed in the vortex tube 140 in the cooling cavity 110 is sprayed out through the bottom cooling nozzle 170 to continuously spray low-temperature airflow to bottom high-temperature rocks, so that the bottom high-temperature hard and brittle rocks generate obvious temperature-dependent stress, the high-temperature rocks are easy to break, the breaking efficiency of the air drilling roller bit device 100 is greatly improved, and the breaking effect of the high-temperature rocks is enhanced.
According to the present invention, a reverse injection pressurization mechanism is provided at an end of the cooling chamber 110 far from the roller bit 150 for reversely injecting a high pressure air flow to apply a drilling pressure to the air-drilling roller bit device 100 to improve the drilling efficiency thereof. The reverse injection boost mechanism includes a reverse injection boost nozzle 180. The reverse jet booster nozzle 180 is disposed at an end of the cooling cavity 110 remote from the roller cone bit 150. In a preferred embodiment, there are a total of 6 reverse jet booster nozzles 180. Each reverse jet booster nozzle 180 is connected to the high temperature gas flow outlet 142 of a corresponding vortex tube 140 in the cooling cavity 110. The communication flow passage is built in the inside of the cooling chamber 110.
In this embodiment, the high temperature gas stream formed by the vortex tube 140 in the cooling cavity 110 is ejected from the reverse jet plenum nozzle 180. And is then ejected uphole along the wellbore annulus, creating a reaction force that acts on the air-drilled roller cone device 100, artificially increasing the downward pressure on the roller cone 150. This pressure increases the depth to which the teeth of roller cone bit 150 bite into the formation, greatly enhancing the rock breaking effect. The reverse injection pressurizing nozzle 180 increases the drilling pressure of the well bottom drill bit, greatly increases the drilling speed of the air drilling roller bit device 100, and further increases the rock breaking efficiency of the roller bit 150.
In a preferred embodiment, a flow regulating valve (not shown) is provided in the cooling chamber 110 for regulating the velocity of the high temperature gas stream injected by the corresponding reverse injection pressurizing nozzle 180. The different injection speeds are generated by controlling the 6 reverse injection pressurizing nozzles 180, so that the nonuniform propelling force is provided for the air drilling roller bit device 100, and the directional drilling is performed towards the direction in which the deviation correction is desired, so that the deviation correction of the air drilling roller bit device 100 is realized. Of course, the inclination correction of the air-drilling roller bit device 100 can also be achieved by the method of asymmetrically arranging the reverse injection pressurizing nozzles 180.
The operation of the air-drilling roller cone bit assembly 100 according to the present invention is briefly described as follows. When hot dry rock resources are developed, the air drilling roller bit device 100 is put into the bottom of a well, and air drilling construction is further performed. During drilling, high-pressure air enters the inner pipe 120 of the cooling chamber 110 through the drill pipe, and then enters the vortex tube 140 through the communication member 125 at the lower part of the cooling chamber 110, thereby forming an outward swirling high-temperature air flow and an inward swirling low-temperature air flow. The internal rotation low-temperature gas flow flows to a low-temperature gas flow outlet 143 at the lower end of the vortex tube 140 and is ejected out through the drill bit internal flow passage, wherein a part of the internal rotation low-temperature gas flow is used for carrying out injection cooling on the bearing through a bearing cooling nozzle 160. And the other part of the internal rotation low-temperature airflow is used for spraying high-temperature rock at the bottom of the well through a bottom-hole cooling nozzle 170, so that the high-temperature rock at the bottom of the well generates obvious temperature change stress, and the crushing difficulty of the rock is reduced. The high-temperature outward-rotating air flow jets high-speed air flow in the opposite direction of the drilling hole through the reverse jet pressurizing nozzle 180, so that the generated reaction force is used for pressurizing the bit, and the drilling speed and the crushing efficiency of the air drilling roller bit device 100 are improved. In addition, the speed of the back injection of the externally swirling high temperature hot gas flow is controlled by adjusting a flow regulating valve provided in the cooling chamber 110. Thereby providing non-uniform thrust to air-drilling roller cone drill bit assembly 100 such that air-drilling roller cone drill bit assembly 100 is directed to drill in a direction in which deflection correction is desired, thereby achieving deflection correction of air-drilling roller cone drill bit 100.
The air-drilling roller bit device 100 according to the present invention employs a cooling chamber 110 having a double-layered heat-insulating tube structure of an inner tube 120 and an outer tube 130, and a vortex tube 140 is provided in the cooling chamber 110. According to the cooling principle of the vortex tube 140, the high-pressure air forms an outward swirling high-temperature air flow and an inward swirling low-temperature air flow in the vortex tube 140. Therefore, in the drilling process of the air drilling roller bit device 100, the bearings connected with the roller bit 150 are continuously sprayed with low-temperature air flow, so that the bearings are cooled, and the service life of the roller bit 150 under the high-temperature condition of hot dry rock is prolonged. Meanwhile, aiming at the hard stratum rock breaking requirement of dry and hot rock development, the low-temperature airflow is adopted to jet the high-temperature rock at the bottom of the well, so that the rock at the bottom of the well generates larger temperature stress, the rock is broken, and the rock breaking efficiency is greatly improved. In addition, the bit pressure acting on the air-drilling roller bit device 100 is increased by reversely jetting high-pressure and high-speed air flow, and the rock breaking efficiency is further improved. The air-drilling roller bit device 100 is also provided with a reverse injection well bottom deviation rectifying structure, and the air-drilling roller bit device 100 plays a role in timely deviation rectifying when deviating from the preset drilling direction. The air drilling roller bit device 100 can adapt to various complex and severe working conditions, particularly to a high-temperature and high-pressure construction environment for developing hot dry rock resources, and can effectively promote the development of hot dry rock geothermal resources and other new energy resources.
It will be readily appreciated that the air-drilling roller cone drill bit assembly 100 according to the present invention may also be adapted for use in developing other rock resources, and such similar applications are within the scope of the present invention.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An air-drilling roller bit assembly (100), comprising:
an inner drum (120) for receiving air and an outer drum (130) disposed outside the inner drum, a cooling cavity (110) being formed between the inner and outer drums;
a plurality of vortex tubes (140) disposed within the cooling chamber, the vortex tubes for converting air from the inner barrel into a high temperature air stream and a low temperature air stream;
a roller cone bit (150) mounted at one end of the outer barrel, the roller cone bit being provided with a bearing cooling mechanism,
a plurality of bottom hole cooling nozzles (170) arranged between adjacent roller cone drill bits, wherein the bottom hole cooling nozzles are communicated with the low-temperature airflow outlets (143) of the corresponding vortex tubes; and
the reverse injection pressurizing nozzle (180) is arranged at one end of the outer barrel, which is far away from the roller bit, and is communicated with the high-temperature airflow outlet (142) of the corresponding vortex tube;
wherein a part of the low-temperature airflow generated by the vortex tube is guided to the bearing cooling mechanism, the other part of the low-temperature airflow is sprayed to the bottom rock through the bottom cooling nozzle, and the high-temperature airflow generated by the vortex tube is sprayed out from the reverse spraying pressurization nozzle to form reaction force on the air-drilling roller bit device.
2. An air-drilling roller cone drill bit assembly according to claim 1, wherein a tubular communication member (125) is provided in the cooling chamber, the communication member being connected to the inner barrel and the vortex tube to provide air from the inner barrel to the vortex tube.
3. An air-drilling roller bit device according to claim 2, characterized in that a plurality of holes (126) are provided in the side wall of the tubular communication member, each hole being connected to a respective vortex tube.
4. An air-drilling roller cone drill bit assembly according to any one of claims 1 to 3, characterized in that the bearing cooling mechanism comprises a bearing cooling nozzle (160) in communication with the cryogenic gas flow outlet (143) of the corresponding vortex tube.
5. The air-drilling roller bit device according to any one of claims 1 to 3, wherein a flow regulating valve is provided in each of the vortex tubes, the flow regulating valve being configured to regulate a speed of the high-temperature air flow injected from the corresponding reverse injection pressurizing nozzle for performing the inclination correction of the air-drilling roller bit device.
6. The air-drilling roller bit device of any one of claims 1 to 3, wherein the reverse jet pressurization nozzles are asymmetrically arranged in a circumferential direction for performing an inclination correction of the air-drilling roller bit device.
7. An air-drilling roller bit arrangement according to claim 1 or 2, characterized in that a connection part (121) for connecting other drilling tools is provided at the end of the inner barrel remote from the roller bit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711407412.7A CN109958396B (en) | 2017-12-22 | 2017-12-22 | Air bores roller bit device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711407412.7A CN109958396B (en) | 2017-12-22 | 2017-12-22 | Air bores roller bit device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109958396A CN109958396A (en) | 2019-07-02 |
| CN109958396B true CN109958396B (en) | 2021-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711407412.7A Active CN109958396B (en) | 2017-12-22 | 2017-12-22 | Air bores roller bit device |
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| CN (1) | CN109958396B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112096303A (en) * | 2020-09-28 | 2020-12-18 | 西南石油大学 | Heat-insulating drill rod for cooling high-temperature well shaft and preparation method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3788408A (en) * | 1970-04-20 | 1974-01-29 | Dresser Ind | Rock bit water deflector and separator |
| US4245710A (en) * | 1978-07-03 | 1981-01-20 | Hughes Tool Company | Centrifugal water-air separation in earth drilling bits |
| CN2809186Y (en) * | 2005-06-24 | 2006-08-23 | 江汉石油钻头股份有限公司 | Flow channel structure of roller bit for mine |
| CN103670281B (en) * | 2013-12-27 | 2016-05-18 | 苏州思丹孚钻具有限公司 | Mix sealing rock bit |
| CN204175188U (en) * | 2014-09-26 | 2015-02-25 | 中国石油天然气股份有限公司 | Gas drilling bit and gas drilling system |
| CN105156039A (en) * | 2015-07-07 | 2015-12-16 | 西南石油大学 | Driving retractable combination drill bit |
| CN205297341U (en) * | 2015-11-25 | 2016-06-08 | 湖北鸣利来冶金机械股份有限公司 | Tricone drill bit with center nozzle holder |
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2017
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| CN109958396A (en) | 2019-07-02 |
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