CN216866657U - Sand flushing and preventing integrated pipe column - Google Patents
Sand flushing and preventing integrated pipe column Download PDFInfo
- Publication number
- CN216866657U CN216866657U CN202220565187.XU CN202220565187U CN216866657U CN 216866657 U CN216866657 U CN 216866657U CN 202220565187 U CN202220565187 U CN 202220565187U CN 216866657 U CN216866657 U CN 216866657U
- Authority
- CN
- China
- Prior art keywords
- filling
- sand
- upper joint
- service
- steel ball
- 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
Images
Landscapes
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The utility model belongs to the technical field of oil well sand prevention devices, and discloses a sand washing and preventing integrated pipe column. The sand washing and preventing integrated pipe column comprises a filling part and a filling service part, wherein the filling part comprises an upper joint, a limiting cylinder and an action part, the upper joint is of a cylindrical structure, one end of the limiting cylinder is connected with one end of the upper joint, the action part is arranged in the limiting cylinder, the action part comprises a steel ball and an elastic part, the steel ball is arranged at one end of the elastic part and can be used for plugging a port of the upper joint, the other end of the elastic part is connected with the other end of the limiting cylinder, and a first filling port is formed in the limiting cylinder; the filling service piece is provided with a filling cavity, the filling service piece can be selectively arranged in the upper connector in a penetrating mode, a second filling port is formed in the wall of the filling cavity, and the filling service piece is configured to push the steel ball to move so that the first filling port is communicated with the second filling port. The sand washing and preventing integrated pipe column provided by the utility model has a simple structure, reduces the processing cost, and improves the construction success rate of a malignant sand production well and a rapid sand production well.
Description
Technical Field
The utility model relates to the technical field of oil well sand prevention devices, in particular to a sand washing and preventing integrated pipe column.
Background
Loose sandstone generally exists in Liaohe and Jidong oil areas, and the stratum is generally shallow, has small force ratio in the compaction process, is in a less-compacted state, has small cementation degree and is particularly easy to produce sand. Taking the Liaohe oil area as an example, the sand production wells of partial blocks can account for more than eighty percent of the total number of wells, the sand samples returned from the site have coarse sand, medium sand, fine sand, silt or mud, and the sorting coefficient is 1.87, which indicates that the sand production of the oil well is serious.
The movable reserves of the oil well can be seriously reduced by sand production, for example, the reserve control quantity is more than four hundred tons in a certain block of Liaohe, but the recoverable reserve is only more than seventy tons due to the sand production problem, and the reserve utilization is seriously limited. In order to deal with the sand production condition, mechanical sand control and chemical sand control can play a certain role, but when facing a rapid sand production well and a malignant sand production well, the existing tool is difficult to thoroughly solve the sand production problem, and the risk of sand burying a pipe column easily occurs.
In the prior art, in order to solve the sand control problem of a sand outlet well, sand control construction needs to be carried out, sand in the well needs to be washed clean firstly in the sand control construction, then a sand control pipe column is put in, so that two operations need to be carried out, time is seriously wasted, and the construction cost is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a sand washing and preventing integrated pipe column, which aims to simplify the structure, reduce the processing cost and improve the construction success rate of malignant sand production and rapid sand production wells.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a sand washing and preventing integrated pipe column comprises:
the filling part comprises an upper joint, a limiting cylinder and an action part, the upper joint is of a cylindrical structure, one end of the limiting cylinder is connected with one end of the upper joint, the action part is arranged in the limiting cylinder, the action part comprises a steel ball and an elastic part, the steel ball is arranged at one end of the elastic part, the steel ball can seal a port of the upper joint, the other end of the elastic part is connected with the other end of the limiting cylinder, and a first filling port is formed in the limiting cylinder;
the filling service piece can be selectively arranged in the upper joint in a penetrating mode, the filling service piece is provided with a filling cavity, a second filling port is arranged on the wall of the filling cavity, and the filling service piece is configured to push the steel ball to move so that the first filling port is communicated with the second filling port.
Optionally, one end of the upper joint is provided with a connecting piece, and the upper joint is connected with the limiting cylinder through the connecting piece.
Optionally, the connecting piece is of an annular structure, and a circular turning plate is arranged on the inner wall of the connecting piece.
Optionally, a torsion spring is arranged on the connecting piece, and the circular turning plate is connected with the connecting piece through the torsion spring.
Optionally, the upper joint is detachably connected with the connecting piece; and/or the connecting piece is detachably connected with the limiting cylinder.
Optionally, a steel ball seat is arranged on the connecting piece, a groove is arranged on the steel ball seat, and the shape of the groove corresponds to that of the steel ball.
Optionally, the filling service piece comprises:
the filling cavity is arranged on the service body;
the extrusion head is provided with one end of the service body, and the end part of the extrusion head is provided with an arc-shaped groove.
Optionally, the sand flushing and control integrated pipe string further comprises a sealing element, and the sealing element is used for sealing a gap between the filling service element and the filling element.
Optionally, the filling piece further comprises a guide head, and the guide head is sleeved at one end, far away from the upper joint, of the limiting cylinder.
Optionally, a base is arranged on the elastic member, and the steel ball is connected with the elastic member through the base.
The utility model has the beneficial effects that: the utility model provides a sand washing and preventing integrated pipe column, which is characterized in that a filling piece and a filling service piece are arranged, in the using process of the sand washing and preventing integrated pipe column, the filling service piece is firstly arranged in an upper joint in a penetrating mode, the filling service piece is pushed, the filling service piece pushes a steel ball to enable a first filling port and a second filling port to be communicated to form a filling channel, then the sand washing and preventing integrated pipe column is put into a well, in the putting-in process, when malignant sand is produced or rapid sand is produced, the filling service piece is pulled out, drilling fluid is pumped into the filling piece, the drilling fluid provides certain pressure for the steel ball, a port of the upper joint is opened, and a sand washing process is implemented until a sand producing section is not blocked; when the sand washing and preventing integrated pipe column is put in place, the filling service piece is installed in the upper joint again, filling sand liquid is pumped into the filling service piece, the filling sand liquid enters the filling service tool and is filled into an annular space between the sand washing and preventing integrated pipe column and a stratum through the second filling port and the first filling port in sequence to form a sand filling layer, after filling is completed, the filling service tool is taken out, and the steel ball plugs a port of the upper joint to complete the sand preventing process.
Drawings
FIG. 1 is a schematic structural diagram of a packing element provided in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a filling service part provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a flow path of drilling fluid in a sand washing process of the sand washing and prevention integrated pipe column provided by the embodiment of the utility model;
fig. 4 is a schematic diagram of a flow path of a sand filling fluid in a sand control process of the sand washing and control integrated pipe column provided by the embodiment of the utility model.
In the figure:
1. a filling member; 11. an upper joint; 12. a limiting cylinder; 121. a first fill port; 13. an actuation member; 131. a steel ball; 132. an elastic member; 14. leading; 15. a connecting member; 2. filling a service part; 21. a service ontology; 211. a first service cartridge; 212. a second service cartridge; 2121. a second filling port; 22. an extrusion head; 221. an arc-shaped slot; 3. a circular flap; 4. a torsion spring; 5. a steel ball seat; 6. a base; 7. a seal member; 71. a first seal member; 72. a second seal member; 73. a third seal member; 74. a fourth seal member; 8. an O-shaped ring; 9. a stop ring.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1 to 4, the present embodiment provides an integrated pipe string for sand washing and control. The sand washing and preventing integrated pipe column comprises a filling part 1 and a filling service part 2, wherein the filling part 1 comprises an upper joint 11, a limiting cylinder 12 and an action part 13, the upper joint 11 is of a cylindrical structure, one end of the limiting cylinder 12 is connected with one end of the upper joint 11, the action part 13 is arranged in the limiting cylinder 12, the action part 13 comprises a steel ball 131 and an elastic part 132, the steel ball 131 is arranged at one end of the elastic part 132, the steel ball 131 can seal a port of the upper joint 11, the other end of the elastic part 132 is connected with the other end of the limiting cylinder 12, and a first filling port 121 is formed in the limiting cylinder 12; the filling service member 2 has a filling cavity, the filling service member 2 can be selectively inserted into the upper joint 11, and a second filling port 2121 is arranged on the cavity wall of the filling cavity, and the filling service member 2 is configured to push the steel ball 131 to move so as to enable the first filling port 121 and the second filling port 2121 to communicate.
According to the sand washing and preventing integrated pipe column, the filling piece 1 and the filling service piece 2 are arranged, in the using process of the sand washing and preventing integrated pipe column, the filling service piece 2 is firstly arranged in the upper connector 11 in a penetrating mode, the filling service piece 2 is pushed, the filling service piece 2 pushes the steel ball 131, so that the first filling port 121 and the second filling port 2121 are communicated to form a filling channel, then the sand washing and preventing integrated pipe column is put into a well, in the putting-in process, when malignant sand production or rapid sand production occurs, the filling service piece 2 is pulled out, drilling fluid is pumped into the filling piece 1, the drilling fluid is provided for the steel ball 131 to have certain pressure, the port of the upper connector 11 is opened, and the sand washing process is carried out until the sand production section is not blocked any more; after the sand washing and preventing integrated pipe column is put in place, the filling service part 2 is installed in the upper joint 11 again, filling sand filling liquid is pumped into the filling service part 2 and enters a filling service tool, the filling sand filling liquid is filled into an annular space between the sand washing and preventing integrated pipe column and a stratum sequentially through the second filling port 2121 and the first filling port 121 to form a sand filling layer, after the filling is finished, the filling service tool is taken out, and the steel ball 131 seals and blocks a port of the upper joint 11, so that the sand preventing process is finished.
Optionally, one end of the upper joint 11 is provided with a connecting piece 15, and the upper joint 11 is connected with the limiting cylinder 12 through the connecting piece 15. Through setting up connecting piece 15, can prolong this length of dashing sand control integration tubular column, and then increase this lower degree of depth of going into of dashing sand control integration tubular column.
Furthermore, the connecting piece 15 is of an annular structure, and the inner wall of the connecting piece 15 is provided with a circular turning plate 3. Through setting up circular turning plate 3, when steel ball 131 fails to kick-back in order to carry out the shutoff to the port of top connection 11, circular turning plate 3 plays the effect of secondary isolation.
Optionally, the inner wall of the connecting member 15 is provided with a receiving groove, and after the filling service member 2 is inserted into the upper joint 11, the circular turning plate 3 rotates to enter the receiving groove. By the arrangement, the circular turnover plate 3 can be effectively prevented from blocking the filling service piece 2 from moving downwards.
Specifically, a torsion spring 4 is arranged on the connecting piece 15, and the circular turning plate 3 is connected with the connecting piece 15 through the torsion spring 4. The device is simple in structure, easy to install and low in processing cost.
In this embodiment, optionally, the upper joint 11 is detachably connected to the connecting member 15; and/or the connecting piece 15 is detachably connected with the limiting cylinder 12. The arrangement is convenient for disassembly and assembly.
Optionally, a sealing ring is provided between the upper joint 11 and the connecting piece 15. By the arrangement, the sealing performance of the upper joint 11 and the connecting piece 15 can be effectively improved.
Optionally, a steel ball seat 5 is provided on the connecting member 15, and a groove corresponding to the shape of the steel ball 131 is provided on the steel ball seat 5. By arranging the groove, the shape of the groove corresponds to that of the steel ball 131, so that the steel ball 131 can conveniently plug the port of the connecting piece 15, and the plugging is tighter.
Preferably, an O-ring 8 is provided between the steel ball seat 5 and the connecting member 15. By providing the O-ring 8, the O-ring 8 plays a role of metal sealing.
With continued reference to fig. 1, a base 6 is disposed on the elastic member 132, and the steel ball 131 is connected to the elastic member 132 through the base 6. By arranging the base 6, the reliability of connection between the steel ball 131 and the elastic member 132 can be effectively improved. In this embodiment, the base 6 includes four bottom blocks evenly arranged along the axial direction of the central shaft of the upper joint 11, the outer side of the bottom block is arc-shaped, and the bottom block is matched with the cavity wall of the filling cavity. In other embodiments, the number and shape of the bottom blocks can be set by those skilled in the art according to actual needs.
Optionally, the filling element 1 further includes a lead 14, and the lead 14 is sleeved on an end of the limiting cylinder 12 far away from the upper joint 11. Through setting up the lead 14, the lead 14 can guide packing element 1 along the movement of stratum degree of depth direction, has improved the efficiency that should wash sand control integration tubular column and go into.
Preferably, the lead 14 is removably connected to the restraining barrel 12. The arrangement is convenient for disassembly and assembly.
As shown in fig. 2, the filling service member 2 includes a service body 21 and an extrusion head 22, the filling cavity is disposed on the service body 21, the extrusion head 22 is disposed at one end of the service body 21, and an arc-shaped groove 221 is disposed at an end of the extrusion head 22. Through setting up arc-shaped groove 221, be convenient for promote steel ball 131, improve operating efficiency.
Optionally, the inner wall of the upper joint 11 is provided with an annular protrusion. After the filling service member 2 is inserted into the upper joint 11, the annular protrusion can effectively prevent the filling service member 2 from moving towards the guide head 14. This kind of setting has improved the use reliability of this towards sand control integration tubular column.
Preferably, the sand control integrated pipe string further comprises a sealing member 7, and the sealing member 7 is used for sealing a gap between the filling service member 2 and the filling member 1.
Specifically, the sealing member 7 includes a first sealing member 71, a second sealing member 72, a third sealing member 73, and a fourth sealing member 74, which are sequentially disposed, the first sealing member 71 being a female-type ring, the second sealing member 72 being a V-type washer, the third sealing member 73 being a V-type steel ring, and the fourth sealing member 74 being a male-type ring. When assembled, the first 71, second 72, third 73 and fourth 74 seals are assembled in combination as a sealed unit provided on the inner wall of the upper joint 11, effectively preventing sand particles from entering the outer assembly connected to the upper joint 11.
Optionally, the end of the sealing element 7 is provided with a blocking ring 9, and the other end of the blocking ring 9 abuts on the connecting element 15. Through setting up barrier ring 9, barrier ring 9 can prevent effectively that sealing member 7 from droing.
In this embodiment, the service body 21 is a cylindrical structure, the service body 21 includes a first service cylinder 211 and a second service cylinder 212 that are connected to each other, a filling cavity is formed by an inner cavity of the first service cylinder 211 and an inner cavity of the second service cylinder 212, an outer diameter of the first service cylinder 211 is larger than an outer diameter of the second service cylinder 212, an inner diameter of the annular protrusion is the same as the outer diameter of the second service cylinder 212, the extrusion head 22 is disposed at an end of the second service cylinder 212 away from the first service cylinder 211, and the second filling port 2121 is disposed on a cavity wall of the second service cylinder 212. This arrangement, which provides a sufficient seal between the filling service member 2 and the filling member 1, effectively prevents sand from entering the outer component connected to the upper fitting 11, and the annular projection effectively prevents movement of the filling service member 2 towards the lead 14.
The working process of the sand control integrated tubular column that this embodiment provided: assembling a filling part 1 on the ground, penetrating a filling service part 2 into the upper joint 11, pushing the filling service part 2, pushing the steel ball 131 by the filling service part 2 so as to enable the first filling port 121 and the second filling port 2121 to be communicated to form a filling channel, and connecting the sand washing and preventing integrated pipe column with other sand preventing filling pipes; when the sand is put into the well, in the process of putting into the well, when a sand layer section, malignant sand production or rapid sand production is met, the filling service part 2 is pulled out, drilling fluid is pumped into the filling part 1, the drilling fluid provides a certain pressure for the steel ball 131, so that the port of the upper joint 11 is opened, the sand washing process is implemented until the sand production section is not blocked, and the flow path of the drilling fluid in the sand washing process is shown in fig. 3; after the sand washing and preventing integrated pipe column is put in place, the filling service part 2 is installed in the upper joint 11 again, the filling sand liquid is pumped into the filling service part 2 and enters the filling service tool, the filling sand liquid is filled into an annular space between the sand washing and preventing integrated pipe column and a stratum sequentially through the second filling port 2121 and the first filling port 121 to form a sand filling layer, after the filling is completed, the filling service tool is taken out, the steel ball 131 seals and seals a port of the upper joint 11, and the sand preventing process is completed, for example, fig. 4 shows a flow path of the filling sand liquid in the sand preventing process.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the utility model. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a wash sand control integration tubular column which characterized in that includes:
the filling part (1), the filling part (1) comprises an upper joint (11), a limiting cylinder (12) and an action part (13), the upper joint (11) is of a cylindrical structure, one end of the limiting cylinder (12) is connected with one end of the upper joint (11), the action part (13) is arranged in the limiting cylinder (12), the action part (13) comprises a steel ball (131) and an elastic part (132), the steel ball (131) is arranged at one end of the elastic part (132), the steel ball (131) can block a port of the upper joint (11), the other end of the elastic part (132) is connected with the other end of the limiting cylinder (12), and a first filling port (121) is formed in the limiting cylinder (12);
the filling service piece (2) can be selectively arranged in the upper connector (11) in a penetrating mode, the filling service piece (2) is provided with a filling cavity, a second filling port (2121) is formed in the wall of the filling cavity, and the filling service piece (2) can push the steel ball (131) to move so that the first filling port (121) is communicated with the second filling port (2121).
2. The sand washing and preventing integrated pipe column as claimed in claim 1, wherein a connecting piece (15) is arranged at one end of the upper joint (11), and the upper joint (11) is connected with the limiting barrel (12) through the connecting piece (15).
3. The sand washing and preventing integrated pipe column according to claim 2, wherein the connecting piece (15) is of an annular structure, and a circular turnover plate (3) is arranged on the inner wall of the connecting piece (15).
4. The sand washing and preventing integrated pipe column according to claim 3, wherein a torsion spring (4) is arranged on the connecting piece (15), and the circular turning plate (3) is connected with the connecting piece (15) through the torsion spring (4).
5. The sand washing and preventing integrated pipe column as claimed in claim 2, wherein the upper joint (11) is detachably connected with the connecting piece (15); and/or the connecting piece (15) is detachably connected with the limiting cylinder (12).
6. The sand washing and prevention integrated pipe column as claimed in claim 2, wherein a steel ball seat (5) is arranged on the connecting piece (15), a groove is arranged on the steel ball seat (5), and the shape of the groove corresponds to that of the steel ball (131).
7. The integrated pipe string for sand control according to claim 1, wherein the packing service member (2) comprises:
the service body (21), the said filling cavity locates on the said service body (21);
the extrusion head (22), extrusion head (22) are located the one end of service body (21), the tip of extrusion head (22) is equipped with arc groove (221).
8. The integrated flushing and sand control pipe string as claimed in any one of claims 1 to 7, further comprising a sealing member (7), wherein the sealing member (7) is used for sealing a gap between the filling service member (2) and the filling member (1).
9. The integrated pipe column for sand washing and preventing according to any one of claims 1 to 7, characterized in that the packing element (1) further comprises a leading head (14), and the leading head (14) is sleeved at one end of the limiting cylinder (12) far away from the upper joint (11).
10. The integrated pipe column for sand washing and prevention according to any one of claims 1 to 7, wherein a base (6) is arranged on the elastic member (132), and the steel ball (131) is connected with the elastic member (132) through the base (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220565187.XU CN216866657U (en) | 2022-03-15 | 2022-03-15 | Sand flushing and preventing integrated pipe column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220565187.XU CN216866657U (en) | 2022-03-15 | 2022-03-15 | Sand flushing and preventing integrated pipe column |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216866657U true CN216866657U (en) | 2022-07-01 |
Family
ID=82124107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220565187.XU Active CN216866657U (en) | 2022-03-15 | 2022-03-15 | Sand flushing and preventing integrated pipe column |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216866657U (en) |
-
2022
- 2022-03-15 CN CN202220565187.XU patent/CN216866657U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203081411U (en) | Anti-corrosion anti-scale and gas lift integrated well completion pipe string | |
| CN104389554B (en) | Underground pressure control circulating switch valve | |
| CN201679497U (en) | Ice blocking type pressure-maintaining and heat-preservation sampler | |
| CN101684724A (en) | Snubbing downhole control valve | |
| CN116335579B (en) | Oil field well casing packer and non-cementing injection self-plugging staged fracturing method | |
| CN103573214B (en) | A kind of Operating Pressure circulation bottom valve | |
| CN108625784B (en) | Hydraulic pressurizing jet drilling tool | |
| CN216866657U (en) | Sand flushing and preventing integrated pipe column | |
| CN114635668A (en) | Tool and method for safely punching and scraping oil pipe | |
| CN207453907U (en) | The closed continuous sand flushing control device of well head | |
| CN206830131U (en) | Sand setting constant pressure check valve for water injection well | |
| CN113153249A (en) | Eccentric water distributor | |
| CN208982015U (en) | A kind of well-flushing oil drain switch | |
| CN218816323U (en) | Dual-purpose packer for underground fracturing and water injection | |
| CN216950317U (en) | Piston type multi-activation bypass valve | |
| CN111706313B (en) | Pressure relief protector for deep water oil gas test retention valve | |
| CN1936267B (en) | Pressure-controlled bridging system | |
| CN201137484Y (en) | Anti-pollution eccentric water distributing apparatus | |
| CN204511376U (en) | Permanent type plug control sand blast sliding sleeve and fracturing string | |
| CN108678710B (en) | Use method of acid salt scale prevention and removal device for water injection well | |
| CN112392438A (en) | Closed oil production pipe column structure capable of washing well and adding chemicals | |
| CN202228043U (en) | Safety valve in pipes | |
| CN111350476A (en) | Jet flow crushing, sucking and recovering device suitable for natural gas hydrate exploitation | |
| CN111441752B (en) | Multilayer polymer injection well washing method for coiled tubing | |
| CN216142737U (en) | Sectional filling tool for sidetracking horizontal well |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |