CN2563293Y - Casing blanking plug for hydraulic changing valve with pressure - Google Patents
Casing blanking plug for hydraulic changing valve with pressure Download PDFInfo
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- CN2563293Y CN2563293Y CN 02275638 CN02275638U CN2563293Y CN 2563293 Y CN2563293 Y CN 2563293Y CN 02275638 CN02275638 CN 02275638 CN 02275638 U CN02275638 U CN 02275638U CN 2563293 Y CN2563293 Y CN 2563293Y
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Abstract
The utility model provides a casing blanking plug for hydraulic changing valve with pressure, relating to a replacement device of oil production and gas wellhead main control valve. The utility model aims to solve the problems that the prior pressure well valve change is high in cost, long in time and harmful to producing formation, and pollutes environment. The casing blanking plug comprises a mandrel (4), a flexible rubber tube (9) on the mandrel, a ring-shaped slip seat (6) sleeved on the mandrel and a slip (7) hinged with the slip seat, wherein, the front end of the mandrel is provided with a cone (5) with the conical surface rearwards; the slip seat is behind the cone; the front end of the slip is provided with an inclined plane corresponding to the conical surface shape of the cone; a hook (8) is arranged on the slip; the rear the slip seat is provided with the rubber tube; the rear of the rubber tube is provided with a hydraulic cylinder (10) which is sleeved on the mandrel and communicated with a hydraulic pump (34), as well as a piston (11) which is arranged in the hydraulic cylinder and connected with the mandrel. The utility model is fitted with a feed-in component comprising a sealing flange (21), a blowout prevention pipe (25), a transmission rod (27), a screw rod (34), a nut, etc. The utility model is suitable for blocking oil gas wellheads, especially suitable to be used when side through main control valves of oil gas wellheads are replaced.
Description
Technical field
The utility model relates to the exploitation of subterranean oil, gas, particularly the more changing device of oil recovery, gas well mouth main control valve.
Background technology
The wellhead assembly of existing oil, gas well mouth is made of a plurality of well-head valves on the tubing head four-way that is installed in oil recovery, gas well mouth etc. as shown in Figure 6.Tubing head four-way lower through-hole and oil pipe are connected, and last through hole directly is communicated with main control valve and becomes straight-through main control valve 1, about side through hole be communicated with the main control valve side joint respectively and become the main control valve 2,3 that side is led to, main control valve 1,2,3 all adopts gate valve.All the other valves are connected with main control valve in each main control valve postposition side.Through the exploitation of long period, well head is owing to reasons such as corrosion, seal wear out, and valve and other wellhead component can produce leakage in various degree.It is very unfavorable that well-head valve leaks the safety in production of oil, gas well, in case consequence out of control is quite serious, therefore will change leakage valve and well head associated components as required.Valve beyond the main control valve is changed, and can carry out after closing main control valve.The replacing method of existing main control valve, common process adopts well killing change.But adopt the mode of kill-job to change well-head valve, ordinary production to oil, gas well can cause serious interference, and bring following unfavorable factor: a) well killing fluid can cause certain injury to the payzone of oil, gas well, and middle and later periods oil, gas well even possibly can't be resumed production; B) need expend a large amount of funds; C) need a large amount of preparations and employ kill-job equipment; D) discharging of well killing fluid can cause serious pollution.
The utility model content
In view of above-mentioned, the shutoff that the main control valve that the purpose of this utility model is to provide a kind of more changes oil, the side of gas well pipe is logical is used is safe and reliable, plugged well press high, operating cost is low, the activity duration is short, do not injure payzone, fluid pressure type band pressure free from environmental pollution, simple in structure, that volume is little, in light weight, simple to operate is changed valve sleeve pipe blanking plug.
The utility model adopt hydraulic pressure advance coupling type slips hook jail wellhead assembly tubing head four-way side through hole inboard aperture and blanking plug is self-locking in the side through hole of tubing head four-way with hydraulic lock, adopt the packing element closed side through hole that rises big to realize its purpose again to be convenient for changing main control valve.And further adopt hydraulic pressure to send structure to and blanking plug is sent into side through hole realize its purpose.
Fluid pressure type band of the present utility model is pressed and is changed valve sleeve pipe blanking plug (referring to accompanying drawing), comprise axle (4), the packing element of the flexibility on the axle (9), be nested with the slip spider (6) of the annular on axle and the slips (7) that is hinged thereof, the front end of axle has the rearward cone of the conical surface (5), above-mentioned slip spider is at the rear of cone, the front end of slips has the corresponding inclined-plane of conical surface shape with cone, hook (8) is arranged on the slips, the slip spider rear is above-mentioned packing element, and the rear of packing element has be nested with the hydraulic cylinder (10) that communicates with hydraulic pump (33) and the piston that is connected with axle (11) wherein on axle.
There is fishing head (13) rear end of above-mentioned hydraulic cylinder (10), between fishing head and piston (11), back-moving spring (14) is arranged, the centre bore (12) that is communicated with the hydraulic cylinder ante-chamber is arranged in axle (4) rearward end, the hydraulic lock (15) of the check valve-type that is communicated with centre bore is arranged in the rear end of axle, and said hydraulic pump communicates with hydraulic lock.
Front end and the lubricator (25) that sealing flange (21) is communicated with, there are anti-shower nozzle (26) rear end are arranged, and the driven rod in the lubricator runs through that anti-shower nozzle, front end are connected with said axle (4), the rear end is connected with pressing plate (31).Driven rod (27) can be take over that shape, front end are communicated with hydraulic lock (15), rear end and hydraulic pump (33) connection.
Be penetrated with screw rod (34) in the through hole of the bolt hole of the flange of above-mentioned sealing flange (21) and main control valve to be changed and pressing plate (31), screw front end has two locking nuts (35,36) of cooperating with the flange of main control valve to be changed, the rear end has cooperate with pressing plate send nut (37) to.
The tubular blocking (29) of separating that coincide with hydraulic lock (15) is arranged in the tube chamber of above-mentioned driven rod (27) lower end.
The tee junction (22) that is communicated with lubricator (25) is arranged on the above-mentioned sealing flange (21), be communicated with stop valve (23) and pressure meter (24) on the tee junction.
Use sleeve pipe blanking plug of the present utility model, in the valve pocket of main control valve is sent into blanking plug the side through hole of tubing head four-way of wellhead assembly, the hook of slips is placed outside the inboard aperture of side through hole with pressure, the primer fluid press pump travels forward hydraulic cylinder, the cylinder pushes packing element promotes slip spider again together with slips, the inclined-plane of slips front end is under the effect of cone, slips is opened, and utilize hook on the slips to hook inboard mouthful outer wall of side through hole, blanking plug is not released by borehole pressure; When hydraulic cylinder promotes packing element forward, make the compresses in length of packing element and diameter rises greatly to the hole wall of being close to side through hole, with the sealed well internal pressure, stop up side through hole.After this be replaceable main control valve, take out blanking plug the valve pocket of the main control valve after changing subsequently, and close main control valve, finish the replacing of main control valve.
The utility model has following advantage and effect compared with prior art.
One, slip spider of the present utility model, slips, cone, packing element structure, can be in the side through hole of tubing head four-way fixing blanking plug, and make it when work, be in self-locking state, blanking plug can not gone out by borehole pressure, and the side through hole of compression packing element sealing tubing head four-way, guarantee to change the valve safe construction.
Two, the utility model constitutes the hydraulic base sealed structure of sending slip spider promotion slips to by hydraulic cylinder, piston, hydraulic pump, makes the seal operation fixing and packing element of blanking plug reliable, and the well of sealing is pressed can reach 50Mpa.
Three, the utility model by sealing flange, lubricator, anti-shower nozzle, driven rod, send hydraulic cylinder to, send the structure of sending to that hydraulic pump etc. constitutes to, blanking plug can be sent in the side through hole of tubing head four-way of high pressure safely and reliably, and its pushing inlet pressure can reach 50Mpa.
Four, hydraulic lock of the present utility model is conciliate the blocking structure, can control shutoff pressure reliably and blanking plug firmly is installed, and can make things convenient for, deblocking, taking-up blanking plug reliably.
Five, pressure meter structure of the present utility model can reflect the shutoff pressure of blanking plug hydraulic system exactly, so that adjust at random, guarantees to change the valve construction safety.
Six, the utility model sleeve pipe blanking plug simple in structure, volume is little, in light weight, easy to use.When main parts size adopts high duty alloy just to make, its intensity height, long service life, safe and reliable.
Seven, using the utility model sleeve pipe blanking plug to change valve and kill-job changes valve and compares and also have following advantage:
One) operating cost is low.It is about 550,000 yuan that the average every mouthful of well of valve is changed in kill-job; Changing the average every mouthful of well of valve with this sleeve pipe blanking plug is about 150,000 yuan, and every mouthful of well can be saved 400,000 yuan.
Two) activity duration is short.Kill-job is changed valve a bite well and is generally about 3 days; Change valve with this sleeve pipe blanking plug and only need 1 day, can shift to an earlier date 2 days and resume production.
Three) do not injure oil, gas payzone.The well killing fluid that the valve use is changed in kill-job can cause certain injury to payzone oily, gas well, and part middle and later periods oil, gas well can't resume production after adopting kill-job to change valve.Adopt this sleeve pipe blanking plug to change valve, then can the payzone of oil, gas well not caused any harm, middle and later periods oil, gas well can continue to produce.
Four) free from environmental pollution.After the valve operation was changed in kill-job, the discharging of well killing fluid caused severe contamination to environment.Adopt this sleeve pipe blanking plug to change valve, can avoid environment is polluted, pollution charges and damages are administered in corresponding saving.
Sleeve pipe blanking plug of the present utility model is applicable to and stops up oil, gas well mouth, is specially adapted to more changing oil, using during main control valve that the side of gas well mouth is logical.
Below, the utility model is further described to use embodiment and accompanying drawing thereof again.
Description of drawings
Fig. 1 is that a kind of fluid pressure type band pressure of the present utility model is changed the structural representation of valve with the sleeve pipe blanking plug.
Fig. 2 is that the plug members of Fig. 1 is at the structural representation of sealed condition not.
Fig. 3 is the structural representation of the plug members of Fig. 1 in sealed condition.
Fig. 4 is the structural representation of locked state of the hydraulic lock of Fig. 1.
Fig. 5 is the structural representation of deblocking state of the hydraulic lock of Fig. 1.
Fig. 6 is the structural representation of the wellhead assembly of oil, gas well.
The specific embodiment
Embodiment 1
A kind of fluid pressure type band of the present utility model is pressed and is changed valve sleeve pipe blanking plug, as shown in drawings.By plug members with send parts two to and partly form.
Above-mentioned plug members referring to Fig. 1,2,3, is made of axle, cone, slip spider, slips, packing element, hydraulic cylinder, piston, hydraulic lock etc.Above-mentioned axle 4 circular bar shape, the rear end is multidiameter, and the front end of axle fixedly mounts cone 5 with screw thread, and cone is that its conical surface of cone is towards the rear.Above-mentioned slip spider 6 is annular, is sleeved on the axle 4 slidably and is positioned at the rear of cone 5.Be hinged with on the slip spider two or more on circumference equally distributed slips 7, slips is bar shaped, rear end and slip spider are hinged, the front end inboard has the tip that has with the outside of the corresponding inclined-plane of conical surface shape of cone, slips to be shaped on the hook 8 of side outward.Above-mentioned packing element 9 is cylindrical, makes with flexible rubber.Be sleeved on the axle 4 and be positioned at the rear of slip spider.Above-mentioned hydraulic cylinder 10 is cylindrical, and front end is enclosed within on the axle 4 and is positioned at the packing element rear with seal is close.The piston 11 of equipped ladder barrel shape in the front portion in hydraulic cylinder cylinder chamber, being movingly of piston nose than large-diameter portion and hydraulic cylinder.Being connected with the rear end of axle 4 in interior week of piston with screw thread.There is the centre bore 12 that runs through rear end face at the axis position of axle 4 rear ends, and the front end of centre bore is communicated with radial direction through hole and is communicated with the ante-chamber of hydraulic cylinder.The fishing head 13 that the rear end of hydraulic cylinder has the usefulness of sealing cylinder port to be threaded has spiral back-moving spring 14 between fishing head and piston 11.Above-mentioned hydraulic lock 15 referring to Fig. 4,5, is one-way valve structures, and hydraulic lock can be that unitary structure is connected with piston or axle.The valve casing 16 of the hydraulic lock of present embodiment is into a single integrated structure with piston 11, thereby the rear end of axle is nested with in valve casing, the valve pocket of hydraulic lock is communicated with centre bore 12, it is cylindrical that the spool 17 of hydraulic lock is the less ladder of rear portion diameter, the rear end of spool is stretched out the valve opening on the valve casing backward, many axial oil grooves 18 are arranged on the side face than small column at spool rear portion, common sealing ring 19 is being arranged, thereby have the rear portion of the spool of oil groove to cooperate together with the keying of sealing ring with valve opening formation valve formula than on minor diameter and the ladder table top that joins than major diameter.Front end at spool has spiral spring 20, makes hydraulic lock be normally off.
The above-mentioned parts of sending to are referring to Fig. 1,2,3, by sealing flange, lubricator, driven rod, screw rod, send nut etc. to and constitute.The flange of the structure of above-mentioned sealing flange 21 and size and main control valve 2 or 3 matches.The tee junction 22 that is communicated with the centre bore of sealing flange is arranged on the sealing flange, be communicated with stop valve 23 and common pressure meter 24 on the tee junction.Above-mentioned lubricator 25 is tubular, should be able to hold above-mentioned plug members in the tube chamber of lubricator and be with wherein packing element 9 to be sealed and matched.The front end of lubricator is communicated with the centre bore sealing of sealing flange with screw thread, thereby communicates with tee junction 22.The rear end of the lubricator anti-shower nozzle 26 of the closed port that is threaded.The effect of lubricator and anti-shower nozzle is to prevent blowout when plug members is out of control.Above-mentioned driven rod 27 is tubular, stretches into and runs through lubricator from the centre bore of anti-shower nozzle, seals with O RunddichtringO 28 between the centre bore of driven rod and anti-shower nozzle.Be removable with screw thread with the smaller diameter portion of piston rear end in the front end of driven rod and be connected, use ring set in the tube chamber of driven rod hydraulic lock, thereby the tube chamber of driven rod is communicated with hydraulic lock.In the tube chamber of driven rod 27 front ends with screw thread be removable tubular is housed with connecting separate blocking 29.In the rear end of driven rod union 30 is installed, the step-like centre bore of the pressing plate 31 of the rear end of union and plate shape is connected.One end that can bear the common flexible pipe 32 of high pressure runs through the centre bore and union 30 connections of pressing plate, and the other end of flexible pipe connects the hydraulic pump 33 of hand, thereby the tube chamber of hydraulic pump with driven rod 27 is communicated with.Above-mentioned screw rod 34 is elongated, has two.The front end of two screw rods runs through two bolts hole of symmetry on the above-mentioned sealing flange 21 respectively, and the rear end is run through the through hole at above-mentioned pressing plate 31 two ends respectively.At equipped two locking nuts 35,36 of screw front end, the rear end is fitted with sends nut 37 to.
Use this sleeve pipe blanking plug, referring to Fig. 1,2,3,4,5,6, remove oil earlier, the rearmounted valve that the main control valve to be changed 2 or 3 that is communicated with the side through hole of tubing head four-way in the wellhead assembly of gas well is connected, again with screw rod 34 and on two locking nuts 35,36, sealing flange 21 is fixedly mounted on the outlet(discharge) flange 38 of main control valve 2 or 3, before being installed, sealing flange can in advance the front end that the lubricator 25 of above-mentioned plug members and anti-shower nozzle 26 is housed be connected with the centre bore of screw thread with sealing flange 21, so that in the outlet of the sealing main control valve that sealing flange is installed in main control valve and seal well head, seal borehole pressure.Observe the borehole pressure variation and whether reliably seal then by 23 emptying of the stop valve on the sealing flange, and by pressure meter 24.Driven rod 27 is sent into lubricator 25 through the centre bore of anti-shower nozzle 26, and the front end of driven rod is threaded with piston 11, thereby is connected with axle 4 rear ends, the tube chamber of dispatch tube is communicated with hydraulic lock 15, and the rear end is communicated with hydraulic pump 33 through flexible pipe 32.With main control valve 1 standard-sized sheet, twist two locking nuts 35 on the screw rod 34 simultaneously with common instrument, promoting pressing plate 31 moves forward on two screw rods, thereby through pressing plate 31, driven rod 27, plug members in the lubricator 25 is sent, send into the side through hole 40 of tubing head four-way 39 through the valve pocket of main control valve, make slips 7 front ends stretch out inboard mouthful of side through hole.The piston 11 of the hydraulic cylinder 10 in the plug members remains static under the effect of driven rod 27 and borehole pressure at this moment.The primer fluid press pump 33 subsequently, the spool 17 that promotes hydraulic lock 15 is opened hydraulic lock by the tube chamber of flexible pipe 32, driven rod 27, forward, centre bore 12 through axle 4 rear ends pumps into hydraulic oil to hydraulic cylinder 10 again, because piston 11 is fixed on and promotes hydraulic cylinder relatively on the axle 4 and travel forward, promote packing element 9, slip spider 6 again together with slips 7 reaches, under the effect of cone 5 conical surfaces, slips 7 opens, the hook 8 of slips front end catch tubing head four-way 39 side through hole 40 inboard mouthful outer wall 41 and fixing plug members can not released plug members by borehole pressure.At the hydraulic cylinder 10 proal packing elements 9 that compress simultaneously, it is big until the inwall of being close to side through hole 40 that packing element contraction in length, diameter are risen, the sealing borehole pressure.Close hydraulic pump 33 subsequently, the spool 17 of the hydraulic lock 15 in hydraulic cylinder in the acting in conjunction lower piston of pressure and spring 20 retreats to reset closes, and blocks the internal pressure of hydraulic cylinder, makes plug members remain on the duty of obstruction.Open stop valve then, shed the surplus pressure of plug members rear sealing, after plug members sealing to be confirmed is reliable, remove flexible pipe, hydraulic pump, driven rod, sealing flange together with lubricator after, can change the operation of main control valve.The gasket ring 42 that replaceable main control valve of while and tubing head four-way are 39.
After main control valve is changed, reinstall sealing flange 21 together with lubricator 25, be installed in the tube chamber of driven rod 27 front ends separating blocking 29 usefulness screw threads, driven rod being sent into lubricator 25 is connected with the piston 11 of plug members again again, the spool 17 that blocking 29 promotes hydraulic lock 15 is forward separated in utilization, the centre bore that pressure oil in the hydraulic cylinder 10 is conciliate blocking 29 by the oil groove 18 of hydraulic lock 15 flows back in the tube chamber of driven rod 27, just shed the seat seal pressure of hydraulic cylinder, then, twist again and send nut 35 to through pressing plate 31, driven rod 27 promotes axle 4, promote packing element 9 again, slip spider 6 is together with slips 7, the hook that the hook 8 of slips is discharged with inboard mouthful outer wall 41 of side through hole 40 connects, piston 11 in slips and the hydraulic cylinder returns to original state under the effect of back-moving spring 14, oppositely turn subsequently and send nut 35 to, make pressing plate, driven rod is drawn back, and the plug members in the side through hole retreats under the effect of borehole pressure automatically.When borehole pressure is very low, driven rod is pulled back, the valve pocket of the main control valve after changing withdraws from plug members, and the valve main control valve is closed in operation simultaneously.Finish and change the valve operation.
Claims (9)
1, a kind of fluid pressure type band is pressed and is changed valve sleeve pipe blanking plug, comprise axle (4), the packing element of the flexibility on the axle (9), be nested with the slip spider (6) of the annular on axle and the slips (7) that is hinged thereof, the front end that it is characterized in that axle has the rearward cone of the conical surface (5), above-mentioned slip spider is at the rear of cone, the front end of slips has the corresponding inclined-plane of conical surface shape with cone, hook (8) is arranged on the slips, the slip spider rear is above-mentioned packing element, and the rear of packing element has be nested with the hydraulic cylinder (10) that communicates with hydraulic pump (33) and the piston that is connected with axle (11) wherein on axle.
2, fluid pressure type band according to claim 1 is pressed and is changed valve sleeve pipe blanking plug, there is fishing head (13) rear end that it is characterized in that said hydraulic cylinder (10), between fishing head and piston (11), back-moving spring (14) is arranged, the centre bore (12) that is communicated with the hydraulic cylinder ante-chamber is arranged in axle (4) rearward end, the hydraulic lock (15) of the check valve-type that is communicated with centre bore is arranged in the rear end of axle, and said hydraulic pump communicates with hydraulic lock.
3, fluid pressure type band according to claim 1 is pressed and is changed valve sleeve pipe blanking plug, it is characterized in that having front end and the lubricator (25) that sealing flange (21) is communicated with, there are anti-shower nozzle (26) rear end, the driven rod in the lubricator runs through that anti-shower nozzle, front end are connected with said axle (4), the rear end is connected with pressing plate (31).
4, fluid pressure type band according to claim 2 is pressed and is changed valve sleeve pipe blanking plug, it is characterized in that having front end and the lubricator (25) that sealing flange (21) is communicated with, there are anti-shower nozzle (26) rear end, the driven rod in the lubricator (27) is to be taken over shape and runs through that anti-shower nozzle, front end are connected with said axle (4) and be connected with pressing plate (31) with said hydraulic lock (15) connection, rear end and connect with said hydraulic pump (33).
5, fluid pressure type band according to claim 3 is pressed and is changed valve sleeve pipe blanking plug, it is characterized in that being penetrated with screw rod (34) in the through hole of the bolt hole of flange of said sealing flange (21) and main control valve to be changed and pressing plate (31), screw front end has two locking nuts (35,36) of cooperating with the flange of main control valve to be changed, the rear end has cooperate with pressing plate send nut (37) to.
6, fluid pressure type band according to claim 4 is pressed and is changed valve sleeve pipe blanking plug, it is characterized in that being penetrated with screw rod (34) in the through hole of the bolt hole of flange of said sealing flange (21) and main control valve to be changed and pressing plate (31), screw front end has two locking nuts (35,36) of cooperating with the flange of main control valve to be changed, the rear end has cooperate with pressing plate send nut (37) to.
7, press according to claim 4 or 6 described fluid pressure type bands and change valve sleeve pipe blanking plug, it is characterized in that having in the tube chamber of said driven rod (27) lower end the separate blocking (29) of tubular identical with hydraulic lock (15).
8, press and change valve sleeve pipe blanking plug according to claim 3,4,5 or 6 described fluid pressure type bands, it is characterized in that the tee junction (22) that is communicated with lubricator (25) is arranged on the said sealing flange (21), be communicated with stop valve (23) and pressure meter (24) on the tee junction.
9, fluid pressure type band according to claim 7 is pressed and is changed valve sleeve pipe blanking plug, it is characterized in that the tee junction (22) that is communicated with lubricator (25) is arranged on the said sealing flange (21), is communicated with stop valve (23) and pressure meter (24) on the tee junction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02275638 CN2563293Y (en) | 2002-07-08 | 2002-07-08 | Casing blanking plug for hydraulic changing valve with pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02275638 CN2563293Y (en) | 2002-07-08 | 2002-07-08 | Casing blanking plug for hydraulic changing valve with pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2563293Y true CN2563293Y (en) | 2003-07-30 |
Family
ID=33739642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02275638 Expired - Lifetime CN2563293Y (en) | 2002-07-08 | 2002-07-08 | Casing blanking plug for hydraulic changing valve with pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2563293Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832123A (en) * | 2015-04-28 | 2015-08-12 | 中国石油天然气股份有限公司 | Manual blowout prevention device |
| CN105971549A (en) * | 2016-03-04 | 2016-09-28 | 中国石油集团渤海钻探工程有限公司 | Embedded sealing device and installation tool thereof |
| CN113090215A (en) * | 2021-04-07 | 2021-07-09 | 西安宇星石油机械新技术开发有限公司 | Gas well casing pipe non-releasing pressure blocking wellhead replacing device |
-
2002
- 2002-07-08 CN CN 02275638 patent/CN2563293Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832123A (en) * | 2015-04-28 | 2015-08-12 | 中国石油天然气股份有限公司 | Manual blowout prevention device |
| CN104832123B (en) * | 2015-04-28 | 2017-05-10 | 中国石油天然气股份有限公司 | Manual blowout prevention device |
| CN105971549A (en) * | 2016-03-04 | 2016-09-28 | 中国石油集团渤海钻探工程有限公司 | Embedded sealing device and installation tool thereof |
| CN113090215A (en) * | 2021-04-07 | 2021-07-09 | 西安宇星石油机械新技术开发有限公司 | Gas well casing pipe non-releasing pressure blocking wellhead replacing device |
| CN113090215B (en) * | 2021-04-07 | 2022-12-30 | 西安宇星石油机械新技术开发有限公司 | Gas well casing non-releasing pressure blocking wellhead replacing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: LUZHOU CHUANYOU DRILL TOOLS CO., LTD. Free format text: FORMER OWNER: LUZHOU CHANGJIANG HYDRAULIC PIECE MANUFACTURING CO., LTD. Effective date: 20041022 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20041022 Address after: 646006 North madder Road, madder Town, Luzhou, Sichuan Patentee after: Luzhou Chuanyou Driling Equipment Co.,Ltd. Address before: 646006 Luzhou city of Sichuan Province Southern District Shu Lu Road Patentee before: Changjiang Hydraulic Piece Manufacturing Co., Ltd., Luzhon |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20120708 Granted publication date: 20030730 |