CN209195305U - A kind of continuous inverse circular sand washing adapter Flushing tubular column - Google Patents
A kind of continuous inverse circular sand washing adapter Flushing tubular column Download PDFInfo
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- CN209195305U CN209195305U CN201821713376.7U CN201821713376U CN209195305U CN 209195305 U CN209195305 U CN 209195305U CN 201821713376 U CN201821713376 U CN 201821713376U CN 209195305 U CN209195305 U CN 209195305U
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- sand washing
- flushing
- pipe
- inverse circular
- washing adapter
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Abstract
The utility model provides a kind of continuous inverse circular sand washing adapter Flushing tubular column, continuous inverse circular sand washing adapter Flushing tubular column includes oil pipe, wellhead casing pipe four-way, single ram type perventer, well-flushing threeway, wellhead casing pipe four-way upper end connects single ram type perventer, single ram type perventer upper end connects well-flushing threeway, it further include bushing pipe, bushing pipe upper end is connect by screw thread with liner hanger, liner hanger is put into wellhead casing pipe four-way again, liner hanger is fixed with the hanger jackscrew of wellhead casing pipe four-way, liner hanger is equipped with sealing element, the oil pipe is respectively connected with continuous inverse circular sand washing adapter tool between any two, the oil pipe and the continuous inverse circular sand washing adapter tool connecting with oil pipe are intended in bushing pipe walk from top to bottom.The utility model realizes continuous inverse circular sand washing adapter operation, when single after be not necessarily to termination of pumping, effectively avoid depositing gravel, improve operating efficiency and operational security.
Description
Technical field
The utility model relates to the workover treatment technology of petroleum industry, especially a kind of continuous inverse circular sand washing adapter well-flushing pipe
Column.
Background technique
At present during traditional hydraulic sand washing, punch one it is single after, it is necessary to then first termination of pumping can just connect next punching
Sand is single, then restarts pump truck and carries out sand washing, since in operation process, the sand after termination of pumping in sand-carrying production liquid is fallen after rise,
The probability of sand card sand-flushing pipe column is increased, meanwhile, it sufficiently to be recycled before each termination of pumping, sand washing efficiency is relatively low.
For this purpose, domestic relevant unit has carried out correlative study to realize continuous sand washing technique.Liaohe Oil Field Song Yan force etc. is ground
The technique for having studied carefully a set of continuous positive sand washing, this set technology is mainly by positive sand flushing tool, Well head flow path, well mouth sealing device etc.
Composition, this set technology realizes continuous positive sand washing function, while this set technology has the disadvantage that (1) installation
Well mouth sealing device increases well head height, increases difficulty when well head construction；(2) connect sand washing it is single when, although not needing
Termination of pumping, but need manual adjustment valve spider handle change process, it is single connected after, it is also necessary to manually process is refunded, is increased
The risk of construction；(3) this sand washing process can only carry out positive sand washing, not can be carried out recoil sand.Middle petroleum gas share has
The reverse circulation continuous sand flushing commutation pipe nipple for limiting the researchs such as the Feng Zhen of limited liability company can carry out during inverse circular sand washing adapter
Liquid flow direction conversion, realizes continuous sand flushing.But manual operation conversion liquid flow direction is also needed when being made up a joint in the technology, together
When tool in there are elastic elements in sand cleaning fluid vulnerable influence tool reliability.The researchs such as the Wu Jian of TulufanHami oil field it is continuous
Negative pressure sand washing process tubing string includes self-styled sand washing, special suspension device, seal operation cylinder, backwash valve group, liquid stream converter, negative pressure
Sand washing pump etc..The set technique can realize continuous negative pressure sand washing, effective absorption well bed load, and most of load fluid will return out ground,
Sand can be carried out.But backwash valve therein, which enters after well head runner is opened, does not just have the work for blocking tubing pressure
With the blanking plug of sand-flushing hydraulic coupling uplink blocks in oil pipe at this time, and displacement of the blanking plug in tubing string is by tubing string
The driving of sand washing returning fluid, move it is uncontrollable, if blanking plug occur in tubing string and block may if cannot running to block-up position
Oil pipe can not correctly be blocked.
Therefore, current continuous sand washing technique there are aiming at the problem that, have studied and a set of be suitable for current workover treatment, and energy
Anti- sand washing operation is carried out, construction technology is simple, lower-cost process pipe string and its corollary apparatus.
Application number: 201611084312.0, publication date 2018-06-05 disclose a kind of inverse circular sand washing adapter Flushing tubular column, belong to
In oil well production field.The inverse circular sand washing adapter Flushing tubular column includes: that casing, wellhead oil tree four-way, self-sealing device, process duct are total
At, single oil tube, turn to crossover sub, blanking plug, sand washing oil pipe and sand-washing pen point；Using provided by the embodiment of the utility model
When inverse circular sand washing adapter Flushing tubular column, punch without termination of pumping during connecting new single oil tube after a single oil tube, in turn
It can avoid the sand being suspended in sand cleaning fluid in oil well and fall burial underground equipment after rise, underground sand card accident occurs, and punch one
After single oil tube, only new single oil tube need to be connected by turning to crossover sub above single oil tube, without dismantling oil
Single and outlet line is managed, it is easy to operate, and without dragging high-pressure fire hose, therefore the labour that can reduce site operation personnel is strong
Degree.
Application number: 201610859619.7, publication date 2017-03-22 disclose a kind of inverse circular sand washing adapter device and sand washing work
Skill tubing string, the inverse circular sand washing adapter device include: combination tube body, and combination tube body includes central tube and is sheathed on outer outside central tube
Pipe, outer tube are fixedly connected with central tube, form first annular cavity between outer tube and central tube, be provided on the tube wall of outer tube
Discharge orifice, flowing hole are connected with first annular cavity；Jet body, jet body are detachably connected with tube body is combined；Jet body and group
It closes and forms the second toroidal cavity between tube body, the second toroidal cavity is connected with first annular cavity, is arranged on the wall of jet body
There is the spray-hole of the second toroidal cavity of connection；Packer accessory, packer accessory are sheathed on outer tube and are slidably matched with outer tube, packer accessory position
Between flowing hole and jet body；Above mention inverse circular sand washing adapter device, jet body with combine tube body and mutually separate, packer accessory and outer tube phase point
From.The utility model, which realizes, provides a kind of purpose of inverse circular sand washing adapter device for being easy to solve desanding card accident.
Application number: 201620959617.0, publication date 2017-03-15 disclose a kind of whole process inverse circular sand washing adapter tubing string,
Including connector, filter plate, cylinder and it is mounted on the intracorporal milling tooth for fishing out basket and being welded on cylinder body bottom of cylinder, connector is conically shaped
Structure, the inner wall belt of one end have the female thread for connected pipes, and the outer wall belt of the other end has the pin thread for connector drum；Cylinder
The female thread for jointing is had for one end, the other end is welded with the cylinder with milling tooth；Fishing basket is 6 loose-leaf structures,
When fluid carries stone uplink, loose-leaf is opened, and is stopped loose-leaf when circulation and is closed, and the naturally lower backwardness of stone is deposited in loose-leaf
Fishing basket in, can fish out and obtain major diameter stone；Filter plate is installed in the tubing coupling between cylinder and connector.Use whole process reacting cycle
Sand-flushing pipe column carries out inverse circular sand washing adapter, small particle sand grains and stone can be effectively washed till to ground, big partial size sand grains and stone pass through
It acts whole process inverse circular sand washing adapter tubing string and takes ground out of, achieve the purpose that safe and efficient cleaning pit shaft.
Technical solution disclosed in technology disclosed above does not bring any technical inspiration to the application.
Utility model content
The purpose of this utility model is to provide a kind of continuous inverse circular sand washing adapter Flushing tubular columns, realize continuous inverse circular sand washing adapter
Operation, when single after be not necessarily to termination of pumping, effectively avoid depositing gravel, improve operating efficiency and operational security.
The purpose of this utility model can be realized by following technical measures:
The continuous inverse circular sand washing adapter Flushing tubular column includes oil pipe, further includes inverse circular sand washing adapter tool, bushing pipe, the oil pipe two
It is respectively connected with continuous inverse circular sand washing adapter tool between two, collectively forms tubular column string, the bushing pipe upper end is outstanding by screw thread and bushing pipe
Hanging device connection, liner hanger are put into wellhead casing pipe four-way, and the liner hanger is fixed on the suspension of wellhead casing pipe four-way
On device jackscrew, the tubular column string is walked from top to bottom in bushing pipe.
The purpose of this utility model can also be realized by following technical measures:
The continuous inverse circular sand washing adapter tool includes top connection, outer tube, central tube, lower contact, setting in the top connection
Upper valve base, the outer tube upper end connect top connection, and outer tube lower end connects lower contact, and outer tube wall circumference uniform distribution opens up circulation stream
Lower valve base is arranged in road, the central tube lower semisection inner wall, and central tube upper semisection side wall circumference uniform distribution opens up recirculation hole, on outer tube
Connection runner correspond, annular space is formed between central tube and outer tube, the outer wall lower part of the outer tube is equipped with sealing ring, close
Seal ring can seal the annulus space between continuous inverse circular sand washing adapter tool and bushing pipe.
The continuous inverse circular sand washing adapter tool further includes slide valve lever, upper valve core, connecting rod, bottom spool, in the connecting rod
End is across central tube upper port, and central tube upper port is that sliding sealing is connect with connecting rod, and slide valve lever upper end connects upper valve core,
Upper valve core is corresponding with upper valve base, and connecting rod lower end connects bottom spool, and bottom spool is corresponding with lower valve base, moves down on slide valve lever
Dynamic, upper valve core can cooperate the opening and closing of upper valve base realization flow path, and bottom spool can cooperate the opening and closing of lower valve base realization flow path.
Self-sealing rubber core is set inside the well-flushing threeway upper port, and the upper surface of self-sealing rubber core is placed from sealed cover, self-styled pressure
Lid is bolted with well-flushing threeway using flange connection, so that self-sealing rubber core be compressed.
Wellhead casing pipe four-way upper end connects single ram type perventer, and single ram type perventer upper end connects well-flushing threeway.
In order to achieve the above objectives, the utility model provides following technical scheme, continuous inverse circular sand washing adapter tool, including
Top connection, outer tube, central tube, lower contact, the top connection is interior to be arranged upper valve base, and the outer tube upper end connects top connection, outer tube
Lower end connects lower contact, and outer tube wall circumference uniform distribution opens up circulation runner, and lower valve base is arranged in the central tube lower semisection inner wall, in
Heart pipe upper semisection side wall circumference uniform distribution opens up recirculation hole, corresponds with the connection runner on outer tube, between central tube and outer tube
Annular space is formed, the outer wall lower part of the outer tube is equipped with sealing ring, and sealing ring can seal continuous inverse circular sand washing adapter tool and bushing pipe
Between annulus space.
The continuous inverse circular sand washing adapter tool further includes slide valve lever, upper valve core, connecting rod, bottom spool, in the connecting rod
End is across central tube upper port, and central tube upper port is that sliding sealing is connect with connecting rod, and slide valve lever upper end connects upper valve core,
Upper valve core is corresponding with upper valve base, and connecting rod lower end connects bottom spool, and bottom spool is corresponding with lower valve base, moves down on slide valve lever
Dynamic, upper valve core can cooperate the opening and closing of upper valve base realization flow path, and bottom spool can cooperate the opening and closing of lower valve base realization flow path.
Compared to the prior art, the utility model has the following beneficial effects:
1. not termination of pumping when inverse circular sand washing adapter makes up a joint can be effectively prevented from sand setting card caused by due to termination of pumping makes up a joint and run affairs
Therefore reduce operation processing sand card and overhaul solution desanding card job execution；
2. back with water inlet line and rotary hose are both connected to well head, frequently disassembly is not had in operation process, sand washing operation can be reduced
Labor intensity, and avoid elbow from falling off and cause personal injury accidents；
3. no pressure connects single, high safety and reliability；
4. continuous not termination of pumping sand washing operation is high-efficient, while sand washing can be improved and return out effect, to optimization sand washing operation matter
Amount extends the oil well production period, increases crude output and plays an important role；
5. process pipe string structure is simple, easy to install and use, while shaft mouth operation height is low.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the continuous reacting cycle Flushing tubular column of the utility model；
Fig. 2 is the continuous inverse circular sand washing adapter tool construction schematic diagram of the utility model.
In figure: 1-oil pipe；2-from sealed cover；3-self-sealing rubber cores；4-well-flushing threeways；5-single ram type perventers；6—
Wellhead casing pipe four-way；7-liner hangers；8-bushing pipes；9, continuous inverse circular sand washing adapter tool；9.1-top connections；9.2-upper valves
Seat；9.3-slide valve levers；9.31-upper valve core；9.32-connecting rod；9.33-bottom spool；9.4-outer tubes；9.5-connection streams
Road；9.6-central tubes；9.7-recirculation holes；9.8-lower valve bases；9.9-sealing rings；9.10-lower contact；10-oil pipes；11—
Casing.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Fig. 1 to Fig. 2 is please referred to, the utility model provides a kind of technical solution: continuous inverse circular sand washing adapter Flushing tubular column, mainly
Including oil pipe 1, continuous inverse circular sand washing adapter well-flushing tool 9, bushing pipe and wellhead assembly.By from sealed cover 2, self-sealing rubber core 3, well-flushing three
Logical 4, single ram type perventer 5, wellhead casing pipe four-way 6, liner hanger 7, bushing pipe 8, continuous inverse circular sand washing adapter tool 9, oil pipe 10,
Casing 11 forms.Bushing pipe 8 is connect by screw thread with liner hanger 7, and liner hanger 7 is put into wellhead casing pipe four-way after connection
In 6, with the hanger jackscrew of wellhead casing pipe four-way 6 that liner hanger 7 is fixed, liner hanger 7 is equipped with sealing element, thus
Form the annular space of bushing pipe 8 and casing 11, the length of bushing pipe 8 be greater than oil pipe 1 and continuous inverse circular sand washing adapter tool 9 length it
With；4 single ram type perventer 5 of well-flushing threeway and wellhead casing pipe four-way 6 are connected by flange connection respectively；Self-sealing rubber core 3
It is mainly used for sealing oil pipe, is placed in the upper surface of self-sealing rubber core 3 from sealed cover 2, designs from sealed cover 2 and led to by oil pipe or tool
The through-hole crossed is bolted, so that self-sealing rubber core 3 be pressed using flange connection with well-flushing threeway 4 from sealed cover 2
Tightly.
As shown in Fig. 2, continuous inverse circular sand washing adapter tool 9 is mainly by top connection 9.1, upper valve base 9.2, slide valve lever 9.3, outer tube
9.4, central tube 9.6, lower valve base 9.8, sealing ring 9.9 and lower contact 9.10 form.Top connection 9.1 passes through screw thread and top oil
Pipe connection.Upper valve core 9.2 is assemblied in top connection 9.1, and 9.4 top of outer tube connects top connection 9.2, and lower part connects lower contact
9.10,9.4 side wall circumference uniform distribution of outer tube opens up multiple groups connection runner 9.5, central tube 9.6 and the coaxial company of fitting through of outer tube 9.4
Passage flow duct 9.5 connects, and slide valve lever 9.3 is assembled at 9.6 center of central tube, and lower end connects lower valve base 9.8, and side wall circumference uniform distribution opens up more
Column recirculation hole 9.7, each column recirculation hole 9.7 are corresponded with runner 9.5 is connected to, and 9.4 external fluid of outer tube can be circulated by multiple groups
Hole 9.5 flows into central tube, and slide valve lever 9.3 includes upper valve core 9.31, connecting rod 9.32, and bottom spool 9.33 controls respectively
The folding of valve seat 9.2, lower valve base 9.8 is slidingly sealed by central tube 9.6 by sealing element.When fluid pressure in central tube 9.6
When power is greater than Fluid pressure at lower contact 9.10, slide valve lever 9.3 is moved down, and bottom spool 9.33 falls into lower valve base 9.8, makes lower valve base
9.8 close, and upper valve core 9.31 is far from upper valve base 9.2 at this time, then upper valve base 9.2 is opened, when 9.4 fluid pressure of central tube is less than
At lower contact 9.10 when Fluid pressure, slide valve lever 9.3 is moved up, and bottom spool 9.33 leaves lower valve base 9.8, then lower valve base 9.8 is opened,
And upper valve core 9.31 enters upper valve base 9.2, upper valve base 9.2 is closed at this time.Connecting passage 9.7 between central tube 9.6 and outer tube 9.4
Interior fluid is non-negotiable in the case where lower inlet 9.8 is closed with the liquid in central tube 9.4.Continuous inverse circular sand washing adapter tool 9
The lower contact 9.10 of lower end is connect by screw thread with lower section oil pipe.It is equipped with sealing ring 9.9 in the lower part of outer tube 9.4, it is salable
Annulus space between tool and bushing pipe 8 flows the annular space below the annular space and sealing ring of 9.9 top of sealing ring not
It is logical.
When carrying out inverse circular sand washing adapter clean-out service, the flank nozzle of four-way junction of casing 6 connects flushing fluid feed liquor pipeline, flushing fluid
Enter pit shaft, while the nozzle connection rotary hose or steel pipeline of well-flushing threeway 4 by four-way junction of casing 6, is closed under sand-flushing pipe column
After sand washing position, well mouth oil pipe connects continuous inverse circular sand washing adapter tool 9, after continued access oil pipe on continuous inverse circular sand washing adapter tool 9,
Make to arrive in bushing pipe 8 under continuous inverse circular sand washing adapter tool 9.
Flushing fluid flows to shaft bottom by oil jacket annulus, carries shaft bottom gravel and returns to tubing string.Continuous in bushing pipe 8 counter follows at this time
Sealing ring 9.9 and bushing pipe 8 on ring sand flushing tool 9 isolate independent upper annulus.Upper annulus fluid and central tube at this time
It is in fluid communication in 9.6, center overpressure is made to be less than pressure in the connected pipes of lower part, so that upper load fluid pushes slide valve lever
9.3 move up, lower valve base 9.8 open, upper valve base 9.2 close, therefore load fluid enter central tube 9.6 by connection runner 9.5 into
Enter upper annulus, well head is then flowed out by well-flushing threeway 4.Due to continuous inverse circular sand washing adapter in bushing pipe 8 during sand washing operation
9.3 upper plug head of slide valve of tool 9 is in close state always, then continuous 9 top tubing string of inverse circular sand washing adapter tool is constantly in nothing
Pressure state, therefore can realize that no pressure not termination of pumping makes up a joint.Instantly after complete root canal column, it is continuous anti-that wellhead column continues connection
Recycle sand flushing tool 9, and the root canal column under the connection of continuous 9 upper end of inverse circular sand washing adapter tool.During tubing string downlink sand washing, newly
The continuous inverse circular sand washing adapter tool 9 of tripping in enters bushing pipe 8, start more than working condition, and the continuous reacting cycle punching in former bushing pipe 8
9 downlink of sand tool deviates from bushing pipe 8.Continuous inverse circular sand washing adapter tool 9 at this time due in oil jacket annulus sand cleaning fluid can pass through circulation
Hole 9.5 enters central tube 9.6, so that pressure is greater than pressure in connecting passage 9.7 in central tube 9.6 at this time, drives slide valve lever 9.3
It moves down, lower valve base 9.8 is closed, and upper valve base 9.2 is opened, therefore the load fluid returned up from lower part oil pipe directly passes through outer tube 9.4
And the annular space of central tube 9.6 flows into top oil pipe.The continuous inverse circular sand washing adapter tool 9 of all abjection bushing pipes 8 is with identical simultaneously
Mode pass through load fluid.
In the description of the present invention, it should be understood that temporald eixis or positional relationship are based on the figure
Orientation or positional relationship is merely for convenience of description the utility model, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired
Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.
Claims (5)
1. a kind of continuous inverse circular sand washing adapter Flushing tubular column, including oil pipe, which is characterized in that further include inverse circular sand washing adapter tool, lining
Pipe, the oil pipe are respectively connected with continuous inverse circular sand washing adapter tool between any two, collectively form tubular column string, and the bushing pipe upper end passes through
Screw thread is connect with liner hanger, and liner hanger is put into wellhead casing pipe four-way, and the liner hanger is fixed on well head set
On the hanger jackscrew of pipe four-way, the tubular column string is walked from top to bottom in bushing pipe.
2. a kind of continuous inverse circular sand washing adapter Flushing tubular column according to claim 1, which is characterized in that the continuous reacting cycle
Sand flushing tool includes top connection, outer tube, central tube, lower contact, and upper valve base, the outer tube upper end connection are arranged in the top connection
Top connection, outer tube lower end connect lower contact, and outer tube wall circumference uniform distribution opens up circulation runner, and the central tube lower semisection inner wall is set
Lower valve base is set, central tube upper semisection side wall circumference uniform distribution opens up recirculation hole, corresponds with the connection runner on outer tube, central tube
Annular space is formed between outer tube, the outer wall lower part of the outer tube is equipped with sealing ring, and sealing ring can seal continuous inverse circular sand washing adapter
Annulus space between tool and bushing pipe.
3. a kind of continuous inverse circular sand washing adapter Flushing tubular column according to claim 2, which is characterized in that the continuous reacting cycle
Sand flushing tool further includes slide valve lever, upper valve core, connecting rod, bottom spool, and the connecting rod upper end passes through central tube upper port, center
Pipe upper port is that sliding sealing is connect with connecting rod, and slide valve lever upper end connects upper valve core, and upper valve core is corresponding with upper valve base, even
Extension bar lower end connects bottom spool, and bottom spool is corresponding with lower valve base, and slide valve lever moves up and down, and upper valve core can cooperate upper valve base to realize
The opening and closing of flow path, bottom spool can cooperate the opening and closing of lower valve base realization flow path.
4. a kind of continuous inverse circular sand washing adapter Flushing tubular column according to claim 1, which is characterized in that the wellhead casing pipe four
Logical upper end connects single ram type perventer, and single ram type perventer upper end connects well-flushing threeway.
5. a kind of continuous inverse circular sand washing adapter Flushing tubular column according to claim 4, which is characterized in that in the well-flushing threeway
Self-sealing rubber core is set inside port, and the upper surface of self-sealing rubber core is placed from sealed cover, is connected from sealed cover and well-flushing threeway using flange
The mode of connecing is bolted, so that self-sealing rubber core be compressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821713376.7U CN209195305U (en) | 2018-10-22 | 2018-10-22 | A kind of continuous inverse circular sand washing adapter Flushing tubular column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821713376.7U CN209195305U (en) | 2018-10-22 | 2018-10-22 | A kind of continuous inverse circular sand washing adapter Flushing tubular column |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209195305U true CN209195305U (en) | 2019-08-02 |
Family
ID=67408814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821713376.7U Withdrawn - After Issue CN209195305U (en) | 2018-10-22 | 2018-10-22 | A kind of continuous inverse circular sand washing adapter Flushing tubular column |
Country Status (1)
| Country | Link |
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| CN (1) | CN209195305U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111075372A (en) * | 2018-10-22 | 2020-04-28 | 中国石油化工股份有限公司 | Continuous reverse circulation sand washing well washing pipe column and sand washing tool thereof |
-
2018
- 2018-10-22 CN CN201821713376.7U patent/CN209195305U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111075372A (en) * | 2018-10-22 | 2020-04-28 | 中国石油化工股份有限公司 | Continuous reverse circulation sand washing well washing pipe column and sand washing tool thereof |
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Granted publication date: 20190802 Effective date of abandoning: 20230804 |