CN107605430B - A kind of well cementation anti-return self balancing device - Google Patents
A kind of well cementation anti-return self balancing device Download PDFInfo
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- CN107605430B CN107605430B CN201710860272.2A CN201710860272A CN107605430B CN 107605430 B CN107605430 B CN 107605430B CN 201710860272 A CN201710860272 A CN 201710860272A CN 107605430 B CN107605430 B CN 107605430B
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Abstract
The invention belongs to petroleum, natural gas completion technique field, disclose a kind of well cementation anti-return self balancing device, are divided into plugging mechanism, resetting-mechanism, pressure difference mechanism three parts, and wherein plugging mechanism is used for anti-return, are mainly made of piston；Resetting-mechanism is mainly used to limit piston position, prevents play, including stop collar, spring；Pressure difference mechanism is mainly used to establish circulation canal and establishes pressure difference, is made of top connection, central tube, housing, injection pipe nipple, plug.The present invention is in well cementing operation, by applying operational pressure, liquid enters long narrow shape annulus access between central tube and housing by top connection flow channel entry point after central tube, injection pipe nipple, generate friction drag loss, to which liquid forms pressure difference in annulus access between center liquid in pipe and central tube, housing, it pushes piston to move up closing volume channel, solves cement slurry reflux problem, guarantee that operation safety is reliable.
Description
Technical field
The invention belongs to petroleum, natural gas completion technique field, in particular to a kind of for sand control one of cementing the well
The anti-return self-balancing mechanism of change technology.
Background technique
With deepening continuously for Bohai Bay Oil petroleum exploration and development, the transformation and reconditioning of old well are imperative.Land grand celebration,
Shengli Oil Field has in the former successful experience of straight well wellbore the Short-radius Horizontal Sidetracking, and is drilled well for marine sidetracking short radius
Technology or a blank.According to operation on the sea feature and the land prior art, to cementing the well, sand prevention integrated key technology is carried out
Research, so that the technology is at sea promoted and applied, become Bohai Bay Oil further tap the latent power, stable yields, volume increase effective conventional means.
The currently used sand prevention integrated technology of well cementation, carries out sand control in lower part target zone first, upper layer position is consolidated
There is well cementation section cement slurry during well cementing operation to sand control section reflux risk in well operations.
Summary of the invention
Present invention seek to address that the cement slurry reflux problem in sand prevention integrated technology of cementing the well, and it is anti-to provide a kind of well cementation use
Flow back self balancing device, and using principle of differential pressure, closing liquid return flow line prevents cement slurry from flowing back, and guarantees that operation safety is reliable.
In order to solve the above-mentioned technical problem, the present invention is achieved by technical solution below:
A kind of well cementation anti-return self balancing device, the top connection being connect including the upper end with drilling rod (1), the top connection
(1) lower part is disposed with the first threaded hole (101) and the second threaded hole (102) from top to bottom, and in the first threaded hole (101)
Diameter is less than the second threaded hole (102) internal diameter；The top connection (1) is connected central tube (2) and close by the first threaded hole (101)
Envelope, the top connection (1) is by the second threaded hole (102) connection housing (3) and seals；The central tube (2) and the housing
(3) annulus access of long narrow shape is formed between；Top connection (1) lower circumference symmetrically offers radial through-hole formation runner and enters
Mouth (103), the flow channel entry point (103) are connected to the annular space between central tube (2) and housing (3)；
Central tube (2) lower end is free end；Housing (3) lower thread is connected with injection pipe nipple (4) and seals,
Injection pipe nipple (4) top section and the central tube (2) form annulus access；Injection pipe nipple (4) circumference is symmetrically set
It is equipped with and passes to external notch (401) by its inner hole；The tube body of injection pipe nipple (4) is axially disposed to be had and several does not pass through upwards
The long hole (402) for leading to and penetrating through downwards, and it is non-intersecting with the notch (401) that the long hole (402), which is radially disposed,；
Each of injection pipe nipple (4) long hole (402) is machined with the aperture for being connected to injection pipe nipple (4) inner hole radially inward
(403), the aperture (403) constitutes annulus access and the injection pipe nipple between the central tube (2) and the housing (3)
(4) the runner between long hole (402)；
Restraining position ring block (5) are installed in annular space between the central tube (2) and injection pipe nipple (4), the stop collar
(5) it is limited by the housing (3) bottom end end face and the preset limiting slot of the injection pipe nipple (4)；The stop collar (5) two
End is machined with ring cross-section through-hole between end face, is used for annulus access and institute between the central tube (2) and the housing (3)
Annular space between central tube (2) and the injection pipe nipple (4) is stated to be connected；Spring (6), institute are installed below the stop collar (5)
Spring (6) is stated to be mounted between the central tube (2) and the injection pipe nipple (4) in annular space, be compressed in the stop collar (5) and
Between piston (7)；
The surface of revolution has diameter shrinkage part in injection pipe nipple (4) middle section, which forms confined planes, be used for
Position the piston (7)；The diameter shrinkage part lower part is connected through a screw thread plug (8) and seals, and the plug (8) is to the injection
Pipe nipple (4) inner hole, which is realized, to be blocked, while having annular space simultaneously between the outer surface of revolution of the plug (8) and the injection pipe nipple (4)
And the annular space is connected with the long hole (402)；
The piston (7) is mounted between the central tube (2) and the injection pipe nipple (4) in annular space, the piston (7)
Upper surface is contacted with the spring (6), and piston (7) lower end surface is limited by the upper surface of described injection pipe nipple (4) diameter shrinkage part
Position；The outer surface of revolution of the piston (7) is machined with two groups of seal grooves up and down, passes through installation sealing ring and the injection pipe nipple
(4) sealing is formed；The interior surface of revolution of the piston (7) is machined with one group of seal groove, passes through installation sealing ring and the center
It manages (2) and forms sealing；The piston (7) is in the upper end face contact of its lower end surface and described injection pipe nipple (4) diameter shrinkage part, position
Below the aperture (403) of injection pipe nipple (4), not formed closure；The piston (7) moves up being under pressure
The aperture (403) of injection pipe nipple (4) can be blocked afterwards, and is sealed by upper and lower two groups of sealing rings；
Operational pressure is applied by drilling rod when well cementing operation, fluid successively passes through the top connection (1) inner hole, the center
(2) inner hole is managed to the central tube (2) lower end surface and the piston (7) lower end surface, so far forms the device high-pressure area；Fluid
Successively pass through the top connection (1) inner hole, the central tube (2) inner hole, injection pipe nipple (4) inner hole, then by described
Notch (401) outflow for spraying pipe nipple (4) enters annular space between the present apparatus and casing, using the stream of the top connection (1)
Road entrance (103) enters annulus access, the stop collar (5), the center between the central tube (2) and the housing (3)
Annular space between (2) and the injection pipe nipple (4) is managed, until the piston (7) upper surface, forms the device area of low pressure；Due to
Upper and lower end face pressure difference pushes the piston (7) to be moved upward, and closes the aperture (403) of injection pipe nipple (4), prevents water
Mud reflux point danger；After stopping circulation, the piston (7) resets under the action of the spring (6) restoring force, opens the spray
Penetrate the aperture (403) of pipe nipple (4).
Central tube (2) lower end surface is provided with the first diversion trench (201) of even circumferential distribution.
The piston (7) is provided with the second diversion trench (701) of even circumferential distribution.
Piston (7) surfaces externally and internally uses Carburization Treatment.
The notch (401) the case-carbonizing processing of injection pipe nipple (4).
The beneficial effects of the present invention are:
For the present invention in well cementing operation, by applying operational pressure, liquid passes through top connection after central tube, injection pipe nipple
Flow channel entry point enters longer annulus access between central tube and housing, friction drag loss is generated, thus center liquid in pipe
Liquid forms pressure difference in annulus access between central tube, housing, and piston is pushed to move up closing volume channel, solves cement
Reflux problem is starched, guarantees that operation safety is reliable.The present invention not only can be applicable in well cementation sand control treatment technique, can be also used for it
It needs to close in the operation of annular fiowpath.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of well cementation anti-return self balancing device provided by the present invention；
Fig. 2 is the structural schematic diagram of top connection；
Fig. 3 is the structural schematic diagram of central tube；
Fig. 4 is the structural schematic diagram of housing；
Fig. 5 is the structural schematic diagram for spraying pipe nipple；
Fig. 6 is the structural schematic diagram of stop collar；
Fig. 7 is the structural schematic diagram of plug；
Fig. 8 is the structural schematic diagram of piston；
Fig. 9 is that the pressure difference of well cementation anti-return self balancing device provided by the present invention forms schematic diagram；
In above-mentioned figure: 1, top connection, the 101, first threaded hole, the 102, second threaded hole, 103, flow channel entry point；2, center
Pipe, the 201, first diversion trench；3, housing；4, pipe nipple, 401, notch, 402, long hole, 403, aperture are sprayed；5, stop collar；6, bullet
Spring；7, piston, the 701, second diversion trench；8, plug.
Specific embodiment
For that can further appreciate that the contents of the present invention, feature and effect, the following examples are hereby given, and cooperates attached drawing detailed
It is described as follows:
As shown in Figure 1, present embodiments providing a kind of well cementation anti-return self balancing device, including top connection 1, central tube
2, housing 3, injection pipe nipple 4, stop collar 5, spring 6, piston 7, plug 8, are divided into plugging mechanism, resetting-mechanism, pressure difference mechanism three
Most of, wherein plugging mechanism is used for anti-return, is mainly made of piston 7；Resetting-mechanism be mainly used to limit 7 position of piston,
Prevent play, including stop collar 5, spring 6；Pressure difference mechanism is mainly used to establish circulation canal and establishes pressure difference, by top connection 1,
Central tube 2, housing 3, injection pipe nipple 4, plug 8 form.
As shown in connection with fig. 2,1 top of top connection is provided with API drilling rod box thread, for being connected with drilling rod；Lower part setting
There are two layers of threaded hole, respectively the first threaded hole 101 and the second threaded hole 102.First threaded hole 101 is used to connect central tube 2,
Second threaded hole 102 is located at 102 top of the second threaded hole, and the first threaded hole 101 for connecting housing 3, the first threaded hole 101
Internal diameter is less than 102 internal diameter of the second threaded hole, so as to it is provided with annular space between the surface of revolution in the outer surface of revolution of central tube 2 and housing 3, in
Annular space is long and narrow to form second of mill damping consumption between heart pipe 2 and housing 3.Top connection 1 is in the first threaded hole 101 and the second spiral shell
There are two 8mm radial through-hole to form flow channel entry point 103 for position circumference symmetrical machining between pit 102, and flow channel entry point 103 is inside
Annular space between central tube 2 and housing 3 is connected to, the annular space outward between top connection 1 and casing is connected to.The work of top connection 1
With being each independent external unit of concatenation, it is filled with each external unit completion group and meets operation technique requirement.
2 upper end of central tube is connect with the first threaded hole 101 of 1 lower part of top connection, and is sealed by a seal ring.In conjunction with
Shown in Fig. 3,2 lower end of central tube is free end, and lower end surface is arranged there are four the first diversion trench 201 of even circumferential distribution,
With the area of passage of lifting fluid to greatest extent.
As shown in connection with fig. 4,3 upper end of housing is connect with the second threaded hole 102 of 1 lower part of top connection, and by sealing ring into
Row sealing.3 lower end of housing is provided with male thread, connect with injection 4 threaded upper ends of pipe nipple, and be sealed by a seal ring.
As shown in connection with fig. 5, injection 4 circumference of pipe nipple be symmetrical arranged there are two width be 15mm notch 401, notch 401 by
Injection 4 inner hole of pipe nipple is connected to outside injection pipe nipple 4, and 401 case-carbonizing of notch is handled, and notch 401 can produce for the first time
Grind damping consumption.The tube body of injection pipe nipple 4 is machined with the long hole 402 that eight diameters are 8mm, length is 250mm, the long hole along axial direction
402 injection 4 top of pipe nipple do not penetrate through and lower part penetrate through to injection 4 bottom surface of pipe nipple.Radially, eight long holes 402 are arranged as
It is non-intersecting with notch 401.Each long hole 402 of injection pipe nipple 4 is radially inwardly machined with the aperture 403 that diameter is 6mm,
Aperture 403 is connected to injection 4 inner hole of pipe nipple, to constitute the long hole 402 of annular space and injection pipe nipple 4 between central tube 2 and housing 3
Between runner.The runner that the long hole 402 of injection pipe nipple 4 and aperture 403 are composed during non-well cementing operation can balance
Under existing pressure difference, establish anti-suction channel, during well cementation, the channel by pressure difference realize close, avoid because cement slurry paddle flow back
Caused by internal layer tubing string solidify and the risk of the outer operation failure of lower layer.
Injection 4 upper end of pipe nipple is provided with box thread, connect and is sealed by a seal ring with 3 lower end of housing.It sprays short
The 4 interior surface of revolution below its box thread of section is provided with limiting slot to install stop collar 5, the centrally disposed pipe 2 of stop collar 5 with
It sprays in the annular space between pipe nipple 4, and upper and lower ends pass through 3 bottom end end face of housing respectively and spray the limiting slot limit of pipe nipple 4.
As shown in connection with fig. 6, it is machined with ring cross-section through-hole between 5 both ends end face of stop collar, be used for ring between central tube 2 and housing 3
Fluid, which is crossed, in sky flow to annular space between central tube 2 and injection pipe nipple 4.Spring 6 is installed, 6 upper end of spring is supported below stop collar 5
In the lower end surface of stop collar 5,6 lower end of spring is resisted against the upper surface of piston 7.The reset of piston 7 may be implemented in 6 pretightning force of spring
Movement.
Spraying the surface of revolution in 4 middle section of pipe nipple has diameter shrinkage part, which forms confined planes, for installing work
Plug 7；The diameter shrinkage part lower part is provided with box thread, for connecting plug 8, and spray pipe nipple 4 and 8 junction of plug pass through it is close
Seal sealing, 8 structure of plug are as shown in Figure 7.4 inner hole lower end of pipe nipple is sprayed to be blocked by the realization of plug 8, and the outer revolution of plug 8
Face and injection 4 spout of pipe nipple form annular space, while the annular section is connected with the long hole 402 of injection pipe nipple 4.
In annular space between the centrally disposed pipe 2 of piston 7 and injection pipe nipple 4,7 upper surface of piston is contacted with spring 6, piston
7 lower end surfaces are limited by the upper surface of 4 diameter shrinkage part of injection pipe nipple.As shown in connection with fig. 9, piston 7 is ring-type, outer surface of revolution processing
There are two groups of seal grooves up and down, is formed and sealed by installation sealing ring and injection pipe nipple 4；Its interior surface of revolution be machined with one group it is close
Seal slot is formed by installation sealing ring and central tube 2 and is sealed.7 lower end surface even circumferential of piston arrangement is 5mm there are four width
The second diversion trench 701,201 collective effect of the first diversion trench of the second diversion trench 701 and central tube 2, to be promoted to greatest extent
The area of passage of fluid.Piston 7 is located at injection pipe nipple 4 in the upper end face contact of its lower end surface and injection 4 diameter shrinkage part of pipe nipple
The lower section of aperture 403, not formed closure；Piston 7 be under pressure move up after can block injection pipe nipple 4 aperture 403,
And sealed by upper and lower two groups of sealing rings, closing volume channel prevents cement slurry from flowing back.7 surfaces externally and internally of piston is using at carburizing
Reason, surface peening, to reduce the abrasion in 7 reciprocatory movement of piston.
Well cementation of the invention anti-return self balancing device, assemble sequence are as follows: now by the installation of piston 7 to injection pipe nipple
Spring 6, stop collar 5 on earth, after confirmation position is correct, are successively installed in the upper surface of 4 diameter shrinkage parts, after stop collar 5 is installed in place,
The upper surface that 2 bottom end of central tube is imported injection 4 diameter shrinkage part of pipe nipple on earth, then connects housing 3 and injection pipe nipple 4, center
Pipe 2 and housing 3 are connect with top connection 1, and plug 8 is blocked in injection pipe nipple 4,
As shown in figure 9, well cementation of the invention anti-return self balancing device, the course of work are as follows:
In well cementing operation, operational pressure is applied by drilling rod, fluid successively passes through 1 inner hole of top connection, in central tube 2
Hole, the first diversion trench 201 of 2 lower end surface of central tube, 7 lower end surface of piston the second diversion trench 701, so far form the device high pressure
Region；Fluid successively passes through 1 inner hole of top connection, 2 inner hole of central tube, injection 4 inner hole of pipe nipple, using the notch of injection pipe nipple 4
401 outflows generate mill damping consumption for the first time, then enter annular space between the present apparatus and casing, using two runners of top connection 1
The length that entrance 103 enters between the 3 internal diameter 50mm of central tube 2 and housing of outer diameter 40mm is that (annular space is logical for 1800mm annulus access
Road length and above-mentioned inside/outside diameter size need to be determined according to required pressure difference), and friction drag pressure consumption is generated in the process, until
7 upper surface of piston forms the device area of low pressure.In this way, the upper and lower end face of piston 7 pushes piston 7 to move upwards due to pressure difference
It is dynamic, the aperture 403 of injection pipe nipple 4 is closed, cement slurry reflux risk is solved, guarantees that operation safety is reliable.
In cyclic process, piston 7 closes the circulation canal of injection pipe nipple 4 always, and compresses to spring 6；Stop
After circulation, piston 7 resets under the action of 6 restoring force of spring, opens the circulation canal on injection pipe nipple 4.
Although the preferred embodiment of the present invention is described above in conjunction with attached drawing, the invention is not limited to upper
The specific embodiment stated, the above mentioned embodiment is only schematical, be not it is restrictive, this field it is common
Technical staff under the inspiration of the present invention, can be with when not departing from invention objective and scope of the claimed protection
The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.
Claims (5)
1. a kind of well cementation anti-return self balancing device, the top connection being connect including the upper end with drilling rod (1), which is characterized in that
Top connection (1) lower part is disposed with the first threaded hole (101) and the second threaded hole (102), and the first spiral shell from top to bottom
Pit (101) internal diameter is less than the second threaded hole (102) internal diameter；The top connection (1) connects center by the first threaded hole (101)
Pipe (2) simultaneously seals, and the top connection (1) is by the second threaded hole (102) connection housing (3) and seals；The central tube (2) with
The annulus access of long narrow shape is formed between the housing (3)；Top connection (1) lower circumference symmetrically offers radial through-hole shape
At flow channel entry point (103), which is connected to the annular space between central tube (2) and housing (3)；
Central tube (2) lower end is free end；Housing (3) lower thread is connected with injection pipe nipple (4) and seals, described
It sprays pipe nipple (4) top section and the central tube (2) forms annulus access；Injection pipe nipple (4) circumference is symmetrically arranged with
External notch (401) is passed to by its inner hole；It is described injection pipe nipple (4) tube body it is axially disposed have it is several upwards do not penetrate through and
The long hole (402) penetrated through downwards, and it is non-intersecting with the notch (401) that the long hole (402), which is radially disposed,；It is described
Each of injection pipe nipple (4) long hole (402) is machined with the aperture for being connected to injection pipe nipple (4) inner hole radially inward
(403), the aperture (403) constitutes annulus access and the injection pipe nipple between the central tube (2) and the housing (3)
(4) the runner between long hole (402)；
The central tube (2) and it is described injection pipe nipple (4) between annular space in install restraining position ring block (5), the stop collar (5) by
Housing (3) the bottom end end face and the preset limiting slot of the injection pipe nipple (4) are limited；Stop collar (5) the both ends end
Ring cross-section through-hole is machined between face, for by annulus access between the central tube (2) and the housing (3) and it is described in
Annular space is connected between heart pipe (2) and the injection pipe nipple (4)；Spring (6), the bullet are installed below the stop collar (5)
Spring (6) is mounted between the central tube (2) and the injection pipe nipple (4) in annular space, is compressed in the stop collar (5) and piston
(7) between；
The surface of revolution has diameter shrinkage part in injection pipe nipple (4) middle section, which forms confined planes, for positioning
The piston (7)；The diameter shrinkage part lower part is connected through a screw thread plug (8) and seals, and the plug (8) is to the injection pipe nipple
(4) inner hole, which is realized, blocks, while having annular space between the outer surface of revolution of the plug (8) and the injection pipe nipple (4) and being somebody's turn to do
Annular space is connected with the long hole (402)；
The piston (7) is mounted between the central tube (2) and the injection pipe nipple (4) in annular space, piston (7) upper end
Face is contacted with the spring (6), and piston (7) lower end surface is limited by the upper surface of described injection pipe nipple (4) diameter shrinkage part；Institute
The outer surface of revolution for stating piston (7) is machined with two groups of seal grooves up and down, passes through installation sealing ring and injection pipe nipple (4) shape
At sealing；The interior surface of revolution of the piston (7) is machined with one group of seal groove, passes through installation sealing ring and the central tube (2)
Form sealing；The piston (7) is located at institute in the upper end face contact of its lower end surface and described injection pipe nipple (4) diameter shrinkage part
Below the aperture (403) for stating injection pipe nipple (4), not formed closure；The piston (7) be under pressure move up after can
To block the aperture (403) of injection pipe nipple (4), and sealed by upper and lower two groups of sealing rings；
Operational pressure is applied by drilling rod when well cementing operation, fluid successively passes through the top connection (1) inner hole, the central tube
(2) inner hole so far forms the device high-pressure area to the central tube (2) lower end surface and the piston (7) lower end surface；Fluid according to
It is secondary to pass through the top connection (1) inner hole, the central tube (2) inner hole, injection pipe nipple (4) inner hole, then pass through the spray
Notch (401) outflow for penetrating pipe nipple (4) enters annular space between the present apparatus and casing, using the runner of the top connection (1)
Entrance (103) enters annulus access, the stop collar (5), the central tube between the central tube (2) and the housing (3)
(2) annular space between the injection pipe nipple (4), until the piston (7) upper surface, forms the device area of low pressure；Due to it is upper,
Lower end surface pressure difference pushes the piston (7) to be moved upward, and closes the aperture (403) of injection pipe nipple (4), prevents cement slurry
Reflux point danger；After stopping circulation, the piston (7) resets under the action of the spring (6) restoring force, and it is short to open the injection
Save the aperture (403) of (4).
2. a kind of well cementation anti-return self balancing device according to claim 1, which is characterized in that the central tube (2)
Lower end surface is provided with the first diversion trench (201) of even circumferential distribution.
3. a kind of well cementation anti-return self balancing device according to claim 1, which is characterized in that the piston (7) sets
It is equipped with the second diversion trench (701) of even circumferential distribution.
4. a kind of well cementation anti-return self balancing device according to claim 1, which is characterized in that in the piston (7)
Outer surface uses Carburization Treatment.
5. a kind of well cementation anti-return self balancing device according to claim 1, which is characterized in that the injection pipe nipple
(4) the notch (401) case-carbonizing processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710860272.2A CN107605430B (en) | 2017-09-21 | 2017-09-21 | A kind of well cementation anti-return self balancing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710860272.2A CN107605430B (en) | 2017-09-21 | 2017-09-21 | A kind of well cementation anti-return self balancing device |
Publications (2)
| Publication Number | Publication Date |
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| CN107605430A CN107605430A (en) | 2018-01-19 |
| CN107605430B true CN107605430B (en) | 2019-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710860272.2A Active CN107605430B (en) | 2017-09-21 | 2017-09-21 | A kind of well cementation anti-return self balancing device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111911085B (en) * | 2019-05-10 | 2022-07-01 | 中国石油化工股份有限公司 | Pipe column for opening reservoir |
| CN111456681B (en) * | 2020-06-08 | 2022-02-22 | 西南石油大学 | Double-layer in-pipe blowout prevention valve |
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| CN2061206U (en) * | 1989-08-25 | 1990-08-29 | 四川省石油管理局川东钻探公司 | Self-injecting mud back-pressure valve |
| RU2344271C1 (en) * | 2007-03-22 | 2009-01-20 | Сергей Владимирович Терентьев | Device for stepwise cementing of tail piece |
| CN103225493A (en) * | 2013-04-10 | 2013-07-31 | 中国石油集团长城钻探工程有限公司 | Backflow preventing device for well cementation |
| CN203867463U (en) * | 2014-03-05 | 2014-10-08 | 尹博 | Short section for lowering casing pipe without filling drilling fluid for oil drilling |
| CN206233898U (en) * | 2016-11-12 | 2017-06-09 | 王保明 | A kind of one-way valve on wellhead of oil prodn. well |
| CN106979003A (en) * | 2017-05-09 | 2017-07-25 | 中国海洋石油总公司 | A kind of downhole instrument bypass type balanced structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9605510B2 (en) * | 2014-06-25 | 2017-03-28 | Robert Grainger | Non-rotating connector for wellbore cementing tool |
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- 2017-09-21 CN CN201710860272.2A patent/CN107605430B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2061206U (en) * | 1989-08-25 | 1990-08-29 | 四川省石油管理局川东钻探公司 | Self-injecting mud back-pressure valve |
| RU2344271C1 (en) * | 2007-03-22 | 2009-01-20 | Сергей Владимирович Терентьев | Device for stepwise cementing of tail piece |
| CN103225493A (en) * | 2013-04-10 | 2013-07-31 | 中国石油集团长城钻探工程有限公司 | Backflow preventing device for well cementation |
| CN203867463U (en) * | 2014-03-05 | 2014-10-08 | 尹博 | Short section for lowering casing pipe without filling drilling fluid for oil drilling |
| CN206233898U (en) * | 2016-11-12 | 2017-06-09 | 王保明 | A kind of one-way valve on wellhead of oil prodn. well |
| CN106979003A (en) * | 2017-05-09 | 2017-07-25 | 中国海洋石油总公司 | A kind of downhole instrument bypass type balanced structure |
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| Publication number | Publication date |
|---|---|
| CN107605430A (en) | 2018-01-19 |
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