CN111946268B - Rotational flow drilling bit - Google Patents
Rotational flow drilling bit Download PDFInfo
- Publication number
- CN111946268B CN111946268B CN202010854421.6A CN202010854421A CN111946268B CN 111946268 B CN111946268 B CN 111946268B CN 202010854421 A CN202010854421 A CN 202010854421A CN 111946268 B CN111946268 B CN 111946268B
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- China
- Prior art keywords
- fixed
- sleeve
- drill bit
- mounting seat
- water outlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000005553 drilling Methods 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 241000883990 Flabellum Species 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 12
- 239000000428 dust Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000009323 psychological health Effects 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
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B12/00—Accessories for drilling tools
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The invention discloses a rotational flow well drilling drill bit which comprises an installation seat, wherein a fixed sleeve is fixed at the bottom end of the installation seat, a connecting sleeve movably penetrates through the inner side of the fixed sleeve, the connecting sleeve extends to the outer wall of the bottom end of the fixed sleeve, and a drill bit is fixed at the tail end of the connecting sleeve; a cavity is formed in the mounting seat, a forward and reverse rotation motor is fixed in the cavity, an output shaft of the forward and reverse rotation motor is rotatably connected with a lead screw, the lead screw rotatably penetrates through the outer wall of the top end of the fixed sleeve, one side of the lead screw, which is far away from the forward and reverse rotation motor, extends into the connecting sleeve and is rotatably sleeved with a ball nut on the outer wall, and the ball nut is fixed on the inner side of the connecting sleeve; a water guide groove is formed in the screw rod, a connecting pipe penetrates through the outer wall of the bottom end of the mounting seat, and one side, far away from the mounting seat, of the connecting pipe extends to the inside of the water guide groove; the surfaces of the two sides of the screw rod, the connecting sleeve and the fixing sleeve are respectively provided with a first water outlet, a second water outlet and a third water outlet which correspond to the diversion water tank.
Description
Technical Field
The invention relates to the technical field of rotational flow drilling, in particular to a rotational flow drilling bit.
Background
During drilling, the drill bit is the primary tool for breaking rock and the borehole is formed by the drill bit breaking rock. The length of time a wellbore can take to form is related to the degree of mutual matching between the drill bit and the formation, in addition to the characteristics of the rock of the formation being drilled and the properties of the drill bit itself. The reasonable type selection of the drill bit plays an important role in improving the drilling speed and reducing the comprehensive drilling cost.
However, the existing drill bit still has some disadvantages, when drilling, due to the difference of the drilling depth, the drill bit matched with the drill bit needs to be installed before drilling at each time to perform the subsequent drilling work, so that the drilling efficiency is not high, and the dust generated during the work can influence the health of workers, so that the swirl drilling drill bit is provided.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the rotational flow drilling bit, the length of the bit can be conveniently and rapidly adjusted through the arranged adjusting mechanism, dust falling effect can be realized on dust during drilling, the drilling effect of the bit is further ensured, the life safety of workers is also ensured, and the working efficiency and the practicability of the bit are improved.
In order to solve the technical problems, the invention provides the following technical scheme: a rotational flow well drilling drill bit comprises a mounting seat, wherein a fixed sleeve is fixed at the bottom end of the mounting seat, a connecting sleeve movably penetrates through the inner side of the fixed sleeve, the connecting sleeve extends to the outer wall of the bottom end of the fixed sleeve, and a drill bit is fixed at the tail end of the connecting sleeve; a cavity is formed in the mounting seat, a forward and reverse rotation motor is fixed in the cavity, an output shaft of the forward and reverse rotation motor is rotatably connected with a screw rod, the screw rod rotatably penetrates through the outer wall of the top end of the fixed sleeve, one side of the screw rod, far away from the forward and reverse rotation motor, extends into the connecting sleeve and is rotatably sleeved with a ball nut on the outer wall, and the ball nut is fixed on the inner side of the connecting sleeve; a flow guide water tank is arranged inside the screw rod, a connecting pipe penetrates through the outer wall of the bottom end of the mounting seat, and one side, far away from the mounting seat, of the connecting pipe extends to the inside of the flow guide water tank; first water outlet holes corresponding to the water diversion water tanks are formed in the surfaces of the two sides of the screw rod, second water outlet holes corresponding to the first water outlet holes are formed in the surfaces of the two sides of the connecting sleeve, and third water outlet holes corresponding to the second water outlet holes are formed in the surfaces of the two sides of the fixing sleeve.
As a preferred technical scheme of the invention, fixed blocks are fixed on the two side surfaces of the screw rod in the cavity of the mounting seat, and fan blades are fixed on the surface of one side of each fixed block; symmetrical radiating ports are formed in the bottom end of the mounting seat, and dustproof filter screens are fixed inside the radiating ports through bolts.
As a preferred technical scheme of the invention, the surface of the fan blade is provided with holes which are distributed at equal intervals, and the fan blade is made of resin.
As a preferable technical scheme of the invention, a water pump is fixed at the tail end of the connecting pipe, and an output shaft of the water pump is connected with a water tank through a water pipe.
As a preferred technical scheme of the invention, the surface of the dustproof filter screen is provided with uniformly distributed filter holes, and the dustproof filter screen is made of stainless steel.
As a preferred technical scheme of the invention, the outer surface of the mounting seat is sleeved with a sealing ring, and the surface of the sealing ring is provided with anti-skid lines.
As a preferable technical scheme of the invention, the fixed sleeve is provided with the anti-collision strips which are distributed in an S shape at equal intervals.
As a preferred technical scheme of the invention, a protective sleeve is sleeved on the outer surface of the connecting pipe, and the protective sleeve is made of elastic rubber.
As a preferable technical scheme of the invention, a cavity is formed in the drill bit, and a bearing block is fixed in the cavity.
Compared with the prior art, the invention can achieve the following beneficial effects:
1. through the arranged forward and reverse rotating motor, the problem that during drilling, due to the difference of drilling depths, after drilling work can be carried out only by installing a matched drill bit before drilling each time is effectively avoided, so that the drilling efficiency is not high, the body health of workers can be influenced by dust generated during working, the length of the drill bit can be conveniently and quickly adjusted, meanwhile, the dust falling effect on the dust during drilling can be realized, the drilling effect of the drill bit is further ensured, the life safety of the workers is also ensured, and the working efficiency and the practicability of the drill bit are improved;
2. through the flabellum that sets up, effectively avoided when just reversing motor after long-time work, just reversing motor's calorific capacity can increase for damage may appear in the part on the motor just reversing, reduced the life of just reversing motor then, make the wind-force that the flabellum produced when rotating can cool down the motor just reversing under operating condition, provide safe operational environment for just reversing the motor, guaranteed then just reversing the normal work operation of motor.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the fixing sleeve and the connecting sleeve of FIG. 1 according to the present invention;
FIG. 3 is an enlarged view of A of FIG. 2 according to the present invention;
wherein: 1. a mounting base; 2. fixing the sleeve; 3. a connecting sleeve; 4. a drill bit; 5. a connecting pipe; 6. a positive and negative rotation motor; 7. a screw rod; 8. a ball nut; 9. a diversion water tank; 10. a first water outlet; 11. a second water outlet; 12. a third water outlet; 13. a fixed block; 14. a fan blade; 15. a heat dissipation port; 16. dustproof filter screen.
Detailed Description
The present invention will be further described with reference to specific embodiments for the purpose of facilitating an understanding of technical means, characteristics of creation, objectives and functions realized by the present invention, but the following embodiments are only preferred embodiments of the present invention, and are not intended to be exhaustive. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. The experimental procedures in the following examples were carried out in a conventional manner unless otherwise specified, and materials, reagents and the like used in the following examples were commercially available unless otherwise specified.
Example (b):
as shown in fig. 1 and 2, the rotational flow well drilling bit comprises an installation base 1, wherein a fixed sleeve 2 is fixed at the bottom end of the installation base 1, a connecting sleeve 3 movably penetrates through the inner side of the fixed sleeve 2, the connecting sleeve 3 extends to the outer wall of the bottom end of the fixed sleeve 2, and a bit 4 is fixed at the tail end of the connecting sleeve 3; a cavity is formed in the mounting base 1, a forward and reverse rotation motor 6 is fixed in the cavity, an output shaft of the forward and reverse rotation motor 6 is rotatably connected with a screw rod 7, the screw rod 7 rotatably penetrates through the outer wall of the top end of the fixed sleeve 2, one side, far away from the forward and reverse rotation motor 6, of the screw rod 7 extends into the connecting sleeve 3 and is rotatably sleeved with a ball nut 8, and the ball nut 8 is fixed on the inner side of the connecting sleeve 3; a diversion water tank 9 is arranged inside the screw rod 7, a connecting pipe 5 penetrates through the outer wall of the bottom end of the mounting seat 1, and one side, far away from the mounting seat 1, of the connecting pipe 5 extends to the inside of the diversion water tank 9; the two side surfaces of the screw rod 7 are respectively provided with a first water outlet hole 10 corresponding to the water diversion tank 9, the two side surfaces of the connecting sleeve 3 are respectively provided with a second water outlet hole 11 corresponding to the first water outlet hole 10, and the two side surfaces of the fixed sleeve 2 are respectively provided with a third water outlet hole 12 corresponding to the second water outlet hole 11;
when adjusting the length of the drill bit 4, when falling dust, at first, the forward and reverse rotation motor 6 is started, so that the screw rod 7 can rotate, the ball nut 8 is driven to rotate in a thread manner on the outer wall of the screw rod 7, then the connecting sleeve 3 is driven to move up and down on the inner side of the fixed sleeve 2, so that the length of the drill bit 4 can be adjusted according to the needs of working, then water is injected into the connecting pipe 5 at the moment, the water flows into the diversion water tank 9, and then passes through the first water outlet hole 10, the second water outlet hole 11 and the third water outlet hole 12 respectively, the water inside the diversion water tank 9 is sprayed out, so that the drill bit 4 can fall dust during drilling, thereby realizing convenient and fast adjustment of the length of the drill bit 4, meanwhile, the dust falling effect can be achieved during drilling, and then the drilling effect of the drill bit 4 is ensured, meanwhile, the life safety of workers is guaranteed, and the working efficiency and the practicability of the drill bit 4 are improved.
In other embodiments, the embodiment discloses the installation position of the cooling and protection mechanism, as shown in fig. 2 and 3, fixed blocks 13 are fixed on the two side surfaces of the screw rod 7 in the cavity of the installation base 1, and fan blades 14 are fixed on the surface of one side of the fixed block 13; the bottom end of the mounting seat 1 is provided with symmetrical radiating ports 15, and a dustproof filter screen 16 is fixed inside the radiating ports 15 through bolts;
when just reversing motor 6 and cooling, the protection, at first just reversing motor 6 is at the during operation, lead screw 7 can follow and rotate, then drive and install flabellum 14 in fixed block 13 one side and rotate, make the wind-force that flabellum 14 produced when rotating can cool down to this state under just reversing motor 6, realized then can cooling down to operating condition under just reversing motor 6, provide safe operational environment for just reversing motor 6, guaranteed then just reversing motor 6's normal work operation.
In other embodiments, the present embodiment discloses the opening positions of the holes, as shown in fig. 2, the surface of the fan blade 14 is provided with holes distributed at equal intervals, and the fan blade 14 is made of resin;
the cavities distributed at equal intervals are formed in the surface of the fan blade 14, so that the resistance of the fan blade 14 during rotation can be reduced, and the rotation frequency of the fan blade 14 is improved.
In other embodiments, the embodiment discloses the installation positions of the water pump and the water tank, as shown in fig. 1, the water pump is fixed at the tail end of the connecting pipe 5, and the output shaft of the water pump is connected with the water tank through a water pipe;
the water pump is connected at the tail end of the connecting pipe 5, and then the water outlet pipe of the water tank is connected on the output shaft of the water pump, so that the dust removal function can be performed on the drill bit 4 in the working state, and the physical and psychological health of workers can be protected,
in other embodiments, the present embodiment discloses the opening positions of the filter holes, as shown in fig. 3, the surface of the dustproof filter screen 16 is provided with uniformly distributed filter holes, and the dustproof filter screen 16 is made of stainless steel;
through the internally mounted dustproof filter screen 16 at thermovent 15, then the evenly distributed's that 16 surfaces of rethread dustproof filter screen were seted up filtration pore, the dust that produces when can effectively preventing to drill enters into mount pad 1 through thermovent 15 in, has guaranteed the normal work operation of just reversing motor 6 then, has also prolonged the life of just reversing motor 6.
In other embodiments, the embodiment discloses the installation position of the seal ring, as shown in fig. 1, the seal ring is sleeved on the outer surface of the installation seat 1, and the surface of the seal ring is provided with anti-slip threads;
through cup jointing the sealing washer at the surface of mount pad 1 for mount pad 1 is more firm when with mechanical installation, has guaranteed the drilling quality of drill bit 4 when drilling then.
In other embodiments, the present embodiment discloses the installation position of the bumper strip, as shown in fig. 1, the bumper strip is arranged on the fixing sleeve 2, and the bumper strip is distributed in an S shape at equal intervals;
through the anticollision strip that is "S" shape equidistance and distributes at fixed sleeve 2 'S surface mounting, can reduce the wearing and tearing that external factor produced fixed sleeve 2, prolonged fixed sleeve 2' S life then.
In other embodiments, the embodiment discloses the installation position of the anti-slip cover, as shown in fig. 2, a protective cover is sleeved on the outer surface of the connecting pipe 5, and the protective cover is made of elastic rubber;
cup joint the antiskid cover through the surface at connecting pipe 5, can carry out effectual protection to the outer wall of connecting pipe 5, reduced the direct destruction of external environment to connecting pipe 5, then can prolong the life of connecting pipe 5.
In other embodiments, the embodiment discloses an opening position of the cavity and a mounting position of the bearing block, as shown in fig. 1, the interior of the drill 4 is provided with the cavity, and the bearing block is fixed in the cavity;
offer the cavity through the inside at drill bit 4, then at the internally mounted bearing block of cavity, can increase drill bit 4's dead weight, improve the intensity of polishing of drill bit 4 when drilling, improved drill bit 4's drilling efficiency then.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A whirl well drilling bit, includes mount pad (1), its characterized in that: a fixed sleeve (2) is fixed at the bottom end of the mounting seat (1), a connecting sleeve (3) movably penetrates through the inner side of the fixed sleeve (2), the connecting sleeve (3) extends to the outer wall of the bottom end of the fixed sleeve (2), and a drill bit (4) is fixed at the tail end of the connecting sleeve; a cavity is formed in the mounting seat (1), a forward and reverse rotating motor (6) is fixed in the cavity, an output shaft of the forward and reverse rotating motor (6) is rotatably connected with a lead screw (7), the lead screw (7) rotatably penetrates through the outer wall of the top end of the fixed sleeve (2), one side, far away from the forward and reverse rotating motor (6), of the lead screw (7) extends into the connecting sleeve (3), a ball nut (8) is rotatably sleeved on the outer wall of the lead screw, and the ball nut (8) is fixed on the inner side of the connecting sleeve (3); a flow guide water tank (9) is formed in the screw rod (7), a connecting pipe (5) penetrates through the outer wall of the bottom end of the mounting seat (1), and one side, far away from the mounting seat (1), of the connecting pipe (5) extends into the flow guide water tank (9); the two side surfaces of the screw rod (7) are respectively provided with a first water outlet (10) corresponding to the water diversion tank (9), the two side surfaces of the connecting sleeve (3) are respectively provided with a second water outlet (11) corresponding to the first water outlet (10), and the two side surfaces of the fixed sleeve (2) are respectively provided with a third water outlet (12) corresponding to the second water outlet (11);
fixing blocks (13) are fixed on the surfaces of the two sides of the screw rod (7) in the cavity of the mounting seat (1), and fan blades (14) are fixed on the surface of one side of each fixing block (13); symmetrical radiating openings (15) are formed in the bottom end of the mounting seat (1), and a dustproof filter screen (16) is fixed inside the radiating openings (15) through bolts.
2. The bit according to claim 1, wherein: the surface of flabellum (14) is seted up the hole of equidistance distribution, flabellum (14) are the resin material.
3. A rotary flow drill bit according to claim 1, wherein: the tail end of the connecting pipe (5) is fixedly provided with a water pump, and the water pump is connected with a water tank through a water pipe.
4. A rotary flow drill bit according to claim 1, wherein: evenly distributed's filtration pore is seted up on the surface of dustproof filter screen (16), dustproof filter screen (16) are stainless steel.
5. A rotary flow drill bit according to claim 1, wherein: the outer surface of the mounting seat (1) is sleeved with a sealing ring, and the surface of the sealing ring is provided with anti-skid grains.
6. A rotary flow drill bit according to claim 1, wherein: the fixed sleeve (2) is provided with anti-collision strips, and the anti-collision strips are distributed in an S-shaped equidistant mode.
7. A rotary flow drill bit according to claim 1, wherein: the outer surface of the connecting pipe (5) is sleeved with a protective sleeve, and the protective sleeve is made of elastic rubber.
8. A rotary flow drill bit according to claim 1, wherein: a cavity is formed in the drill bit (4), and a bearing block is fixed in the cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010854421.6A CN111946268B (en) | 2020-08-24 | 2020-08-24 | Rotational flow drilling bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010854421.6A CN111946268B (en) | 2020-08-24 | 2020-08-24 | Rotational flow drilling bit |
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| Publication Number | Publication Date |
|---|---|
| CN111946268A CN111946268A (en) | 2020-11-17 |
| CN111946268B true CN111946268B (en) | 2022-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010854421.6A Active CN111946268B (en) | 2020-08-24 | 2020-08-24 | Rotational flow drilling bit |
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| CN (1) | CN111946268B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114607295B (en) * | 2022-03-18 | 2024-05-24 | 陈中新 | Energy survey system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2779665B2 (en) * | 1989-10-19 | 1998-07-23 | 東急建設株式会社 | Drilling equipment |
| JP3184034U (en) * | 2013-01-15 | 2013-06-13 | 稔 富澤 | Container with excavation bit for burying high-level radioactive waste under the deep sea |
| CN208267757U (en) * | 2018-06-06 | 2018-12-21 | 湖北鑫民建筑工程有限公司 | A kind of efficient pile driving equipment of road construction |
| CN208734297U (en) * | 2018-07-17 | 2019-04-12 | 安徽省皖北煤电集团有限责任公司 | A kind of rock breakes device |
| CN208934592U (en) * | 2018-10-08 | 2019-06-04 | 河北鑫拓工程勘察设计有限公司 | A kind of crawler-type engineering drilling machine |
| CN211038564U (en) * | 2019-09-27 | 2020-07-17 | 联顺辉（天津）油田技术服务有限公司 | Safe and reliable's drill bit fishing device |
| CN211258498U (en) * | 2019-10-31 | 2020-08-14 | 盈科(天津)科技有限公司 | Novel drilling equipment for oil development |
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