CN109184611A - Four ram preventer of coiled tubing, half seal apparatus - Google Patents
Four ram preventer of coiled tubing, half seal apparatus Download PDFInfo
- Publication number
- CN109184611A CN109184611A CN201810996159.1A CN201810996159A CN109184611A CN 109184611 A CN109184611 A CN 109184611A CN 201810996159 A CN201810996159 A CN 201810996159A CN 109184611 A CN109184611 A CN 109184611A
- Authority
- CN
- China
- Prior art keywords
- coiled tubing
- expandable
- rubber tube
- dashpot
- blowout preventer
- 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.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
- E21B33/061—Ram-type blow-out preventers, e.g. with pivoting rams
Abstract
The present invention relates to a kind of four ram preventer of coiled tubing, half seal apparatus.Its technical solution is: the center installation Expandable of blowout preventer body partly seals rubber tube, tail portion is fixed on blowout preventer body from lock end by rubber opening pressing ring, form annular cavity, the fixed half envelope sprawl and control block in the outside of blowout preventer body, inside is equipped with an oil inlet dashpot and a fuel-displaced dashpot, and oil inlet dashpot is corresponding with half envelope rubber tube of the Expandable of blowout preventer body.Beneficial effect is: it is an overall structure that Expandable half, which seals rubber tube, it is fixed in the shaped cavity of blowout preventer body by rubber opening pressing ring, when use, it can realize that Expandable half seals rubber tube and is self-locking on blowout preventer body by suppressing, the other side, which is then expanded, contacts sealing with the outer wall of coiled tubing, and the pressure of inside and outside gas or liquid realizes mutually balance, it is not easy to leak, using more reliable, its service life is extended.
Description
Technical field
The present invention relates to a kind of four ram preventer of coiled tubing, in particular to a kind of four ram preventer of coiled tubing half
Seal apparatus.
Background technique
In the work progress of coiled tubing, 4FZ preventer, that is, four ram preventers, one kind must be installed
Safety device, in this arrangement, half envelope are the most important safety devices in work progress, and existing half seals
Device, referring to Chinese patent literature Publication No. 201915889U, patent name is half that " four ram preventer of hydraulic control " is mentioned
Seal apparatus: one and half envelope flashboards are symmetrically fixed on the front end of two and half envelope pistons, two and half envelope pistons point by two piston rods
Wei Yu not be in two and half sealing liquid cylinders, the lower end that two and half sealing liquid cylinders are symmetrically immobilized in the shell, under two suspension fluid cylinders
Side.In use, when thering is oil pipe to pass through in preventer, from crossover sub from hydraulic fluid port beaten to the rear end of the piston in half sealing liquid cylinder
Hydraulic oil (highest controls pressure 21MPa), it is mobile to realize semiclosed well to wellbore center that piston will push half envelope flashboard
Mouthful；When the hydraulic fluid port from crossover sub beats hydraulic oil (highest control pressure to the front end of the piston in half sealing liquid cylinder
21MPa), piston will pull half envelope flashboard and open well head far from wellbore center.Itself the problem is that: first is that coiled tubing exists
Diameter contracting phenomenon is stretched in use, will appear back and forth for a long time, that is, diameter diminution, and the diameter for partly sealing flashboard will not be with
Variation, results in poorly sealed situation in this way.Second is that half seals flashboard can be because of coiled tubing in work progress with pressure
It moves up and down and causes hard friction, make its rapid failure.Third is that during construction operation, since the most inner side of half envelope flashboard is equipped with
Rubber, which is used to contact realization sealing with the outer wall of coiled tubing, but accidentally can in operation due to artificial origin
Half envelope flashboard rubber outstanding is touched off, the failure of half seal apparatus is caused.
Summary of the invention
The purpose of the present invention is to drawbacks described above of the existing technology, provide a kind of four flashboard blowout prevention of coiled tubing
The sealing means of compression are changed to the sealing of expanding by half seal apparatus of device, and half envelope rubber tube of the Expandable used is usual
In contraction state, it will not be encountered in construction operation above and below coiled tubing, avoid artificial damage；In addition, Expandable half seals
Rubber tube is flexible, it is possible to which the coiled tubing reduced with diameter is combined closely sealing；The liquid entered by control
It presses dynamically to adjust the deformation that Expandable half seals between rubber tube and coiled tubing, to reduce hard grind wiping.
Four ram preventer of a kind of coiled tubing, half seal apparatus that the present invention mentions, technical solution is: expanding including half envelope
Control block (1), blowout preventer body (2), rubber opening pressing ring (3), disengaging hydraulic interface (4), Expandable partly seal rubber tube
(5), sealing rubber ring (6), safety valve carrier (7), steel ball (8), level pressure spring (9), pressure regulation pressure cap (10), oil discharge passage are connected
(11), the center installation Expandable of sealing joint cushion rubber (12), oil inlet passage (13), the blowout preventer body (2) partly seals rubber
Packing element (5), the Expandable partly seal the tail portion of rubber tube (5) from lock end by rubber opening pressing ring (3) be fixed on blowout prevention
On device ontology (2), annular cavity is formed, the outside of the blowout preventer body (2) passes through bolt (14) fixed half envelope expansion control
The inside of clamp dog (1), half envelope sprawl and control block (1) is equipped with an oil inlet dashpot (1.1) and a fuel-displaced dashpot
(1.2), and oil inlet dashpot (1.1) and the Expandable of blowout preventer body (2) partly seal rubber tube (5) it is corresponding, and with can expand
Open the annular cavity connection that formula partly seals rubber tube (5) formation；The outer end of oil inlet dashpot (1.1) connects oil inlet passage (13),
Oil inlet passage (13) connects disengaging hydraulic interface (4) outside, and the outer end of fuel-displaced dashpot (1.2) connects oil discharge passage (11), and goes out
Safety valve carrier (7) are equipped in oily dashpot (1.2), are equipped with steel ball (8) in safety valve carrier (7), the outside of steel ball (8) connects
The outside of level pressure spring (9), level pressure spring (9) connects pressure regulation pressure cap (10).
Preferably, it includes setting expansion side (5.1), lower unidirectional seal gap that above-mentioned Expandable, which partly seals rubber tube (5),
(5.2), lower anticreep extend out arm (5.3), under from lock end (5.4), upper one-way sealing notch (5.5), upper anticreep extend out arm (5.6),
On from lock end (5.7), the two sides up and down for setting expansion side (5.1) are respectively equipped with one-way sealing notch (5.5) and place an order
To seal gap (5.2), and upside is equipped with the upper anticreep upwardly extended and extends out arm (5.6), and downside is lower anti-equipped with what is extended downwardly
De- to extend out arm (5.3), the upper anticreep extends out in arm (5.6) connection from lock end (5.7), and lower anticreep extends out under arm (5.3) connection
From lock end (5.4).
Preferably, the above-mentioned section for setting the side that expansion side (5.1) is contacted with coiled tubing is arcuate structure, another
The section of side is planar structure.
Preferably, the above-mentioned section for setting the side that expansion side (5.1) is contacted with coiled tubing is arcuate structure, another
The section of side is the protrusion arc structure for being conducive to rebound.
Preferably, above-mentioned expansion side (5.1) that sets is three stage structure, and the section of the side contacted with coiled tubing is
Arcuate structure, planar structure and three sections of arcuate structure compositions, intermediate one section is planar structure.
Preferably, above-mentioned lower anticreep extends out arm (5.3) and is equipped with thickening layer with the junction for setting expansion side (5.1)；On
Anticreep extends out arm (5.6) and is equipped with thickening layer with the junction for setting expansion side (5.1).
Preferably, it is above-mentioned it is lower from lock end (5.4) and on from lock end (5.7) be respectively equipped with convolution protrusion.
Preferably, the center of above-mentioned blowout preventer body (2) is equipped with the circle that rubber tube (5) cooperation is partly sealed with Expandable
Cavity, and the upside of circular cavity is equipped with upper shaped cavity, downside is equipped with lower shaped cavity；And pass through blowout preventer body (2) two
The connecting hole that side is equipped with is respectively communicated with oil inlet dashpot (1.1) and fuel-displaced dashpot (1.2).
Preferably, the inlet side of above-mentioned upper shaped cavity is equipped with protrusion, and the other side is arcuate structure, and raised is interior
Side and Expandable partly seal cooperating from lock end for rubber tube (5), and high spot is arranged rubber and is open pressing ring (3)；The arc of the other side
The upper anticreep that structure and Expandable partly seal rubber tube (5) extends out arm (5.6) cooperation.
The beneficial effects of the present invention are: the sealing means of compression are changed to the sealing of expanding by the present invention, and use
Expandable half seals rubber tube and is in contraction state usually, and oil pipe will not be encountered in upper and lower construction operation, avoid artificial damage；
In addition, it is flexible that Expandable half, which seals rubber tube, it is possible to which the coiled tubing reduced with diameter is combined closely sealing；
By control enter it is hydraulic dynamically adjust the deformation that Expandable half seals between rubber tube and coiled tubing, to reduce
The problem of hard grind is wiped, and the failure of half envelope is avoided；In addition, maintenance is convenient, before use, can simply be sentenced by external light source
Disconnected Expandable out half seals the wear condition of rubber tube；
The Expandable that the present invention uses half seals rubber tube as an overall structure, is fixed in by rubber opening pressing ring anti-
In the shaped cavity of spray apparatus ontology, in use, can realize that Expandable half seals rubber tube and is self-locking in preventer by suppressing
On ontology, the other side, which is then expanded, contacts sealing with the outer wall of coiled tubing, and the pressure of inside and outside gas or liquid is real
It now mutually balances, it is not easy to leak, use is more reliable, extends its service life.
Detailed description of the invention
Structural schematic diagram when attached drawing 1 is present invention installation；
Attached drawing 2 is view in transverse section of the invention；
Attached drawing 3 is the semi-cutaway that Expandable half seals rubber tube；
Attached drawing 4 be Expandable half seal rubber tube and coiled tubing sealing when state diagram；
In upper figure: the full seal apparatus F1 of four ram preventers, four ram preventer shear F2, four ram preventer slip systems
F3, four ram preventers, half seal apparatus F4, half seal sprawl and control block (1), blowout preventer body (2), rubber opening pressing ring (3), into
Hydraulic interface (4), Expandable partly seal rubber tube (5), connection sealing rubber ring (6), safety valve carrier (7), steel ball (8), determine out
Pressing spring (9), oil discharge passage (11), sealing joint cushion rubber (12), oil inlet passage (13), bolt (14), connects pressure regulation pressure cap (10)
Continuous oil pipe 15, set expansion side (5.1), lower unidirectional seal gap (5.2), lower anticreep extend out arm (5.3), under from lock end (5.4),
Upper one-way sealing notch (5.5), upper anticreep extend out arm (5.6), on from lock end (5.7).
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
Referring to attached Fig. 1 and 2, four ram preventer of a kind of coiled tubing, half seal apparatus that the present invention mentions, technical solution
It is: including half envelope sprawl and control block (1), blowout preventer body (2), rubber opening pressing ring (3), passes in and out hydraulic interface (4), expansible
Formula partly seals rubber tube (5), connection sealing rubber ring (6), safety valve carrier (7), steel ball (8), level pressure spring (9), pressure regulation pressure cap
(10), the center installation of oil discharge passage (11), sealing joint cushion rubber (12), oil inlet passage (13), the blowout preventer body (2) can
Expanding is partly sealed rubber tube (5), and the Expandable partly seals being open pressing ring from lock end by rubber for the tail portion of rubber tube (5)
(3) it is fixed on blowout preventer body (2), forms annular cavity, the outside of the blowout preventer body (2) is solid by bolt (14)
The inside of fixed half envelope sprawl and control block (1), half envelope sprawl and control block (1) is equipped with an oil inlet dashpot (1.1) and one
Fuel-displaced dashpot (1.2), and oil inlet dashpot (1.1) and the Expandable of blowout preventer body (2) partly seal rubber tube (5) it is corresponding,
And the annular cavity that rubber tube (5) formation is partly sealed with Expandable is connected to；The outer end of oil inlet dashpot (1.1) connects oil inlet
Channel (13), oil inlet passage (13) connect disengaging hydraulic interface (4) outside, and the outer end of fuel-displaced dashpot (1.2) connects oil discharge passage
(11), safety valve carrier (7) and in fuel-displaced dashpot (1.2) are equipped with, are equipped with steel ball (8) in safety valve carrier (7), steel ball (8)
Outside connect level pressure spring (9), the outside of level pressure spring (9) connects pressure regulation pressure cap (10).
Referring to attached drawing 3, it includes setting expansion side (5.1), lower unidirectional that the Expandable that the present invention mentions, which partly seals rubber tube (5),
Seal gap (5.2), lower anticreep extend out arm (5.3), under extended out from lock end (5.4), upper one-way sealing notch (5.5), upper anticreep
Arm (5.6), on from lock end (5.7), the two sides up and down for setting expansion side (5.1) are respectively equipped with one-way sealing notch
(5.5) and lower unidirectional seal gap (5.2), and upside is equipped with the upper anticreep upwardly extended and extends out arm (5.6), and downside is equipped with downward
The lower anticreep extended extends out arm (5.3), and the upper anticreep extends out in arm (5.6) connection from lock end (5.7), and lower anticreep extends out arm
(5.3) from lock end (5.4) under connecting.
Wherein, the section for setting the side that expansion side (5.1) is contacted with coiled tubing is arcuate structure, the section of the other side
For planar structure, and the arcuate structure is recessed to from lock end side, in use, applying pressure from planar structure side, so that it may
It is that the arcuate structure being recessed is heaved, is then contacted with the outer wall of coiled tubing and realize sealing, and upper one-way sealing notch at this time
(5.5) and lower unidirectional seal gap (5.2) is then because the reason of squeezing forms small half of notch or form a gap.
In addition, lower anticreep, which extends out arm (5.3), is equipped with thickening layer with the junction for setting expansion side (5.1)；Upper anticreep extends out
Arm (5.6) is equipped with thickening layer with the junction for setting expansion side (5.1), larger due to being pressurized, and is equipped with thickening layer, Ke Yigeng
The stability and fastness of good maintenance whole device.
Under furthermore from lock end (5.4) and on from lock end (5.7) be respectively equipped with convolution protrusion, the structure of convolution protrusion can
So as to can preferably realize self-locking function when its pressure-bearing, keep it more more crowded more secured.
The center of blowout preventer body (2) of the invention is equipped with the circular cavity that rubber tube (5) cooperation is partly sealed with Expandable,
And the upside of circular cavity is equipped with upper shaped cavity, downside is equipped with lower shaped cavity；And it is equipped with by blowout preventer body (2) two sides
Connecting hole be respectively communicated with oil inlet dashpot (1.1) and fuel-displaced dashpot (1.2), total and Expandable partly seal rubber
Cylinder (5) coincide.
The inlet side of upper shaped cavity is equipped with protrusion, and the other side is arcuate structure, raised inside and Expandable
Half envelope rubber tube (5) cooperates from lock end, and high spot is arranged rubber and is open pressing ring (3)；The arcuate structure of the other side with it is expansible
The upper anticreep that formula partly seals rubber tube (5) extends out arm (5.6) cooperation.
The application method for four ram preventer of coiled tubing, half seal apparatus that the present invention mentions, including following procedure:
1, it when being worked normally under coiled tubing (15) lower going-into-well, needs to open half and seals, suppressed by oil inlet passage (13),
Hydraulic oil enters the annular cavity that Expandable partly seals rubber tube (5) along oil inlet dashpot (1.1), then passes through safety valve
It is flowed out after pressure limiting from oil discharge passage, so that annular cavity is kept stable pressure, so that Expandable is partly sealed rubber tube (5) can be swollen
It opens；
2, during distending, the anticreep that Expandable can partly be sealed rubber tube (5) by hydraulic oil extends out arm (5.3) and from lock end
(5.4) it is fixed in the self-locking grooves in blowout preventer body (2), with hydraulic pressure rise, is extended out from lock end (5.4) with anticreep
The self-lock force of arm (5.3) also increases, and due to being provided with upper one-way sealing notch (5.5) and lower unidirectional seal gap (5.2), sets
Expand side (5.1) to expand to direction under the effect of the pressure, form leather cup seal structure, thus tightly and coiled tubing
(15) outer wall forms sealing, and oil gas is normally produced；
3, when needing above to mention coiled tubing, then close half and seal, stop suppressing from oil inlet passage (13) first, and by with oil inlet
The reversal valve pressure release of channel (13) connection, expansion side (5.1) that sets that Expandable partly seals rubber tube (5) bounces back, thus with even
The outer wall separation of continuous oil pipe, depressurization.
Embodiment 2, difference from Example 1 are: one for setting expansion side (5.1) and contacting with coiled tubing of the invention
The section of side is arcuate structure, and the section of the other side is the protrusion arc structure for being conducive to rebound.
Application method is same as Example 1, is a difference in that: with hydraulic pressure rise, setting expansion side (5.1) and exists
It is expanded under the action of pressure to a direction, forms leather cup seal structure, so that the outer wall formation with coiled tubing tightly seals；
And the section of the side contacted with coiled tubing is arcuate structure, then is the bottom of bowl shape that opposite direction forms protrusion.
Embodiment 3, is a difference in that with Examples 1 and 2: expansion side (5.1) that sets of the invention is three stage structure, with
The section of the side of coiled tubing contact is arcuate structure, planar structure and three sections of arcuate structure compositions, and intermediate one section is plane
Structure.
In this way, intermediate planar structure, preferably with the outer wall of coiled tubing ining conjunction with, the sealing surface of formation is bigger, and sealing is imitated
Fruit is also more longlasting.
The above, is only part preferred embodiment of the invention, and anyone skilled in the art may benefit
Equivalent technical solution is modified or is revised as with the technical solution of above-mentioned elaboration.Therefore, technology according to the present invention
Any simple modification or substitute equivalents that scheme is carried out, belong to the greatest extent the scope of protection of present invention.
Claims (9)
1. a kind of four ram preventer of coiled tubing, half seal apparatus, it is characterized in that: including half envelope sprawl and control block (1), preventer
Ontology (2), rubber opening pressing ring (3), disengaging hydraulic interface (4), Expandable partly seal rubber tube (5), connection sealing rubber ring
(6), safety valve carrier (7), steel ball (8), level pressure spring (9), pressure regulation pressure cap (10), oil discharge passage (11), sealing joint cushion rubber
(12), the center installation Expandable of oil inlet passage (13), the blowout preventer body (2) partly seals rubber tube (5), described expansible
Formula partly seals being fixed on blowout preventer body (2) from lock end by rubber opening pressing ring (3) for the tail portion of rubber tube (5), forms circle
Toroidal cavity, by bolt (14) fixed half envelope sprawl and control block (1), half envelope expands in the outside of the blowout preventer body (2)
The inside for opening control block (1) is equipped with an oil inlet dashpot (1.1) and a fuel-displaced dashpot (1.2), and oil inlet dashpot
(1.1) partly to seal rubber tube (5) with the Expandable of blowout preventer body (2) corresponding, and rubber tube (5) shape is partly sealed with Expandable
At annular cavity connection；The outer end of oil inlet dashpot (1.1) connects oil inlet passage (13), oil inlet passage (13) connect outside into
The outer end of hydraulic interface (4) out, fuel-displaced dashpot (1.2) connects oil discharge passage (11), and peace is equipped in fuel-displaced dashpot (1.2)
Full valve carrier (7), safety valve carrier (7) is interior to be equipped with steel ball (8), and the outside of steel ball (8) connects level pressure spring (9), level pressure spring
(9) outside connects pressure regulation pressure cap (10).
2. four ram preventer of coiled tubing, half seal apparatus according to claim 1, it is characterized in that: the Expandable
Half envelope rubber tube (5) include set expansion side (5.1), lower unidirectional seal gap (5.2), lower anticreep extend out arm (5.3), under it is self-locking
End (5.4), upper one-way sealing notch (5.5), upper anticreep extend out arm (5.6), are upper from lock end (5.7), and described set expands side
(5.1) two sides up and down are respectively equipped with one-way sealing notch (5.5) and lower unidirectional seal gap (5.2), and upside be equipped with to
The upper anticreep of upper extension extends out arm (5.6), and downside is equipped with the lower anticreep extended downwardly and extends out arm (5.3), and the upper anticreep extends out
From lock end (5.7) in arm (5.6) connection, lower anticreep is extended out under arm (5.3) connection from lock end (5.4).
3. four ram preventer of coiled tubing, half seal apparatus according to claim 2, it is characterized in that: described sets expansion
The section for the side that side (5.1) is contacted with coiled tubing is arcuate structure, and the section of the other side is planar structure.
4. four ram preventer of coiled tubing, half seal apparatus according to claim 2, it is characterized in that: described sets expansion
The section for the side that side (5.1) is contacted with coiled tubing is arcuate structure, and the section of the other side is the raised arc for being conducive to rebound
Shape structure.
5. four ram preventer of coiled tubing, half seal apparatus according to claim 2, it is characterized in that: described sets expansion
Side (5.1) is three stage structure, and the section of the side contacted with coiled tubing is arcuate structure, planar structure and arcuate structure three
Duan Zucheng, intermediate one section is planar structure.
6. four ram preventer of coiled tubing, half seal apparatus according to claim 2, it is characterized in that: outside the lower anticreep
Expand arm (5.3) and is equipped with thickening layer with the junction for setting expansion side (5.1)；Upper anticreep extends out arm (5.6) and sets expansion side
(5.1) junction is equipped with thickening layer.
7. four ram preventer of coiled tubing, half seal apparatus according to claim 2, it is characterized in that: described is lower from lock end
(5.4) and on from lock end (5.7) be respectively equipped with convolution protrusion.
8. four ram preventer of coiled tubing, half seal apparatus according to claim 1, it is characterized in that: the preventer sheet
The center of body (2) is equipped with the circular cavity that rubber tube (5) cooperation is partly sealed with Expandable, and the upside of circular cavity is equipped with upper different
Shape cavity, downside are equipped with lower shaped cavity；And the connecting hole and oil inlet dashpot being equipped with by blowout preventer body (2) two sides
(1.1) it is respectively communicated with fuel-displaced dashpot (1.2).
9. four ram preventer of coiled tubing, half seal apparatus according to claim 8, it is characterized in that: the upper abnormity is empty
The inlet side of chamber is equipped with protrusion, and the other side is arcuate structure, and raised inside partly seals oneself of rubber tube (5) with Expandable
Lock end cooperation, high spot are arranged rubber and are open pressing ring (3)；The arcuate structure and Expandable of the other side partly seal rubber tube (5)
Upper anticreep extends out arm (5.6) cooperation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810996159.1A CN109184611B (en) | 2018-08-29 | 2018-08-29 | Coiled tubing four-ram blowout preventer semi-sealing device |
| CN202010965707.1A CN112031696A (en) | 2018-08-29 | 2018-08-29 | Coiled tubing four-ram blowout preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810996159.1A CN109184611B (en) | 2018-08-29 | 2018-08-29 | Coiled tubing four-ram blowout preventer semi-sealing device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010965707.1A Division CN112031696A (en) | 2018-08-29 | 2018-08-29 | Coiled tubing four-ram blowout preventer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109184611A true CN109184611A (en) | 2019-01-11 |
| CN109184611B CN109184611B (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810996159.1A Active CN109184611B (en) | 2018-08-29 | 2018-08-29 | Coiled tubing four-ram blowout preventer semi-sealing device |
| CN202010965707.1A Withdrawn CN112031696A (en) | 2018-08-29 | 2018-08-29 | Coiled tubing four-ram blowout preventer |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202010965707.1A Withdrawn CN112031696A (en) | 2018-08-29 | 2018-08-29 | Coiled tubing four-ram blowout preventer |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112031696A (en) | 2020-12-04 |
| CN109184611B (en) | 2020-11-06 |
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