CN201347728Y - Hydraulic pressure pilot circuit of tube block underground - Google Patents
Hydraulic pressure pilot circuit of tube block underground Download PDFInfo
- Publication number
- CN201347728Y CN201347728Y CNU2009200019801U CN200920001980U CN201347728Y CN 201347728 Y CN201347728 Y CN 201347728Y CN U2009200019801 U CNU2009200019801 U CN U2009200019801U CN 200920001980 U CN200920001980 U CN 200920001980U CN 201347728 Y CN201347728 Y CN 201347728Y
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- clamping device
- pipe clamping
- oil
- loop
- circuit
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Abstract
The utility model discloses a hydraulic pressure pilot circuit of tube block underground which is used for operation under pressure in oil water well. The hydraulic pressure pilot circuit can control action of the tube block efficiently and ensure safety in production. The hydraulic pressure pilot circuit includes a hydraulic pressure source, a changing-over valve, a big and a small chambers of a fixed tube block, a big and a small chambers of a move tube block. The changing-over valve, the fixed tube block and the move tube block constitute a block circuit and a loosen circuit of two tube block, a direct control sequence valve communicates with an oil inlet path of the loosen circuit of the fixed tube block, and an oil inlet path of the block circuit of the move tube block; the direct control one-way sequence valve communicates with an oil inlet path of the block circuit of the fixed tube block, and an oil inlet path of the loosen circuit of the move tube block. One changing-over valve is used for controlling oil inlet and oil return of the hydraulic pressure control circuit of the fixed tube block and the move tube block which blocks one tube block firstly, then the other tube block is loosened.
Description
Technical field
The utility model relates to the hydraulic control circuit of the downhole operation equipment of petroleum industry, particularly down-hole column clamping device, is applicable to the Operating Pressure of oil-water well, and the effectively fixedly action of pipe clamping device and the pipe clamping device that moves about of control guarantees to keep the safety in production.
Background technology
Remove in the workover treatment of oil pipe at oil-water well, Operating Pressure is to have in well under the situation of pressure, with one fixedly pipe clamping device and the pipe clamping device that moves about rotate the clamping oil pipe, and oil pipe is tripped out or G.I.H well head by add load control under the borehole pressure effect in order to avoid oil pipe flies out.
The fixedly pipe clamping device on the existing Operating Pressure device and the pipe clamping device that moves about are to adopt a three position four-way directional control valve to carry out independent control separately respectively, but can't realize linkage interlockedly between these two reversal valves, and have the following disadvantages:
In case maloperation appears in 1 operating personnel, the state that two pipe clamping devices all are in non-clamping may appear, cause the oil pipe well head that flies out;
2, Operating Pressure wellhead platform staff is many, and the handle of running into reversal valve because of carelessness also might cause the oil pipe well head that flies out;
3, require operating personnel to concentrate, operation is very careful, easily causes battle-weary;
4, manipulation strength is big, and efficient is low.
Summary of the invention
The purpose of this utility model provides the hydraulic control circuit of down-hole column clamping device, only use a reversal valve control fixing pipe clamping device simultaneously and the chucking of the pipe clamping device that moves about with unclamp action, after can realizing that finally a pipe clamping device tightens earlier, the sequentially-operating that another pipe clamping device just can unclamp is to guarantee the safety of construction operation.
Use the present technique solution can reach above-mentioned purpose: this hydraulic control circuit comprises hydraulic power source, reversal valve, the fixedly large and small chamber of pipe clamping device oil cylinder and the large and small chamber of the pipe clamping device oil cylinder that moves about, reversal valve and fixedly pipe clamping device and the pipe clamping device that moves about constitute the chucking loop of two pipe clamping devices respectively and unclamp the loop, directly control sequence valve and fixing pipe clamping device and unclamp the oil-feed oil circuit that the oil-feed oil circuit in loop and the pipe clamping device that moves about tighten the loop and be communicated with; Straight control one way sequence valve is with fixedly the oil-feed oil circuit in pipe clamping device chucking loop and the oil-feed oil circuit that the pipe clamping device that moves about unclamps the loop are communicated with.After realizing that a pipe clamping device tightens earlier, the sequentially-operating that another pipe clamping device just can unclamp.
The beneficial effects of the utility model are: the utility model only control fixing pipe clamping device simultaneously with a reversal valve and the chucking of the pipe clamping device that moves about with unclamp, and can realize a pipe clamping device earlier behind the chucking, the sequentially-operating that another pipe clamping device could unclamp again.That is to say that before a pipe clamping device unclamped therein, another pipe clamping device must be in clamp position, so just can guarantee that down-hole string has at least one pipe clamping device to be in clamp position all the time, under the borehole pressure effect, fly out from well head to avoid oil pipe.Only, simplified operating personnel's content of operation with a reversal valve.So just can when ensureing the oil water well working with pressure construction safety, alleviate operating personnel's manipulation strength and stress significantly, avoid battle-weary, avoid accident potential, realize the raising of operating efficiency and economic benefit.
Description of drawings
Accompanying drawing is the structural representation of the utility model hydraulic control circuit.
Among the figure: hydraulic control one-way valve 1, one way valve 2, directly control sequence valve 3, hydraulic control one-way valve 4, directly control one way sequence valve 5, manually relief valve 6, manually relief valve 7, reversal valve 8, switch operation handle 9, hydraulic power source 10, fuel tank 11, fixedly big chamber 12, fixedly loculus 13, the big chamber 14 of the pipe clamping device oil cylinder that moves about, the loculus 15 of the pipe clamping device oil cylinder that moves about, the one way valve 16 of pipe clamping device oil cylinder of pipe clamping device oil cylinder
The specific embodiment
Below in conjunction with drawings and Examples the utility model is done further detailed description: referring to accompanying drawing, the utility model is exactly to allow reversal valve 8 control fixing pipe clamping device simultaneously and the oil-feed and the oil return of the pipe clamping device hydraulic control circuit that moves about, make one of them pipe clamping device chucking earlier, another pipe clamping device could unclamp again, the safety of assurance operation and convenient.
This hydraulic control circuit comprises reversal valve 8, hydraulic power source 10, the fixedly big chamber 12 and the loculus 13 of pipe clamping device oil cylinder and the big chamber 14 and the loculus 15 of the pipe clamping device oil cylinder that moves about.Fixedly the big chamber 12 of pipe clamping device oil cylinder connects hydraulic control one-way valve 1 and reversal valve 8 and hydraulic power source 10 by hydraulic line, constitutes the fixedly oil-feed oil circuit in pipe clamping device chucking loop, also is that fixedly pipe clamping device unclamps the oil return circuit in loop simultaneously.Fixedly the loculus 13 of pipe clamping device oil cylinder connects one way valve 2 and reversal valve 8 by hydraulic line, constitutes fixedly that pipe clamping device unclamps the oil-feed oil circuit in loop, also is simultaneously that fixedly pipe clamping device tightens the oil return circuit in loop.More than two oil circuits can form the chucking of fixing pipe clamping device respectively and unclamp the loop, be the fixedly hydraulic control circuit of pipe clamping device.The move about big chamber 14 of pipe clamping device oil cylinder connects hydraulic control one-way valve 4 by hydraulic line and is communicated with the oil-feed oil circuit that fixing pipe clamping device unclamps the loop, constitutes the oil-feed oil circuit that the pipe clamping device that moves about tightens the loop, and the while also is that the pipe clamping device that moves about unclamps the oil return circuit in loop.The loculus 15 of pipe clamping device oil cylinder of moving about connects straight control one way sequence valve 5 by hydraulic line and is communicated with the fixing oil-feed oil circuit in the chucking loop of pipe clamping device, constituting the pipe clamping device that moves about and unclamp the oil-feed oil circuit in loop, also is simultaneously the oil return circuit in pipe clamping device chucking loop of moving about.More than two oil circuits formed the chucking of the pipe clamping device that moves about respectively and unclamped the loop, and then the common hydraulic control circuit that constitutes the pipe clamping device that moves about.Reversal valve 8 and the fixedly pipe clamping device and the pipe clamping device that moves about have constituted the big chamber 12 and 14 and the loculus 13 of oil cylinder and 15 oil-feed oil circuit and oil return circuit of its oil cylinder.Straight control sequence valve 3 and fixing pipe clamping device unclamp the oil-feed oil circuit that the oil-feed oil circuit in loop and the pipe clamping device that moves about tighten the loop and are communicated with.Fixedly pipe clamping device unclamps the oil-feed oil circuit in loop, the fixing oil return circuit in pipe clamping device chucking loop just, and the oil-feed oil circuit in the pipe clamping device that moves about chucking loop, the pipe clamping device that just moves about unclamps the oil return circuit in loop.Straight control one way sequence valve 5 is with fixedly the oil-feed oil circuit in pipe clamping device chucking loop and the oil-feed oil circuit that the pipe clamping device that moves about unclamps the loop are communicated with.Fixedly pipe clamping device tightens the oil-feed oil circuit in loop, and just fixedly pipe clamping device unclamps the oil return circuit in loop, and the pipe clamping device that moves about unclamps the oil-feed oil circuit in loop, the oil return circuit in the pipe clamping device that just moves about chucking loop.On the big chamber 12 of fixing pipe clamping device oil cylinder and the hydraulic line between the hydraulic control one-way valve 1, be provided with manual relief valve 6, fixedly pipe clamping device and the pipe clamping device that moves about are in simultaneously and use manual relief valve 6 under the situation of releasing orientation at needs, manually relief valve 6 guarantees to move about pipe clamping device when being in releasing orientation, realizes fixedly unclamping of pipe clamping device.On the big chamber 14 of the pipe clamping device oil cylinder that moves about and the hydraulic line between the hydraulic control one-way valve 4, be provided with manual relief valve 7, with manually relief valve 6 is the same, all be under two pipe clamping devices of needs are in the situation of releasing orientation simultaneously, to use, different is, manually relief valve 7 is when guaranteeing that fixedly pipe clamping device is in releasing orientation, realization the unclamping of pipe clamping device of moving about.
The oil-feed oil circuit in the pipe clamping device that moves about chucking loop is communicated with by directly controlling sequence valve 3 with the oil-feed oil circuit that fixing pipe clamping device unclamps the loop, straight control sequence valve 3 passes through hydraulic line, one end hydraulic control one-way valve 4 with manually be communicated with on the hydraulic line between the relief valve 7, the other end is communicated with between the loculus 13 of fixing pipe clamping device oil cylinder and one way valve 2.The oil-feed oil circuit that the oil-feed oil circuit in the pipe clamping device that moves about chucking loop and fixing pipe clamping device unclamp the loop then by hydraulic control one-way valve 1 with directly control sequence valve 3 and be communicated with.Such design can guarantee behind the pipe clamping device chucking that moves about, along with oil-feed is continued in the big chamber 14 of the pipe clamping device oil cylinder that moves about, pressure in the big chamber 14 of its oil cylinder will raise, when rising to the pressure set points of straight control sequence valve 3, straight control sequence valve 3 is opened automatically, be communicated with the fixedly loculus 13 of pipe clamping device oil cylinder, forming fixedly, pipe clamping device unclamps the oil-feed oil circuit in loop.Continue oil-feed and make that fixedly pipe clamping device oil cylinder loculus 13 interior pressure rise, when reaching the opening pressure of hydraulic control one-way valve 1, directly control sequence valve 3 and can open the hydraulic control one-way valve of being controlled by it 1, being communicated with fixedly, pipe clamping device unclamps the oil return circuit in loop.Making fixedly, pipe clamping device is in the hydraulic control opening.Like this, fixedly pipe clamping device two oil circuits unclamping the loop couple together, and just constitute the loop of unclamping of fixing pipe clamping device, and making fixedly, pipe clamping device unclamps.In sum, behind the pipe clamping device chucking that moves about, fixedly pipe clamping device can unclamp.
Fixedly the oil-feed oil circuit in pipe clamping device chucking loop is communicated with by straight control one way sequence valve 5 with the oil-feed oil circuit that the pipe clamping device that moves about unclamps the loop, straight control one way sequence valve 5 passes through hydraulic line, one end is communicated with on the hydraulic line between hydraulic control one-way valve 1 and the reversal valve 8, and the other end is communicated with the loculus 15 of the pipe clamping device oil cylinder that moves about.Fixedly the oil return circuit in pipe clamping device chucking loop then is communicated with by hydraulic control one-way valve 4 with the oil return circuit that the pipe clamping device that moves about unclamps the loop, such design can guarantee after fixedly pipe clamping device tightens, along with oil-feed is continued in its big chamber 12 of oil cylinder, fixedly the pressure in the big chamber 12 of pipe clamping device oil cylinder will rise gradually, when reaching the pressure set points of straight control one way sequence valve 5, straight control one way sequence valve 5 is opened automatically, the loculus 15 that is communicated with the pipe clamping device oil cylinder that moves about forms the pipe clamping device that moves about and unclamps the oil-feed oil circuit in loop.Lasting oil-feed raises the pressure in the pipe clamping device oil cylinder loculus 15 that moves about, when rising to the opening pressure of hydraulic control one-way valve 4, straight control one way sequence valve 5 can be opened the hydraulic control one-way valve 4 by its control, be communicated with the pipe clamping device that moves about and unclamp the oil return circuit in loop, make the pipe clamping device that moves about be in the hydraulic control opening.Like this, two oil circuits that the pipe clamping device that moves about unclamps the loop couple together, and just constitute the loop of unclamping of the pipe clamping device that moves about, and the pipe clamping device that moves about is unclamped.In sum, after fixedly pipe clamping device tightened, the pipe clamping device that moves about carried out action of releasing again.
When switch operation handle 9 pushes away forward, then connect B point and C point in the reversal valve 8, it is the right position that switch operation handle 9 is in reversal valve 8, hydraulic oil enters fixedly from hydraulic power source 10 through reversal valve 8, and pipe clamping device unclamps the oil-feed oil circuit in loop, because the single effect of one way valve 2, this oil circuit is obstructed, and hydraulic oil can't enter in the loculus 13 of fixing pipe clamping device oil cylinder, so fixedly pipe clamping device can not unclamp.When hydraulic oil is stopped by one way valve 2, also enter in the big chamber 14 of the pipe clamping device oil cylinder that moves about through behind the hydraulic control one-way valve 4, form the oil-feed oil circuit in the pipe clamping device chucking loop of moving about.In the time of along with the continuous oil-feed in the big chamber of the pipe clamping device oil cylinder that moves about 14, move about the loculus 15 of pipe clamping device oil cylinder by the one way valve 16 in the straight control one way sequence valve 5, the oil-feed oil circuit that enters fixing pipe clamping device chucking loop carries out oil return, with the move about oil return circuit in pipe clamping device chucking loop of formation.The chucking loop that is communicated with the pipe clamping device that moves about like this by above two oil circuits, the action that the pipe clamping device that moves about will tighten.Hydraulic oil in the oil return circuit in the pipe clamping device that moves about chucking loop is behind process one way valve 16, a part flows back in the fuel tank that straight control one way sequence valve 5 provides for oneself, another part in hydraulic control one-way valve 1 enters the big chamber 12 of fixing pipe clamping device oil cylinder, the action that fixing pipe clamping device is also tightened simultaneously.Therefore, before the pipe clamping device chucking that moves about, fixedly pipe clamping device is to keep clamp position always.The oil-feed oil circuit in the pipe clamping device that moves about chucking loop is communicated with by directly controlling sequence valve 3 with the oil-feed oil circuit that fixing pipe clamping device unclamps the loop, the oil-feed oil circuit in the pipe clamping device that moves about chucking loop then is communicated with by hydraulic control one-way valve 1 with the oil-feed oil circuit that fixing pipe clamping device unclamps the loop, the purpose of such design as described in the text, be to guarantee that fixedly pipe clamping device just can unclamp after the pipe clamping device chucking action of moving about puts in place.That is, before the pipe clamping device chucking that moves about, fixedly pipe clamping device also is in clamp position, and after the pipe clamping device chucking that moves about, fixedly pipe clamping device unclamps again.
When if switch operation handle 9 is pulled backward, with A point and the D point that connects in the reversal valve 8, be the left side position that switch operation handle 9 is in reversal valve 8, hydraulic oil enters the big chamber 12 of fixing pipe clamping device oil cylinder through reversal valves 8 from hydraulic power source 10, forms the oil-feed oil circuit that tightens the loop.Fixedly the loculus 13 of pipe clamping device oil cylinder can pass through one way valve 2 oil returns again, and then fixedly the oil return circuit in pipe clamping device chucking loop possesses.Like this, above-mentioned two oil circuits are communicated with the fixedly chucking loop of pipe clamping device, fixedly the pipe clamping device chucking.Fixedly the hydraulic oil in the oil return circuit in pipe clamping device chucking loop is behind process one way valve 2, the part reversal valve 8 back oil sump tanks 11 of flowing through, another part in hydraulic control one-way valve 4 enters the big chamber 14 of the pipe clamping device oil cylinder that moves about, the action that the pipe clamping device that moves about is also tightened simultaneously.Therefore, before fixedly pipe clamping device tightened, the pipe clamping device that moves about always kept clamp position.Fixedly the oil-feed oil circuit in pipe clamping device chucking loop is communicated with by straight control one way sequence valve 5 with the oil-feed oil circuit that the pipe clamping device that moves about unclamps the loop, fixedly the oil-feed oil circuit in pipe clamping device chucking loop then is communicated with by hydraulic control one-way valve 4 with the oil-feed oil circuit that the pipe clamping device that moves about unclamps the loop, the purpose of such design as described in the text, after can guaranteeing that fixedly the action of pipe clamping device chucking puts in place, the pipe clamping device that moves about unclamps again.That is, before fixedly pipe clamping device tightened, the pipe clamping device that moves about also was in clamp position, and after fixedly pipe clamping device tightened, the pipe clamping device that moves about just can unclamp.
Therefore, no matter the switch operation handle 9 of reversal valve 8 is in position, a left side or right position, the effect that realizes all is to make two pipe clamping device sequentially-operatings: before a pipe clamping device chucking, the another one pipe clamping device will keep clamp position always, behind the pipe clamping device chucking of needs chucking, that pipe clamping device that is in clamp position can unclamp just now in addition.
Claims (9)
1, the hydraulic control circuit of down-hole column clamping device, comprise reversal valve (8), hydraulic power source (10), the fixedly big chamber (12) of pipe clamping device oil cylinder and the big chamber (14) and the loculus (15) of the loculus (13) and the pipe clamping device oil cylinder that moves about, it is characterized in that reversal valve (8) and the fixing pipe clamping device and the pipe clamping device that moves about constitute oil-feed oil circuit and oil return circuit, directly control sequence valve (3) and be communicated with the oil-feed oil circuit in the chucking loop of the oil-feed oil circuit that unclamps the loop of fixing pipe clamping device and the pipe clamping device that moves about; Straight control one way sequence valve (5) is with fixedly the oil-feed oil circuit in pipe clamping device chucking loop and the oil-feed oil circuit that the pipe clamping device that moves about unclamps the loop are communicated with.
2, hydraulic control circuit according to claim 1, it is characterized in that fixedly the big chamber (12) of pipe clamping device oil cylinder connects hydraulic control ball-and-seat (1) and reversal valve (8) and hydraulic power source (10) by hydraulic line, constitute the fixedly oil-feed oil circuit in pipe clamping device chucking loop.
3, hydraulic control circuit according to claim 1 is characterized in that fixedly the loculus of pipe clamping device oil cylinder (13) connects ball-and-seat (2) by hydraulic line and constitutes fixedly with reversal valve (8) that pipe clamping device unclamps the oil-feed oil circuit in loop.
4, hydraulic control circuit according to claim 2 is characterized in that being provided with manual relief valve (6) on the big chamber (12) of fixing pipe clamping device oil cylinder and the hydraulic line between the hydraulic control ball-and-seat (1).
5, hydraulic control circuit according to claim 1, it is characterized in that the moving about big chamber (14) of pipe clamping device oil cylinder connects hydraulic control ball-and-seat (4) by hydraulic line and is communicated with the oil-feed oil circuit that fixing pipe clamping device unclamps the loop, and the formation pipe clamping device that moves about tightens the oil-feed oil circuit in loop.
6, hydraulic control circuit according to claim 1, the loculus (15) of pipe clamping device oil cylinder of it is characterized in that moving about connects straight control one way sequence valve (5) by hydraulic line and is communicated with the fixing oil-feed oil circuit in pipe clamping device chucking loop, and the formation pipe clamping device that moves about unclamps the oil-feed oil circuit in loop.
7, the oil-feed oil circuit that hydraulic control circuit according to claim 1, it is characterized in that moving about the oil-feed oil circuit in pipe clamping device chucking loop and fixing pipe clamping device unclamp the loop is communicated with on the hydraulic line between hydraulic control ball-and-seat (1) and the reversal valve (8) by directly controlling one way sequence valve (5).
8, hydraulic control circuit according to claim 1 is characterized in that being provided with manual relief valve (7) the big chamber (14) of the pipe clamping device oil cylinder that moves about is communicated with hydraulic line between the place with straight control sequence valve (3) on.
9, hydraulic control circuit according to claim 1, it is characterized in that directly controlling sequence valve (3) and pass through hydraulic line, one end is communicated with between the fixing loculus of pipe clamping device oil cylinder (13) and ball-and-seat (2), the other end the hydraulic control ball-and-seat (4) of the pipe clamping device that moves about with manually be communicated with on the hydraulic line between the relief valve (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200019801U CN201347728Y (en) | 2009-01-05 | 2009-01-05 | Hydraulic pressure pilot circuit of tube block underground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200019801U CN201347728Y (en) | 2009-01-05 | 2009-01-05 | Hydraulic pressure pilot circuit of tube block underground |
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| Publication Number | Publication Date |
|---|---|
| CN201347728Y true CN201347728Y (en) | 2009-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200019801U Expired - Fee Related CN201347728Y (en) | 2009-01-05 | 2009-01-05 | Hydraulic pressure pilot circuit of tube block underground |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201347728Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105625956A (en) * | 2014-10-31 | 2016-06-01 | 中国石油天然气股份有限公司 | Mechanical arm and control method thereof |
| CN109773817A (en) * | 2019-04-04 | 2019-05-21 | 福建晋工机械有限公司 | A kind of not isometrical long pole fixture |
| CN110762086A (en) * | 2019-10-15 | 2020-02-07 | 徐州立方机电设备制造有限公司 | Hydraulic locking device of vertical shaft hybrid lifting system |
| CN114151397A (en) * | 2021-11-08 | 2022-03-08 | 上海中联重科桩工机械有限公司 | Sleeve clamping device and full-sleeve full-slewing drilling machine |
-
2009
- 2009-01-05 CN CNU2009200019801U patent/CN201347728Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105625956A (en) * | 2014-10-31 | 2016-06-01 | 中国石油天然气股份有限公司 | Mechanical arm and control method thereof |
| CN105625956B (en) * | 2014-10-31 | 2017-10-17 | 中国石油天然气股份有限公司 | Mechanical arm and its control method |
| CN109773817A (en) * | 2019-04-04 | 2019-05-21 | 福建晋工机械有限公司 | A kind of not isometrical long pole fixture |
| CN110762086A (en) * | 2019-10-15 | 2020-02-07 | 徐州立方机电设备制造有限公司 | Hydraulic locking device of vertical shaft hybrid lifting system |
| CN110762086B (en) * | 2019-10-15 | 2021-07-27 | 徐州立方机电设备制造有限公司 | Hydraulic locking device of vertical shaft hybrid lifting system |
| CN114151397A (en) * | 2021-11-08 | 2022-03-08 | 上海中联重科桩工机械有限公司 | Sleeve clamping device and full-sleeve full-slewing drilling machine |
| CN114151397B (en) * | 2021-11-08 | 2024-04-09 | 上海中联重科桩工机械有限公司 | Casing clamping device and full casing full-circle drilling machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shandong Dadonglian Petroleum Equipment Co., Ltd. Assignor: SINOPEC Shengli Oilfield Drilling Technology Institute Contract record no.: 2011370000546 Denomination of utility model: Hydraulic pressure pilot circuit of tube block underground Granted publication date: 20091118 License type: Exclusive License Record date: 20111220 |
|
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: Shandong Dadonglian Petroleum Equipment Co., Ltd. Assignor: SINOPEC Shengli Oilfield Drilling Technology Institute Contract record no.: 2011370000546 Date of cancellation: 20120924 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091118 Termination date: 20130105 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |