CN112814636B - Low-frequency fracturing device - Google Patents
Low-frequency fracturing device Download PDFInfo
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- CN112814636B CN112814636B CN202011553658.7A CN202011553658A CN112814636B CN 112814636 B CN112814636 B CN 112814636B CN 202011553658 A CN202011553658 A CN 202011553658A CN 112814636 B CN112814636 B CN 112814636B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 53
- 230000007246 mechanism Effects 0.000 claims abstract description 43
- 239000012530 fluid Substances 0.000 claims abstract description 40
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 20
- 230000008569 process Effects 0.000 abstract description 17
- 238000007789 sealing Methods 0.000 description 7
- 230000001965 increasing effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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Abstract
The invention relates to a low-frequency fracturing device, comprising: the device comprises a hollow shell, a worm mechanism, a frequency modulation pressurization mechanism and a check valve, wherein the worm mechanism, the frequency modulation pressurization mechanism and the check valve are arranged in the shell; when the worm rotates, the transmission gear is driven to rotate, the transmission gear drives the frequency modulation gear to rotate, so that the upper cavity and the lower cavity are driven to rotate relative to the lower cavity, when the worm rotates to a preset position, the inner hole is communicated with the perforation, and high-pressure fluid in the shell is ejected out, so that fracturing is carried out on a reservoir stratum. According to the invention, the driving sleeve is used as the transmission assembly, so that the fluid is not easy to block in the flowing process in the shell, and the stability is high.
Description
Technical Field
The invention relates to the technical field of hydraulic fracturing in petroleum engineering, in particular to a low-frequency fracturing device.
Background
At present, along with the development of the petroleum industry, unconventional oil and gas resources with low permeability and ultra-low permeability gradually become the production mastery of oil and gas fields in various countries, and generally have commercial value after artificial fracturing transformation in order to realize the commercial development of the unconventional oil and gas resources. The hydraulic fracturing is an important measure for underground operation of reservoir transformation and well trial completion of an oil and gas reservoir, the structure of a rock is damaged by the energy of water, so that the aim of perforation is fulfilled, the fracturing mode is widely applied to low-permeability oil and gas reservoirs and shale gas reservoir transformation, and a good yield increasing effect is achieved.
The pulse generation tool is a device for converting water flow into high-pressure pulse water flow, the existing fracturing device mostly adopts a single vortex rod to drive frequency modulation, in the using process, the vortex rod can stop rotating due to blockage of sand in fracturing fluid, and the torsional force on the vortex rod can be increased rapidly, so that the stability of the tool is reduced, the service life is shortened, and the progress of engineering is seriously influenced.
Disclosure of Invention
Aiming at the technical problems that the existing fracturing tool is easy to block, the reliability of a pressurization mechanism is poor and the like, the invention provides a circumferential low-frequency fracturing device with a worm drive function, so that the blocking possibility of the fracturing tool in the using process is reduced.
The specific technical scheme for solving the technical problems is as follows: a low frequency fracturing apparatus comprising: the device comprises a hollow shell, a scroll mechanism, a frequency modulation pressurization mechanism and a check valve, wherein the scroll mechanism, the frequency modulation pressurization mechanism and the check valve are arranged in the shell; the casing comprises an upper casing and a lower casing detachably connected with the upper casing, a first fixing frame and a second fixing frame are respectively arranged at two ends of the upper casing, and a perforation is formed in the side wall of the lower casing; the worm mechanism comprises a worm and a transmission gear, two ends of the worm are respectively fixed on the first fixing frame and the second fixing frame, and the transmission gear and the worm are connected through a key at one end of the second fixing frame; the frequency modulation pressurization mechanism comprises a frequency modulation gear, an upper cavity and a lower cavity which are sequentially connected, an inner hole matched with the perforation is formed in the lower cavity, the upper cavity and the lower cavity are connected to form a hollow cavity, the hollow cavity is rotationally connected with the transmission gear through the frequency modulation gear, when the worm rotates, the transmission gear is driven to rotate, the transmission gear drives the frequency modulation gear to rotate, so that the hollow cavity is driven to rotate relative to the lower cavity, and when the hollow cavity rotates to a preset position, the inner hole is communicated with the perforation; the check valve is arranged in the hollow cavity to control the fluid to flow in a one-way mode along the direction from the upper shell to the lower shell.
Optionally, the frequency modulation pressurization mechanism further comprises a pulley arranged on the outer wall of the frequency modulation gear, and the frequency modulation gear is in sliding connection with the lower shell through the pulley.
Optionally, the frequency modulation gear is a round box-shaped structure, frequency modulation inner teeth are arranged on the circumferential inner wall of the round box-shaped structure, and the frequency modulation inner teeth are meshed with the transmission gear.
Optionally, the number of teeth of the frequency-modulated internal teeth is greater than the number of teeth of the transmission gear.
Optionally, the transmission gear is coaxially connected with the scroll.
Optionally, the number of the scroll mechanisms is multiple, and the scroll mechanisms are distributed along the circumference of the axis of the upper housing.
Optionally, the outer wall of the lower cavity is tightly attached to the inner wall of the lower shell.
Optionally, it is close to go up the cavity frequency modulation gear department is provided with one-way runner, the check valve includes last check valve and non return pillar, go up the check valve with one-way runner adaptation, non return pillar both ends respectively with go up the check valve with cavity connection down, work as it is close to go up the check valve pressure that the frequency modulation gear face received is less than or equal to go up the check valve and connect when the pressure that the non return pillar face received, go up the shutoff of check valve one-way runner.
Optionally, go up stop return valve and include non return piston and non return spring, non return piston's lateral wall with the inside wall of last cavity is closely laminated, non return piston passes through non return spring with the non return pillar is connected, still be provided with on the non return piston with the arch that one-way runner size matches, under initial condition, non return spring's restoring force acts on non return piston makes protruding with one-way runner joint.
Optionally, the scroll mechanism further includes a bearing, the bearing is disposed around the axis of the upper housing, an outer ring of the bearing is connected to the first fixing frame and the second fixing frame, and an inner ring of the bearing is fixed to the scroll.
Compared with the prior art, the invention has the beneficial effects that: by adopting the driving sleeve as a transmission assembly, fluid only passes through the vortex column and the check valve in the flowing process of the fluid in the shell, so that the blockage is not easy to occur in the using process, and the stability is good; meanwhile, the sealing mode of sliding sleeve type staggered sealing of the driven sleeve and the shell is adopted, so that the sealing reliability is good, and the pressurization effect is good; in addition, the multi-scroll structure increases the structural stability of the low-frequency fracturing device.
Drawings
FIG. 1 is a schematic perspective view of a low frequency fracturing apparatus in an embodiment of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view taken along section A-A of FIG. 1;
FIG. 3 is a schematic structural view of the housing of FIG. 1;
FIG. 4 is a schematic perspective view of the housing of FIG. 1 with the housing omitted;
fig. 5 is a schematic perspective view of the low-frequency fracturing device in fig. 4 without a scroll mechanism.
In the drawings, the reference numbers indicate the following list of parts:
the device comprises a shell 1, a scroll rod 2, a frequency modulation pressurization mechanism 3, a check valve 4, a check valve 11, an upper shell 111, a first fixing frame 112, a second fixing frame 112, a lower shell 12, a perforation 121, a scroll rod 21, a transmission gear 2, a frequency modulation gear 31, a frequency modulation internal tooth 311, a pulley 32, an upper cavity 33, a lower cavity 34, an inner hole 341, an upper stop return valve 41, a one-way flow passage 411, a check piston 412, a check spring 413 and a check support 42.
Detailed Description
The principles and features of this invention are described below in conjunction with specific embodiments, the examples given are intended to illustrate the invention and are not intended to limit the scope of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In the description of the present invention, it should be noted that terms such as "upper", "lower", "front", "rear", and the like in the embodiments indicate directional terms, and are used for simplifying the description of the positional relationship based on the drawings of the specification, and do not mean that the components, devices, and the like which are referred to must operate according to the specific orientation and the limited operation and method, configuration, and such directional terms do not constitute a limitation of the present invention.
With the continuous development of oil gas exploration and development processes, the proportion of low-permeability, shale, compact and other difficultly-exploited oil gas reservoirs in the exploration and development processes is larger and larger, and the oil gas reservoirs have the characteristics of low permeability and can reach the target productivity by high perforation pressure. Among the various fracturing methods used at present, hydraulic fracturing is the most common method, however, the conventional fracturing device mostly adopts a single vortex rod to drive frequency modulation, and in the using process, the single vortex rod is easy to stop rotating due to blockage of sand in fracturing fluid, and the torsional force on the vortex rod is increased rapidly, so that the use stability of the pulse generating tool is reduced.
In order to solve the problems, the invention provides a scroll rod driving circumferential low-frequency fracturing device, and a frequency modulation pressurization mechanism is arranged, and a sleeve formed by a driving hollow cavity is used as a transmission component, so that fluid (such as fracturing fluid) is not easy to block in the flowing process of the fluid in a pulse generation tool, and the use stability of the tool is improved.
Specifically, referring to fig. 1 to 5, the present invention provides a low frequency fracturing apparatus, comprising: the device comprises a hollow shell 1, a scroll mechanism 2, a frequency modulation pressurization mechanism 3 and a check valve 4 which are arranged in the shell 1; the casing 1 comprises an upper casing 11 and a lower casing 12 detachably connected with the upper casing 11, wherein a first fixing frame 111 and a second fixing frame 112 are respectively arranged at two ends of the upper casing 11, and a perforation 121 is formed in the side wall of the lower casing 12; the worm mechanism 2 comprises a worm 21 and a transmission gear 22, two ends of the worm 21 are respectively fixed on the first fixing frame 111 and the second fixing frame 112, and the transmission gear 22 is in key connection with one end of the worm 21 penetrating through the second fixing frame 112; the frequency modulation pressurization mechanism 3 comprises a frequency modulation gear 31, an upper cavity 33 and a lower cavity 34 which are sequentially connected, wherein an inner hole 341 matched with the perforation 121 is formed in the lower cavity 34, the upper cavity 33 and the lower cavity 34 are connected to form a hollow cavity, the hollow cavity is rotatably connected with a transmission gear 22 through the frequency modulation gear 31, when the scroll bar 21 rotates, the transmission gear 22 is driven to rotate, the transmission gear 22 drives the frequency modulation gear 31 to rotate, so that the hollow cavity is driven to rotate relative to the lower shell 12, and when the middle cavity rotates to a preset position, the inner hole 341 is communicated with the perforation 121; a check valve 4 is disposed within the hollow cavity to control the one-way flow of fluid in the direction from the upper housing 11 to the lower housing 12.
It can be seen that in the invention, the frequency modulation gear 31 is innovatively adopted as a transmission component, the sliding sleeve type staggered sealing mode of the upper cavity 33, the lower cavity 34 and the lower cavity 12 is utilized, and the check valve 4 is arranged in a matched manner to control the unidirectional flow of fluid, so that the fluid can flow out of the lower cavity 12 only through the scroll rod 21 and the check valve 4 which are not easy to block in the flow in the cavity 1, the blocking risk in the use of the low-frequency fracturing device is greatly reduced, and the working stability is improved.
Specifically, as shown in fig. 1-2, the upper housing 11 and the lower housing 12 are both hollow cylindrical structures with one open end, and the two housings can be assembled into the hollow housing 1 in various detachable manners such as clamping and fastening, and the formed internal cavity is cylindrical, so that the assembly and maintenance convenience of the low frequency fracturing device is improved by this connection manner. The upper end of the interior of the upper shell 11 is provided with a first fixing frame 111, the lower end of the interior is provided with a second fixing frame 112, and the first fixing frame 111 and the second fixing frame 112 have the same structure. The lower housing 12 has a perforation 121 formed in a sidewall thereof, and the fluid is ejected through the perforation 121 in a predetermined state.
Referring to fig. 3, the scroll mechanism 2 includes a scroll 21 and a transmission gear 22, an upper end of the scroll 21 is fixed to the first fixing frame 111, a lower end of the scroll 21 is fixed to the second fixing frame 112, and a key pin is provided at a lower end of the scroll 21 and matches with a shape of a central shaft hole of the transmission gear 22. The transmission gear 22 is disposed below the second fixing frame 112, that is, in the using process, the key pin of the scroll bar 21 passes through the second fixing frame 112 and is inserted into the central axial hole of the transmission gear 22, so as to fixedly connect the scroll bar 21 and the transmission gear 22, thereby ensuring that the scroll bar 21 is fixed in the upper housing 11 and can drive the transmission gear 22 to rotate.
The arrangement enables the scroll 21 and the transmission gear 22 to be coaxially connected, reduces the moment born by the scroll 21 in the use process of the low-frequency fracturing device, and can prolong the service life of the scroll 21 to a certain extent.
In addition, the number of the scroll mechanisms 2 may be plural, that is, a plurality of scrolls 21 and a plurality of transmission gears 22 may be provided, and the plurality of scroll mechanisms 2 are distributed along the circumference of the shaft center of the upper housing 11. In the embodiment of the present invention, preferably, the number of the scroll mechanisms 2 is three, three scrolls 21 are respectively and fixedly connected to the three-bar transmission gear 22, and the three scrolls 21 are distributed in the housing 1 around the axis of the upper housing 11, and the distances between two adjacent scrolls 21 are equal. Through setting up a plurality of scroll bar mechanisms 2, further reduced the moment that single scroll bar 21 bore, can effectively improve low frequency fracturing device's structural stability, increase of service life.
Of course, in order to improve the overall structural strength of the low frequency fracturing device, it is preferable that the scroll mechanism 2 further includes a bearing (not shown in the figure), the bearing is disposed around the axis of the upper housing 11, the outer ring of the bearing is connected to the first fixing frame 111 and the second fixing frame 112, and the inner ring of the bearing is fixed to the scroll 21.
Referring to fig. 3-5, the frequency modulation booster mechanism 3 is integrally disposed in the housing 1 and is in transmission connection with the worm mechanism 2, when the worm 21 rotates to drive the transmission gear 22 to rotate, the transmission gear 22 drives the frequency modulation booster mechanism 3 to rotate relative to the lower housing 12, and a regular pulse wave is formed along with the change of the pressure in the frequency modulation booster mechanism 3.
The frequency modulation pressurization mechanism 3 comprises a frequency modulation gear 31, an upper cavity 33 and a lower cavity 34 which are sequentially connected from top to bottom, the frequency modulation gear 31 is positioned in the upper shell 11 and is arranged below the second fixing frame 112, and the upper cavity 33 and the lower cavity 34 are positioned in the lower shell 12. The frequency modulation gear 31 is a round box-shaped structure with an opening facing the direction of the second fixing frame 112, the circumferential inner wall of the round box-shaped structure is provided with frequency modulation inner teeth 311, and the frequency modulation inner teeth 311 are meshed with the transmission gear 22. That is, in the installation completed state, the transmission gear 22 is located inside the circular box-shaped structure, the bottom end of the transmission gear 22 contacts the bottom surface of the frequency modulation gear 31, the upper end surface of the frequency modulation gear 31 contacts the second fixing frame 112, and the transmission gear 22 rotates to drive the frequency modulation gear 31 to rotate.
As shown in fig. 4, the top end of the upper cavity 33 is fixedly connected to the bottom end of the frequency modulation gear 31, the lower cavity 34 is detachably connected to the upper cavity 33, the upper cavity 33 and the lower cavity 34 are both hollow structures with one open end, an inner hole 341 with a shape matching the shape of the perforation 121 is formed in the sidewall of the lower cavity 34, and the two are assembled to form a hollow cavity for containing fluid, wherein the check valve 4 is located in the hollow cavity. By providing the upper and lower chambers 33, 34 in a detachable connection, the ease of assembly of the low frequency fracturing apparatus can be further improved.
It can be understood that the low-frequency fracturing device provided by the invention adopts a sliding sleeve type staggered sealing manner of the upper cavity 33, the lower cavity 34 and the lower shell 12, that is, the outer walls of the upper cavity 33 and the lower cavity 34 are tightly attached to the inner wall of the lower shell 12, and simultaneously, the upper cavity 33 and the lower cavity 34 can rotate relative to the lower shell 12. Therefore, when the worm 21 drives the transmission gear 22 to rotate, the transmission gear 22 drives the upper cavity 33 and the lower cavity 34 to rotate after passing through the frequency modulation gear 31, in the process that the lower cavity 34 rotates, when the lower cavity 34 rotates to a preset position, the inner hole 341 on the lower cavity 34 is communicated with the perforation 121 on the lower shell 12, and high-pressure fluid in the lower cavity 34 is ejected after passing through the inner hole 341 and the perforation 121, so that the reservoir stratum is fractured.
Further, in order to improve the pressure accumulation time of the fluid in the hollow cavity, the number of teeth of the frequency modulation internal teeth 311 is greater than that of the transmission gear 22, in the embodiment of the present invention, preferably, the number of teeth of the frequency modulation gear 31 is three times that of the transmission gear 22, so that by setting the configuration of the number of teeth, the number of revolutions of the upper cavity 33 relative to the transmission gear 22 can be controlled, thereby controlling the pressure accumulation time of the fluid in the upper cavity 33 and the lower cavity 34, improving the impact force of the ejected fluid, and enhancing the use effect of the low-frequency fracturing device.
In addition, the fm booster mechanism 3 further includes a pulley 32 disposed on an outer wall of the fm gear 31, and the fm gear 31 is slidably connected to the upper housing 11 through the pulley 32. Specifically, the pulley 32 is protrudingly provided on the outer wall of the frequency adjustment gear 31 and is rotatable relative to the frequency adjustment gear 31 while the pulley 32 is closely attached to the inner wall of the upper housing 11. In the process that the rotating gear drives the frequency modulation gear 31 to rotate, the frequency modulation gear 31 can rotate with the upper shell 11 through the pulley 32, so that the sliding smoothness between the leveling gear and the upper shell 11 is improved; meanwhile, as the pulley 32 is arranged between the frequency modulation gear 31 and the upper shell 11, namely, a certain gap is formed between the frequency modulation gear 31 and the inner wall of the upper shell 11, fluid can enter the upper cavity 33 through the gap, so that the fluid can enter the lower cavity 34 only through the scroll 21 and the check valve 4 in the flowing process of the fluid. The construction of the pulley 32 is conventional in the art and will not be described in detail herein.
The check valve 4 is disposed in the cavity of the upper cavity 33 for preventing the high-pressure fluid from flowing back, i.e. preventing the fluid in the hollow cavity from flowing back into the upper housing 11, so that the fluid with silt blocks the scroll mechanism 2. To achieve this function, as shown in fig. 2 to 5, specifically, a one-way flow passage 411 is disposed at a top end of the upper cavity 33 near the frequency modulation gear 31, fluid can enter the upper cavity 33 only through the one-way flow passage 411, the check valve 4 includes an upper check valve 41 and a check support 42, the upper check valve 41 is adapted to the one-way flow passage 411, two ends of the check support 42 are respectively connected to the upper check valve 41 and the lower cavity 34, and when a pressure applied to a surface of the upper check valve 41 near the frequency modulation gear 31 is less than or equal to a pressure applied to a surface of the upper check valve 41 connected to the check support 42, that is, when a pressure applied to the upper housing 11 is less than or equal to a pressure applied to the upper cavity 33, the upper check valve 41 blocks the one-way flow passage 411.
Therefore, by arranging the one-way flow passage 411 and the upper check valve 41, the upper check valve 41 is separated from the one-way flow passage 411 only when the pressure applied to the upper check valve 41 is greater than the pressure applied to the upper cavity 33, and the fluid can enter the upper cavity 33 through the one-way flow passage 411, so that the fluid in the upper cavity 33 can not flow backwards.
The upper check valve 41 may be an elastic baffle or a stopper having a telescopic function, as long as it can block the one-way flow passage 411 when the pressure applied to the upper surface of the upper check valve 41 is less than or equal to the pressure applied to the upper surface.
In the embodiment of the present invention, it is preferable that: the upper check valve 41 comprises a check piston 412 and a check spring 413, the outer side wall of the check piston 412 is tightly attached to the inner side wall of the upper cavity 33, the check piston 412 is connected with the check support column 42 through the check spring 413, a bulge matched with the size of the one-way flow passage 411 is further arranged on the check piston 412, and in an initial state, the restoring force of the check spring 413 acts on the check piston 412 to enable the bulge to be clamped with the one-way flow passage 411, namely the check piston 412 blocks the one-way flow passage 411 through the bulge arranged on the surface.
For better understanding of the present invention, the operation of the low frequency fracturing apparatus provided by the present invention is described in detail below with reference to fig. 1-5: firstly, a low-frequency fracturing device is lowered into a well section to be fractured along a drill rod, then high-pressure fracturing fluid is injected into the shell 1 from the upper end of the upper shell 11, the fracturing fluid firstly enters the upper shell 11, then enters the upper cavity 33 and the lower cavity 34 after passing through the scroll 21, when the fracturing fluid flows into the surface of the upper cavity 33, pressure acting on the check piston 412 is generated, so that the check spring 413 is contracted, the check piston 412 is separated from the one-way flow passage 411, the fracturing fluid enters the lower end of the upper cavity 33 through the one-way flow passage 411, and when the pressure of the check piston 412 is balanced up and down, under the action of restoring force of the check spring 413, the check piston 412 blocks the one-way flow passage 411 again. It can be seen that, under the action of the check valve 4, the fracturing fluid can only enter the upper chamber 33 and the lower chamber 34 and can not flow backwards, and the pressure of the fracturing fluid in the upper chamber 33 and the lower chamber 34 can be gradually increased. Meanwhile, when the fracturing fluid passes through the scroll 21, the fracturing fluid can drive the scroll 21 to rotate, the scroll 21 drives the transmission gear 22 to rotate, the transmission gear 22 drives the upper cavity 33 and the lower cavity 34 to rotate after passing through the frequency modulation gear 31, and in the rotating process of the lower cavity 34, when the inner hole 341 is communicated with the perforation 121, the high-pressure fracturing fluid accumulated in the lower cavity 34 is ejected after passing through the inner hole 341 and the perforation 121, so that the reservoir is fractured.
In conclusion, the frequency modulation gear 31 is used as the transmission component, and fluid only passes through the scroll rod 21 and the check valve 4 which are not easy to block in the flowing process of the fluid in the shell 1, so that the device is not easy to block in the using process and has good stability; meanwhile, the sliding sleeve type staggered sealing mode of the lower cavity 34, the upper cavity 33 and the lower shell 12 is adopted, so that the sealing reliability is good, and the pressurization effect is good; in addition, the invention adopts a mode of increasing the number of the scroll bars 21, thereby improving the stability of the structure; and the transmission gear 22 and the worm 21 are coaxially fixed, so that the moment borne by the worm 21 is reduced, and the low-frequency fracturing device provided by the invention has longer service life.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A low frequency fracturing device, comprising: the device comprises a hollow shell (1), a scroll mechanism (2), a frequency modulation pressurization mechanism (3) and a check valve (4) which are arranged in the shell (1);
the casing (1) comprises an upper casing (11) and a lower casing (12) detachably connected with the upper casing (11), an internal cavity formed by assembling the upper casing (11) and the lower casing (12) is cylindrical, a first fixing frame (111) and a second fixing frame (112) are respectively arranged at two ends of the upper casing (11), and a perforation hole (121) is formed in the side wall of the lower casing (12);
the worm mechanism (2) comprises a worm (21) and a transmission gear (22), two ends of the worm (21) are respectively fixed on the first fixing frame (111) and the second fixing frame (112), and the transmission gear (22) is in key connection with one end of the worm (21) penetrating through the second fixing frame (112);
the frequency modulation supercharging mechanism (3) comprises a frequency modulation gear (31), an upper cavity (33) and a lower cavity (34) which are sequentially connected, wherein an inner hole (341) matched with the perforation hole (121) is formed in the lower cavity (34), the upper cavity (33) and the lower cavity (34) are connected to form a hollow cavity, the hollow cavity is rotatably connected with the transmission gear (22) through the frequency modulation gear (31), the frequency modulation gear (31) is of a round box-shaped structure, frequency modulation inner teeth (311) are arranged on the circumferential inner wall of the round box-shaped structure, the frequency modulation inner teeth (311) are meshed with the transmission gear (22), and the number of teeth of the frequency modulation inner teeth (311) is greater than that of the transmission gear (22); when the worm rod (21) rotates, the transmission gear (22) is driven to rotate, the transmission gear (22) drives the frequency modulation gear (31) to rotate, so that the hollow cavity is driven to rotate relative to the lower shell (12), and when the hollow cavity rotates to a preset position, the inner hole (341) is communicated with the perforation (121);
the check valve (4) is arranged in the hollow cavity to control the unidirectional flow of fluid along the direction from the upper shell (11) to the lower shell (12).
2. The low frequency fracturing device of claim 1, wherein the fm booster mechanism (3) further comprises a pulley (32) disposed on an outer wall of the fm gear (31), the fm gear (31) being slidably connected to the lower housing (12) through the pulley (32).
3. The low frequency fracturing device of claim 1, wherein the transmission gear (22) is coaxially connected to the scroll (21).
4. The low frequency fracturing device according to claim 3, wherein the number of the scroll mechanisms (2) is plural, and the plural scroll mechanisms (2) are circumferentially distributed along the axial center of the upper casing (11).
5. The low frequency fracturing device of claim 1, wherein the outer wall of the lower cavity (34) is in close contact with the inner wall of the lower housing (12).
6. The low-frequency fracturing device according to claim 1, wherein a one-way flow channel (411) is arranged in the upper cavity (33) close to the frequency modulation gear (31), the check valve (4) comprises an upper check valve (41) and a check support (42), the upper check valve (41) is matched with the one-way flow channel (411), two ends of the check support (42) are respectively connected with the upper check valve (41) and the lower cavity (34), and when the pressure applied to the surface of the upper check valve (41) close to the frequency modulation gear (31) is smaller than or equal to the pressure applied to the surface of the upper check valve (41) connected with the check support (42), the upper check valve (41) blocks the one-way flow channel (411).
7. The low-frequency fracturing device according to claim 6, wherein the upper check valve (41) comprises a check piston (412) and a check spring (413), the outer side wall of the check piston (412) is tightly attached to the inner side wall of the upper cavity (33), the check piston (412) is connected with the check support (42) through the check spring (413), a protrusion matched with the one-way flow passage (411) in size is further arranged on the check piston (412), and in an initial state, the restoring force of the check spring (413) acts on the check piston (412) so that the protrusion is clamped with the one-way flow passage (411).
8. The low frequency fracturing device according to claim 1, wherein the scroll mechanism (2) further comprises a bearing disposed around the axis of the upper housing (11), an outer ring of the bearing is connected to the first fixing frame (111) and the second fixing frame (112), and an inner ring of the bearing is fixed to the scroll (21).
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| CN202011553658.7A CN112814636B (en) | 2020-12-24 | 2020-12-24 | Low-frequency fracturing device |
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| CN202011553658.7A CN112814636B (en) | 2020-12-24 | 2020-12-24 | Low-frequency fracturing device |
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| CN112814636A CN112814636A (en) | 2021-05-18 |
| CN112814636B true CN112814636B (en) | 2023-02-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6296066B1 (en) * | 1997-10-27 | 2001-10-02 | Halliburton Energy Services, Inc. | Well system |
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| CN214303802U (en) * | 2020-12-24 | 2021-09-28 | 长江大学 | Low-frequency torsion one-way pulse fracturing tool |
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2020
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