CN102493785A - Automatic control sleeve valve - Google Patents
Automatic control sleeve valve Download PDFInfo
- Publication number
- CN102493785A CN102493785A CN201110395038XA CN201110395038A CN102493785A CN 102493785 A CN102493785 A CN 102493785A CN 201110395038X A CN201110395038X A CN 201110395038XA CN 201110395038 A CN201110395038 A CN 201110395038A CN 102493785 A CN102493785 A CN 102493785A
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- Prior art keywords
- valve
- casing
- eccentric
- sealing
- automatic control
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- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 230000005284 excitation Effects 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 27
- 210000002445 nipple Anatomy 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 10
- 239000002828 fuel tank Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 239000000696 magnetic material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 14
- 239000003208 petroleum Substances 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000017105 transposition Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
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- Magnetically Actuated Valves (AREA)
Abstract
The invention relates to the technical field of underbalanced drilling in petroleum engineering, in particular to an automatic control casing valve. The casing valve consists of a non-magnetic casing short-circuit assembly and a casing valve main body assembly, wherein a piston cylinder is arranged in an eccentric outer cylinder of the casing valve main body assembly, the lower end of the eccentric outer cylinder is connected with a valve seat through a lacing wire and a lacing wire bolt, the valve seat fastens a rib plate through a rib plate bolt, a shaft pin connects the rib plate and a torsion spring in series with a valve plate, an electronic device cavity and a hydraulic driving cavity are respectively arranged outside the thick pipe wall of the eccentric outer cylinder, a pressure sensor is installed at the lower end of the valve seat, an axial line passing channel is arranged between the pressure sensor and the electronic device cavity, a permanent locking mechanism is arranged on one side of the lower end part of the valve seat, and the non-magnetic casing short-circuit assembly comprises an excitation coil. The invention realizes simple and convenient installation and operation. The defects that the existing casing valve is troublesome to install and operate in the well and the oil pipeline is easy to deform are overcome.
Description
Technical field:
The present invention relates to a kind of petroleum works under-balanced drilling technology field, particularly a kind of automatic control casing valve.
Background technology:
The employed casing valve of under balance pressure drilling is divided into down hole sleeve valve and ground hydraulic control system two large divisions basically at present, and wherein the ground hydraulic control system mainly comprises hydraulic control cabinet and hydraulic tube cable dish.Two hydraulic fluid pipelines of the hydraulic control cabinet on ground link to each other with the down-hole casing valve body through hydraulic tube cable dish; When needs carried out the casing valve switching manipulation, operating personnel can make down hole sleeve valve do corresponding switching manipulation through the phase-change switch of controlling the hydraulic control cabinet.Because the existence of hydraulic tube cable dish bothers existing casing valve execute-in-place very much, and the long oil pipeline of nearly km is easy to deform in the install operation process of going into the well, and has hidden danger such as obstruction or fracture, makes drillng operation in the future have risk.
Summary of the invention:
The technical problem that the present invention will solve provides a kind of automatic control casing valve, and this casing valve has only the down-hole part, does not have above ground portion and any cable that is connected, and has realized that fitting operation is easy, makes drillng operation safe and reliable.Overcome the deficiency that existing casing valve is gone into the well the fitting operation trouble and is prone to deform with oil pipeline.
The technical scheme that the present invention taked is: a kind of automatic control casing valve, and this casing valve is made up of no magnetosheath pipe short circuit assembly and casing valve main body assembly, and no magnetosheath pipe short circuit assembly is arranged on the casing valve main body assembly and through protective casing and is connected with cable; The casing valve main body assembly comprises casing joint pipe nipple, eccentric urceolus, branch sleeve and lower eccentric joint; The order screwed connection from top to bottom of casing joint pipe nipple, eccentric urceolus, branch sleeve, lower eccentric joint; Be provided with piston cylinder in the eccentric urceolus; Eccentric urceolus lower end is connected valve seat through lacing wire with the lacing wire bolt; Valve seat is through gusset bolton gusset; Pivot pin is serially connected gusset and torsion spring and valve plate, is in normal off status at the effect lower valve plate of torsion spring, and the lower eccentric upper end of joint is provided with the stop pin assembly; The thick tube wall outside of eccentric urceolus is provided with electronic device chamber and hydraulic-driven chamber respectively; The chamber outside all is provided with the fastening chamber cover plate of cover plate bolt, and electronics pocket is indoor mainly to be provided with singlechip computer system, motor-drive circuit, reversal valve drive circuit, displacement transducer, forever open drive circuit and lithium battery group, mainly is provided with the ON operation hydraulic line in the hydraulic-driven chamber, closes and operate hydraulic line, two-position four-way solenoid operated directional valve, motor reducer, overflow valve, hydraulic pump and fuel tank; Lower end at valve seat is equipped with pressure sensor; Between pressure sensor and electronic device chamber, have axial passing channel, one side is provided with permanent locking mechanism in the valve seat bottom, this permanent locking mechanism comprises the electromagnetic valve assembly, do not sell spring, not Xiao, stop pin spring and Permanent lock rationed marketing; No magnetosheath pipe short circuit assembly comprises excitation coil circuit, magnetic test coil circuit, no magnetosheath pipe pipe nipple and antenna receiving-sending circuit.
The magnetizing coil of no magnetosheath pipe short circuit assembly and magnetic test coil around inner tube material adopt no magnetic material.
The distance of separating between no magnetosheath pipe short circuit assembly and the casing valve main body assembly is 10 meters.
Locate through the sleeve positioning bolt between branch sleeve and the lower eccentric joint.
Passing channel was provided with linear sealing cover and sealing shroud sealing between valve seat and eccentric urceolus.
Casing joint pipe nipple lower outside is provided with the casing joint sealing, and the outside, piston cylinder upper end and the outside, middle part are provided with sealing and piston lower seal on the piston respectively.
Eccentric urceolus lower end is inboard to be provided with sealing and eccentric tube external seal in the eccentric tube respectively with the outside, and the valve seat outside is provided with valve base sealing.
Lower eccentric joint upper outside is provided with the lower eccentric joint sealing, and the chamber cover plate is provided with cover plate for sealing.
The upper surface of eccentric urceolus is provided with cable connector.
The invention has the beneficial effects as follows: the present invention is owing to have only the down-hole part; There are not above ground portion and any cable that is connected; Thereby fundamentally solved casing valve and go into the well that distortion causes the risk problem of fault to the fitting operation trouble with oil pipeline, it is easy and make drillng operation safe and reliable advantage to have a fitting operation.
Description of drawings:
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation.
Fig. 1 installs the situation sketch map for down-hole of the present invention.
Fig. 2 is the structural representation of casing valve main body assembly of the present invention.
Fig. 3 is a casing valve main body assembly longitudinal sectional drawing of the present invention.
Fig. 4 be among Fig. 2 A-A to partial cross-sectional view.
Fig. 5 be among Fig. 4 B-B to partial longitudinal section.
Fig. 6 is a permanent locking of the present invention mechanism partial longitudinal section.
Fig. 7 is an electric hydraulic system principle diagram of the present invention.
The specific embodiment:
Like Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, shown in Figure 6; A kind of automatic control casing valve; This casing valve is at down-hole and the complete tubing string of protective casing 2 usefulness screwed connections, and its degree of depth can be positioned at surface pipe 1 degree of depth also can be positioned at surface pipe 1 degree of depth in addition Anywhere; This casing valve is made up of with casing valve main body assembly 4 no magnetosheath pipe short circuit assembly 3, and no magnetosheath pipe short circuit assembly 3 is arranged on the casing valve main body assembly 4 and through protective casing 2 and is connected with cable; Casing valve main body assembly 4 comprises casing joint pipe nipple 5, eccentric urceolus 7, branch sleeve 10 and lower eccentric joint 12; The order screwed connection from top to bottom of casing joint pipe nipple 5, eccentric urceolus 7, branch sleeve 10, lower eccentric joint 12; Be provided with piston cylinder 13 in the eccentric urceolus 7; Eccentric urceolus 7 lower ends are connected valve seat 16 through lacing wire 14 with lacing wire bolt 15; Valve seat 16 is through gusset bolt 18 fastening gussets 17; Pivot pin 19 is serially connected gusset 17 and torsion spring 20 and valve plate 21, is in normal off status at the effect lower valve plate 21 of torsion spring 20, and lower eccentric joint 12 upper ends are provided with stop pin assembly 22; The thick tube wall outside of eccentric urceolus 7 is provided with electronic device chamber 31 and hydraulic-driven chamber 32 respectively; The chamber outside all is provided with the fastening chamber cover plate 8 of cover plate bolt 9, mainly is provided with singlechip computer system, motor-drive circuit, reversal valve drive circuit, displacement transducer 33 in the electronic device chamber 31, forever opens drive circuit and lithium battery group, mainly is provided with the ON operation hydraulic line in the hydraulic-driven chamber 32, closes and operate hydraulic line, two-position four-way solenoid operated directional valve, motor reducer, overflow valve, hydraulic pump and fuel tank; In the lower end of valve seat 16 pressure sensor 34 is installed; Between pressure sensor 34 and electronic device chamber 31, have axial passing channel 42, one side is provided with permanent locking mechanism in valve seat 16 bottoms, and this permanent locking mechanism comprises electromagnetic valve assembly 37, do not sell spring 38, do not sell 39, stop pin spring 40 and Permanent lock rationed marketing 41; No magnetosheath pipe short circuit assembly 3 comprises excitation coil circuit, magnetic test coil circuit, no magnetosheath pipe pipe nipple and antenna receiving-sending circuit.
The magnetizing coil of no magnetosheath pipe short circuit assembly 3 and magnetic test coil around inner tube material adopt no magnetic material.The distance of separating between no magnetosheath pipe short circuit assembly 3 and the casing valve main body assembly 4 is 10 meters.Locate through sleeve positioning bolt 11 between branch sleeve 10 and the lower eccentric joint 12.Passing channel 42 was provided with linear sealing cover 35 and sealing shroud sealing 36 between valve seat 16 and eccentric urceolus 7.Casing joint pipe nipple 5 lower outside are provided with casing joint sealing 23, and the outside, piston cylinder 13 upper ends and the outside, middle part are provided with sealing 24 and piston lower seal 25 on the piston respectively.Eccentric urceolus 7 lower ends are inboard to be provided with sealing 26 and eccentric tube external seal 27 in the eccentric tube respectively with the outside, and valve seat 16 outsides are provided with valve base sealing 28.Lower eccentric joint 12 upper outside are provided with lower eccentric joint sealing 29, and chamber cover plate 8 is provided with cover plate for sealing 30.The upper surface of eccentric urceolus 7 is provided with cable connector 6.
The present invention goes into the well and cement operations with the protective casing string, and its process and the routine cement operations of going into the well is the same.When under balance pressure drilling was constructed, elder generation descended no magnetosheath pipe short circuit assembly 3 with drilling tool and on casing valve main body assembly 4, stopped, and waited for 5 minutes.As shown in Figure 7, in case the magnetic conductivity that does not have in the magnetosheath pipe short circuit assembly 3 when getting into no magnetosheath pipe short circuit assembly 3 will change, the magnetic test coil circuit can detect corresponding variable signal under the effect of excitation coil circuit when drilling tool; After this variable signal gets into singlechip computer system and is identified, singlechip computer system will be simultaneously to motor-drive circuit and the reversal valve drive circuit signal of giving an order, motor-drive circuit will drive motors and supporting reducer drive hydraulic pump and rotate; Produce high pressure, the reversal valve drive circuit will drive the transposition of two-position four-way solenoid operated directional valve in addition, and high-pressure and hydraulic oil gets into piston cylinder 13 from the ON operation hydraulic line thus; The low pressure oil that is extruded is got back to fuel tank from closing the operation hydraulic line; Move downward at high-pressure and hydraulic effect lower piston tube 13, back down valve plate 21, until till the step of lower eccentric joint 12; Stop pin assembly 22 works simultaneously; Stop piston cylinder 13 to rotate in a circumferential direction, at the duration of work that drilling tool passes through, displacement transducer 33 is monitored the axially-movable of piston cylinder 13 all the time; Will drive hydraulic pump works if any axially-movable, limit piston cylinder 13 axially-movables.During trip-out; The magnetic test coil circuit can detect corresponding variable signal after drilling tool leaves no magnetosheath pipe short circuit assembly 3; Singlechip computer system receive behind this signal will be simultaneously to motor-drive circuit and the reversal valve drive circuit signal of giving an order; Drive the transposition of hydraulic pump works and two-position four-way solenoid operated directional valve simultaneously; High-pressure and hydraulic oil gets into piston cylinder 13 from closing the operation hydraulic line thus, and the low pressure oil that is extruded is got back to fuel tank from the ON operation hydraulic line, moves upward at high-pressure and hydraulic effect lower piston tube 13; Piston cylinder 13 leaves valve plate 21 back valve plates 21 and under torsion spring 20 effects, closes voluntarily, and piston cylinder 13 moves to till the interior step of casing joint pipe nipple 5 always.Singlechip computer system just begins to receive pressure sensor 34 signals automatically after valve plate 21 is closed; And the pressure data signal that will handle sends from antenna; If the force value that wants to obtain under the valve plate 21 can be adorned a reception antenna near the drilling tool bottom; When drilling tool is lowered near no magnetosheath pipe short circuit assembly 3, will receive this pressure signal, the signal that receives can pass to ground through the wired drilling cable mode through wet joint, also can through drilling tool with the wireless drilling appearance send to ground.After finishing, the under balance pressure drilling construction to carry out the permanent open operation of casing valve; Its process is following: last time is drilled into no magnetosheath pipe short circuit assembly and stopped more than 3 one minute, is drilled into down between no magnetosheath pipe short circuit assembly 3 and the casing valve main body assembly 4 again and stops one minute, pulls out of hole after repeating so to operate one time so again; Send signal after singlechip computer system detects this a string course of action, will for the permanent drive circuit of opening; Make 37 adhesives of electromagnetic valve assembly, drive during 37 adhesives of electromagnetic valve assembly and do not sell 39 and be separated from Permanent lock rationed marketing 41, Permanent lock rationed marketing 41 enters in the groove of piston cylinder 13 under the effect of stop pin spring 40; Treat that not selling 39 after electromagnetic valve assembly 37 discharges resets under the effect of not selling spring 38; Pin Permanent lock rationed marketing 41 rear ends, make its permanent location, the permanent open operation of casing valve finishes.
It is understandable that; More than about specific descriptions of the present invention; Only be used to the present invention is described and be not to be subject to the described technical scheme of the embodiment of the invention; Those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the present invention, to reach identical technique effect; As long as satisfy the use needs, all within protection scope of the present invention.
Claims (9)
1. control casing valve automatically for one kind; It is characterized in that: this casing valve is made up of no magnetosheath pipe short circuit assembly (3) and casing valve main body assembly (4), and no magnetosheath pipe short circuit assembly (3) is arranged on the casing valve main body assembly (4) and through protective casing (2) and is connected with cable; Casing valve main body assembly (4) comprises casing joint pipe nipple (5), eccentric urceolus (7), branch sleeve (10) and lower eccentric joint (12); The order screwed connection from top to bottom of casing joint pipe nipple (5), eccentric urceolus (7), branch sleeve (10), lower eccentric joint (12); Be provided with piston cylinder (13) in the eccentric urceolus (7); Eccentric urceolus (7) lower end is connected valve seat (16) through lacing wire (14) with lacing wire bolt (15); Valve seat (16) is through the fastening gusset of gusset bolt (18) (17); Pivot pin (19) is serially connected gusset (17) and torsion spring (20) with valve plate (21); Effect lower valve plate (21) at torsion spring (20) is in normal off status; Lower eccentric joint (12) upper end is provided with stop pin assembly (22), and the thick tube wall outside of eccentric urceolus (7) is provided with electronic device chamber (31) and hydraulic-driven chamber (32) respectively, and the chamber outside all is provided with the fastening chamber cover plate (8) of cover plate bolt (9); Mainly be provided with singlechip computer system, motor-drive circuit, reversal valve drive circuit, displacement transducer (33) in the electronic device chamber (31), forever open drive circuit and lithium battery group; Mainly be provided with the ON operation hydraulic line in the hydraulic-driven chamber (32), close operation hydraulic line, two-position four-way solenoid operated directional valve, motor reducer, overflow valve, hydraulic pump and fuel tank, pressure sensor (34) is installed, between pressure sensor (34) and electronic device chamber (31), have axial passing channel (42) in the lower end of valve seat (16); One side is provided with permanent locking mechanism in valve seat (16) bottom, this permanent locking mechanism comprises electromagnetic valve assembly (37), do not sell spring (38), Xiao not (39), stop pin spring (40) and Permanent lock rationed marketing (41); No magnetosheath pipe short circuit assembly (3) comprises excitation coil circuit, magnetic test coil circuit, no magnetosheath pipe pipe nipple and antenna receiving-sending circuit.
2. according to the described automatic control casing valve of claim 1, it is characterized in that: the magnetizing coil of said no magnetosheath pipe short circuit assembly (3) and magnetic test coil around inner tube material adopt no magnetic material.
3. according to the described automatic control casing valve of claim 1, it is characterized in that: the distance of separating between said no magnetosheath pipe short circuit assembly (3) and the casing valve main body assembly (4) is 10 meters.
4. according to the described automatic control casing valve of claim 1, it is characterized in that: locate through sleeve positioning bolt (11) between said branch sleeve (10) and the lower eccentric joint (12).
5. according to the described automatic control casing valve of claim 1, it is characterized in that: said passing channel (42) was provided with linear sealing cover (35) and sealing shroud sealing (36) between valve seat (16) and eccentric urceolus (7).
6. according to the described automatic control casing valve of claim 1; It is characterized in that: said casing joint pipe nipple (5) lower outside is provided with casing joint sealing (23), and the outside, piston cylinder (13) upper end and the outside, middle part are provided with sealing (24) and piston lower seal (25) on the piston respectively.
7. according to the described automatic control casing valve of claim 1, it is characterized in that: said eccentric urceolus (7) lower end is inboard to be provided with sealing (26) and eccentric tube external seal (27) in the eccentric tube respectively with the outside, and valve seat (16) outside is provided with valve base sealing (28).
8. according to the described automatic control casing valve of claim 1, it is characterized in that: said lower eccentric joint (12) upper outside is provided with lower eccentric joint sealing (29), and chamber cover plate (8) is provided with cover plate for sealing (30).
9. according to the described automatic control casing valve of claim 1, it is characterized in that: the upper surface of said eccentric urceolus (7) is provided with cable connector (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110395038XA CN102493785A (en) | 2011-12-02 | 2011-12-02 | Automatic control sleeve valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110395038XA CN102493785A (en) | 2011-12-02 | 2011-12-02 | Automatic control sleeve valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102493785A true CN102493785A (en) | 2012-06-13 |
Family
ID=46185638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110395038XA Pending CN102493785A (en) | 2011-12-02 | 2011-12-02 | Automatic control sleeve valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102493785A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748012A (en) * | 2012-06-29 | 2012-10-24 | 中国海洋石油总公司 | Underground wireless communication data receiving and transmitting nipple |
| CN103104217A (en) * | 2013-02-06 | 2013-05-15 | 北京六合伟业科技股份有限公司 | Drilling following cable underground hydraulic control sleeving valve |
| CN104455693A (en) * | 2014-11-12 | 2015-03-25 | 中国石油集团长城钻探工程有限公司 | Valve plate opening and closing position measuring device |
| CN104832127A (en) * | 2015-04-29 | 2015-08-12 | 中国石油集团渤海钻探工程有限公司 | Intelligent control casing valve applied to unbalanced drilling/completion |
| CN108240198A (en) * | 2016-12-26 | 2018-07-03 | 中国石油天然气股份有限公司 | Oil well pump crosses pump well washing apparatus |
| CN111706295A (en) * | 2020-07-14 | 2020-09-25 | 西南石油大学 | Radio electromagnetic wave direct-current control pressure-relief sleeve valve |
| CN111764858A (en) * | 2020-07-13 | 2020-10-13 | 上海飞舟博源石油装备股份有限公司 | Downhole packer for offshore platform |
| CN112901212A (en) * | 2021-02-05 | 2021-06-04 | 中铁隧道局集团有限公司 | Tunnel disease treatment method capable of repeatedly grouting and suitable for special slurry |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748012A (en) * | 2012-06-29 | 2012-10-24 | 中国海洋石油总公司 | Underground wireless communication data receiving and transmitting nipple |
| CN102748012B (en) * | 2012-06-29 | 2015-04-15 | 中国海洋石油总公司 | Underground wireless communication data receiving and transmitting nipple |
| CN103104217A (en) * | 2013-02-06 | 2013-05-15 | 北京六合伟业科技股份有限公司 | Drilling following cable underground hydraulic control sleeving valve |
| CN103104217B (en) * | 2013-02-06 | 2015-07-08 | 北京六合伟业科技股份有限公司 | Drilling following cable underground hydraulic control sleeving valve |
| CN104455693A (en) * | 2014-11-12 | 2015-03-25 | 中国石油集团长城钻探工程有限公司 | Valve plate opening and closing position measuring device |
| CN104832127B (en) * | 2015-04-29 | 2017-09-15 | 中国石油集团渤海钻探工程有限公司 | Intelligent control casing valve applied under balance pressure drilling/completion |
| CN104832127A (en) * | 2015-04-29 | 2015-08-12 | 中国石油集团渤海钻探工程有限公司 | Intelligent control casing valve applied to unbalanced drilling/completion |
| CN108240198A (en) * | 2016-12-26 | 2018-07-03 | 中国石油天然气股份有限公司 | Oil well pump crosses pump well washing apparatus |
| CN108240198B (en) * | 2016-12-26 | 2024-03-26 | 中国石油天然气股份有限公司 | Pump-passing well-flushing device for oil pump |
| CN111764858A (en) * | 2020-07-13 | 2020-10-13 | 上海飞舟博源石油装备股份有限公司 | Downhole packer for offshore platform |
| CN111706295A (en) * | 2020-07-14 | 2020-09-25 | 西南石油大学 | Radio electromagnetic wave direct-current control pressure-relief sleeve valve |
| CN111706295B (en) * | 2020-07-14 | 2021-03-23 | 西南石油大学 | Radio electromagnetic wave direct-current control pressure-relief sleeve valve |
| CN112901212A (en) * | 2021-02-05 | 2021-06-04 | 中铁隧道局集团有限公司 | Tunnel disease treatment method capable of repeatedly grouting and suitable for special slurry |
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Application publication date: 20120613 |