CN113107366B - Pulse jet probe for high-pressure force application rock breaking - Google Patents
Pulse jet probe for high-pressure force application rock breaking Download PDFInfo
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- CN113107366B CN113107366B CN202110466801.7A CN202110466801A CN113107366B CN 113107366 B CN113107366 B CN 113107366B CN 202110466801 A CN202110466801 A CN 202110466801A CN 113107366 B CN113107366 B CN 113107366B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
Abstract
The invention relates to a pulse jet probe for breaking rock by high pressure force application, which comprises: a pipeline; the speed increasing mechanism comprises at least one group of turbine mechanisms, a connector and a one-way valve, one end of each turbine mechanism is rotatably connected with the pipeline, the other end of each turbine mechanism is fixedly connected with the one-way valve through the connector, and the one-way valve is used for one-way circulation of drilling fluid; the pressurizing mechanism comprises a piston sleeve, an injector head, a piston, a spring and a spring fixer, wherein a first liquid flow channel is formed on the side wall of the piston sleeve, a pressurizing cavity is formed in the injector head, a second liquid flow channel is formed on the side wall of the injector head, the piston sleeve rotates for a circle, and the first liquid flow channel and the second liquid flow channel are aligned and communicated once; the piston, the spring and the spring fixer are used for suppressing pressure to form high-pressure jet flow, the jet probe can improve the utilization rate of drilling water power, the drilling efficiency is improved, and the rock breaking cost is reduced.
Description
Technical Field
The invention relates to the technical field of drilling equipment, in particular to a pulse jet probe for breaking rock by applying force at high pressure.
Background
In recent years, with the development of domestic oil and gas exploration and development towards deep strata, the number of deep well ultra-deep wells is gradually increased, the problems of low drilling speed, high cost and long period of deep wells are remarkably solved, and the development of deep oil fields is seriously hindered. Numerous studies at home and abroad show that in the deep well drilling process, the increase of confining pressure applied by a drilling fluid column in a shaft is one of the main reasons for reducing the conventional rotary drilling speed. In addition, along with the increase of the well depth, the hydraulic loss along the way is increased, the available water horsepower of a drill bit at the bottom of the well is sharply reduced under the condition that the power of a ground pump is not changed, the hydraulic rock breaking and cleaning capacity is weakened, repeated cutting and crushing are caused by the fact that rock debris cannot be cleaned in time under many conditions, even a drill bit mud bag generates a pressure holding effect, and all the factors are important reasons for reducing the drilling speed. Therefore, the problem that the drilling engineering world at home and abroad tries to explore and solve all the time is to improve the utilization efficiency of the hydraulic energy at the well bottom as much as possible and further improve the drilling speed of the drilling machine.
The method for breaking rock by explosive has high efficiency and flexible application, and can be widely applied to mining, water conservancy, geotechnical engineering and other engineering. However, this method can also be used to blast rock and adversely affect the surrounding environment, and pose a potential threat to personnel and equipment safety. The destruction of blasting earthquake and blasting shock wave, the pollution of toxic gas and blasting noise and the accidents of explosive storage, transportation and priming are happened. A series of safety measures such as shock prevention, noise prevention, ventilation and smoke exhaust consume a large amount of manpower, material resources and financial resources. Aiming at the defects of blasting and breaking rock, the non-blasting rock breaking technology developed at home and abroad in nearly two to thirty years has received wide attention of people. Foreign tests have shown that in some engineering fields the technique can be used partly or wholly in place of explosives for breaking rock. With the development and improvement of the non-explosive rock breaking technology, the deep change of the engineering fields needing rock breaking, such as mining engineering, roadway driving and the like, is certainly brought. Currently, non-explosive rock breaking techniques have spawned a branch of technologies that utilize multiple rock breaking mechanisms. The following aspects are mainly provided: the method comprises a flame cutting rock breaking technology, an electric energy thermal rock breaking technology, a splitter rock breaking technology, a high-pressure water jet rock breaking technology and the like. These techniques have found widespread use in some areas. However, it has not been widely used in major rock breaking operations in mining engineering and roadway driving. Mainly due to low production capacity, high technical requirements, high equipment and operation costs, and the like.
In view of the above, a high-pressure water pulse rock breaking technology developed on the basis of high-pressure water jet is produced. The technology is that the instantaneous high-pressure jet flow generated by the high-pressure hydraulic pulse generator is sprayed into a pre-drilled drill hole, and the instantaneous high-pressure released by the pulse jet flow is utilized to break rock, so that the rock breaking capacity is greatly improved.
Disclosure of Invention
In view of this, it is necessary to provide a pulse jet probe for breaking rock under high pressure, so as to solve the problems of high technical requirements and high cost of existing rock breaking and low utilization rate of hydraulic energy at the bottom of a well in the existing drilling process.
The technical scheme of the invention provides a pulse jet probe for breaking rock by high-pressure force application, which comprises:
a pipeline;
the speed increasing mechanism comprises a speed increasing device, a connector and a one-way valve, one end of the speed increasing device is rotatably connected with the pipeline, the other end of the speed increasing device is fixedly connected with the one-way valve through the connector, and the one-way valve is used for one-way circulation of drilling fluid;
the pressurizing mechanism comprises a piston sleeve, an injector head, a piston, a spring and a spring fixer, wherein a first liquid flow channel is formed on the side wall of the piston sleeve, and one end of the piston sleeve is fixedly connected with the one-way valve;
a pressurizing cavity is formed in the injection head and penetrates through the bottom of the injection head, a second liquid flow channel is formed in the side wall of the injection head and penetrates through the outer wall of the injection head, the piston sleeve rotates for a circle, the first liquid flow channel and the second liquid flow channel are aligned and communicated once, an annular groove is formed in the pressurizing cavity, a bearing is fixed in the groove, and the injection head is rotatably connected with the one-way valve through the bearing;
a trigger cavity is formed in the piston, the trigger cavity is opposite to and communicated with the pressurizing cavity, and the piston is positioned at the opening position at the bottom of the pressurizing cavity and is in sliding type sealing connection with the pressurizing cavity;
one end of the spring is fixed at the bottom of the inner side of the pressurizing cavity, the piston is sleeved in the spring, the top of the piston is fixedly connected with the other end of the spring, and the piston drives the spring to stretch when sliding.
Furthermore, the speed increaser comprises a turbine and a first sleeve which is sleeved outside the turbine and is fixedly connected with the turbine, one end of the first sleeve is rotatably connected with the pipeline, and the other end of the first sleeve is fixedly connected with the one-way valve through a connector.
Further, the connector includes that spline and cover establish outside the spline and with the spline carries out the second sleeve of key-type connection, the mid portion of spline is divided into a plurality of passageways through a plurality of baffles etc. equally, the intermediate position of spline outwards extends has the connecting axle, the connecting axle with check valve fixed connection.
Furthermore, the check valve includes a valve core, a front valve sleeve and a rear valve sleeve, one end of the rear valve sleeve is fixedly connected with the second sleeve, the other end of the rear valve sleeve is fixedly connected with the piston sleeve, the outer side wall of the front valve sleeve is fixedly connected with the inner ring of the bearing, the outer side wall of the front valve sleeve is rotatably connected with the injector head through the bearing, and the valve core is sleeved in the front valve sleeve and is fixedly connected with the connecting shaft.
Further, a plurality of first fluid passages are formed in the side wall of the piston sleeve in an array along the circumferential direction.
Further, a plurality of second liquid flow passages are formed in the side wall of the ejection head in an array along the circumferential direction, the number of the second liquid flow passages being the same as the number of the first liquid flow passages.
Further, still include the spring fixer, the spring fixer cover is established in the spring, the piston cover is established in the spring fixer, annular recess has been seted up to the lateral wall of piston, the inner wall of piston fixer be equipped with recess complex arch.
Further, a check cavity is formed in the injection head, a bulge is formed in the check cavity, and the bulge is used for preventing liquid from flowing back.
Furthermore, the inner wall surface and the outer wall surface of the pipeline are both provided with oil surface materials.
Further, the pipeline includes that interference fit cup joints inner tube, intermediate layer pipe and outer tube in proper order, the inner wall of inner tube with the wall of the outer wall of outer tube all coats and is equipped with the oil level material, the intermediate layer pipe is for adopting the memory alloy material to make.
Compared with the prior art, the pulse jet probe for high-pressure force application rock breaking provided by the invention can achieve the following technical effects:
in the invention, fluid flows into a trigger cavity in the piston, the trigger cavity drives the spring fixer, and the spring fixer presses the spring to suppress pressure; simultaneously in the fluid process in the first flow channel, because the piston bush can follow the rotation under the rotation effect of turbine, consequently first flow channel can follow and rotate, at first flow channel pivoted in-process, the piston bush rotates a week, first flow channel with the second flow channel aligns once, works as first flow channel just in time rotate for when the second flow channel aligns, the energy of spring compression suppress the pressure will release and carry out the efflux, and the high-pressure high-speed fluid in the booster cavity jets out after the runner rapidly to carry out the fracturing to reservoir rock, reach the mesh that hydraulic power brokenly the rock. Compared with the existing rock breaking mode, the pulse jet probe for breaking rock by high pressure water power provided by the invention can improve the utilization rate of water power energy, reduce the drilling cost and improve the drilling efficiency.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a pulse jet probe for high-pressure hydraulic rock breaking according to the present invention;
FIG. 2 is an exploded view of FIG. 1;
FIG. 3 is a cross-sectional view of FIG. 1;
FIG. 4 is a structural schematic view of the turbine of FIG. 1;
FIG. 5 is a schematic structural view of the spline of FIG. 1;
FIG. 6 is a schematic structural view of the showerhead of FIG. 1;
FIG. 7 is a schematic illustration of the piston sleeve of FIG. 1;
description of the reference numerals:
1. pipeline, 2, speed increasing mechanism, 3, pressurizing mechanism, 11, inner pipe, 12-middle layer pipe, 13, appearance, 21, first sleeve, 22, turbine, 23, second sleeve, 24, spline, 25, rear valve sleeve, 26, valve core, 27, front valve sleeve, 31, bearing, 32, piston sleeve, 33, injection head, 34, spring holder, 35, spring, 36, piston, 321, first liquid flow pipeline, 331, second liquid flow pipeline, 332, check cavity, 333, pressurizing cavity, 361 and departure cavity.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
As shown in fig. 1 to 3, an embodiment of the present invention provides a pulse jet probe for high-pressure hydraulic rock breaking, which includes a pipeline 1, a speed increasing mechanism 2 and a pressure increasing mechanism 3. The speed increasing mechanism 2 comprises at least one group of turbine mechanism, a connector and a one-way valve, wherein one end of the turbine mechanism is connected with the pipeline 1 in a rotating mode, the other end of the turbine mechanism is connected with the one-way valve through the connector in a fixed mode, and the one-way valve is used for one-way circulation of drilling fluid.
Referring to fig. 2 and 4, the turbine mechanism includes a turbine 22 and a first sleeve 21 sleeved outside the turbine 22 and fixedly connected to the turbine 22, one end of the first sleeve 21 is rotatably connected to the pipeline 1, and the other end of the first sleeve 21 is fixedly connected to the check valve through a connector.
As shown in fig. 5, the connector includes a spline 24 and a second sleeve 23 that is sleeved outside the spline 24 and is connected with the spline 24 in a key manner, the middle portion of the spline 24 is equally divided into a plurality of channels by a plurality of partition plates 241, a connecting shaft 242 extends outwards from the middle portion of the spline 24, and the connecting shaft 242 is fixedly connected with the one-way valve.
As shown in fig. 2 and 3, the check valve includes a valve core 26, a front valve sleeve 27 and a rear valve sleeve 25, one end of the rear valve sleeve 25 is fixedly connected to the second sleeve 23, the other end of the rear valve sleeve is fixedly connected to the piston sleeve 32, an outer side wall of the front valve sleeve 27 is fixedly connected to an inner ring of the bearing 27 and rotatably connected to the injector head 31 through the bearing 27, and the valve core 26 is sleeved in the front valve sleeve 27 and fixedly connected to the connecting shaft 242.
The working process of the speed increasing mechanism is as follows: firstly, a pulse jet probe generating tool is put into a well section of rock to be crushed along a drill rod, then drilling fluid is injected into a pipeline 1, the drilling fluid firstly flows through a turbine 22 along the pipeline 1, the drilling fluid drives the turbine 22 to rotate, and the turbine 22 rotates to drive a one-way valve to rotate; at the same time, the fluid continues to flow and passes through the spline 24, the rear valve sleeve 25, the valve core 26 and the front valve sleeve 27 in sequence, and the fluid only flows in one direction into the following booster mechanism due to the one-way check function of the valve core 26 when passing through the front valve sleeve 27.
In the invention, the middle part of the spline 24 is equally divided into a plurality of channels through a plurality of partition plates 241, so that the flow equalization effect can be realized.
As shown in fig. 2 and 3, the pressurizing mechanism includes a piston sleeve 32, a spray head 33, a piston 26, a spring 35, and a spring holder 34, a first liquid flow passage 321 is formed on a side wall of the piston sleeve 32, and one end of the piston sleeve 32 is fixedly connected to the check valve.
As shown in fig. 3 and fig. 6, a pressurizing cavity 333 is formed in the injection head 33, the pressurizing cavity 33 penetrates through the bottom of the injection head 33, a second fluid channel 331 is formed on a side wall of the injection head 33, the second fluid channel 331 penetrates through an outer wall of the injection head 33, the piston sleeve 32 rotates for a circle, the first fluid channel 321 is aligned with the second fluid channel 331 and is communicated once, an annular groove is formed in the pressurizing cavity 333, a bearing 37 is fixed in the groove, and the injection head 33 is sleeved outside the front valve sleeve 27 and is rotatably connected with the front valve sleeve 27 through the bearing 31.
One end of the spring 35 is fixed at the bottom of the inner side of the pressurizing cavity 333, the spring fixer 34 is sleeved in the spring 35, the top of the spring is fixedly connected with the other end of the spring 35, the piston 36 is sleeved in the spring fixer 34 and is fixedly connected with the spring fixer 34, and the piston 36 is in sliding type sealing connection with the bottom of the pressurizing cavity 333.
An annular groove is formed in the outer side wall of the piston 36, a protrusion matched with the groove is arranged on the inner wall of the piston holder 34, a trigger cavity 361 is formed in the piston 36, and the trigger cavity 361 is opposite to and communicated with the pressurization cavity 333.
As shown in fig. 3, when the fluid enters the pressurizing cavity 333, the fluid then flows into the triggering cavity 361 in the piston 36, the triggering cavity 361 drives the spring holder 34, and the spring holder 34 presses the spring 35 to be pressurized; meanwhile, when fluid passes through the first fluid passage 321, the piston sleeve 32 rotates under the rotation action of the turbine 22, so that the first fluid passage 321 rotates, the piston sleeve 32 rotates for a circle in the rotation process of the first fluid passage 321, the first fluid passage 321 is aligned with the second fluid passage 331 once, when the first fluid passage 321 just rotates to align the second fluid passage 331, the energy of the compression and pressure holding of the spring 35 is released to perform jet flow, and high-pressure high-speed fluid in the pressurizing cavity 333 is rapidly ejected after passing through the flow passage, so that the reservoir rock is fractured, and the purpose of hydraulic rock breaking is achieved. Since the first flow path is periodically disconnected or connected to the second flow path 333, when connected, the flow is ejected to form a high pressure jet, and is therefore referred to as a pulsed jet.
In addition, the spring holder 34 and the spring 35 according to the present invention not only can perform a pressure-holding function but also can perform a pressure-stabilizing function by an expansion and contraction function when the fluid flows into the trigger chamber 361.
As shown in fig. 6 and fig. 7, it should be further explained that the first flow path 321 and the second flow path 331 are not limited to be provided as one, and may be provided as a plurality of paths. That is, the piston sleeve 32 has a plurality of first flow passages 321 formed in a circumferential direction in an array on a side wall thereof. The side wall of the ejecting head 33 is formed with a plurality of second liquid flow paths 331, the number of which is the same as that of the first liquid flow paths 321, in an array along the circumferential direction.
During the rotation of the piston sleeve 32, the first fluid passage 321 of the piston sleeve 32 is alternately connected to or disconnected from the second fluid passage 331 of the spray head 33, thereby forming a pulse jet.
Meanwhile, in order to prevent the liquid flow from flowing backward during the injection, a check cavity 332 is formed in the injection head 33, and a protrusion is formed in the check cavity 332 and used for preventing the liquid from flowing backward.
In the flowing process of the liquid flow, in order to reduce the reduction or loss caused by the momentum of the rough surface in the pipeline 1 to the fluid in the pipeline, the inner wall surface and the outer wall surface of the pipeline 1 are both provided with oil surface materials. The use of the oil surface material can reduce the friction between the pipeline and the fluid.
As another embodiment of the present invention, the pipeline 1 includes an inner pipe 13, an intermediate layer pipe 12 and an outer pipe 11 which are sequentially sleeved in an interference fit manner, wall surfaces of an inner wall of the inner pipe 13 and an outer wall of the outer pipe 11 are both coated with an oil surface material, and the intermediate layer pipe 12 is made of a memory alloy material. The oil surface material can reduce the friction force between the pipeline and the fluid, and meanwhile, the middle layer pipe is made of a memory alloy material, so that the temperature of two sides of the pipeline can be changed, the pipeline deflects, and the spray head sprays at an unclear part.
In summary, the present invention provides a pulse jet probe for high pressure hydraulic rock breaking, which stores energy provided by a pressure source for a certain period of time, then transfers the energy to a working medium for a very short period of time, and emits the working medium to obtain a pulse jet with a pressure much higher than that of a power source. Therefore, the pulse jet can more fully exert the water hammer effect, can effectively improve the peak impact force of the jet on the bottom of the well under the condition of the same energy level, and enables the jet energy acting on the unit area of the rock to be larger.
While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (7)
1. A pulse jet probe for high pressure force rock breaking comprising:
a pipeline;
the speed increasing mechanism comprises at least one group of turbine mechanisms, a connector and a one-way valve, one end of each turbine mechanism is rotatably connected with the pipeline, the other end of each turbine mechanism is fixedly connected with the one-way valve through the connector, and the one-way valve is used for one-way circulation of drilling fluid;
the pressurizing mechanism comprises a piston sleeve, an injector head, a piston and a spring, wherein a first liquid flow channel is formed on the side wall of the piston sleeve, and one end of the piston sleeve is fixedly connected with the one-way valve;
a pressurizing cavity is formed in the injector head and penetrates to the bottom of the injector head, a second liquid flow channel is formed in the side wall of the injector head and penetrates through the outer wall of the injector head, the piston sleeve rotates for a circle, the first liquid flow channel and the second liquid flow channel are aligned and communicated once, an annular groove is formed in the pressurizing cavity, a bearing is fixed in the groove, and the injector head is sleeved outside the one-way valve and is rotationally connected with the one-way valve through the bearing;
a trigger cavity is formed in the piston, the trigger cavity is opposite to and communicated with the pressurizing cavity, and the piston is positioned at the opening position at the bottom of the pressurizing cavity and is in sliding type sealing connection with the pressurizing cavity;
one end of the spring is fixed at the bottom of the inner side of the pressurizing cavity, the piston is sleeved in the spring, the top of the piston is fixedly connected with the other end of the spring, and the piston drives the spring to stretch when sliding;
the turbine mechanism comprises a turbine and a first sleeve which is sleeved outside the turbine and fixedly connected with the turbine, one end of the first sleeve is rotatably connected with the pipeline, and the other end of the first sleeve is fixedly connected with the one-way valve through a connector; the connector comprises a spline and a second sleeve which is sleeved outside the spline and is in key connection with the spline, the middle part of the spline is equally divided into a plurality of channels through a plurality of partition plates, a connecting shaft extends outwards from the middle part of the spline, and the connecting shaft is fixedly connected with the one-way valve; the check valve comprises a valve core, a front valve sleeve and a rear valve sleeve, one end of the rear valve sleeve is fixedly connected with the second sleeve, the other end of the rear valve sleeve is fixedly connected with the piston sleeve, the outer side wall of the front valve sleeve is fixedly connected with the inner ring of the bearing, the bearing is rotatably connected with the injector head, and the valve core is sleeved in the front valve sleeve and is fixedly connected with the connecting shaft.
2. The pulse jet probe for high pressure forced rock breaking of claim 1, wherein the piston sleeve has a plurality of first fluid flow channels formed in a circumferential array in a side wall thereof.
3. The pulse jet probe for high pressure forced rock breaking of claim 2, wherein a plurality of second flow channels are formed in the same number as the first flow channels in an array along the circumferential direction on the side wall of the jet head.
4. The pulse jet probe for high-pressure force application rock breaking of claim 3, further comprising a spring holder, wherein the spring holder is sleeved in the spring, the piston is sleeved in the spring holder, an annular groove is formed in the outer side wall of the piston, and a protrusion matched with the groove is formed in the inner wall of the piston holder.
5. The pulse jet probe for high pressure force rock breaking of claim 4, wherein a check cavity is further formed in the jet head, and a protrusion is formed in the check cavity to prevent backflow of liquid.
6. The pulse jet probe for high pressure forced rock breaking of claim 1, wherein both the inner and outer wall surfaces of the conduit are provided with an oil surface material.
7. The pulse jet probe for high-pressure force application rock breaking as claimed in claim 1, wherein the pipeline comprises an inner pipe, an intermediate layer pipe and an outer pipe which are sequentially sleeved in an interference fit manner, the inner wall of the inner pipe and the outer wall of the outer pipe are both coated with oil surface materials, and the intermediate layer pipe is made of memory alloy materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110466801.7A CN113107366B (en) | 2021-04-28 | 2021-04-28 | Pulse jet probe for high-pressure force application rock breaking |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110466801.7A CN113107366B (en) | 2021-04-28 | 2021-04-28 | Pulse jet probe for high-pressure force application rock breaking |
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| CN113107366A CN113107366A (en) | 2021-07-13 |
| CN113107366B true CN113107366B (en) | 2023-02-24 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101105115A (en) * | 2006-07-12 | 2008-01-16 | 中国石油大学(北京) | Waterpower pulse cavitation jet well drilling device, method and drill bit |
| CN102345441A (en) * | 2011-06-21 | 2012-02-08 | 中国石油大学(北京) | Self-propelled drilling method and pulsed cavitation swirling jet nozzle |
| CN102536121A (en) * | 2012-02-08 | 2012-07-04 | 中国石油大学(北京) | Pulse type underground pressurization jet flow drilling method and device |
| CN106223856A (en) * | 2016-08-31 | 2016-12-14 | 中国石油集团渤海钻探工程有限公司 | Spring valve type drilling fluid pulse generating means |
| CN106246106A (en) * | 2016-08-24 | 2016-12-21 | 中石化石油工程机械有限公司研究院 | A kind of pulsed hydraulic jet drilling tool |
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2021
- 2021-04-28 CN CN202110466801.7A patent/CN113107366B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101105115A (en) * | 2006-07-12 | 2008-01-16 | 中国石油大学(北京) | Waterpower pulse cavitation jet well drilling device, method and drill bit |
| CN102345441A (en) * | 2011-06-21 | 2012-02-08 | 中国石油大学(北京) | Self-propelled drilling method and pulsed cavitation swirling jet nozzle |
| CN102536121A (en) * | 2012-02-08 | 2012-07-04 | 中国石油大学(北京) | Pulse type underground pressurization jet flow drilling method and device |
| CN106246106A (en) * | 2016-08-24 | 2016-12-21 | 中石化石油工程机械有限公司研究院 | A kind of pulsed hydraulic jet drilling tool |
| CN106223856A (en) * | 2016-08-31 | 2016-12-14 | 中国石油集团渤海钻探工程有限公司 | Spring valve type drilling fluid pulse generating means |
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