CN110318694B - Negative pressure backwashing device - Google Patents
Negative pressure backwashing device Download PDFInfo
- Publication number
- CN110318694B CN110318694B CN201910714813.XA CN201910714813A CN110318694B CN 110318694 B CN110318694 B CN 110318694B CN 201910714813 A CN201910714813 A CN 201910714813A CN 110318694 B CN110318694 B CN 110318694B
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- nozzle
- connecting pipe
- liquid inlet
- communicated
- cone valve
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- 238000011001 backwashing Methods 0.000 title claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 239000011148 porous material Substances 0.000 claims abstract description 31
- 238000004891 communication Methods 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- 239000004576 sand Substances 0.000 abstract description 31
- 238000005406 washing Methods 0.000 abstract description 23
- 230000000694 effects Effects 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
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)
- Nozzles (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The invention discloses a negative pressure backwashing device, which comprises an upper joint, a first connecting pipe, a second connecting pipe, a backwashing head and a sleeve jet pump assembly, wherein the sleeve jet pump assembly is arranged in the first connecting pipe and comprises a pore throat pipe seat body, kong Houguan, a nozzle and a shell, and one end of the nozzle extends into the pore throat pipe; the side wall of the first connecting pipe is provided with a first liquid inlet which is communicated with the pore throat pipe through a first flow passage; the closed end of the backwash head is provided with a second liquid inlet hole which is communicated with the pore throat pipe through a second flow passage, and the first flow passage and the second flow passage are not communicated. According to the invention, the sleeve jet pump assembly is arranged to form negative pressure, so that sand washing liquid is attracted to a wellhead, and the backwashing efficiency is improved; by arranging the ball valve, the ball valve seat and the reset spring, sand washing liquid is prevented from entering the first flow passage through the nozzle; through setting up filter screen mesh can filter sand washing liquid, can avoid the nozzle to block up and further improve the backwash effect.
Description
Technical Field
The invention relates to a production string in petroleum exploitation, in particular to a negative pressure backwashing device in the production string.
Background
With the continuous deep petroleum exploitation, the water demand of the oil field is increased, the number of the water source wells is also increased greatly, so that the faults caused by sand production at the bottom of the well or blockage of mechanical impurities are also increased, and the workload of the water source wells is also increased. In the development process, the problem of stratum sand production is frequently encountered, stratum sand is settled in a shaft to form sand columns and sand beds, perforation holes and stratum tunnels near the well wall are blocked, so that the flow resistance of fluid at the bottom of the well is increased, the yield is reduced, and the normal production of an oil well is influenced when serious; many wells are in overload conditions, plus problems of aging, and therefore systematic well flushing must be performed. In order to meet the requirement of backwashing well operation in petroleum exploitation, backwashing operation is usually carried out in a production string, and the currently commonly used backwashing device has low efficiency, influences the exploitation progress of an oil well and reduces the production efficiency.
Disclosure of Invention
The invention aims to overcome the technical defects, and provides a negative pressure backwashing device which solves the technical problems that the backwashing efficiency of the existing backwashing well device in the prior art is low, the exploitation progress of an oil well is influenced, and the production efficiency is reduced.
In order to achieve the technical aim, the technical scheme of the invention comprises an upper joint, a first connecting pipe, a second connecting pipe, a backwash head and a sleeve jet pump assembly, wherein one end of the first connecting pipe is connected with the upper joint, the other end of the first connecting pipe is connected with one end of the second connecting pipe, and the other end of the second connecting pipe is connected with the backwash head; the sleeve jet pump assembly is arranged in the first connecting pipe and comprises a pore throat pipe seat body, kong Houguan, a nozzle and a shell, wherein the pore throat pipe seat body, the Kong Houguan, the nozzle and the shell are fixedly arranged in the first connecting pipe, the pore throat pipe is fixedly arranged through the pore throat pipe seat body, the nozzle is fixedly arranged through the shell, and one end of the nozzle extends into the pore throat pipe; a first liquid inlet is formed in the side wall of the first connecting pipe and is communicated with the pore throat pipe through a first flow passage; the closed end of the backwash head is provided with a second liquid inlet hole, the second liquid inlet hole is communicated with the pore throat pipe through a second flow passage, and the first flow passage is not communicated with the second flow passage.
Further, the nozzle is fixedly arranged in the shell through the nozzle positioning seat, one end of the nozzle penetrates through the stepped groove in the shell to extend into the pore throat pipe, the other end of the nozzle is in contact with the nozzle positioning seat, and the nozzle positioning seat is connected with the shell through bolts.
Further, the sleeve jet pump assembly can be switched between a first position in which the first liquid inlet is not communicated with the orifice throat and a second position in which the first liquid inlet is communicated with the orifice throat.
Still further, there are ball valve seats, supporting bodies, reset springs and ball valves in the said body, the said ball valve seat is screwed with said nozzle locating seat, one end of the said ball valve seat contacts with said nozzle, another end contacts with said supporting body, the said supporting body is screwed with said body; the reset spring and the ball valve are arranged in an area surrounded by the ball valve seat, the supporting body and the nozzle, one end of the reset spring is abutted with the nozzle, and the other end of the reset spring is abutted with the ball valve; the ball valve seat is internally communicated with a first cavity, a second cavity and a third cavity, the diameters of the first cavity, the ball valve and the third cavity are sequentially increased, and the second cavity is a conical cavity in transition between the first cavity and the third cavity; when the ball valve is at the first position, the ball valve is tightly attached to the second cavity, and the first liquid inlet is not communicated with the pore throat pipe; and when the first position is at the second position, a gap is formed between the ball valve and the first cavity, and the first liquid inlet is communicated with the pore throat pipe.
Further, a filter screen is arranged at the first liquid inlet hole, and the filter screen is connected with the first connecting pipe through a bolt.
Further, the negative pressure backwash device further comprises a stopper, the stopper is in threaded connection with the first connecting pipe, one end of the stopper is in contact with the shell, and the other end of the stopper is in contact with the orifice throat seat body.
Further, a cone valve assembly is further arranged in the second connecting pipe, the cone valve assembly can be switched between a first state and a second state, and the second liquid inlet is not communicated with the orifice throat pipe in the first state; and in the second state, the second liquid inlet hole is communicated with the pore throat pipe.
Further, the cone valve assembly comprises a cone valve seat, a cone valve reset spring and a cone valve core, one end of the cone valve seat is in threaded connection with the second connecting pipe, and the other end of the cone valve seat extends into the opening end of the cone valve core; one end of the cone valve reset spring is contacted with the cone valve seat, and the other end of the cone valve reset spring is abutted with the cone valve core; the cone valve core can be attached to the inner wall of the second connecting pipe, and a through hole is formed in the part, which is attached to the second connecting pipe, of the cone valve core; when the cone valve assembly is in the first state, the through hole is attached to the inner wall of the second connecting pipe, the through hole is not communicated with the second liquid inlet, and when the cone valve assembly is in the second state, the through hole is communicated with the second liquid inlet.
Further, the second liquid inlet is a concave conical spray hole, and the concave conical spray hole is communicated with the inner cavity of the backwash head through a third flow passage.
Further, a third liquid inlet is further formed in the side wall of the backwash head, the third liquid inlet is communicated with the inner cavity of the backwash head through a fourth flow passage, and the fourth flow passage is obliquely arranged.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the sleeve jet pump assembly is arranged, so that negative pressure can be formed near the nozzle, which is beneficial to sucking part of sand washing liquid with insufficient power to a wellhead, and the backwashing efficiency is improved; by arranging the ball valve, the ball valve seat and the reset spring, the flow condition of the sand washing liquid is controlled, and the sand washing liquid is prevented from entering the first flow passage through the nozzle; the sand washing liquid can be filtered by arranging the filter screen at the first liquid inlet, so that the blockage of the nozzle can be avoided and the backwashing effect can be further improved; meanwhile, the cone valve assembly is arranged, so that the unidirectional flow of the sand washing liquid can be further controlled.
Drawings
FIG. 1 is a schematic diagram of a negative pressure backwash device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the first connecting tube and sleeve jet pump assembly of FIG. 1;
FIG. 3 is a schematic diagram of an embodiment of the second connecting tube and cone valve assembly of FIG. 1.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the term "connected" should be interpreted broadly, unless explicitly stated or defined otherwise, and may be, for example, fixedly connected, detachably connected, or integrally connected. Can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The invention provides a negative pressure backwashing device, and particularly referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the negative pressure backwashing device. The negative pressure backwashing device at least comprises an upper joint 1, a first connecting pipe 2, a second connecting pipe 15, a backwashing head 19 and a sleeve jet pump assembly, one end of the first connecting pipe 2 is connected with the upper joint 1, the other end of the first connecting pipe 2 is connected with one end of the second connecting pipe 15, and the other end of the second connecting pipe 15 is connected with the backwashing head 19. The sleeve jet pump assembly is arranged in the first connecting pipe 2, and sand washing liquid can be further attracted by the sleeve jet pump assembly, so that backwashing efficiency is improved.
In this embodiment, the upper joint 1, the first connecting pipe 2 and the second connecting pipe 15 are hollow structures with two open ends, the backwash head 19 is a hollow structure with one open end and one closed end, and the connection modes thereof can be respectively set into a threaded connection, a bolt connection, a buckle connection or the like according to respective needs.
In order to further explain the details of each structure in the negative pressure backwashing device provided by the embodiment of the invention, the details are described with reference to the accompanying drawings.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a first connection tube and a sleeve jet pump assembly according to an embodiment of the invention. In this embodiment, the sleeve jet pump assembly is disposed in the first connecting pipe 2, the sleeve jet pump assembly includes a orifice throat pipe seat 3, an orifice throat pipe 4, a nozzle 6 and a housing 14, kong Houguan 4 is fixedly disposed in the first connecting pipe 2 through the orifice throat pipe seat 3, the nozzle 6 is fixedly disposed in the first connecting pipe 2 through the housing 14, one end of the nozzle 6 extends into the orifice throat pipe 4, and a gap is disposed between the nozzle 6 and the inner wall of the orifice throat pipe 4.
Specifically, the orifice throat seat body 3 and the housing 14 are fixedly arranged in the first connecting pipe 2 through bolts 5. Wherein, the orifice throat seat body 3 is in threaded connection with the orifice throat 4.
Further, a first liquid inlet is formed on the side wall of the first connecting tube 2, and the first liquid inlet is communicated with the pore throat tube 4 through a first flow passage 1401. The closed end of the backwash head 9 is provided with a second liquid inlet port which communicates with the pore throat 4 through a second flow passage 1402 and is not in communication between the first flow passage 1401 and the second flow passage 1402. The second through-flow channel 1402 may be selectively disposed in the inner cavity of the housing 14 or in a region surrounded by the housing 14 and the side wall of the first connecting tube 2 according to need.
In general, the sand washing liquid flows through the first through-flow channel 1401 and the nozzle 6 via the first inlet Kong Yici, and forms a negative pressure area near the nozzle 6, further attracts the sand washing liquid reversely discharged from the backwash head 19, and the sand washing liquid enters the throat 4 to be reversely discharged to the wellhead after being mixed with the sand washing liquid entering from the first inlet.
As a preferred embodiment, the nozzle 6 is fixedly arranged in the shell 14 through the nozzle positioning seat 9, one end of the nozzle 6 extends into the orifice pipe 4 through a stepped groove in the shell 14, the other end of the nozzle 6 is in contact with the nozzle positioning seat 9, and the nozzle positioning seat 9 is connected with the shell 14 through bolts. Specifically, the portion of the nozzle 6 that contacts the stepped groove is the first flange, and the first flange is fitted to the stepped groove.
As a preferred embodiment, the cannula jet pump assembly is switchable between a first position and a second position to control the communication of the first inlet port with the orifice throat 4. In the first position, the sleeve jet pump assembly is in a closed state, the first liquid inlet is not communicated with the pore throat pipe 4, and in the second position, the sleeve jet pump assembly is in an open state, and the first liquid inlet is communicated with the pore throat pipe 4. In this way, the flow condition of the sand washing liquid is controlled, the sand washing liquid is prevented from entering the first flow passage 1401 through the nozzle 6, and the backwashing efficiency is further improved.
As a preferred embodiment, a ball valve seat 11, a support body 13, a return spring 8 and a ball valve 10 are further arranged in the shell 14, the ball valve seat 11 is in threaded connection with the nozzle positioning seat 9, one end of the ball valve seat 11 is in contact with the nozzle 6, the other end of the ball valve seat is in contact with the support body 13, and the support body 13 is in threaded connection with the shell 14. The reset spring 8 and the ball valve 10 are arranged in the area surrounded by the ball valve seat 11, the supporting body 13 and the nozzle 6, one end of the reset spring 8 is abutted with the nozzle 6, and the other end is abutted with the ball valve 10. Further, the ball valve seat 11 is internally and continuously provided with a first cavity 1101, a second cavity and a third cavity, the diameters of the first cavity 1101, the ball valve 10 and the third cavity are sequentially increased, and the second cavity is a conical cavity in transition between the first cavity 1101 and the third cavity. In the first position, the ball valve 10 is tightly attached to the second cavity under the action of the return spring 8, and the sleeve jet pump assembly is in a closed state; in the second position, a gap is formed between the ball valve 10 and the second cavity under the action of sand washing liquid, and the sleeve jet pump assembly is in an open state. One end of the first chamber 1101 communicates with the first flow passage 1401, and the other end may communicate with the nozzle 6. The first through-flow channel 1401 is formed in a gap space between the housing 14 and the support 13.
As a preferred embodiment, a filter screen 12 is provided at the first inlet opening, the filter screen 12 being bolted to the first connecting tube 2. Wherein the filter screen 12 is used for filtering sand washing liquid to avoid blocking the nozzle.
As a preferred embodiment, it further comprises a stopper 7, the stopper 7 being screwed with the first connecting tube 2, one end of which is in contact with the housing 14 and the other end of which is in contact with the orifice holder body 13. Wherein the arrangement of the blocking 7 enables an axial positioning of the housing 14 and the orifice nozzle body 13 during installation. Meanwhile, the gap between the blocking 7 and the shell 14 and the hole throat seat 13 is a fifth overflow channel which is also communicated with the hole throat 4.
As a preferred embodiment, a cone valve assembly is further disposed in the second connecting tube 15, and the cone valve assembly can be switched between a first state and a second state, so as to control the communication condition between the second liquid inlet and the orifice throat tube 4. In the first state, the cone valve assembly is in a closed state, and the second liquid inlet is not communicated with the pore throat pipe 4; in the second state, the cone valve assembly is in an open state, and the second liquid inlet hole is communicated with the pore throat pipe 4. The cone valve assembly is convenient for further controlling the unidirectional flow of the sand washing liquid.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of the second connecting pipe and cone valve assembly in fig. 1. In this embodiment, the cone valve assembly is disposed in the second connection pipe 15, and the cone valve assembly includes a cone valve seat 16, a cone valve return spring 17 and a cone valve core 18, where one end of the cone valve seat 16 is in threaded connection with the second connection pipe 15, and the other end extends into the open end of the cone valve core 18; one end of the cone valve return spring 17 is in contact with the cone valve seat 16, and the other end is in contact with the cone valve core 18.
Specifically, the cone valve seat 16 is a hollow structure with two open ends, and the cone valve core 18 is a hollow structure with one open end and one closed end. The cone valve seat 16 comprises a base 161 and a second flange 162, and the cone valve return spring 17 is sleeved on the second flange 162 and is abutted with the base 161; an inner flange 181 is arranged in the cone valve core 18, and the other end of the cone valve return spring 17 is abutted against the inner flange 181. The provision of the closed end of the cone valve spool 18 facilitates increasing the force bearing surface of the fluid flow while increasing the axial force experienced by the cone valve spool 18 during backwashing.
Further, the cone valve core 18 may be attached to the inner wall of the second connecting pipe 15, and a through hole 1801 is provided at a portion of the cone valve core 18 attached to the second connecting pipe 15. When the cone valve assembly is in the first state, the through hole 1801 is attached to the inner wall of the second connecting pipe 15, the through hole 1801 is not communicated with the second liquid inlet, and when in the second state, the through hole 1801 is communicated with the second liquid inlet through the inner cavity of the backwash head 19.
Specifically, the joint part of the cone valve core 18 and the inner wall of the second connecting pipe 15 is a conical surface, a through hole 1801 is formed in the conical surface, and in the first state, under the action of the cone valve return spring 17, the conical surface of the cone valve core 18 is jointed with the inner wall of the second connecting pipe 15, and the through hole 1801 is closed; in the second state, the sand washing liquid injected from the annular space flows through the cone valve core 18 through the backwash head 19 and acts on the closed end of the cone valve core 18 to axially move the cone valve core 18, and a gap is formed between the conical surface of the cone valve core 18 and the second connecting pipe 15, so that the through hole 1801 is communicated with the second liquid inlet hole. Wherein, the setting of cone valve return spring 17 is favorable to realizing the automatic re-setting of cone valve case 18.
As a preferred embodiment, the second liquid inlet is a concave conical spray hole, and the concave conical spray hole is communicated with the inner cavity of the backwash head 19 through a third flow passage 1901.
As a preferred embodiment, the side wall of the backwash head 19 is further provided with a third liquid inlet, the third liquid inlet is communicated with the inner cavity of the backwash head 19 through a fourth flow passage 1902, and the fourth flow passage 1902 is obliquely arranged along the direction of the second connecting pipe 15, so that more sand washing liquid can enter the backwash head 19 from the third liquid inlet and is combined with the sand washing liquid entering the backwash head 19 from the second liquid inlet, the efficiency of the sand washing liquid entering the backwash head 19 is improved, and the backwash efficiency is further improved.
The following list of the negative pressure backwash device is a complete working process for the understanding of the invention: the flushing fluid enters the inner cavity of the backwash head 19 through the second fluid inlet hole, the third flow passage 1901, the third fluid inlet hole and the fourth flow passage 1902 at the tail end of the backwash head 19, pushes the closed end of the cone valve core 18, compresses the cone valve return spring 17, enables the through hole 1801 to be communicated with the third flow passage 1901 and the fourth flow passage 1902, enables the flushing fluid to flow through the sixth flow passage 1601 in the cone valve seat 16, flows through Kong Houguan through the second flow passage 1402, and then enters the upper joint 1 to be discharged to a wellhead through an oil pipe.
Meanwhile, part of well flushing liquid also enters the first through-flow channel 1401 through the first liquid inlet on the side wall of the connecting pipe 2, flows through the ball valve 11 and the nozzles 6 and Kong Houguan, forms opposite negative pressure near the outlet of the nozzle 6 at the moment, attracts sand flushing liquid reversely discharged from the lower backwash head 19 to enter the throat 3 to be mixed with the original sand flushing liquid, and changes high-speed fluid into high-pressure slow-speed fluid after passing through the throat 3 and carries sand to a wellhead through an oil pipe. Wherein the filter screen 12 is used for filtering sand washing liquid to avoid blocking the nozzle.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (5)
1. The negative pressure backwashing device is characterized by comprising an upper joint, a first connecting pipe, a second connecting pipe, a backwashing head and a sleeve jet pump assembly, wherein one end of the first connecting pipe is connected with the upper joint, the other end of the first connecting pipe is connected with one end of the second connecting pipe, and the other end of the second connecting pipe is connected with the backwashing head; the sleeve jet pump assembly is arranged in the first connecting pipe and comprises a pore throat pipe seat body, kong Houguan, a nozzle and a shell, wherein the pore throat pipe seat body, kong Houguan, the nozzle and the shell are fixedly arranged in the first connecting pipe, the nozzle is fixedly arranged in the shell through a nozzle positioning seat, one end of the nozzle extends into the pore throat pipe through a stepped groove in the shell, the other end of the nozzle is in contact with the nozzle positioning seat, and the nozzle positioning seat is connected with the shell through bolts; a first liquid inlet is formed in the side wall of the first connecting pipe and is communicated with the pore throat pipe through a first flow passage; the closed end of the backwashing head is provided with a second liquid inlet hole, the second liquid inlet hole is communicated with the pore throat pipe through a second flow passage, and the first flow passage is not communicated with the second flow passage;
The sleeve jet pump assembly can be switched between a first position and a second position, wherein in the first position, the first liquid inlet is not communicated with the pore throat pipe, and in the second position, the first liquid inlet is communicated with the pore throat pipe; the shell is internally provided with a ball valve seat, a support body, a reset spring and a ball valve, the ball valve seat is in threaded connection with the nozzle positioning seat, one end of the ball valve seat is in contact with the nozzle, the other end of the ball valve seat is in contact with the support body, and the support body is in threaded connection with the shell; the reset spring and the ball valve are arranged in an area surrounded by the ball valve seat, the supporting body and the nozzle, one end of the reset spring is abutted with the nozzle, and the other end of the reset spring is abutted with the ball valve; the ball valve seat is internally communicated with a first cavity, a second cavity and a third cavity, the diameters of the first cavity, the ball valve and the third cavity are sequentially increased, and the second cavity is a conical cavity in transition between the first cavity and the third cavity; when the ball valve is at the first position, the ball valve is tightly attached to the second cavity, and the first liquid inlet is not communicated with the pore throat pipe; when the first position is reached, a gap is formed between the ball valve and the first cavity, and the first liquid inlet is communicated with the orifice throat pipe;
The second connecting pipe is internally provided with a cone valve assembly, the cone valve assembly can be switched between a first state and a second state, and the second liquid inlet is not communicated with the pore throat pipe in the first state; in the second state, the second liquid inlet hole is communicated with the pore throat pipe; the cone valve assembly comprises a cone valve seat, a cone valve reset spring and a cone valve core, one end of the cone valve seat is in threaded connection with the second connecting pipe, and the other end of the cone valve seat extends into the opening end of the cone valve core; one end of the cone valve reset spring is contacted with the cone valve seat, and the other end of the cone valve reset spring is abutted with the cone valve core; the cone valve core can be attached to the inner wall of the second connecting pipe, and a through hole is formed in the part, which is attached to the second connecting pipe, of the cone valve core; when the cone valve assembly is in the first state, the through hole is attached to the inner wall of the second connecting pipe, the through hole is not communicated with the second liquid inlet, and when the cone valve assembly is in the second state, the through hole is communicated with the second liquid inlet.
2. The negative pressure backwash device of claim 1, wherein a filter screen is provided at the first feed port, the filter screen being bolted to the first connecting tube.
3. The negative pressure backwash device of claim 1 further comprising a stopper threadably connected to the first connection tube, one end of the stopper being in contact with the housing and the other end of the stopper being in contact with the orifice nozzle body.
4. The negative pressure backwash device of claim 1, wherein the second liquid inlet is a concave-cone orifice, the concave-cone orifice being in communication with the interior chamber of the backwash head through a third flow passage.
5. The negative pressure backwash device of claim 1, wherein a third liquid inlet is further provided on the backwash head sidewall, the third liquid inlet communicates with the inner cavity of the backwash head through a fourth flow passage, and the fourth flow passage is arranged obliquely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910714813.XA CN110318694B (en) | 2019-08-02 | 2019-08-02 | Negative pressure backwashing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910714813.XA CN110318694B (en) | 2019-08-02 | 2019-08-02 | Negative pressure backwashing device |
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| Publication Number | Publication Date |
|---|---|
| CN110318694A CN110318694A (en) | 2019-10-11 |
| CN110318694B true CN110318694B (en) | 2024-06-25 |
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| CN201910714813.XA Active CN110318694B (en) | 2019-08-02 | 2019-08-02 | Negative pressure backwashing device |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210622737U (en) * | 2019-08-02 | 2020-05-26 | 长江大学 | Negative pressure backwashing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277059B (en) * | 2013-05-30 | 2015-11-18 | 中国石油天然气股份有限公司 | Negative pressure combined sand washing and forced sand discharging device |
| CA3000012A1 (en) * | 2017-04-03 | 2018-10-03 | Anderson, Charles Abernethy | Differential pressure actuation tool and method of use |
| CN109356540B (en) * | 2018-11-30 | 2023-08-29 | 长江大学 | Circulation well flushing valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210622737U (en) * | 2019-08-02 | 2020-05-26 | 长江大学 | Negative pressure backwashing device |
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