CN207315332U - Heavy oil wells note adopts pipe - Google Patents
Heavy oil wells note adopts pipe Download PDFInfo
- Publication number
- CN207315332U CN207315332U CN201721247247.9U CN201721247247U CN207315332U CN 207315332 U CN207315332 U CN 207315332U CN 201721247247 U CN201721247247 U CN 201721247247U CN 207315332 U CN207315332 U CN 207315332U
- Authority
- CN
- China
- Prior art keywords
- vapour passage
- control
- heavy oil
- control valve
- steam injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Control Of Fluid Pressure (AREA)
Abstract
The utility model provides a kind of heavy oil wells note and adopts pipe, and heavy oil wells note, which adopts pipe, includes inner tube and control valve, wherein, inner tube is arranged on the inside of casing, and steam injection chamber is formed between the outer wall of inner tube and the inner wall of casing；First is provided with the valve body of control valve and leads vapour passage, first leads vapour passage is connected with the inner cavity of inner tube, second is provided with the side wall of the valve body of control valve and leads vapour passage, second leads the first end of vapour passage connects with the inner cavity of inner tube, second leads the second end of vapour passage is connected with the steam injection chamber of inner tube, control valve has the first position that steam injection is carried out to internal tube, with the second place that steam injection is carried out to internal tube and steam injection chamber, it is achieved thereby that screw pump band pumps steam injection, realize that note adopts integral process demand.
Description
Technical field
It the utility model is related to heavy oil wells note and adopt equipment technical field, pipe is adopted in particular to a kind of heavy oil wells note.
Background technology
At present, the methods of heavy crude heat extraction mainly includes steam soak, steam drives, conventional hot water drives, and wherein steam soak
The thermal recovery of various heavy oil wells is adapted to, and realizes higher recovery ratio.
Steam soak has higher requirement to pressure, temperature, mass dryness fraction, the quantity of injecting steam, to avoid steam soak
Heat loss is reduced as far as in the production processes such as injection, stewing well, it is now more that integrated oil well pump is adopted using note, realize note
Vapour, stewing well, open flow, integration of recovering the oil.The note now used adopts integrated oil well pump, steam be all using pump barrel as steam injection passage,
Due to the high temperature of steam and the characteristic of oil component, it is also easy to produce dirt and char layer is bonded on the working surface of pump barrel and plunger,
There is phenomena such as steam injection back-plunger cannot enter pump barrel and holddown, cause frequent workover treatment, influence oil well and normally produce,
Add a large amount of workover costs.
And screw pump can not also be realized that screw pump band pumps steam injection, be realized that note adopts one at present due to the characteristic of its resistance to temperature difference
Change process requirements.
Utility model content
The main purpose of the utility model is that providing a kind of heavy oil wells note adopts pipe, to solve of the prior art to use spiral shell
The problem of bar pumps.
To achieve these goals, the utility model provides a kind of heavy oil wells note and adopts pipe, and heavy oil wells note, which adopts pipe, to be included
Inner tube and control valve, wherein, inner tube is arranged on the inside of casing, and steam injection chamber is formed between the outer wall of inner tube and the inner wall of casing；
First is provided with the valve body of control valve and leads vapour passage, first leads vapour passage is connected with the inner cavity of inner tube, the valve body of control valve
Side wall in be provided with second and lead vapour passage, second leads the first end of vapour passage connects with the inner cavity of inner tube, and second leads vapour passage
Second end be connected with the steam injection chamber of inner tube, control valve has the first position that steam injection is carried out to internal tube, and to inner tube
Internal and steam injection chamber carries out the second place of steam injection.
Further, installation space is additionally provided with the side wall of the valve body of control valve, the bottom of installation space is led with second
Vapour passage is connected, and control valve includes control assembly, and control assembly is installed in installation space, when control valve is in first position
When, vapour passage is led in control assembly closure second；When control valve is in the second place, control assembly avoids second and leads vapour passage.
Further, control assembly includes：Control-rod, control-rod are movably disposed in installation space, control-rod
Bottom is provided with sealing, and the periphery of sealing is adapted with the side wall of installation space；It is close when control valve is in first position
Vapour passage is led in envelope portion closure second；When control valve is in the second place, sealing avoids second and leads vapour passage.
Further, sealing is rubber seal.
Further, control assembly further includes：The bottom connection of pressure control device, pressure control device and control-rod,
And preset pressure is applied to the bottom of control-rod, so that vapour passage is led in the bottom closure second of control-rod, when the pressure of inner cavity
When power is more than the preset pressure of pressure control device, the bottom of control-rod is open-top by vapour pressure, so that control valve switches to second
Put, steam leads vapour passage and second by first and leads vapour passage into steam injection chamber.
Further, pressure control device includes：Elastic pressure control part, the first end of elastic pressure control part are connected to installation space
Be connected to away from the second end for leading vapour passage, the second end of elastic pressure control part on sealing.
Further, elastic pressure control part is spring.
Further, pressure control device further includes：Pressure regulation part, pressure regulation part are removable along the direction of the center line of installation space
Dynamicly installed in installation space away from second one end for leading vapour passage, to form the end of installation space, elastic pressure control part
First end is connected on pressure regulation part.
Further, being led away from second for installation space is provided with internal thread on the side wall of vapour passage, the outside of pressure regulation part
External screw thread is provided with, external screw thread is adapted with internal thread, by rotating pressure regulation part to adjust the preset pressure of pressure control device.
Further, the top of casing and the valve body of control valve are connected through a screw thread.
Using the technical solution of the utility model, adopting pipe due to the heavy oil wells note of the utility model includes inner tube and control
Valve, wherein, first is provided with the valve body of control valve and leads vapour passage, first leads vapour passage is connected with the inner cavity of inner tube, control
Second is provided with the side wall of the valve body of valve and leads vapour passage, second leads the first end of vapour passage connects with the inner cavity of inner tube, and second
The second end of vapour passage to be led with the steam injection chamber of inner tube to be connected, control valve has the first position that steam injection is carried out to internal tube,
With the second place that steam injection is carried out to internal tube and steam injection chamber, without dismantling external structure, you can realize to steam injection intracavitary portion
Steam injection, screw pump band pump steam injection, realize that note adopts integral process demand.
Brief description of the drawings
The accompanying drawings which form a part of this application are used to provide a further understanding of the present invention, this practicality
New schematic description and description is used to explain the utility model, does not form the improper restriction to the utility model.
In the accompanying drawings：
Fig. 1 diagrammatically illustrate the utility model heavy oil wells note adopt pipe embodiment sectional view.
Wherein, above-mentioned attached drawing is marked including the following drawings：
10th, inner tube；11st, steam injection chamber；12nd, inner cavity；20th, casing；31st, valve body；311st, first vapour passage is led；313rd, second lead
Vapour passage；314th, installation space；32nd, control-rod；321st, sealing；322nd, spring；323rd, pressure regulation part.
Embodiment
It should be noted that in the case where there is no conflict, the feature in embodiment and embodiment in the application can phase
Mutually combination.The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
As described in background technology, the note now used adopts integrated oil well pump, and steam is all to be used as note using pump barrel
Vapour passage, due to the high temperature of steam and the characteristic of oil component, is also easy to produce dirt and char layer is bonded in the work of pump barrel and plunger
On surface, there is phenomena such as steam injection back-plunger cannot enter pump barrel and holddown, cause frequent workover treatment, influencing oil well just
Often production, adds a large amount of workover costs, and screw pump is due to the characteristic of its resistance to temperature difference, when carrying out steam injection to carrying out inside pipe casing
Need to dismantle external equipment, can not also realize that screw pump band pumps steam injection at present, realize that note adopts integral process demand.
To solve the above-mentioned problems, shown in Figure 1, the utility model provides a kind of heavy oil wells note and adopts pipe, the viscous crude
Well note, which adopts pipe, includes inner tube 10 and control valve, wherein, inner tube 10 is arranged on the inside of casing 20, outer wall and the casing 20 of inner tube 10
Inner wall between form steam injection chamber 11；Control valve is installed in inner tube 10, is provided with first on the valve body 31 of control valve and is led vapour and leads to
Road 311, first leads vapour passage 311 is connected with the inner cavity 12 of inner tube 10, and second is provided with the side wall of the valve body 31 of control valve
Vapour passage 313 is led, second leads the first end of vapour passage 313 connects with the inner cavity 12 of inner tube 10, and second leads the second of vapour passage 313
End is connected with the steam injection chamber 11 of inner tube 10, and control valve has the first position that steam injection is carried out to the inside of inner tube 10, and to inner tube
10 inside and steam injection chamber 11 carry out the second place of steam injection.When the inner cavity of the inner tube to the present embodiment carries out steam injection, can incite somebody to action
Control valve is switched to the second place, leads vapour passage by first and second leads vapour passage the steam in interior tube cavity is delivered to note
In vapour chamber 11, so as to fulfill the steam injection to steam injection chamber, need to dismantle external equipment when carrying out steam injection to progress inside pipe casing, at present
It can not also realize that screw pump band pumps steam injection, realize that note adopts integral process demand.
Specifically, installation space 314 is additionally provided with the side wall of the valve body 31 of the control valve in the present embodiment, installation is empty
Between 314 bottom lead vapour passage 313 with second and be connected, control valve includes control assembly, and control assembly is installed on installation space
In 314, when control valve is in first position, vapour passage 313 is led in control assembly closure second；When control valve is in the second place
When, control assembly avoids second and leads vapour passage 313.When needing to carry out steam injection to the steam injection chamber in the present embodiment, control valve is cut
The second place is changed to, control assembly avoids second and leads vapour passage at this time, to realize the steam injection to steam injection intracavitary portion.
Specifically, the control assembly in the present embodiment includes control-rod 32, and control-rod 32 is movably disposed at installation
In space 314, the bottom of control-rod 32 is provided with sealing 321, the periphery of sealing 321 and the side wall phase of installation space 314
Adaptation；When control valve is in first position, vapour passage 313 is led in the closure of sealing 321 second；When control valve is in the second place
When, sealing 321 avoids second and leads vapour passage 313.When needing to carry out steam injection to the steam injection chamber in the present embodiment, control valve is cut
The second place is changed to, the sealing of control-rod avoids second and leads vapour passage at this time, to realize the steam injection to steam injection intracavitary portion, in order to
Ensure sealing performance, the bottom of control-rod is provided with sealing in the present embodiment, to ensure that steam injection intracavitary need not be being carried out
During steam injection, the leakproofness of steam injection chamber.
Preferably, the sealing 321 in the present embodiment is rubber seal.Certainly, the sealing in the present embodiment also may be used
For miscellaneous part, as long as it disclosure satisfy that the structure of the sealing performance of sealing in the present embodiment.
In order to realize that the heavy oil wells of the present embodiment note adopts the automatic steam injection of pipe, the control assembly in the present embodiment further includes pressure
Force control device, pressure control device are connected with the bottom of control-rod 32, and apply preset pressure to the bottom of control-rod 32, with
The bottom of control-rod 32 is blocked second and lead vapour passage 313, the pressure inside inner cavity 12 is more than the default of pressure control device
During pressure, the bottom of control-rod 32 is open-top by vapour pressure, so that control valve switches to the second place, steam leads vapour passage by first
311 and second lead in the entrance steam injection of vapour passage 313 chamber 11.
Specifically, the pressure control device in the present embodiment includes elastic pressure control part, and the first end of elastic pressure control part is supported
Be connected on installation space 314 is connected to sealing 321 away from the second end for leading vapour passage 313, the second end of elastic pressure control part
On.
Preferably, the elastic pressure control part in the present embodiment is spring 322.
Preset pressure is adjusted in order to facilitate staff, the pressure control device in the present embodiment further includes pressure regulation
Part 323, the direction of pressure regulation part 323 along the center line of installation space 314 are movably mounted at remote the second of installation space 314
One end of vapour passage 313 is led, to form the end of installation space 314, the first end of elastic pressure control part is connected to pressure regulation part 323
On.When needing to tune up preset pressure value, staff moves pressure regulation part to the direction that vapour passage is led close to second, so that bullet
Spring is compacted, so as to increase preset pressure, when needing to reduce preset pressure value, staff leads pressure regulation part to away from second
The direction movement of vapour passage, so that spring is released certain distance, so as to reduce preset pressure.
Specifically, the installation space 314 in the present embodiment away from second lead and be provided with the side wall of vapour passage 313 in
Screw thread, the outside of pressure regulation part 323 are provided with external screw thread, and external screw thread is adapted with internal thread, by rotating pressure regulation part 323 to adjust
The preset pressure of pressure control device.
To improve connective stability, the top of casing 20 and the valve body 31 of control valve in the present embodiment are connected by screw thread
Connect.
It can be seen from the above description that the above embodiments of the present invention achieve the following technical effects：
Adopting pipe due to the heavy oil wells note of the utility model includes inner tube and control valve, wherein, set on the valve body of control valve
There is first to lead vapour passage, first leads vapour passage is connected with the inner cavity of inner tube, and second is provided with the side wall of the valve body of control valve
Vapour passage is led, second leads the first end of vapour passage connects with the inner cavity of inner tube, and second leads the note of the second end of vapour passage and inner tube
Vapour chamber is connected, and control valve has the first position that steam injection is carried out to internal tube, and internal tube and steam injection chamber are noted
The second place of vapour, it is achieved thereby that screw pump band pumps steam injection, realizes that note adopts integral process demand.
It is noted that above-mentioned detailed description is all illustrative, it is intended to provides further instruction to the application.It is unless another
Indicate, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
It should be noted that term " first " in the description and claims of this application and above-mentioned attached drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so use
Term can exchange in the appropriate case, so that presently filed embodiment described herein for example can be with except herein
Order beyond those of diagram or description is implemented.
In addition, term " comprising " and " having " and their any deformation, it is intended that cover it is non-exclusive include, example
Such as, process, method, system, product or the equipment for containing series of steps or unit are not necessarily limited to those clearly listed
Step or unit, but may include not list clearly or for intrinsic other of these processes, method, product or equipment
Step or unit.
For the ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be appreciated that spatially relative term is intended to comprising the orientation except device described in figure
Outside different azimuth in use or operation.
For example, if the device in attached drawing is squeezed, it is described as " above other devices or construction " or " in other devices
On part or construction " device after will be positioned as or " in other devices or constructing it " below other devices or construction "
Under ".Thus, exemplary term " in ... top " can include " in ... top " and " in ... lower section " two kinds of orientation.Should
Device can also other different modes positioning (being rotated by 90 ° or in other orientation), it is and opposite to space used herein above
Respective explanations are made in description.
In explanation in detail above, attached drawing is with reference to, attached drawing forms a part of this paper.In the accompanying drawings, similar symbol
Similar component number is typically determined, unless context otherwise indicates.In detailed description, attached drawing and claim
Embodiment illustrated described in book is not meant to be restricted.The spirit of theme presented herein is not being departed from
Or under scope, other embodiments can be used, and other changes can be made.It will be readily understood that as herein
The illustrated explanation of described and attached drawing, the aspect of the disclosure can be organized into broad category of different configuration, generation
Replace, combine, separating and designing, it is all these clearly to be considered in this paper.
Will be unrestricted according to the disclosure of particular described herein, it is intended to as various aspects
Illustrate., can be with the case where not departing from spirit and scope of the present disclosure as to those skilled in the art will being clear
Make many modifications and changes.In the range of the disclosure, functionally equivalent method and apparatus, except it is cited herein those it
Outside, from the point of view of book will be from the foregoing description clearly to those skilled in the art.Such modifications and changes are intended to fall into appended power
In the range of sharp claim.The disclosure only will give right by the clause and such claim of the appended claims
Equivalent four corner limitation.It will be appreciated that the present disclosure is not limited to specific method, reagent, compound, composition or life
Thing system, it is it is of course possible to changing.Also it will be appreciated that term as used herein is only in order at the specific embodiment of description
Purpose, and be not intended to be restricted.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the present invention, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on, should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of heavy oil wells note adopts pipe, it is characterised in that the heavy oil wells note, which adopts pipe, to be included：
Inner tube (10), said inner tube (10) are arranged on the inside of casing (20), the outer wall and described sleeve pipe of said inner tube (10)
(20) steam injection chamber (11) is formed between inner wall；
Control valve, the control valve are installed in said inner tube (10), are provided with first on the valve body (31) of the control valve and lead
Vapour passage (311), described first leads vapour passage (311) is connected with the inner cavity (12) of said inner tube (10), the control valve
Second is provided with the side wall of valve body (31) and leads vapour passage (313), described second lead the first end of vapour passage (313) with it is described interior
Inner cavity (12) connection of (10) is managed, described second leads the second end of vapour passage (313) and the steam injection chamber (11) of said inner tube (10)
It is connected, the control valve has the first position to carrying out steam injection inside said inner tube (10), and in said inner tube (10)
Portion and the steam injection chamber (11) carry out the second place of steam injection.
2. heavy oil wells note according to claim 1 adopts pipe, it is characterised in that in the side wall of the valve body (31) of the control valve
Installation space (314) is additionally provided with, the bottom of the installation space (314) leads vapour passage (313) with described second and is connected, institute
Stating control valve includes control assembly, and the control assembly is installed in the installation space (314), when the control valve is in institute
When stating first position, vapour passage (313) is led in the control assembly closure second；When the control valve is in the second place
When, the control assembly avoids described second and leads vapour passage (313).
3. heavy oil wells note according to claim 2 adopts pipe, it is characterised in that the control assembly includes：
Control-rod (32), the control-rod (32) are movably disposed in the installation space (314), the control-rod (32)
Bottom be provided with sealing (321), the periphery of the sealing (321) is adapted with the side wall of the installation space (314)；
When the control valve is in the first position, vapour passage (313) is led in sealing (321) closure described second；Work as institute
When stating control valve and being in the second place, the sealing (321) avoids described second and leads vapour passage (313).
4. heavy oil wells note according to claim 3 adopts pipe, it is characterised in that the sealing (321) is rubber seal.
5. heavy oil wells note according to claim 3 adopts pipe, it is characterised in that the control assembly further includes：
Pressure control device, the pressure control device are connected with the bottom of the control-rod (32), and to the control-rod
(32) bottom applies preset pressure, so that vapour passage (313) is led in the bottom closure described second of the control-rod (32), works as institute
When stating the internal pressure in inner cavity (12) and being more than the preset pressure of the pressure control device, the bottom of the control-rod (32) is by vapour
Bear down on one out, so that the control valve switches to the second place, steam is led vapour passage (311) and described second by described first and led
Vapour passage (313) enters in the steam injection chamber (11).
6. heavy oil wells note according to claim 5 adopts pipe, it is characterised in that the pressure control device includes：
Elastic pressure control part, the first end of the elasticity pressure control part are connected to remote described the second of the installation space (314) and lead
The end of vapour passage (313), the second end of the elasticity pressure control part are connected on the sealing (321).
7. heavy oil wells note according to claim 6 adopts pipe, it is characterised in that the elasticity pressure control part is spring (322).
8. heavy oil wells note according to claim 6 adopts pipe, it is characterised in that the pressure control device further includes：
Pressure regulation part (323), the pressure regulation part (323) are moveably mounted along the direction of the center line of the installation space (314)
In one end that remote described the second of the installation space (314) leads vapour passage (313), to form the installation space (314)
End, the first end of the elasticity pressure control part is connected on the pressure regulation part (323).
9. heavy oil wells according to claim 8 note adopts pipe, it is characterised in that the installation space (314) away from described
Second leads internal thread is provided with the side wall of vapour passage (313), and the outside of the pressure regulation part (323) is provided with external screw thread, described
External screw thread is adapted with the internal thread, and the default of the pressure control device is adjusted by rotating the pressure regulation part (323)
Pressure.
10. heavy oil wells note according to claim 3 adopts pipe, it is characterised in that the top of described sleeve pipe (20) and the control
The valve body (31) of valve processed is connected through a screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721247247.9U CN207315332U (en) | 2017-09-26 | 2017-09-26 | Heavy oil wells note adopts pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721247247.9U CN207315332U (en) | 2017-09-26 | 2017-09-26 | Heavy oil wells note adopts pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207315332U true CN207315332U (en) | 2018-05-04 |
Family
ID=62384389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721247247.9U Active CN207315332U (en) | 2017-09-26 | 2017-09-26 | Heavy oil wells note adopts pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207315332U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669038A (en) * | 2020-05-15 | 2021-11-19 | 青岛中瑞泰软控科技股份有限公司 | Screw pump injection-production integrated production device |
-
2017
- 2017-09-26 CN CN201721247247.9U patent/CN207315332U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669038A (en) * | 2020-05-15 | 2021-11-19 | 青岛中瑞泰软控科技股份有限公司 | Screw pump injection-production integrated production device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109723412B (en) | Injection allocation device | |
| CN104632145B (en) | A kind of gas well draining plunger | |
| CN108952650A (en) | Mechanical strong enclosed flow string and oil extraction system | |
| CN207315332U (en) | Heavy oil wells note adopts pipe | |
| CN102410009A (en) | Controlled-valve placed well-cementing staged-fracturing well-completion string and hydraulically-controlled switch string | |
| CN207111067U (en) | Tandem type quantifies shear force separation gas anchor and the combination of multi-stage quantization gas anchor | |
| CN200943573Y (en) | Reciprocating type submersible electric pump oil extraction device | |
| CN203948282U (en) | A kind of gas-liquid displaced type gas prevention pump | |
| CN105569617B (en) | Switching regulator oil recovery water control device | |
| WO2016003890A1 (en) | Hydraulic lock compensating dummy valve | |
| CN105715234A (en) | Natural flowing mechanical production integrated pipe column | |
| CN207315289U (en) | Dual tubing heat extraction wellhead | |
| CN202300357U (en) | Well cementing staged fracturing well completion pipe column with controllable valves and hydraulic control switch pipe column | |
| CN105089583A (en) | Layered controllable oil production pipe column | |
| CN204283388U (en) | Horizontal well even steam injection tubing string | |
| CN2903473Y (en) | Reciprocating dual action oil-submersible electric pump | |
| CN207568505U (en) | Flow string | |
| CN208456567U (en) | A kind of concentric little oil pipe gas-lift working barrel and its airlift unit | |
| CN202325457U (en) | Naked eye segmented fracturing completion string for placement of controllable valves and liquid control switch string | |
| CN212428756U (en) | Thermal-insulated gas production tubular column cluster | |
| CN104389570A (en) | Uniform steam injection pipe column for horizontal well | |
| CN106593836B (en) | A kind of Multi-stage plunger displacement variable oil-well pump | |
| CN208473822U (en) | Steam distributing valve | |
| CN209212203U (en) | Underground metal packer | |
| CN208330321U (en) | steam distributing pipe column |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |