CN217080425U - Sand-proof temporary blocking valve capable of being repeatedly opened and closed and having reverse circulation function - Google Patents
Sand-proof temporary blocking valve capable of being repeatedly opened and closed and having reverse circulation function Download PDFInfo
- Publication number
- CN217080425U CN217080425U CN202220642975.4U CN202220642975U CN217080425U CN 217080425 U CN217080425 U CN 217080425U CN 202220642975 U CN202220642975 U CN 202220642975U CN 217080425 U CN217080425 U CN 217080425U
- Authority
- CN
- China
- Prior art keywords
- reverse circulation
- valve plate
- sand
- valve
- sealing ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Details Of Valves (AREA)
Abstract
The utility model discloses a can relapse switch and take temporary stifled valve of sand prevention mould of reverse circulation function, including top connection, reverse circulation cylinder liner, spring support cover, circulating valve compression spring, reverse circulation piston, sealed packing, intermediate head, valve plate compression spring, valve plate push cylinder, valve plate and lower clutch, the top connection is connected to reverse circulation cylinder liner one end, and the other end is connected with the one end of intermediate head, and the inside upper end department of this reverse circulation cylinder liner is equipped with circulating valve compression spring and spring support cover, and its inside lower extreme department is equipped with reverse circulation piston and sealed packing, the other end of intermediate head is connected with the one end of valve plate cylinder liner, and the other end and the lower clutch of this valve plate cylinder liner are connected, the lower clutch middle part is equipped with the valve plate, and the lower part is provided with shearing pin and the stifled cap of pin, and inside is equipped with valve plate compression spring and valve plate push cylinder. The bottom is matched to drag a fracturing packer, so that multi-layer fracturing can be carried out in a segmented mode without bridge plug packing, and when sand blockage occurs, sand flushing and well washing can be carried out in a reverse circulation mode.
Description
Technical Field
The utility model relates to an oil gas field horizontal well multilayer fracturing technical field, in particular to can relapse the switch and take sand mould temporary plugging prevention valve of reverse circulation function.
Background
At present, the shale gas horizontal well fracturing in China mainly adopts mechanical bridge plug packing subsections, including different types such as fast drilling bridge plugs, large drift diameter bridge plugs, soluble bridge plugs and the like.
The bridge plug segmentation process has good effect, but has high requirement on the drift diameter of a shaft, and the bridge plug is drilled and ground after fracturing, so that the cost is high; the dissolubility of the soluble bridge plug is poor, and the controllability of the dissolution time is poor; the large-drift-diameter bridge plug is difficult to process due to blocking during pumping, and the non-full drift diameter of a pressed shaft affects liquid drainage and other subsequent operations (such as sand washing, production logging and tubing running).
Disclosure of Invention
In order to overcome above-mentioned prior art's weak point, the utility model provides a can relapse switch and take the temporary stifled valve of sand mould of preventing of reverse circulation function, cooperation bottom drags the fracturing packer, the segmentation mode that can realize not having the bridging plug packing carries out the multilayer fracturing, when taking place the sand stifled, can also carry out the sand washing of reverse circulation and wash the well, contrast other multilayer fracturing construction technology, need not to bore the bridging plug to fast and remove, the waiting for solution time that need not soluble bridging plug, satisfy the production requirement of the full latus rectum of sleeve pipe behind the pressure, be suitable for equally with pipe damage casing change well, do not choose well condition, need not to produce the maintenance cost that changes casing damage well and can carry out multistage fracturing construction.
In order to realize the technical purpose, the utility model provides a scheme is: the utility model provides a can relapse switch and take sand mould temporary plugging prevention valve of reverse circulation function, includes top connection, reverse circulation cylinder liner, spring support cover, circulating valve compression spring, reverse circulation piston, sealed packing, intermediate head, valve plate compression spring, valve plate pusher, valve plate and lower clutch, the top connection is connected to reverse circulation cylinder liner one end, and the other end is connected with the one end of intermediate head, and the inside upper end department of this reverse circulation cylinder liner is equipped with circulating valve compression spring and spring support cover, and its inside lower extreme department is equipped with reverse circulation piston and sealed packing, the other end of intermediate head is connected with the one end of valve plate cylinder liner, and the other end and the lower clutch of this valve plate cylinder liner are connected, the lower clutch middle part is equipped with the valve plate, and the lower part is provided with shearing pin and the stifled cap of pin, and inside is equipped with valve plate compression spring and valve plate pusher.
In the technical scheme, the lower end of the upper joint is connected with the upper end of the reverse circulation cylinder through threads and is sealed through a first O-shaped sealing ring, waist-shaped grooves are uniformly distributed in the middle lower section of the reverse circulation cylinder sleeve to provide a reverse circulation liquid flow channel, and the tail part of the reverse circulation cylinder sleeve is connected with the external threads of the middle joint through threads and is sealed through a second O-shaped sealing ring.
In the technical scheme, the upper end face of the spring support sleeve is provided with threads, the bottom of each thread is provided with a cylindrical liquid inlet hole, a first sand-prevention inner hexagonal screw is arranged inside each thread, and the bottom of each first sand-prevention inner hexagonal screw is provided with uniformly distributed sand filtering holes, so that liquid can enter a cavity inside the reverse circulation cylinder sleeve.
In the technical scheme, the upper end face of a compression spring of the circulating valve is contacted with the lower end face of an upper step of the spring support sleeve, and the lower end face of the spring support sleeve is contacted with the upper end face of the reverse circulation piston.
In the technical scheme, a third O-shaped sealing ring and a fourth O-shaped sealing ring are respectively arranged in the sealing grooves of the inner wall and the outer wall of the upper end of the reverse circulation piston, and the middle lower part of the reverse circulation piston is sealed with the inner wall of the sealing packing in an interference extrusion stroke manner.
In the technical scheme, a plurality of uniformly distributed triangular threaded holes are formed in the circumference of the middle lower part of the valve plate cylinder sleeve, a small-diameter through hole is formed in the hole bottom of each triangular thread, and a second sand-prevention inner hexagonal screw with a sand filtering hole is arranged in each triangular threaded hole.
In the technical scheme, a fifth O-shaped sealing ring is arranged between the intermediate joint and the valve plate cylinder sleeve, and a sixth O-shaped sealing ring is arranged at the upper part of the valve plate push cylinder and is in stroke sliding seal with the inner wall of the valve plate cylinder sleeve.
In the above technical scheme, a seventh O-ring seal is arranged between the valve plate cylinder sleeve and the lower joint, an eighth O-ring seal is arranged between the valve plate and the valve plate push cylinder, and a ninth O-ring seal is arranged between the valve plate and the lower joint.
In the technical scheme, the lower part of the lower joint is provided with a threaded hole which is matched and sealed with the pin block cap and the tenth O-shaped sealing ring in a stroke matching way.
The utility model has the advantages that: the bottom is matched to drag the packer during multi-layer fracturing to realize plugging between the inside of an oil pipe and the annulus of an oil sleeve, the cost of drilling the bridge plug at a lower speed and drilling the bridge plug at a lower speed is avoided, the unadditive waiting time of waiting for complete dissolution of the soluble bridge plug at the lower speed is avoided, the defect that a production discharge channel is not large enough after the pressure of the bridge plug with a large drift diameter is eliminated, a controllable valve plate is in an open state when a pipe column is put in, underground liquid can be automatically filled into the oil pipe conveniently, automatic liquid filling is realized, after the packer is well seated when fracturing is needed, the annulus is pumped at a lower pressure to close the one-way valve for the first time, after the pressure relief of the fracturing is finished, the valve plate is automatically closed, the control of the pressure in the oil pipe is realized, the packer matched with deblocking can be dragged to other layers again, the pressure is increased again, the valve plate can be opened, thereby carrying out the pressure construction of a second layer, the efficiency is high, and the cost is low.
Drawings
Fig. 1 is a schematic diagram of a half-sectional structure of the present invention.
Fig. 2 is an enlarged view of the reverse circulation sand control mechanism at a in fig. 1.
Fig. 3 is an enlarged view of the reverse circulation piston seal mechanism of fig. 1 at B.
Fig. 4 is an enlarged view of the valve plate piston sand control mechanism of fig. 1 at C.
Fig. 5 is an enlarged view of the valve plate mechanism of fig. 1 at D.
Fig. 6 is an enlarged view of the valve plate push cylinder initial fixing mechanism of fig. 1 at E.
Wherein: 1. the sealing device comprises an upper joint, 2, a first O-shaped sealing ring, 3, a first sand-prevention hexagon socket head cap screw, 4, a circulating valve compression spring, 5, a reverse circulation cylinder sleeve, 6, a spring support sleeve, 7, a second O-shaped sealing ring, 8, a third O-shaped sealing ring, 9, a reverse circulation piston, 10, a sealing packing, 11, a fourth O-shaped sealing ring, 12, an intermediate joint, 13, a fifth O-shaped sealing ring, 14, a valve plate cylinder sleeve, 15, a sixth O-shaped sealing ring, 16, a valve plate compression spring, 17, a second sand-prevention hexagon socket head cap screw, 18, a valve plate push cylinder, 19, a seventh O-shaped sealing ring, 20, an eighth O-shaped sealing ring, 21, a ninth O-shaped sealing ring, 22, a lower joint, 23, a valve plate, 24, a tenth O-shaped sealing ring, 25, a shearing pin, 26 and a pin blocking cap
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
The sand-proof temporary blocking valve capable of being repeatedly opened and closed and having the reverse circulation function as shown in fig. 1 to 6 comprises an upper joint 1, a reverse circulation cylinder sleeve 5, a spring support sleeve 6, a circulation valve compression spring 5, a reverse circulation piston 9, a sealing packing 10, an intermediate joint 12, a valve plate compression spring 16, a valve plate push cylinder 18, a valve plate 23 and a lower joint 22, wherein one end of the reverse circulation cylinder sleeve 5 is connected with the upper joint 1, the other end of the reverse circulation cylinder sleeve is connected with one end of the intermediate joint 12, the upper end of the inside of the reverse circulation cylinder sleeve 5 is provided with the circulation valve compression spring 4 and the spring support sleeve 6, the lower end of the inside of the reverse circulation cylinder sleeve is provided with the reverse circulation piston 9 and the sealing packing 10, the other end of the intermediate joint 12 is connected with one end of the valve plate cylinder sleeve 14, the other end of the valve plate cylinder sleeve 14 is connected with the lower joint 22, the middle of the lower joint 22 is provided with the valve plate 23, and the lower part of the lower joint is provided with a shearing pin 25 and a pin blocking cap 26, inside which a valve plate compression spring 16 and a valve plate push cylinder 18 are provided.
In the technical scheme, the lower end of the upper joint 1 is connected with the upper end of the reverse circulation cylinder 5 through threads and is sealed through the first O-shaped sealing ring 2, waist-shaped grooves are uniformly distributed in the middle lower section of the reverse circulation cylinder sleeve 5 to provide a reverse circulation liquid flow channel, and the tail part of the reverse circulation cylinder sleeve is connected with the external threads of the middle joint through threads and is sealed through the second O-shaped sealing ring 7.
In the technical scheme, the upper end face of the spring support sleeve 6 is provided with threads, the bottom of the threads is provided with a cylindrical liquid inlet hole, the spring support sleeve is internally provided with a first sand-prevention inner hexagonal screw 3, the bottom of the first sand-prevention inner hexagonal screw 3 is provided with uniformly-distributed sand filtering holes, the requirement that liquid enters an inner cavity of the reverse circulation cylinder sleeve 5 can be met, sand or other solid-phase particles cannot enter the inner cavity, the purpose of cavity sand prevention is achieved, the rebound mechanism is prevented from being blocked, and the function that the reverse circulation valve can be repeatedly opened is realized.
In the technical scheme, the upper end surface of the compression spring 4 of the circulating valve is contacted with the lower end surface of the upper step of the spring support sleeve 6, the lower end surface of the spring support sleeve 6 is contacted with the upper end surface of the reverse circulation piston 9, and the rebound power storage function of the reverse circulating valve is provided.
In the technical scheme, a third O-shaped sealing ring 8 and a fourth O-shaped sealing ring 11 are respectively arranged in the sealing grooves of the inner wall and the outer wall of the upper end of the reverse circulation piston 9, and the middle lower part of the reverse circulation piston is sealed with the inner wall of the sealing packing 10 through an interference extrusion stroke.
The second O-shaped sealing ring 7 and the third O-shaped sealing ring 8 realize the functions of sliding sealing and sand prevention; the third O type sealing washer 8's of upper end outside downside has little step, and this step can upwards promote it when having pressure to the compression reverse circulation valve compression spring, further the lower extreme of reverse circulation valve can move to the upper end of the equipartition waist type groove of the well lower part of reverse circulation cylinder liner 5, has realized opening of reverse circulation passageway, and reverse circulation valve compression spring 4 can exert the elastic force effect and pushes away reverse circulation piston 9 downwards once more after the pressure release, and reverse circulation passageway closes once more.
In the technical scheme, a plurality of triangular threaded holes are uniformly distributed in the circumference of the middle lower part of the valve plate cylinder sleeve 14, a small-diameter through hole is formed in the hole bottom of each triangular thread, a second sand-prevention inner hexagonal screw 17 with a sand hole is arranged in each triangular threaded hole, the second sand-prevention inner hexagonal screw 17 prevents external solid-phase particles from entering a spring cavity of the middle lower part of the valve plate cylinder sleeve, the valve plate compression spring mechanism is prevented from being blocked, and the energy storage function of a sand-prevention spring is realized.
In the technical scheme, a fifth O-shaped sealing ring 13 is arranged between the intermediate joint 12 and the valve plate cylinder sleeve 14, a sixth O-shaped sealing ring 15 is arranged at the upper part of the valve plate push cylinder 18 and is in stroke sliding seal with the inner wall of the valve plate cylinder sleeve, the valve plate 23 can be pushed open when the valve plate compression spring 16 is compressed to move downwards, a channel is opened, so that fracturing fluid can enter a lower oil pipe and a fractured layer, uniformly distributed holes are formed in the tail end of the valve plate push cylinder to be matched with the shearing pins 25, the shearing pins 25 limit the valve plate push cylinder 18 when the valve plate push cylinder initially enters a well, the valve plate 12 is opened, and fluid is not required to be poured while a pipe column is lowered.
In the above technical solution, a seventh O-ring 19 is disposed between the valve plate cylinder sleeve 14 and the lower joint 12, an eighth O-ring 20 is disposed between the valve plate 23 and the valve plate push cylinder 18, and a ninth O-ring 21 is disposed between the valve plate 23 and the lower joint 22.
The outer surface of the valve plate push cylinder 18 and the ninth O-shaped sealing ring 21 form sliding sealing, a lower hole is formed in the tail of the valve plate push cylinder and is matched with the shearing pin 25, the spring potential energy of the valve plate compression spring 16 in a compression state is locked, the valve plate 23 is kept in an open state when the valve plate is put into a well, after the packer can be set after the valve plate push cylinder is put into a target layer, annular pressure is applied to cut the shearing pin 25, the valve plate push cylinder 18 moves upwards under the action of the resilience force of the valve plate compression spring 16, the torsion spring of the valve plate 23 twists the valve plate clockwise by 90 degrees to form extrusion sealing with vulcanized rubber at the lower end inside the valve plate seat, the higher the lower pressure is, the higher the extrusion force of the valve plate 23 and the vulcanized rubber at the lower end of the valve plate seat is, and the sealing is tight.
In the above technical solution, the lower part of the lower joint 22 is provided with a threaded hole for stroke-fit sealing with the pin block cap 26 and the tenth O-ring 24.
The lower end of the valve plate cylinder sleeve 14 is provided with two threaded holes with different sizes, the smaller one is provided with a shearing pin 25 which is used for being connected with a tail through hole of the valve plate push cylinder 18 to prevent the valve plate push cylinder 18 from moving upwards and fixing the valve plate push cylinder in an initial state of entering a well, and the force value of the shearing pin 25 can be adjusted according to specific construction requirements so as to adjust the initial pressure for closing the valve plate 23.
The working principle of the sand-proof temporary plugging valve is as follows: generally, the pressure of the annular space of the pipe column is controlled by a snubbing operation machine, the pressure in an oil pipe is controlled by a one-way valve plate mechanism and is connected to the upper part of a multi-time setting mechanical packer, a tool string is sent to a target position by the oil pipe, the multi-time setting mechanical packer is firstly set to seal an oil sleeve annular space, low pressure is pumped in the oil sleeve annular space, the pressure acts on the section of a reverse circulation valve and a valve plate push cylinder, the reverse circulation valve cannot be pushed away under the low pressure, the tail shearing pin can be sheared by the two valve plate push cylinder and then moves upwards, the valve plate is automatically closed, after pressure is relieved, the oil pipe pressurizing pressure acts on the valve plate push cylinder, the valve plate push cylinder moves downwards to push away the valve plate again and protect the valve plate, the valve plate is prevented from being washed by liquid flow, the first position is fractured, the oil pipe position is relieved after the pressure is relieved, the valve plate is automatically closed, the pipe column position is lifted up to the second position, and pressure construction is carried out on the first position, the construction purpose of multilayer pressure is realized by repeating the steps.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (9)
1. The utility model provides a can open and shut repeatedly and take sand mould temporary plugging prevention valve of reverse circulation function which characterized by: including top connection, reverse circulation cylinder liner, spring support cover, circulating valve compression spring, reverse circulation piston, sealed packing, intermediate head, valve plate compression spring, valve plate pusher, valve plate and lower clutch, the top connection is connected to reverse circulation cylinder liner one end, and the other end is connected with intermediate head's one end, and the inside upper end department of this reverse circulation cylinder liner is equipped with circulating valve compression spring and spring support cover, and its inside lower extreme department is equipped with reverse circulation piston and sealed packing, the other end of intermediate head is connected with the one end of valve plate cylinder liner, and the other end and the lower clutch of this valve plate cylinder liner are connected, the lower clutch middle part is equipped with the valve plate, and the lower part is provided with shear pin and the stifled cap of pin, and inside is equipped with valve plate compression spring and valve plate pusher.
2. The sand mold temporary blocking prevention valve capable of being repeatedly opened and closed and having a reverse circulation function according to claim 1, which is characterized in that: the lower end of the upper joint is connected with the upper end of the reverse circulation cylinder through threads and is sealed through a first O-shaped sealing ring, waist-shaped grooves are uniformly distributed in the middle lower section of the reverse circulation cylinder sleeve to provide a reverse circulation liquid flow channel, and the tail portion of the reverse circulation cylinder sleeve is connected with the external threads of the middle joint through threads and is sealed through a second O-shaped sealing ring.
3. The sand mold temporary blocking prevention valve capable of being repeatedly opened and closed and having a reverse circulation function according to claim 1, which is characterized in that: the upper end face of the spring support sleeve is provided with threads, the bottom of each thread is provided with a cylindrical liquid inlet hole, a first sand-prevention inner hexagonal screw is arranged in each thread, and the bottom of each first sand-prevention inner hexagonal screw is provided with uniformly distributed sand filtering holes, so that liquid can enter a cavity inside the reverse circulation cylinder sleeve.
4. The sand mold temporary blocking prevention valve capable of being repeatedly opened and closed and having a reverse circulation function according to claim 1, which is characterized in that: the upper end face of a compression spring of the circulating valve is contacted with the lower end face of an upper step of the spring support sleeve, and the lower end face of the spring support sleeve is contacted with the upper end face of the reverse circulation piston.
5. The sand mold temporary blocking prevention valve capable of being repeatedly opened and closed and having a reverse circulation function according to claim 1, which is characterized in that: and a third O-shaped sealing ring and a fourth O-shaped sealing ring are respectively arranged in the sealing grooves of the inner wall and the outer wall of the upper end of the reverse circulation piston, and the middle lower part of the reverse circulation piston is sealed with the inner wall of the sealing packing in an interference extrusion stroke manner.
6. The sand mold temporary blocking prevention valve capable of being repeatedly opened and closed and having a reverse circulation function according to claim 1, which is characterized in that: a plurality of triangular threaded holes are uniformly distributed in the circumference of the middle lower part of the valve plate cylinder sleeve, small-diameter through holes are formed in the hole bottoms of the triangular threads, and second sand-prevention inner hexagon screws with sand filtering holes are arranged in the triangular threaded holes.
7. The sand mold temporary blocking prevention valve capable of being repeatedly opened and closed and having a reverse circulation function according to claim 1, which is characterized in that: and a fifth O-shaped sealing ring is arranged between the intermediate joint and the valve plate cylinder sleeve, and a sixth O-shaped sealing ring and the stroke sliding seal of the inner wall of the valve plate cylinder sleeve are arranged at the upper part of the valve plate push cylinder.
8. The sand mold temporary blocking prevention valve capable of being repeatedly opened and closed and having a reverse circulation function according to claim 1, which is characterized in that: and a seventh O-shaped sealing ring is arranged between the valve plate cylinder sleeve and the lower joint, an eighth O-shaped sealing ring is arranged between the valve plate and the valve plate push cylinder, and a ninth O-shaped sealing ring is arranged between the valve plate and the lower joint.
9. The sand mold temporary blocking prevention valve capable of being repeatedly opened and closed and having a reverse circulation function according to claim 1, which is characterized in that: and the lower part of the lower joint is provided with a threaded hole which is matched and sealed with the pin plug cap and the tenth O-shaped sealing ring in a stroke matching way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220642975.4U CN217080425U (en) | 2022-03-23 | 2022-03-23 | Sand-proof temporary blocking valve capable of being repeatedly opened and closed and having reverse circulation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220642975.4U CN217080425U (en) | 2022-03-23 | 2022-03-23 | Sand-proof temporary blocking valve capable of being repeatedly opened and closed and having reverse circulation function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217080425U true CN217080425U (en) | 2022-07-29 |
Family
ID=82550226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220642975.4U Active CN217080425U (en) | 2022-03-23 | 2022-03-23 | Sand-proof temporary blocking valve capable of being repeatedly opened and closed and having reverse circulation function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217080425U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115653560A (en) * | 2022-11-11 | 2023-01-31 | 中国石油天然气集团有限公司 | Horizontal well single upper seal pipe column sand filling staged fracturing implementation method |
-
2022
- 2022-03-23 CN CN202220642975.4U patent/CN217080425U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115653560A (en) * | 2022-11-11 | 2023-01-31 | 中国石油天然气集团有限公司 | Horizontal well single upper seal pipe column sand filling staged fracturing implementation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2121002A (en) | Cement retainer and bridge plug for well casings | |
| CN109751011B (en) | Hot-washing paraffin removal packer | |
| CN107542433A (en) | A kind of pressure sliding sleeve controls formula gas well continuous drainage gas production plunger | |
| CN109236189A (en) | A kind of downhole drill reamer | |
| CN217080425U (en) | Sand-proof temporary blocking valve capable of being repeatedly opened and closed and having reverse circulation function | |
| CN106939777A (en) | A kind of well blowout preventing packer | |
| CN104763371B (en) | Free downslide tubing plug and its application method can be dragged for | |
| CN104196492B (en) | A kind of dragging down-hole plugging valve with pressure | |
| CN103388469A (en) | Filling tool | |
| CN103742099A (en) | Perforation, fracturing, sealing and separating device | |
| CN108798615B (en) | Separate injection well completion pipe string of water injection well and snubbing well completion process | |
| CN206830131U (en) | Sand setting constant pressure check valve for water injection well | |
| CN113445962A (en) | Hydraulic double-layer pipe double-gradient downhole blowout prevention valve | |
| CN204941345U (en) | A kind of radial well transfer with packing function | |
| CN204163679U (en) | Multifunctional high pressure tubing plug | |
| CN109025897B (en) | An in-well foaming volume plugging device | |
| CN109098684B (en) | Expansion type bottom sealing dragging fracturing packer and construction method thereof | |
| CN114673477A (en) | Sand mold temporary blocking prevention valve capable of being repeatedly opened and closed and having reverse circulation function | |
| CN117287171A (en) | Fracturing sand control production integrated tubular column structure | |
| CN114562199B (en) | Cement leaking stoppage bores stopper integrated underground device | |
| CN113863888B (en) | Underground three-channel integrated blowout preventer for double-tube drilling | |
| CN110566450B (en) | Hydraulic control blowout prevention device for oil pipe under pump | |
| RU64682U1 (en) | DEVICE FOR INSTALLATION AND SEALING OF A HOLE OF A CASING HOLE IN A WELL | |
| CN212454391U (en) | High-pressure testing well opening device | |
| CN204357412U (en) | Casing sliding sleeve capable of being repeatedly closed |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |