CN104153734A - Hydraulic pressure type coring tool - Google Patents
Hydraulic pressure type coring tool Download PDFInfo
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- CN104153734A CN104153734A CN201410427660.8A CN201410427660A CN104153734A CN 104153734 A CN104153734 A CN 104153734A CN 201410427660 A CN201410427660 A CN 201410427660A CN 104153734 A CN104153734 A CN 104153734A
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- surges
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- pressurized
- coring tool
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Abstract
The invention discloses a hydraulic pressure type coring tool which comprises a safe joint, a hydraulic pressurizing device, an outer cylinder assembly, an inner cylinder assembly and a core catcher assembly. The safe joint is of a big-end-up cone shape, the bottom and the top of the safe joint are opened, the middle of the safe joint is connected with the outer cylinder assembly through threads, the lower portion of the safe joint is connected with the hydraulic pressurizing device through threads, the inner cylinder assembly is hung below the hydraulic pressurizing device through a hanging device, the core catcher assembly is arranged on the lower side of the inner cylinder assembly, and the hydraulic pressurizing device, the inner cylinder assembly and the core catcher assembly are located in the outer cylinder assembly. After the hydraulic pressurizing device exerts hydraulic pressure, the hanging device falls off, the inner cylinder assembly and the core catcher assembly fall along with the hanging device, and the core catcher assembly clamps under the action of hydraulic pressure to achieve the aim of completely wrapping a smashing core. When plastic deformation of a core sealing sleeve reaches a certain degree, drilling fluid is discharged from a gap between the core sealing sleeve and a connection sleeve, so that the core can not be compressed excessively, and integrity of the core is guaranteed.
Description
Technical field
The invention belongs to drilling and coring delivery field, be specifically related to a kind of pressurized coring tool that surges.
Background technology
In the coring operation of soft, broken formation, mainly there is a following difficult problem: the low rock core that causes of formation cementation thing intensity is difficult for being shaped, is difficult to enter coring tool.When rock core cement has stronger water sensitivity, under water-base drilling fluid erosion rock core supporting capacity reduce, the fragmentation of easily caving in, cause the generation of the stifled heart, mill heart phenomenon, thereby affect CORING TECHNOLOGY index.At cementing loose, heterogeneity conglomeratic sand conglomerate, core in process, core bit and instrument vibration easily cause rock core fracture, fragmentation.Going out in a process of rock core, because rock core post stress changes, the rock core fragmentation of easily caving in, has reduced the sampling scope of rock core geological analysis, has reduced the accuracy of geologic information.Due to the existence of these difficult problems, make that coring operation difficulty at soft, broken formation is large, core recovery is lower.The coring tool using in coring operation for soft, broken formation in prior art is still comparatively backward, and average core recovery is extremely low, for geological prospecting, causes adverse effect.Therefore, in the urgent need to researching and developing a kind of coring tool soft, broken formation that adapts to, to meet field demand.
Summary of the invention
It is a kind of simple in structure, easy to use that the object of the invention is to provide, and can effectively improve the pressurized coring tool that surges soft, broken formation core recovery.
For realizing above-mentioned technical purpose, use technical scheme:
A kind of pressurized coring tool that surges, comprise safety joint, the water booster system that surges, outer barrel component, interior cartridge module and core grabber assembly, wherein safety joint is bottom and the up big and down small taper shape of top hollow, and safety joint middle part is threaded with outer barrel component, bottom is threaded with the water booster system that surges; Interior cartridge module hangs on by suspension arrangement the water booster system below of surging, and core grabber assembly is arranged at interior cartridge module below; Surge water booster system, interior cartridge module and core grabber assembly is positioned at outer barrel component.The water booster system that surges applies after hydraulic pressure, and suspension arrangement comes off, and interior cartridge module declines with suspension arrangement with core grabber assembly, and core grabber assembly clamps under the effect of hydraulic pressure, realizes the object that broken rock core is wrapped up completely.
For making the present invention more be suitable for practicality, make further improvements below:
The described water booster system that surges comprises axle and sealed ball seat, and axle sidewall medium position is provided with at least one relief hole, and relief hole below is provided with at least one putting hole; Sealed ball seat is arranged at axle inner side by pin, by relief hole and putting hole sealing.When needs pressurize, from safety joint, inwardly drop into pressurization steel ball, after axle, fall into sealed ball seat, add pressing steel balls and sealed ball seat and form sealing, sealed ball seat is cut short pin under hydraulic action, and sealed ball seat declines under self gravitation effect, exposes relief hole and putting hole.
Described relief hole is set to four.
Described putting hole is set to two.
Described suspension arrangement comprises suspension steel ball, inner core connector, single current valve seat and sealed steel ball, inner core connector bottom is connected with interior cartridge module, inner core connector inside sidewalls face is provided with and hangs steel ball groove one to one, hang steel ball corresponding one by one with putting hole, suspension steel ball half be positioned at putting hole, half is positioned at groove; On inner core connector sidewall, be also provided with at least one circulation port, circulation port is positioned at sealed ball seat below; Single current valve seat is arranged at inner core connector bottom, and sealed steel ball is arranged at single current valve seat top, forms ball-and-seat.
Described circulation port is set to four.
Described relief hole and circulation port are downward-sloping from inside to outside, to prevent that drilling fluid from blowing back into inner core.
Described core grabber assembly comprises adapter sleeve, rock core sealing shroud, clip and clip seat, and adapter sleeve sidewall is provided with at least two in the symmetrical hole of exerting pressure of same cross section, and rock core sealing shroud is arranged at adapter sleeve inner side, the hole sealing of exerting pressure; Adapter sleeve sidewall lateral surface, the below, hole of exerting pressure are provided with annular protrusion one; Clip seat is arranged at adapter sleeve below, and clip is arranged in clip seat.
For convenience of describing, do following abbreviation: suspension arrangement comes off, interior cartridge module declines with suspension arrangement with core grabber assembly, and the distance of its decline is referred to as dropping distance.The width of the convex top of annular protrusion one is protruding one wide, and the width of the convex top of annular protrusion two is protruding two wide, and the vertical distance between the convex top mid point of annular protrusion one and the convex top mid point of annular protrusion two is protruding middle distance.
Described outer barrel component comprises urceolus, Pressurized short joint and protection pipe nipple, and Pressurized short joint is arranged at urceolus below and is positioned at adapter sleeve outside, and protection pipe nipple is arranged at Pressurized short joint below and is positioned at clip seat outside, and Pressurized short joint inside sidewalls face is provided with annular protrusion two; Annular protrusion two is positioned at annular protrusion one below, its convex top is in contact with one another the annular space space between cartridge module and outer barrel component in rear sealing, protruding middle distance be greater than dropping distance deduct 1/2nd protruding one wide deduct again 1/2nd protruding two wide, be less than dropping distance add 1/2nd protruding one wide add 1/2nd protruding two wide.
Described outer barrel component also comprises difference pipe nipple, and difference pipe nipple is arranged at above or below urceolus, for regulating outer barrel component entire length.
Described protruding middle distance equals dropping distance.
Beneficial effect of the present invention is: can rationally utilize the hydraulic coupling of drilling fluid to realize the object that broken rock core is wrapped up completely.In drilling and coring delivery process, drilling fluid flows into the annular space part between inner/outer tube from circulation port from axle and sealed ball seat are flowed through in safety joint, finally by bit port, flows out, and realizes the object of shaft bottom landwaste being taken back to ground.Drilling and coring delivery finishes rear input and adds pressing steel balls, adds pressing steel balls and fall into sealed ball seat after safety joint and axle, and making that drilling fluid runner is sealed cannot pressure release, thereby applies hydraulic coupling to adding pressing steel balls.Add pressing steel balls hydraulic coupling is passed to sealed ball seat, cause sealed ball seat under the effect of hydraulic coupling, cut off pin and decline, and then expose relief hole and putting hole.Drilling fluid flows out from relief hole, and the suspension steel ball in putting hole loses the support from sealed ball seat, causes hanging steel ball and inwardly rolls, thereby suspension arrangement is come off, and after suspension arrangement comes off, interior cartridge module declines with suspension arrangement with core grabber assembly.After decline, make the convex top of annular protrusion one and annular protrusion two be in contact with one another, thus the annular space space between the interior cartridge module of sealing and outer barrel component.Drilling fluid, from relief hole flows out, because the annular space space between interior cartridge module and outer barrel component is sealed, makes the hydraulic coupling of drilling fluid exert pressure to rock core sealing shroud from the hole of exerting pressure, and causes rock core sealing shroud that strong plastic deformation occurs.When rock core sealing shroud plastic strain simultaneously acquires a certain degree, drilling fluid is released from rock core sealing shroud and adapter sleeve gap, makes rock core can not be subject to excess compression, protects the integrality of positive rock core.Finally realize the object that rock core sealing shroud wraps up completely to broken rock core.Unexpectedly guaranteed in core recovery soft, broken formation.
Accompanying drawing explanation
Fig. 1 is the structural representation in drilling and coring delivery process of the present invention.
Fig. 2 is the A-A generalized section of Fig. 1.
Fig. 3 is the B part enlarged diagram of Fig. 1.
Fig. 4 is the C part enlarged diagram of Fig. 1.
Fig. 5 is the structural representation after drilling and coring delivery of the present invention finishes.
Fig. 6 is the F-F generalized section of Fig. 5.
Fig. 7 is the D part enlarged diagram of Fig. 5.
Fig. 8 is the E part enlarged diagram of Fig. 5.
Fig. 9 is water booster system and the suspension arrangement structural representation of surging.
Figure 10 is the F-F generalized section of Fig. 9.
Figure 11 is core grabber modular construction schematic diagram.
Figure 12 is the G-G generalized section of Figure 11.
In accompanying drawing: 1-safety joint, 21-axle, 22-pin, 23-sealed ball seat, 24-relief hole; 25-adds pressing steel balls, 31-inner core connector, and 32-hangs steel ball, 33-circulation port; 34-sealed steel ball, 35-single current valve seat, 36-groove, 37-putting hole; 41-urceolus, 42-Pressurized short joint, 43-annular protrusion two, 44-protects pipe nipple; 45-difference pipe nipple, cartridge module in 5-, 61-adapter sleeve, 62-rock core sealing shroud; 63-annular protrusion one, the 64-hole of exerting pressure, 65-clip seat, 66-clip.
The specific embodiment
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, a kind of pressurized coring tool that surges, comprise safety joint 1, the water booster system that surges, outer barrel component, interior cartridge module 5 and core grabber assembly, wherein safety joint 1 is bottom and the up big and down small taper shape of top hollow, and safety joint 1 middle part is threaded with outer barrel component, bottom is threaded with the water booster system that surges; Interior cartridge module 5 hangs on by suspension arrangement the water booster system below of surging, and core grabber assembly is arranged at interior cartridge module 5 belows; Surge water booster system, interior cartridge module 5 and core grabber assembly is positioned at outer barrel component.The water booster system that surges applies after hydraulic pressure, and suspension arrangement comes off, and interior cartridge module 5 declines with suspension arrangement with core grabber assembly, and core grabber assembly clamps under the effect of hydraulic pressure, realizes the object that broken rock core is wrapped up completely.As shown in Fig. 9, Fig. 3, Fig. 5, Fig. 6, Fig. 7 and Figure 10, the water booster system that surges comprises axle 21 and sealed ball seat 23, and axle 21 sidewall medium positions are provided with at least one relief hole 24, and relief hole 24 belows are provided with at least one putting hole 37; Sealed ball seat 23 is arranged at axle 21 inner sides by pin 22, by relief hole 24 and putting hole 37 sealings.When needs pressurize, from safety joint 1, inwardly drop into pressurization steel ball 25, after axle 21, fall into sealed ball seat 23, add pressing steel balls 25 and form sealing with sealed ball seat 23, sealed ball seat 23 is cut short pin 22 under hydraulic action, sealed ball seat 23 declines under self gravitation effect, exposes relief hole 24 and putting hole 37.Suspension arrangement comprises suspension steel ball 32, inner core connector 31, single current valve seat 35 and sealed steel ball 34, inner core connector 31 bottoms are connected with interior cartridge module 5, inner core connector 31 inside sidewalls faces are provided with and hang steel ball 32 groove 36 one to one, hang steel ball 32 corresponding one by one with putting hole 37, suspension steel ball 32 half be positioned at putting hole 37, half is positioned at groove 36; On inner core connector 31 sidewalls, be also provided with at least one circulation port 33, circulation port 33 is positioned at sealed ball seat 23 belows; Single current valve seat 35 is arranged at inner core connector 31 bottoms, and sealed steel ball 34 is arranged at single current valve seat 35 tops, forms ball-and-seat.As shown in Figure 11, Figure 12, Fig. 4 and Fig. 8, core grabber assembly comprises adapter sleeve 61, rock core sealing shroud 62, clip 66 and clip seat 65, adapter sleeve 61 sidewalls are provided with at least two in the symmetrical hole 64 of exerting pressure of same cross section, rock core sealing shroud 62 is arranged at adapter sleeve 61 inner sides, hole 64 sealings of exerting pressure; Adapter sleeve 61 sidewall lateral surfaces, 64 belows, hole of exerting pressure are provided with annular protrusion 1; Clip seat 65 is arranged at adapter sleeve 61 belows, and clip 66 is arranged in clip seat 65.As shown in Figure 1, Figure 2, Figure 3 and Figure 4, outer barrel component comprises urceolus 41, Pressurized short joint 42 and protection pipe nipple 44, Pressurized short joint 42 is arranged at urceolus 41 belows and is positioned at adapter sleeve 61 outsides, protection pipe nipple 44 is arranged at Pressurized short joint 42 belows and is positioned at clip seat 65 outsides, and Pressurized short joint 42 inside sidewalls faces are provided with annular protrusion 2 43; Annular protrusion 2 43 is positioned at annular protrusion one 63 belows, its convex top is in contact with one another the annular space space between cartridge module 5 and outer barrel component in rear sealing, protruding middle distance be greater than dropping distance deduct 1/2nd protruding one wide deduct again 1/2nd protruding two wide, be less than dropping distance add 1/2nd protruding one wide add 1/2nd protruding two wide.Relief hole 24 is set to four.Putting hole 37 is set to two.Circulation port 33 is set to four.Relief hole 24 and circulation port 33 are downward-sloping from inside to outside, to prevent that drilling fluid from blowing back into inner core.Outer barrel component also comprises difference pipe nipple 45, and difference pipe nipple 45 is arranged at above or below urceolus 41, for regulating outer barrel component entire length.Protruding middle distance equals dropping distance.
The present invention is in the course of the work: in drilling and coring delivery process, the annular space part that drilling fluid flows between inner/outer tube 41 from circulation port 33 from axle 21 and sealed ball seat 23 are flowed through in safety joint 1, finally by bit port, flow out, realize the object of shaft bottom landwaste being taken back to ground.After drilling and coring delivery finishes, drop into and to add pressing steel balls 25, add pressing steel balls 25 and fall into sealed ball seat 23 after safety joint 1 and axle 21, making that drilling fluid runner is sealed cannot pressure release, thereby applies hydraulic coupling to adding pressing steel balls 25.Add pressing steel balls 25 hydraulic coupling is passed to sealed ball seat 23, cause sealed ball seat 23 under the effect of hydraulic coupling, cut off pin 22 and decline, and then expose relief hole 24 and putting hole 37.Drilling fluid flows out from relief hole 24, suspension steel ball 32 in putting hole 37 loses the support from sealed ball seat 23, causing hanging steel ball 32 inwardly rolls, thereby suspension arrangement is come off, during the water booster system that surges pressurization, suspension arrangement comes off, and interior cartridge module 5 declines with suspension arrangement with core grabber assembly.After decline, make the convex top of annular protrusion 1 and annular protrusion 2 43 be in contact with one another, thus the annular space space between the interior cartridge module 5 of sealing and outer barrel component.Drilling fluid, from relief hole 24 flows out, because the annular space space between interior cartridge module 5 and outer barrel component is sealed, makes the hydraulic coupling of drilling fluid exert pressure from 64 pairs, the hole rock core sealing shroud 62 of exerting pressure, and causes rock core sealing shroud 62 that strong plastic deformation occurs.When rock core sealing shroud 62 plastic strain simultaneously acquire a certain degree, drilling fluid is released through ball-and-seat from rock core sealing shroud 62 and adapter sleeve 61 gaps, makes rock core can not be subject to excess compression, protects the integrality of positive rock core.Finally realize the object that 62 pairs of broken rock cores of rock core sealing shroud wrap up completely.Unexpectedly guaranteed in core recovery soft, broken formation.
Claims (10)
1. the pressurized coring tool that surges, it is characterized in that: comprise safety joint (1), the water booster system that surges, outer barrel component, interior cartridge module (5) and core grabber assembly, wherein safety joint (1) is bottom and the up big and down small taper shape of top hollow, safety joint (1) middle part is threaded with outer barrel component, bottom is threaded with the water booster system that surges, interior cartridge module (5) hangs on by suspension arrangement the water booster system below of surging, core grabber assembly is arranged at interior cartridge module (5) below, and the water booster system that surges, interior cartridge module (5) and core grabber assembly are positioned at outer barrel component.
2. pressurized coring tool as claimed in claim 1 surges, it is characterized in that: described in the water booster system that surges comprise axle (21) and sealed ball seat (23), axle (21) sidewall medium position is provided with at least one relief hole (24), and relief hole (24) below is provided with at least one putting hole (37); Sealed ball seat (23) is arranged at axle (21) inner side by pin (22), by relief hole (24) and putting hole (37) sealing; Sealed ball seat (23) top is provided with and adds pressing steel balls (25), add pressing steel balls (25) and form sealing with sealed ball seat (23), sealed ball seat (23) is cut off pin (22), and sealed ball seat (23) declines and exposes relief hole (24) and putting hole (37).
3. pressurized coring tool as claimed in claim 1 surges, it is characterized in that: described suspension arrangement comprises suspension steel ball (32), inner core connector (31), single current valve seat (35) and sealed steel ball (34), inner core connector (31) bottom is connected with interior cartridge module (5), inner core connector (31) inside sidewalls face is provided with and hangs steel ball (32) groove (36) one to one, hang steel ball (32) corresponding one by one with putting hole (37), suspension steel ball (32) part is positioned at putting hole (37), a part is positioned at groove (36); On inner core connector (31) sidewall, be also provided with at least one circulation port (33), circulation port (33) is positioned at sealed ball seat (23) below; Single current valve seat (35) is arranged at inner core connector (31) bottom, and sealed steel ball (34) is arranged at single current valve seat (35) top, forms ball-and-seat.
4. pressurized coring tool as claimed in claim 1 surges, it is characterized in that: described core grabber assembly comprises adapter sleeve (61), rock core sealing shroud (62), clip (66) and clip seat (65), adapter sleeve (61) sidewall is provided with at least two in the symmetrical hole of exerting pressure (64) of same cross section, rock core sealing shroud (62) is arranged at adapter sleeve (61) inner side, hole (64) sealing of exerting pressure; Adapter sleeve (61) sidewall lateral surface, the hole of exerting pressure (64) below are provided with annular protrusion one (63); Clip seat (65) is arranged at adapter sleeve (61) below, and clip (66) is arranged in clip seat (65).
5. pressurized coring tool as claimed in claim 4 surges, it is characterized in that: described outer barrel component comprises urceolus (41), Pressurized short joint (42) and protection pipe nipple (44), Pressurized short joint (42) is arranged at urceolus (41) below and is positioned at adapter sleeve (61) outside, protection pipe nipple (44) is arranged at Pressurized short joint (42) below and is positioned at clip seat (65) outside, and Pressurized short joint (42) inside sidewalls face is provided with annular protrusion two (43); Annular protrusion two (43) is positioned at annular protrusion one (63) below, and the convex top of annular protrusion two (43) and annular protrusion one (63) is in contact with one another the annular space space between the interior cartridge module (5) of rear sealing and outer barrel component.
6. the pressurized coring tool that surges as described in as arbitrary in claim 1-5, is characterized in that: described relief hole (24) is set to 2-5 with circulation port (33).
7. the pressurized coring tool that surges as described in as arbitrary in claim 1-5, is characterized in that: described putting hole (37) is set to 2-5.
8. the pressurized coring tool that surges as described in as arbitrary in claim 1-5, is characterized in that: described relief hole (24) and circulation port (33) are downward-sloping from inside to outside.
9. be applied to as claimed in claim 5 the to surge rock core sealing device of pressurized coring tool, is characterized in that: protruding middle distance be greater than dropping distance deduct 1/2nd protruding one wide deduct again 1/2nd protruding two wide, be less than dropping distance add 1/2nd protruding one wide add 1/2nd protruding two wide.
10. the pressurized coring tool that surges as described in as arbitrary in claim 9, is characterized in that: described protruding middle distance equals dropping distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410427660.8A CN104153734B (en) | 2014-08-27 | 2014-08-27 | Hydraulic pressure type coring tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410427660.8A CN104153734B (en) | 2014-08-27 | 2014-08-27 | Hydraulic pressure type coring tool |
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| CN104153734A true CN104153734A (en) | 2014-11-19 |
| CN104153734B CN104153734B (en) | 2017-01-25 |
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| CN201410427660.8A Active CN104153734B (en) | 2014-08-27 | 2014-08-27 | Hydraulic pressure type coring tool |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105672923A (en) * | 2015-12-16 | 2016-06-15 | 中国地质科学院勘探技术研究所 | Single-action assembly capable of preventing inner tube assembly from falling off |
| CN108952610A (en) * | 2018-09-10 | 2018-12-07 | 长江大学 | A kind of hydraulic-driven coring tool for Holes of Complicated Wells |
| CN109869106A (en) * | 2018-08-13 | 2019-06-11 | 四川大学 | A kind of core drilling rig ends automatically mechanism |
| CN110273659A (en) * | 2019-06-28 | 2019-09-24 | 中国石油集团长城钻探工程有限公司 | A kind of self-priming confining pressure protection coring inner drum and application method |
| WO2020034353A1 (en) * | 2018-08-13 | 2020-02-20 | 四川大学 | Sealing structure with explosion-proof function for upper part of pressure maintaining barrel |
| WO2020034366A1 (en) * | 2018-08-13 | 2020-02-20 | 四川大学 | Automatic starting mechanism for core drilling rig |
| CN112324375A (en) * | 2021-01-04 | 2021-02-05 | 成都理工大学 | Pressurized coring system and method |
| CN116065996A (en) * | 2022-08-02 | 2023-05-05 | 中国石油天然气集团有限公司 | Pressure-control coring tool and method for ultra-deep well |
| CN116065996B (en) * | 2022-08-02 | 2024-04-26 | 中国石油天然气集团有限公司 | Pressure-control coring tool and method for ultra-deep well |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109869106A (en) * | 2018-08-13 | 2019-06-11 | 四川大学 | A kind of core drilling rig ends automatically mechanism |
| WO2020034353A1 (en) * | 2018-08-13 | 2020-02-20 | 四川大学 | Sealing structure with explosion-proof function for upper part of pressure maintaining barrel |
| WO2020034366A1 (en) * | 2018-08-13 | 2020-02-20 | 四川大学 | Automatic starting mechanism for core drilling rig |
| CN109869106B (en) * | 2018-08-13 | 2023-12-19 | 四川大学 | Automatic end mechanism of core drilling machine |
| CN108952610A (en) * | 2018-09-10 | 2018-12-07 | 长江大学 | A kind of hydraulic-driven coring tool for Holes of Complicated Wells |
| CN110273659A (en) * | 2019-06-28 | 2019-09-24 | 中国石油集团长城钻探工程有限公司 | A kind of self-priming confining pressure protection coring inner drum and application method |
| CN110273659B (en) * | 2019-06-28 | 2021-08-31 | 中国石油天然气集团有限公司 | Self-suction confining pressure protection coring inner barrel and application method |
| CN112324375A (en) * | 2021-01-04 | 2021-02-05 | 成都理工大学 | Pressurized coring system and method |
| CN116065996A (en) * | 2022-08-02 | 2023-05-05 | 中国石油天然气集团有限公司 | Pressure-control coring tool and method for ultra-deep well |
| CN116065996B (en) * | 2022-08-02 | 2024-04-26 | 中国石油天然气集团有限公司 | Pressure-control coring tool and method for ultra-deep well |
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Inventor after: Li Weicheng Inventor after: Chen Xiaobin Inventor after: Chen Li Inventor after: Yao Jianlin Inventor after: Liu Bin Inventor after: He Chao Inventor after: Hu Pan Inventor after: Tang Cong Inventor after: Chen Wencai Inventor before: Hu Pan Inventor before: Liu Bin Inventor before: He Chao Inventor before: Li Weicheng |
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