CA2356570A1 - Air operated earth drilling tool - Google Patents
Air operated earth drilling tool Download PDFInfo
- Publication number
- CA2356570A1 CA2356570A1 CA 2356570 CA2356570A CA2356570A1 CA 2356570 A1 CA2356570 A1 CA 2356570A1 CA 2356570 CA2356570 CA 2356570 CA 2356570 A CA2356570 A CA 2356570A CA 2356570 A1 CA2356570 A1 CA 2356570A1
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- air
- passage
- intermediate portion
- passages
- deflector
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- Abandoned
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- 238000005553 drilling Methods 0.000 title claims abstract description 59
- 239000000356 contaminant Substances 0.000 claims abstract description 73
- 239000007787 solid Substances 0.000 claims abstract description 46
- 239000012530 fluid Substances 0.000 claims description 17
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000005755 formation reaction Methods 0.000 claims 4
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 description 10
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 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
- 238000007789 sealing Methods 0.000 description 1
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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/02—Fluid rotary type drives
-
- 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
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
- E21B21/103—Down-hole by-pass valve arrangements, i.e. between the inside of the drill string and the annulus
-
- 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
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
An air operated earth drilling tool includes a tubular housing having a first end, a second end, and an air flow passage. A filter adapted to remove solid contaminants is positioned at the first end of the housing. A metering valve is positioned on the air flow passage, whereby the volume of air passing through the downhole motor assembly is metered to provide a selected rotational speed. An inner mandrel with a central air flow passage is telescopically received in the second end of the housing and is rotatable relative to the housing. One or more rotatable power section are provided with outwardly extending vanes, such that air passing by the vanes rotates the power sections. The power sections are connected to the mandrel, such that rotation of the power section rotates the mandrel.
Description
TITLE OF THE INVENTION:
Air Operated Earth Drilling Tool FIELD OF THE INVENTION
The present invention relates to an air operated earth drilling tool.
BACKGROUND OF THE INVENTION
It has been determined that liquid drilling fluids circulated when drilling oil and gas wells have an undesirable side effect of sealing off portions of the formation. This has resulted in an increase in the use of gaseous drilling fluids, commonly referred to as "air drilling".
United States Patents 4,880,065 (McDonald et al 1989) and 4,936,397 (McDonald et al 1990) disclose air operated earth drilling tools. The McDonald 1989 reference discloses an air operated earth drilling tool that has a rotor with vanes. As air passes through the tool, the air contacts the vanes and imparts a rotary movement to the rotor. A gear reduction unit is provided to slow the drilling bit attachment end of the tool, to a desired rotations per minute. A conical screen is provided to capture contaminants which are carried in the air flow that might otherwise damage the tool. The McDonald 1990 reference discloses an air operated drilling tool that has a rotor and stator. A control valve is placed upstream of the tool in order to allow pressure to build up to deliver impulse energy to blow out accumulated well fluids and initiate operation of the tool after each joint of drill pipe is added to the drill string.
SU1~IARY OF THE INVENTION
The present invention relates to an alternative form of air operated earth drilling tool.
According to the present invention there is provided an air operated earth drilling tool which includes a tubular housing having a first end, a second end, and at least one air flow passage. A filter adapted to remove solid contaminants is positioned at the first end of the housing. A metering valve is positioned on the at least one air flow passage, whereby the volume of air passing through the downhole motor assembly is metered to provide a selected rotational speed.
An inner mandrel with a central air flow passage is telescopically received in the second end of the housing and is rotatable relative to the housing. Means is provided for diverting air flow from the at least one air flow passage of the housing to the central air flow passage of the mandrel.
At least one rotatable power section is disposed within the housing. The at least one power section has a plurality of outwardly extending vanes, such that air passing by the vanes rotates the at least one power section. Means is provided for connecting the power section to the mandrel, such that rotation of the power section rotates the mandrel.
with the air operated earth drilling tool, as described above, a speed is controlled by metering of the air flow rather than by the use of planetary speed reduction assemblies as taught by the McDonald et al 1989 reference.
Although beneficial results may be obtained through the use of the apparatus, as described above, McDonald et al 1990 required a control valve above the tool to allow pressure to build in order to blow out well fluids that enter the tool while adding additional sections of drill pipe to the pipe string. Even more beneficial results may, therefore, be obtained when a one way check valve is positioned in the central passage of the mandrel. This valve prevents fluids in the wellbore from entering the housing when the supply of air is turned off.
Although beneficial results may be obtained through the use of the air operated earth drilling tool, as described above, the McDonald et al 1989 reference included a conical filter for solid contaminants. The disadvantage of such a filter is that air flow is adversely affected as solid contaminants build up in the filter. Even more beneficial results may, therefore, be obtained when the filter includes a body having a first end, a second end, and an intermediate portion between the first end and the second end. At least one inlet passage extends inwardly from the first end and terminates past the intermediate portion in a blind bore which functions as a contaminant receiving receptacle. At least one outlet passage extends from the second end past the intermediate portion. At least one diversion passage extends at an angle from the intermediate portion back toward the first end of the body to intersect the at least one outlet passage.
Solid contaminants passing through the at least one inlet passage accumulate in the contaminant receiving receptacle while air escapes through the at least one diversion passage to the at least one outlet passage. This configuration removes the solid contaminants from the path the air travels.
Although beneficial results may be obtained through the use of the air operated earth drilling tool, as described above, the trap type solids contaminant filter functions better when at least one deflector is positioned in the intermediate portion in the path of the at least one inlet passage. The deflector has a plurality of apertures and is positioned upstream of the contaminant receiving receptacle. Solid contaminants which strike the at least one deflector pass through the plurality of apertures and accumulate in the contaminant receiving receptacle, while air is deflected.
Beneficial results have been obtained through the use of a single conical deflector.
Although the metering valve can take a number of forms, beneficial results have been obtained when the valve is incorporated into the filter between the at least one diversion passage and the at least one outlet passage. The valve determines what percentage of the at least one diversion passage remains in fluid communication with the at least one outlet passage. The valve is more effective when there are a plurality of diversions passages communicate with a plurality of outlet passages. The preferred form of valve includes a valve plate. The positioning of the valve plate determines what percentage of air flow passes through t:he at least one air passage. Beneficial results have been obtained through the use of a valve plate which is rotatable. There are various means by which the valve plate may be maintained in a selected rotational position, such as through the use of fasteners.
Although beneficial results may be obtained through the use of the air operated earth drilling tool, as described above, the torque requirements of various drilling applications may vary. Even more beneficial results may, therefore, be obtained when a plurality of modular power sections are provided. This enables torque to be adjusted by either adding or eliminating power sections.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIGURE 1 is a side elevation view, in section, of an air operated earth drilling tool constructed in accordance with the teachings of the present invention.
FIGURE 2 is a side elevation view, in section, of a filter containing a valve from the air operated earth drilling tool illustrated in FIGURE 1.
FIGURE 3 is a detailed side elevation view, in section, of a valve plate from filter containing a valve illustrated in FIGURE 2 from the air operated earth drilling tool filter illustrated in FIGURE 1.
FIGURE 4 is a top plan view, in section, of the filter containing a valve illustrated in FIGURE 2 from the air operated earth drilling tool illustrated in FIGURE 1, with the valve plate oriented to place the diversion passages in a full 5 open position relative to the outlet passages.
FIGURE 5 is a top plan view, in section, of the filter containing the valve illustrated in FIGURE 2 from the air operated earth drilling tool illustrated in FIGURE 1, with the valve plate oriented to place the diversion passages in a 75%
open position relative to the outlet passages.
FIGURE 6 is a top plan view, in section, of the filter containing a valve illustrated in FIGURE 2 from the air operated earth drilling tool illustrated in FIGURE 1, with the valve plate oriented to place the diversion passages in a 50%
open position relative to the outlet passages.
FIGURE 7 is a top plan view, in section, of the filter containing a valve illustrated in FIGURE 2 from the air operated earth drilling tool illustrated in FIGURE 1, with the valve plate oriented to place the diversion passages in a 25%
open position relative to the outlet passages.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment, an air operated earth drilling tool generally identified by reference numeral 100, will now be described with reference to FIGURES 1 through 7.
Structure and Relationship of Parts:
There will first be described a solids contaminant filter, generally identified by reference numeral 10. Referring to FIGURE 2, solid contaminants filter 10 has a body 12 with a first end 14, a second end 16, and an intermediate portion 18 between first end 14 and second end 16. An inlet passage 20 extends inwardly from first end 14 and terminates past intermediate portion 18 in a blind bore 22 which functions as a contaminant receiving receptacle 24. A deflector 26 is positioned in intermediate portion 18 in the path 28 of inlet passage 20. In the illustrated embodiment, deflector 26 is conical, however it will be appreciated that deflector 26 can be of a variety of alternate shapes and configurations.
Deflector 26 has a plurality of apertures 30 and is positioned upstream of contaminant receiving receptacle 24, such that solid contaminants which strike deflector 26 pass through plurality of apertures 30 and accumulate in contaminant receiving receptacle 24. A plurality of outlet passages 32 extend from second end 16 past intermediate portion 18. A
plurality of diversion passages 34 extend at an angle from intermediate portion 18 back toward first end 14 of body 12.
Each diversion passage 34 intersects with one of outlet passages 32, such that air deflected by deflector 26 escapes through diversion passages 34 to outlet passages 32.
Incorporated in to solids contaminant filter is a metering valve which includes a valve plate 36 disposed between diversion passages 34 and outlet passages 32. Referring to FIGURE 3, valve plate 36 has apertures 38 for air flow.
Referring to FIGURES 4, 5, 6 and 7, as will hereinafter be further described the positioning of apertures 38 of valve plate 36 determines what percentage of diversion passages 34 remain in fluid communication with outlet passages 32. Valve plate 36 is rotatable to vary the positioning of apertures 38 and then can be maintained in the selected rotational position by inserting a fastener pin 40 into a receiving slot 42 on valve plate 36.
Incorporation into a downhole motor assembly:
Referring to FIGURE 1, body 12 of solid contaminants filter 10 forms part of air operated earth drilling tool 100.
which includes a tubular housing 46 with a first end 48, a second end 50, and a peripheral air flow passage 52. Body 12 of solid contaminants filter 10 is positioned at first end 48 of housing 46. Referring to FIGURES 1 and 7, second end 16 of body 12 has exterior threads 54 adapted for threaded engagement with interior threads 56 at first end 48 of housing 46.
Referring to FIGURE 1, first end 14 of body 12 has interior threads 58 adapted to be threadably engaged with drill pipe.
Referring to FIGURE 7, an inner mandrel 60 with a central air flow passage 62 is telescopically received in second end 50 of housing 46. Inner mandrel 60 is rotatable relative to housing 46. Air flow channels 64 are provided for diverting air flow from peripheral air flow passage 52 of housing 46 to central air flow passage 62 of mandrel 60.
A plurality of modular power sections 66 are disposed within housing 46. Although the illustrated embodiment has two rotatable power sections 66, it will be appreciated that there could be only one, or alternatively more than two. Each power section 66 has a plurality of outwardly extending vanes 68, such that air passing by vanes 68 rotates power sections 66.
Power sections 66 are secured together by a connecting sleeve 70. Bearings 72 are provided on each power section 66 to facilitate rotation of vanes 68.
A threaded engagement 74 is provided for connecting power section 66 to mandrel 60, such that rotation of power sections 66 rotate mandrel 60. Bearings 76 are provided to facilitate rotation of mandrel 60. A one way check valve 78 is positioned in central passage 62 of mandrel 60 to prevent fluids in the wellbore from entering housing 46 when the supply of air is turned off. A seal 80 is also provided on mandrel 60 to prevent fluid from entering bearings 76.
Operation:
The use and operation of solid contaminants filter 10 will now be described with reference to FIGURES 1 through 7.
Referring to FIGURE 2, solid contaminants filter 10, as described above serves two functions when used for air drilling. One function of solids contaminants filter 10 is to capture solid contaminants in contaminant receiving receptacle 24 while letting air pass through. Solid contaminants are the rust and scale that tend to accumulate on the interior of a drilling pipe. As turbulence occurs, some solid contaminants break away. If allowed to pass along with air, solid contaminants cause damage to vanes 68 such that power sections 66 do not function as intended thereby interfering with the operation of air operating drilling tool 100. With solid contaminants filter 10 as described above, air is deflected by deflector 26 into diversion passages 34 while solid contaminants are collected in contaminant receiving receptacle 24. After passing through solid contaminants filter 10, air passes through vanes 68 in order to power air operated drilling tool 100.
Solid contaminants filter 10 also has incorporated in its construction a metering valve which serves a metering function whereby control is maintained over the volume of air passing through solid contaminants filter 10 and entering power section 66 to power air operated drilling tool 100. Referring to FIGURES 4, 5, 6 and 7, the volume of air passing through air operated drilling tool 100 to provide a selected rotational speed is metered by the positioning of valve plate 36 in solid contaminants filter 10. Valve plate 36 is rotated into a selected position to select the rotation speed required to operate air operated drilling tool 100. Referring to FIGURE 4, when valve plate 36 is oriented so as to place apertures 38 in full open alignment relative to diversion passages 34 and outlet passages 32, then maximum air flow is achieved.
Referring to FIGURE 5, when valve plate 36 is oriented to place apertures 38 in a 75% open position relative to diversion passages 34 and outlet passages 32, then air flow is at 75% of its maximum. Referring to FIGURE 6, when valve plate 36 is oriented to place apertures 38 in a 50% open position relative to diversion passages 34 and outlet passages 32, then air flow is reduced to 50% of its maximum. Referring to FIGURE 7, when valve plate 36 is oriented to place apertures 38 in a 25% open position relative to diversion passages 34 and outlet passages 32, then air flow is reduced to 25% of its maximum. By metering the air flow, rotational speed can be controlled to be optimum for the intended drilling application. When valve plate 36 has been rotated to the selected position, valve plate 36 is maintained in position by inserting fastener pin 40 into receiving slot 42 on valve plate 36. The maximum torque air operating drilling tool is capable of providing depends upon the number of power sections 66 is has. If there is not enough torque provided when valve plate 36 is in a full open position, additional power sections 66 must be added. It can be seen how air operated drilling tool can be adapted for any application by either adding or eliminating power sections and metering air flow via valve plate 36. By means of these two adjustments a desired rotational speed and output torque can be achieved.
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Air Operated Earth Drilling Tool FIELD OF THE INVENTION
The present invention relates to an air operated earth drilling tool.
BACKGROUND OF THE INVENTION
It has been determined that liquid drilling fluids circulated when drilling oil and gas wells have an undesirable side effect of sealing off portions of the formation. This has resulted in an increase in the use of gaseous drilling fluids, commonly referred to as "air drilling".
United States Patents 4,880,065 (McDonald et al 1989) and 4,936,397 (McDonald et al 1990) disclose air operated earth drilling tools. The McDonald 1989 reference discloses an air operated earth drilling tool that has a rotor with vanes. As air passes through the tool, the air contacts the vanes and imparts a rotary movement to the rotor. A gear reduction unit is provided to slow the drilling bit attachment end of the tool, to a desired rotations per minute. A conical screen is provided to capture contaminants which are carried in the air flow that might otherwise damage the tool. The McDonald 1990 reference discloses an air operated drilling tool that has a rotor and stator. A control valve is placed upstream of the tool in order to allow pressure to build up to deliver impulse energy to blow out accumulated well fluids and initiate operation of the tool after each joint of drill pipe is added to the drill string.
SU1~IARY OF THE INVENTION
The present invention relates to an alternative form of air operated earth drilling tool.
According to the present invention there is provided an air operated earth drilling tool which includes a tubular housing having a first end, a second end, and at least one air flow passage. A filter adapted to remove solid contaminants is positioned at the first end of the housing. A metering valve is positioned on the at least one air flow passage, whereby the volume of air passing through the downhole motor assembly is metered to provide a selected rotational speed.
An inner mandrel with a central air flow passage is telescopically received in the second end of the housing and is rotatable relative to the housing. Means is provided for diverting air flow from the at least one air flow passage of the housing to the central air flow passage of the mandrel.
At least one rotatable power section is disposed within the housing. The at least one power section has a plurality of outwardly extending vanes, such that air passing by the vanes rotates the at least one power section. Means is provided for connecting the power section to the mandrel, such that rotation of the power section rotates the mandrel.
with the air operated earth drilling tool, as described above, a speed is controlled by metering of the air flow rather than by the use of planetary speed reduction assemblies as taught by the McDonald et al 1989 reference.
Although beneficial results may be obtained through the use of the apparatus, as described above, McDonald et al 1990 required a control valve above the tool to allow pressure to build in order to blow out well fluids that enter the tool while adding additional sections of drill pipe to the pipe string. Even more beneficial results may, therefore, be obtained when a one way check valve is positioned in the central passage of the mandrel. This valve prevents fluids in the wellbore from entering the housing when the supply of air is turned off.
Although beneficial results may be obtained through the use of the air operated earth drilling tool, as described above, the McDonald et al 1989 reference included a conical filter for solid contaminants. The disadvantage of such a filter is that air flow is adversely affected as solid contaminants build up in the filter. Even more beneficial results may, therefore, be obtained when the filter includes a body having a first end, a second end, and an intermediate portion between the first end and the second end. At least one inlet passage extends inwardly from the first end and terminates past the intermediate portion in a blind bore which functions as a contaminant receiving receptacle. At least one outlet passage extends from the second end past the intermediate portion. At least one diversion passage extends at an angle from the intermediate portion back toward the first end of the body to intersect the at least one outlet passage.
Solid contaminants passing through the at least one inlet passage accumulate in the contaminant receiving receptacle while air escapes through the at least one diversion passage to the at least one outlet passage. This configuration removes the solid contaminants from the path the air travels.
Although beneficial results may be obtained through the use of the air operated earth drilling tool, as described above, the trap type solids contaminant filter functions better when at least one deflector is positioned in the intermediate portion in the path of the at least one inlet passage. The deflector has a plurality of apertures and is positioned upstream of the contaminant receiving receptacle. Solid contaminants which strike the at least one deflector pass through the plurality of apertures and accumulate in the contaminant receiving receptacle, while air is deflected.
Beneficial results have been obtained through the use of a single conical deflector.
Although the metering valve can take a number of forms, beneficial results have been obtained when the valve is incorporated into the filter between the at least one diversion passage and the at least one outlet passage. The valve determines what percentage of the at least one diversion passage remains in fluid communication with the at least one outlet passage. The valve is more effective when there are a plurality of diversions passages communicate with a plurality of outlet passages. The preferred form of valve includes a valve plate. The positioning of the valve plate determines what percentage of air flow passes through t:he at least one air passage. Beneficial results have been obtained through the use of a valve plate which is rotatable. There are various means by which the valve plate may be maintained in a selected rotational position, such as through the use of fasteners.
Although beneficial results may be obtained through the use of the air operated earth drilling tool, as described above, the torque requirements of various drilling applications may vary. Even more beneficial results may, therefore, be obtained when a plurality of modular power sections are provided. This enables torque to be adjusted by either adding or eliminating power sections.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIGURE 1 is a side elevation view, in section, of an air operated earth drilling tool constructed in accordance with the teachings of the present invention.
FIGURE 2 is a side elevation view, in section, of a filter containing a valve from the air operated earth drilling tool illustrated in FIGURE 1.
FIGURE 3 is a detailed side elevation view, in section, of a valve plate from filter containing a valve illustrated in FIGURE 2 from the air operated earth drilling tool filter illustrated in FIGURE 1.
FIGURE 4 is a top plan view, in section, of the filter containing a valve illustrated in FIGURE 2 from the air operated earth drilling tool illustrated in FIGURE 1, with the valve plate oriented to place the diversion passages in a full 5 open position relative to the outlet passages.
FIGURE 5 is a top plan view, in section, of the filter containing the valve illustrated in FIGURE 2 from the air operated earth drilling tool illustrated in FIGURE 1, with the valve plate oriented to place the diversion passages in a 75%
open position relative to the outlet passages.
FIGURE 6 is a top plan view, in section, of the filter containing a valve illustrated in FIGURE 2 from the air operated earth drilling tool illustrated in FIGURE 1, with the valve plate oriented to place the diversion passages in a 50%
open position relative to the outlet passages.
FIGURE 7 is a top plan view, in section, of the filter containing a valve illustrated in FIGURE 2 from the air operated earth drilling tool illustrated in FIGURE 1, with the valve plate oriented to place the diversion passages in a 25%
open position relative to the outlet passages.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment, an air operated earth drilling tool generally identified by reference numeral 100, will now be described with reference to FIGURES 1 through 7.
Structure and Relationship of Parts:
There will first be described a solids contaminant filter, generally identified by reference numeral 10. Referring to FIGURE 2, solid contaminants filter 10 has a body 12 with a first end 14, a second end 16, and an intermediate portion 18 between first end 14 and second end 16. An inlet passage 20 extends inwardly from first end 14 and terminates past intermediate portion 18 in a blind bore 22 which functions as a contaminant receiving receptacle 24. A deflector 26 is positioned in intermediate portion 18 in the path 28 of inlet passage 20. In the illustrated embodiment, deflector 26 is conical, however it will be appreciated that deflector 26 can be of a variety of alternate shapes and configurations.
Deflector 26 has a plurality of apertures 30 and is positioned upstream of contaminant receiving receptacle 24, such that solid contaminants which strike deflector 26 pass through plurality of apertures 30 and accumulate in contaminant receiving receptacle 24. A plurality of outlet passages 32 extend from second end 16 past intermediate portion 18. A
plurality of diversion passages 34 extend at an angle from intermediate portion 18 back toward first end 14 of body 12.
Each diversion passage 34 intersects with one of outlet passages 32, such that air deflected by deflector 26 escapes through diversion passages 34 to outlet passages 32.
Incorporated in to solids contaminant filter is a metering valve which includes a valve plate 36 disposed between diversion passages 34 and outlet passages 32. Referring to FIGURE 3, valve plate 36 has apertures 38 for air flow.
Referring to FIGURES 4, 5, 6 and 7, as will hereinafter be further described the positioning of apertures 38 of valve plate 36 determines what percentage of diversion passages 34 remain in fluid communication with outlet passages 32. Valve plate 36 is rotatable to vary the positioning of apertures 38 and then can be maintained in the selected rotational position by inserting a fastener pin 40 into a receiving slot 42 on valve plate 36.
Incorporation into a downhole motor assembly:
Referring to FIGURE 1, body 12 of solid contaminants filter 10 forms part of air operated earth drilling tool 100.
which includes a tubular housing 46 with a first end 48, a second end 50, and a peripheral air flow passage 52. Body 12 of solid contaminants filter 10 is positioned at first end 48 of housing 46. Referring to FIGURES 1 and 7, second end 16 of body 12 has exterior threads 54 adapted for threaded engagement with interior threads 56 at first end 48 of housing 46.
Referring to FIGURE 1, first end 14 of body 12 has interior threads 58 adapted to be threadably engaged with drill pipe.
Referring to FIGURE 7, an inner mandrel 60 with a central air flow passage 62 is telescopically received in second end 50 of housing 46. Inner mandrel 60 is rotatable relative to housing 46. Air flow channels 64 are provided for diverting air flow from peripheral air flow passage 52 of housing 46 to central air flow passage 62 of mandrel 60.
A plurality of modular power sections 66 are disposed within housing 46. Although the illustrated embodiment has two rotatable power sections 66, it will be appreciated that there could be only one, or alternatively more than two. Each power section 66 has a plurality of outwardly extending vanes 68, such that air passing by vanes 68 rotates power sections 66.
Power sections 66 are secured together by a connecting sleeve 70. Bearings 72 are provided on each power section 66 to facilitate rotation of vanes 68.
A threaded engagement 74 is provided for connecting power section 66 to mandrel 60, such that rotation of power sections 66 rotate mandrel 60. Bearings 76 are provided to facilitate rotation of mandrel 60. A one way check valve 78 is positioned in central passage 62 of mandrel 60 to prevent fluids in the wellbore from entering housing 46 when the supply of air is turned off. A seal 80 is also provided on mandrel 60 to prevent fluid from entering bearings 76.
Operation:
The use and operation of solid contaminants filter 10 will now be described with reference to FIGURES 1 through 7.
Referring to FIGURE 2, solid contaminants filter 10, as described above serves two functions when used for air drilling. One function of solids contaminants filter 10 is to capture solid contaminants in contaminant receiving receptacle 24 while letting air pass through. Solid contaminants are the rust and scale that tend to accumulate on the interior of a drilling pipe. As turbulence occurs, some solid contaminants break away. If allowed to pass along with air, solid contaminants cause damage to vanes 68 such that power sections 66 do not function as intended thereby interfering with the operation of air operating drilling tool 100. With solid contaminants filter 10 as described above, air is deflected by deflector 26 into diversion passages 34 while solid contaminants are collected in contaminant receiving receptacle 24. After passing through solid contaminants filter 10, air passes through vanes 68 in order to power air operated drilling tool 100.
Solid contaminants filter 10 also has incorporated in its construction a metering valve which serves a metering function whereby control is maintained over the volume of air passing through solid contaminants filter 10 and entering power section 66 to power air operated drilling tool 100. Referring to FIGURES 4, 5, 6 and 7, the volume of air passing through air operated drilling tool 100 to provide a selected rotational speed is metered by the positioning of valve plate 36 in solid contaminants filter 10. Valve plate 36 is rotated into a selected position to select the rotation speed required to operate air operated drilling tool 100. Referring to FIGURE 4, when valve plate 36 is oriented so as to place apertures 38 in full open alignment relative to diversion passages 34 and outlet passages 32, then maximum air flow is achieved.
Referring to FIGURE 5, when valve plate 36 is oriented to place apertures 38 in a 75% open position relative to diversion passages 34 and outlet passages 32, then air flow is at 75% of its maximum. Referring to FIGURE 6, when valve plate 36 is oriented to place apertures 38 in a 50% open position relative to diversion passages 34 and outlet passages 32, then air flow is reduced to 50% of its maximum. Referring to FIGURE 7, when valve plate 36 is oriented to place apertures 38 in a 25% open position relative to diversion passages 34 and outlet passages 32, then air flow is reduced to 25% of its maximum. By metering the air flow, rotational speed can be controlled to be optimum for the intended drilling application. When valve plate 36 has been rotated to the selected position, valve plate 36 is maintained in position by inserting fastener pin 40 into receiving slot 42 on valve plate 36. The maximum torque air operating drilling tool is capable of providing depends upon the number of power sections 66 is has. If there is not enough torque provided when valve plate 36 is in a full open position, additional power sections 66 must be added. It can be seen how air operated drilling tool can be adapted for any application by either adding or eliminating power sections and metering air flow via valve plate 36. By means of these two adjustments a desired rotational speed and output torque can be achieved.
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Claims (26)
1. An air operated earth drilling tool, comprising:
a tubular housing having a first end, a second end, and at least one air flow passage;
a filter adapted to remove solid contaminants positioned at the first end of the housing;
a metering valve positioned on the at least one air flow passage, whereby the volume of air passing through the downhole motor assembly is metered to provide a selected rotational speed;
an inner mandrel with a central air flow passage, telescopically received in the second end of the housing, the inner mandrel being rotatable relative to the housing;
means for diverting air flow from the at least one air flow passage of the housing to the central air flow passage of the mandrel;
at least one rotatable power section disposed within the housing, the at least one power section having a plurality of outwardly extending vanes, such that air passing by the vanes rotates the at least one power section;
means for connecting the at least one power section to the mandrel, such that rotation of the at least one power section rotates the mandrel.
a tubular housing having a first end, a second end, and at least one air flow passage;
a filter adapted to remove solid contaminants positioned at the first end of the housing;
a metering valve positioned on the at least one air flow passage, whereby the volume of air passing through the downhole motor assembly is metered to provide a selected rotational speed;
an inner mandrel with a central air flow passage, telescopically received in the second end of the housing, the inner mandrel being rotatable relative to the housing;
means for diverting air flow from the at least one air flow passage of the housing to the central air flow passage of the mandrel;
at least one rotatable power section disposed within the housing, the at least one power section having a plurality of outwardly extending vanes, such that air passing by the vanes rotates the at least one power section;
means for connecting the at least one power section to the mandrel, such that rotation of the at least one power section rotates the mandrel.
2. The air operated earth drilling tool as defined in Claim 1, wherein a one way check valve is positioned in the central passage of the mandrel thereby preventing fluids in the wellbore from entering the housing when the supply of air is turned off.
3. The air operated earth drilling tool as defined in Claim 1, wherein the filter is comprised of:
a body having a first end, a second end, and an intermediate portion between the first end and the second end;
at least one inlet passage extending inwardly from the first end and terminating past the intermediate portion in a blind bore which functions as a contaminant receiving receptacle;
at least one outlet passage extending from the second end past the intermediate portion; and at least one diversion passage extending at an angle from the intermediate portion back toward the first end of the body to intersect the at least one outlet passage, such that solid contaminants passing through the at least one inlet passage accumulate in the contaminant receiving receptacle while air escapes through the at least one diversion passage to the at least one outlet passage.
a body having a first end, a second end, and an intermediate portion between the first end and the second end;
at least one inlet passage extending inwardly from the first end and terminating past the intermediate portion in a blind bore which functions as a contaminant receiving receptacle;
at least one outlet passage extending from the second end past the intermediate portion; and at least one diversion passage extending at an angle from the intermediate portion back toward the first end of the body to intersect the at least one outlet passage, such that solid contaminants passing through the at least one inlet passage accumulate in the contaminant receiving receptacle while air escapes through the at least one diversion passage to the at least one outlet passage.
4. The air operated earth drilling tool as defined in Claim 3, wherein at least one deflector is positioned in the intermediate portion in the path of the at least one inlet passage, the at least one deflector having a plurality of apertures and being positioned upstream of the contaminant receiving receptacle, such that solid contaminants which strike the at least one deflector pass through the plurality of apertures and accumulate in the contaminant receiving receptacle.
5. The air operated earth drilling tool as defined in Claim 4, wherein the deflector is conical.
6. The air operated earth drilling tool as defined in Claim 3, wherein the valve is incorporated into the filter between the at least one diversion passage and the at least one outlet passage, the valve determining what percentage of the at least one diversion passage remains in fluid communication with the at least one outlet passage.
7. The air operated earth drilling tool as defined in Claim 3, wherein there are a plurality of diversions passages communicate with a plurality of outlet passages.
8. The air operated earth drilling tool as defined in Claim 1, wherein the valve includes a valve plate, the positioning of the valve plate determining what percentage of air flow passes through the at least one air passage.
9. The air operated earth drilling tool as defined in Claim 8, wherein the valve plate is rotatable.
10. The air operated earth drilling tool as defined in Claim 9, wherein the valve plate is maintained in a selected rotational position by fasteners.
11. The air operated earth drilling tool as defined in Claim 1, wherein a plurality of modular power sections are provided, whereby torque is adjusted by either adding or eliminating power sections.
12. An air operated earth drilling tool for use when air drilling through earth formations, comprising:
a tubular housing having a first end, a second end, and at least one air flow passage;
a filter adapted to remove solid contaminants positioned at the first end of the housing;
a metering valve positioned on the at least one air flow passage, whereby the volume of air passing through the downhole motor assembly is metered to provide a selected rotational speed;
an inner mandrel with a central air flow passage, telescopically received in the second end of the housing, the inner mandrel being rotatable relative to the housing;
means for diverting air flow from the at least one air flow passage of the housing to the central air flow passage of the mandrel;
at least one rotatable power section disposed within the housing, the at least one power section having a plurality of outwardly extending vanes, such that air passing by the vanes rotates the at least one power section;
means for connecting the at least one power section to the mandrel, such that rotation of the at least one power section rotates the mandrel; and the filter including:
a body having a first end, a second end, and an intermediate portion between the first end and the second end;
an inlet passage extending inwardly from the first end and terminating past the intermediate portion in a blind bore which functions as a contaminant receiving receptacle;
a deflector positioned in the intermediate portion in the path of the inlet passage, the deflector having a plurality of apertures and being positioned upstream of the contaminant receiving receptacle, such that solid contaminants which strike the deflector pass through the plurality of apertures and accumulate in the contaminant receiving receptacle;
a plurality of outlet passages extending from the second end past the intermediate portion;
a plurality of diversion passages extending at an angle from the intermediate portion back toward the first end of the body, each of the plurality of diversion passages intersecting one of the plurality of outlet passages, such that air deflected by the deflector escapes through the plurality of diversion passages to the plurality of outlet passages;
the valve including:
a valve plate disposed between the plurality of diversion passages and the plurality of outlet passages, the positioning of the valve determining what percentage of each of the plurality of diversion passages remain in fluid communication with the plurality of outlet passages.
a tubular housing having a first end, a second end, and at least one air flow passage;
a filter adapted to remove solid contaminants positioned at the first end of the housing;
a metering valve positioned on the at least one air flow passage, whereby the volume of air passing through the downhole motor assembly is metered to provide a selected rotational speed;
an inner mandrel with a central air flow passage, telescopically received in the second end of the housing, the inner mandrel being rotatable relative to the housing;
means for diverting air flow from the at least one air flow passage of the housing to the central air flow passage of the mandrel;
at least one rotatable power section disposed within the housing, the at least one power section having a plurality of outwardly extending vanes, such that air passing by the vanes rotates the at least one power section;
means for connecting the at least one power section to the mandrel, such that rotation of the at least one power section rotates the mandrel; and the filter including:
a body having a first end, a second end, and an intermediate portion between the first end and the second end;
an inlet passage extending inwardly from the first end and terminating past the intermediate portion in a blind bore which functions as a contaminant receiving receptacle;
a deflector positioned in the intermediate portion in the path of the inlet passage, the deflector having a plurality of apertures and being positioned upstream of the contaminant receiving receptacle, such that solid contaminants which strike the deflector pass through the plurality of apertures and accumulate in the contaminant receiving receptacle;
a plurality of outlet passages extending from the second end past the intermediate portion;
a plurality of diversion passages extending at an angle from the intermediate portion back toward the first end of the body, each of the plurality of diversion passages intersecting one of the plurality of outlet passages, such that air deflected by the deflector escapes through the plurality of diversion passages to the plurality of outlet passages;
the valve including:
a valve plate disposed between the plurality of diversion passages and the plurality of outlet passages, the positioning of the valve determining what percentage of each of the plurality of diversion passages remain in fluid communication with the plurality of outlet passages.
13. The air operated earth drilling tool as defined in Claim 12, wherein the deflector is conical.
14. The air operated earth drilling tool as defined in Claim 12, wherein the valve plate is rotatable, the valve plate being maintained in a selected rotational position by fasteners.
15. The air operated earth drilling tool as defined in Claim 12, wherein a one way check valve is positioned in the central passage of the mandrel thereby preventing fluids in the wellbore from entering the downhole motor assembly when the supply of air is turned off.
16. The air operated earth drilling tool as defined in Claim 12, wherein a plurality of modular power sections are provided, whereby torque is adjusted by either adding or eliminating power sections.
17. An air operated earth drilling tool for use when air drilling through earth formations, comprising:
a tubular housing having a first end, a second end, and at least one air flow passage;
a filter adapted to remove solid contaminants positioned at the first end of the housing;
a metering valve positioned on the at least one air flow passage, whereby the volume of air passing through the downhole motor assembly is metered to provide a selected rotational speed;
an inner mandrel with a central air flow passage, telescopically received in the second end of the housing, the inner mandrel being rotatable relative to the housing;
means for diverting air flow from the at least one air flow passage of the housing to the central air flow passage of the mandrel;
a plurality of rotatable power section disposed within the housing, each of the plurality of power sections having a plurality of outwardly extending vanes, such that air passing by the vanes rotates the at least one power section, the housing being modular to permit the addition and elimination of power sections, whereby torque is adjusted by either adding or eliminating power sections;
means for connecting the plurality of power sections to the mandrel, such that rotation of the plurality of power sections serves to rotate the mandrel;
the filter including:
a body having a first end, a second end, and an intermediate portion between the first end and the second end;
an inlet passage extending inwardly from the first end and terminating past the intermediate portion in a blind bore which functions as a contaminant receiving receptacle;
a conical deflector positioned in the intermediate portion in the path of the inlet passage, the deflector having a plurality of apertures and being positioned upstream of the contaminant receiving receptacle, such that solid contaminants which strike the deflector pass through the plurality of apertures and accumulate in the contaminant receiving receptacle;
a plurality of outlet passages extending from the second end past the intermediate portion;
a plurality of diversion passages extending at an angle from the intermediate portion back toward the first end of the body, each of the plurality of diversion passages intersecting one of the plurality of outlet passages, such that air deflected by the deflector escapes through the plurality of diversion passages to the plurality of outlet passages;
the valve including:
a rotatable valve plate disposed between the plurality of diversion passages and the plurality of outlet passages, the positioning of the valve determining what percentage of each of the plurality of diversion passages remain in fluid communication with the plurality of outlet passages, the valve plate being maintained in a selected rotational position by fasteners; and a one way check valve positioned in the central passage of the mandrel thereby preventing fluids in the wellbore from entering the downhole motor assembly when the supply of air is turned off.
a tubular housing having a first end, a second end, and at least one air flow passage;
a filter adapted to remove solid contaminants positioned at the first end of the housing;
a metering valve positioned on the at least one air flow passage, whereby the volume of air passing through the downhole motor assembly is metered to provide a selected rotational speed;
an inner mandrel with a central air flow passage, telescopically received in the second end of the housing, the inner mandrel being rotatable relative to the housing;
means for diverting air flow from the at least one air flow passage of the housing to the central air flow passage of the mandrel;
a plurality of rotatable power section disposed within the housing, each of the plurality of power sections having a plurality of outwardly extending vanes, such that air passing by the vanes rotates the at least one power section, the housing being modular to permit the addition and elimination of power sections, whereby torque is adjusted by either adding or eliminating power sections;
means for connecting the plurality of power sections to the mandrel, such that rotation of the plurality of power sections serves to rotate the mandrel;
the filter including:
a body having a first end, a second end, and an intermediate portion between the first end and the second end;
an inlet passage extending inwardly from the first end and terminating past the intermediate portion in a blind bore which functions as a contaminant receiving receptacle;
a conical deflector positioned in the intermediate portion in the path of the inlet passage, the deflector having a plurality of apertures and being positioned upstream of the contaminant receiving receptacle, such that solid contaminants which strike the deflector pass through the plurality of apertures and accumulate in the contaminant receiving receptacle;
a plurality of outlet passages extending from the second end past the intermediate portion;
a plurality of diversion passages extending at an angle from the intermediate portion back toward the first end of the body, each of the plurality of diversion passages intersecting one of the plurality of outlet passages, such that air deflected by the deflector escapes through the plurality of diversion passages to the plurality of outlet passages;
the valve including:
a rotatable valve plate disposed between the plurality of diversion passages and the plurality of outlet passages, the positioning of the valve determining what percentage of each of the plurality of diversion passages remain in fluid communication with the plurality of outlet passages, the valve plate being maintained in a selected rotational position by fasteners; and a one way check valve positioned in the central passage of the mandrel thereby preventing fluids in the wellbore from entering the downhole motor assembly when the supply of air is turned off.
18. A solid contaminants filter for use when air drilling through earth formations, comprising:
a body having a first end, a second end, and an intermediate portion between the first end and the second end;
at least one inlet passage extending inwardly from the first end and terminating past the intermediate portion in a blind bore which functions as a contaminant receiving receptacle;
at least one outlet passage extending from the second end past the intermediate portion; and at least one diversion passage extending at an angle from the intermediate portion back toward the first end of the body to intersect the at least one outlet passage, such that solid contaminants passing through the at least one inlet passage accumulate in the contaminant receiving receptacle while air escapes through the at least one diversion passage to the at least one outlet passage.
a body having a first end, a second end, and an intermediate portion between the first end and the second end;
at least one inlet passage extending inwardly from the first end and terminating past the intermediate portion in a blind bore which functions as a contaminant receiving receptacle;
at least one outlet passage extending from the second end past the intermediate portion; and at least one diversion passage extending at an angle from the intermediate portion back toward the first end of the body to intersect the at least one outlet passage, such that solid contaminants passing through the at least one inlet passage accumulate in the contaminant receiving receptacle while air escapes through the at least one diversion passage to the at least one outlet passage.
19. The solid contaminants filter as defined in Claim 18, wherein at least one deflector is positioned in the intermediate portion in the path of the at least one inlet passage, the at least one deflector having a plurality of apertures and being positioned upstream of the contaminant receiving receptacle, such that solid contaminants which strike the at least one deflector pass through the plurality of apertures and accumulate in the contaminant receiving receptacle.
20. The solid contaminants filter as defined in Claim 19, wherein the deflector is conical.
21. The solid contaminants filter as defined in Claim 18 wherein a valve is disposed between the at least one diversion passage and the at least one outlet passage, the valve determining what percentage of the at least one diversion passage remains in fluid communication with the at least one outlet passage.
22. The solid contaminants filter as defined in Claim 18, wherein there are a plurality of diversions passages communicate with a plurality of outlet passages.
23. A solid contaminants filter for use when air drilling through earth formations, comprising:
a body having a first end, a second end, and an intermediate portion between the first end and the second end;
an inlet passage extending inwardly from the first end and terminating past the intermediate portion in a blind bore which functions as a contaminant receiving receptacle;
a deflector positioned in the intermediate portion in the path of the inlet passage, the deflector having a plurality of apertures and being positioned upstream of the contaminant receiving receptacle, such that solid contaminants which strike the deflector pass through the plurality of apertures and accumulate in the contaminant receiving receptacle;
a plurality of outlet passages extending from the second end past the intermediate portion;
a plurality of diversion passages extending at an angle from the intermediate portion back toward the first end of the body, each of the plurality of diversion passages intersecting one of the plurality of outlet passages, such that air deflected by the deflector escapes through the plurality of diversion passages to the plurality of outlet passages;
a valve plate disposed between the plurality of diversion passages and the plurality of outlet passages, the positioning of the valve determining what percentage of each of the plurality of diversion passages remain in fluid communication with the plurality of outlet passages.
a body having a first end, a second end, and an intermediate portion between the first end and the second end;
an inlet passage extending inwardly from the first end and terminating past the intermediate portion in a blind bore which functions as a contaminant receiving receptacle;
a deflector positioned in the intermediate portion in the path of the inlet passage, the deflector having a plurality of apertures and being positioned upstream of the contaminant receiving receptacle, such that solid contaminants which strike the deflector pass through the plurality of apertures and accumulate in the contaminant receiving receptacle;
a plurality of outlet passages extending from the second end past the intermediate portion;
a plurality of diversion passages extending at an angle from the intermediate portion back toward the first end of the body, each of the plurality of diversion passages intersecting one of the plurality of outlet passages, such that air deflected by the deflector escapes through the plurality of diversion passages to the plurality of outlet passages;
a valve plate disposed between the plurality of diversion passages and the plurality of outlet passages, the positioning of the valve determining what percentage of each of the plurality of diversion passages remain in fluid communication with the plurality of outlet passages.
24. The solid contaminants filter as defined in Claim 23, wherein the deflector is conical.
25. The solid contaminants filter as defined in Claim 23, wherein the valve plate is rotatable.
26. The solid contaminants filter as defined in Claim 25, wherein the valve plate is maintained in a selected rotational position by fasteners.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2356570 CA2356570A1 (en) | 2001-09-05 | 2001-09-05 | Air operated earth drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2356570 CA2356570A1 (en) | 2001-09-05 | 2001-09-05 | Air operated earth drilling tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2356570A1 true CA2356570A1 (en) | 2003-03-05 |
Family
ID=4169882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2356570 Abandoned CA2356570A1 (en) | 2001-09-05 | 2001-09-05 | Air operated earth drilling tool |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2356570A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213829A (en) * | 2014-08-27 | 2014-12-17 | 中国石油集团川庆钻探工程有限公司 | gas drilling underground power drilling tool |
| EP3333356A1 (en) * | 2016-12-07 | 2018-06-13 | BAUER Maschinen GmbH | Rotary drilling tool and method for creating a hole in the soil |
-
2001
- 2001-09-05 CA CA 2356570 patent/CA2356570A1/en not_active Abandoned
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213829A (en) * | 2014-08-27 | 2014-12-17 | 中国石油集团川庆钻探工程有限公司 | gas drilling underground power drilling tool |
| CN104213829B (en) * | 2014-08-27 | 2016-08-17 | 中国石油集团川庆钻探工程有限公司 | gas drilling underground power drilling tool |
| EP3333356A1 (en) * | 2016-12-07 | 2018-06-13 | BAUER Maschinen GmbH | Rotary drilling tool and method for creating a hole in the soil |
| WO2018103919A1 (en) * | 2016-12-07 | 2018-06-14 | Bauer Maschinen Gmbh | Drilling tool and method for producing a bore in the ground |
| CN110036177A (en) * | 2016-12-07 | 2019-07-19 | 包尔机械有限公司 | For generating the boring bar tool and method in hole in ground |
| US10927624B2 (en) | 2016-12-07 | 2021-02-23 | Bauer Maschinen Gmbh | Rotary drilling tool and method for producing a bore in the ground |
| CN110036177B (en) * | 2016-12-07 | 2021-06-04 | 包尔机械有限公司 | Rotary drilling tool and method for producing a hole in the ground |
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Legal Events
| Date | Code | Title | Description |
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| EEER | Examination request | ||
| FZDE | Dead |