CN108756803A - A kind of hydraulic double-ram blowout preventer - Google Patents
A kind of hydraulic double-ram blowout preventer Download PDFInfo
- Publication number
- CN108756803A CN108756803A CN201810893136.8A CN201810893136A CN108756803A CN 108756803 A CN108756803 A CN 108756803A CN 201810893136 A CN201810893136 A CN 201810893136A CN 108756803 A CN108756803 A CN 108756803A
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- China
- Prior art keywords
- piston
- flashboard
- blowout preventer
- nothing piece
- cylinder
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- 230000002265 prevention Effects 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims description 8
- 241000233855 Orchidaceae Species 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 30
- 238000005553 drilling Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 239000013049 sediment Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000004886 head movement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Actuator (AREA)
Abstract
The invention discloses a kind of hydraulic double-ram blowout preventers, including：Integral hydraulic cylinder, half envelope flashboard, blind rams, pole shutoff, all-or-nothing piece, oil inlet flange and blind flange；Half envelope flashboard and blind rams are disposed as flat, and are arranged inside blowout preventer body；Half envelope flashboard and hermetically sealed flashboard are connect with Integral hydraulic cylinder；Pole shutoff and all-or-nothing piece are fixed on blowout preventer body, and are connected to respectively with oil inlet flange；And pole shutoff and all-or-nothing piece coordinate with blowout preventer bonnet respectively, blowout preventer bonnet is closed with blowout preventer body lid and is connected；Blind flange and oil inlet flanged joint.Preventer disclosed by the invention seals the combination of gate using Integral hydraulic cylinder, full envelope gate and half, overcomes the defect of existing preventer blowout prevention poor performance, improves blowout prevention and the sealing performance of preventer, is convenient for assembly and disassembly.
Description
Technical field
The present invention relates to petroleum collection field of mechanical technique, more particularly to a kind of hydraulic double-ram blowout preventer.
Background technology
Preventer is the device for closing well head in the operation process such as formation testing, well workover, completion.In oil drilling and well workover
In operation process, to prevent the generation of blowout and well kick accident, it is necessary to well head is closed using preventer, to ensure operating personnel
It is the security seal wellhead assembly that oil field commonly prevents blowout with the safety of equipment.When oil drilling, preventer is mounted on well
On muzzle tube head, for controlling the blowout apparatus of high pressure oil, gas and water.When well oil atmospheric pressure is very high, preventer can be well head
Closing.When being pressed into weighted mud out of drilling rod, there is four-way under flashboard, alternatively go out the mud by gas cut, increases fluid column in well
Pressure, to push down the ejection of high-pressure oil gas.
In the prior art, preventer upper layer and lower layer is all symmetrical two pieces for the flashboard of sealing wellhead, opposite from well head
Movement blocks blowout prevention, this has resulted in contact gap of the two shoe brake plates among well head and has been easy under the action of high-pressure oil gas point
It opens, to lose blowout prevention function；And hydrodynamic preventer used by oil field at present, include mainly shell, side door, flashboard and
Hydraulic cylinder offers main channel in the middle part of shell, and the two side of shell symmetrically offers flashboard chamber, and two shoe brake plates are placed in
Flashboard intracavitary, shell both sides flashboard chamber are sequentially arranged with side door, hydraulic cylinder and cylinder cap outside；Piston and piston are equipped in hydraulic cylinder
One end of bar, piston rod is connected across side door with flashboard, and the other end is connected with piston；Lock shaft is connected across cylinder cap with piston；
Since used hydraulic cylinder is cylindrical shape, side door is as its cylinder bottom, and piston rod is also separate structure with piston, because
This, not only processing is complicated, precision is low, of high cost, but also inconvenient dismounting and repair, security reliability are low.
Therefore, how the problem of a kind of preventer of blowout prevention superior performance is those skilled in the art's urgent need to resolve is provided.
Invention content
In view of this, surge double-gate preventer the present invention provides one kind, using Integral hydraulic cylinder, full envelope gate and
Half seals the combination of gate, overcomes the defect of existing preventer blowout prevention poor performance, improves blowout prevention and the sealing performance of preventer,
Convenient for assembly and disassembly.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of hydraulic double-ram blowout preventer, including：Integral hydraulic cylinder, half envelope flashboard, blind rams, pole shutoff, unlatching
Bar, oil inlet flange and blind flange；The half envelope flashboard and the blind rams are disposed as flat, and are arranged in blowout preventer body
It is internal；The half envelope flashboard is connect with the Integral hydraulic cylinder；The pole shutoff and the all-or-nothing piece are fixed on the blowout prevention
On device ontology, and it is connected to the oil inlet flange；And the pole shutoff and the all-or-nothing piece coordinate with blowout preventer bonnet respectively, it is described
Blowout preventer bonnet is closed with the blowout preventer body lid and is connected；The blind flange is separately positioned on the preventer with the oil inlet flange
Outer body, the blind flange and the oil inlet flanged joint.
Optionally, the Integral hydraulic cylinder includes：Hydraulic cylinder, cylinder cap, piston with rod and lock shaft；The hydraulic cylinder
Body is the cylindrical shape bottom of with, and the cylinder cap lid closes in the opening of the hydraulic cylinder；The piston with rod is placed in the hydraulic pressure
In cylinder body, and the piston rod end of the piston with rod passes through the hydraulic cylinder bottom centre；The lock shaft passes through described
The center of cylinder cap is connect with the piston with rod；The half envelope flashboard is connect with the piston with rod.
Optionally, the blowout preventer bonnet is made of the corresponding seat of honour and lower seat, and the seat of honour is fixedly connected with the lower seat；
It is equipped with symmetrical cylindrical pole shutoff cylinder sleeve and all-or-nothing piece cylinder sleeve at the seat of honour and the front and rear sides of the lower seat, it is described to open
Bar cylinder sleeve is opened with all-or-nothing piece piston to coordinate；The pole shutoff cylinder sleeve coordinates with pole shutoff piston.
Optionally, the seat of honour and the center of the lower seat are equipped with flashboard and open and close cylinder sleeve, and the flashboard opens and closes cylinder sleeve and passes through
The piston with rod opens and closes piston with flashboard and is connected.
Optionally, the pole shutoff is equipped with the first centre bore, and first centre bore passes through oil duct and the all-or-nothing piece
Piston, the pole shutoff piston and the flashboard open and close the upper surface connection of piston.
Optionally, the all-or-nothing piece is equipped with the second centre bore, and second centre bore passes through oil duct and the all-or-nothing piece
Piston, the pole shutoff piston and the flashboard open and close the lower face connection of piston.
It can be seen via above technical scheme that compared with prior art, surge double disc the present disclosure provides one kind
Preventer, since the flashboard of the present invention is divided into semitight flashboard and hermetically sealed flashboard, semitight flashboard is two, and opposite place is set
For arc, embrace sealing with drilling rod or beam hanger；The opposite place of two hermetically sealed flashboards is set as phase button-type, reaches the mesh of shut-in well mouth
's.When semitight flashboard has tubing string in well blowout prevention use, hermetically sealed flashboard in well without tubing string when blowout prevention use.So hermetically sealed lock
Plate and semitight flashboard are used cooperatively, and can effectively improve the blowout prevention performance of preventer；Cylinder design is structure as a whole, thus its
Structure is more reasonable, easy to process, and precision is high, at low cost, easy to disassemble and repair, and security reliability is strong, to improve
The blowout prevention performance of preventer；Half envelope gate and blind rams are set as flat, belong to autonomous innovation structure, not only simplify flashboard
Structure, and greatly reduce the whole height of duct blowout preventer for testing oil.And it is used in internal shutter chamber position in the present invention
Sediment ejection trough design, greatly reduce silt, mud block wellbore possibility, flashboard work failure rate is reduced to controllable model
It encloses, meanwhile, there is sediment ejection trough pressure to cheer effect, seal relatively reliable；Pole shutoff and all-or-nothing piece respectively with oil inlet flange and anti-
Spray apparatus lid matches, and when oil spray occurs, pulls handle on hydraulic control unit to the position closed, and hydraulic oil is from oil inlet flange warp
Pole shutoff and blowout preventer bonnet, it is close to reach to push hermetically sealed flashboard and semitight flashboard to be drawn close to the center of preventer
The purpose of envelope.
Secondly, the piston rod end of piston with rod passes through hydraulic cylinder bottom centre, is connect with flashboard convenient for piston rod, into
And flashboard is promoted or pulls, realize the Kaifeng of well head.
In conclusion hydraulic double-ram blowout preventer disclosed by the invention is sealed using Integral hydraulic cylinder, full envelope gate and half
The combination of gate overcomes the defect of existing preventer blowout prevention poor performance, improves blowout prevention and the sealing performance of preventer, is convenient for
Assembly and disassembly.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 attached drawings are the structural schematic diagram of the present invention；
Fig. 2 attached drawings are the sectional view of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a kind of hydraulic double-ram blowout preventers, including：Integral hydraulic cylinder 1, partly envelope flashboard 2,
Blind rams 3, pole shutoff 4, all-or-nothing piece 5, oil inlet flange 6 and blind flange 7；Half envelope flashboard 2 and blind rams 3 are disposed as flat
Shape, and be arranged inside blowout preventer body 8；Half envelope flashboard 2 is connect with Integral hydraulic cylinder 1；Pole shutoff 4 and all-or-nothing piece 5 are fixed
It is connected on blowout preventer body 8, and with oil inlet flange 6；And pole shutoff 4 and all-or-nothing piece 5 coordinate with blowout preventer bonnet 9 respectively, blowout prevention
Device lid 9 closes connection with the lid of blowout preventer body 8；Blind flange 7 is separately positioned on 8 outside of blowout preventer body with oil inlet flange 6；Blind flange
7 connect with oil inlet flange 6.
Cylinder design is structure as a whole, thus its structure is more reasonable, easy to process, and precision it is high, it is at low cost, be convenient for
Dismounting and repair, security reliability is strong, to improve the blowout prevention performance of preventer；Half envelope gate and blind rams are set as flat
Shape, belongs to autonomous innovation structure, not only simplifies the structure of flashboard, and greatly reduces the whole height of duct blowout preventer for testing oil.
And in the present invention internal shutter chamber position use sediment ejection trough design, greatly reduce silt, mud block wellbore can
Can property, flashboard work failure rate is reduced to controlled range, meanwhile, there is sediment ejection trough pressure to cheer effect, seal relatively reliable；
Pole shutoff and all-or-nothing piece are matched with oil inlet flange and blowout preventer bonnet respectively, when oil spray occurs, are pulled on hydraulic control unit
Handle to close position, hydraulic oil from oil inlet flange through pole shutoff and blowout preventer bonnet, to push hermetically sealed flashboard and semitight
Flashboard is drawn close to the center of preventer, to achieve the purpose that sealing.
Optionally, Integral hydraulic cylinder 1 includes：Hydraulic cylinder 11, cylinder cap 12, piston with rod 13 and lock shaft 14；Hydraulic pressure
Cylinder body 11 is the cylindrical shape bottom of with, and the lid of cylinder cap 12 closes in the opening of hydraulic cylinder 11；Piston with rod 13 is placed in hydraulic cylinder 11
It is interior, and the piston rod end of piston with rod 13 passes through 11 bottom centre of hydraulic cylinder；Lock shaft 14 pass through cylinder cap 12 center with
Piston with rod 13 connects；Half envelope flashboard 2 is connect with piston with rod 13.
Cylinder cap is equipped with the pipeline to interlink with the hydraulic system of peripheral hardware；Piston with rod is placed in hydraulic cylinder, and rod failure is lived
The piston rod end of plug is equipped with wedge head and passes through hydraulic cylinder bottom centre；The inner end of lock shaft passes through center and the rod failure of cylinder cap
Piston is connected by screw thread, and the outer end of lock shaft is equipped with handle, and between piston with rod and cylinder cap on lock shaft
Place is equipped with positive stop lug boss；The bottom periphery of hydraulic cylinder is equipped with the flange outwardly protruded；The piston rod end of piston with rod passes through
Hydraulic cylinder bottom centre connect convenient for piston rod with flashboard, and then promotes or pull flashboard, realizes the Kaifeng of well head.
Optionally, blowout preventer bonnet 9 is made of the corresponding seat of honour and lower seat, and the seat of honour is fixedly connected with lower seat；At the seat of honour under
Match with all-or-nothing piece piston equipped with symmetrical cylindrical pole shutoff cylinder sleeve and all-or-nothing piece cylinder sleeve, all-or-nothing piece cylinder sleeve the front and rear sides of seat
It closes；Pole shutoff cylinder sleeve coordinates with pole shutoff piston.
Optionally, the seat of honour and the center of lower seat are equipped with flashboard and open and close cylinder sleeve, and flashboard opens and closes cylinder sleeve and passes through piston with rod and lock
Plate opens and closes piston and is connected.
Optionally, pole shutoff 4 is equipped with the first centre bore, and the first centre bore passes through oil duct and all-or-nothing piece piston, pole shutoff
Piston and flashboard open and close the upper surface connection of piston.
Optionally, all-or-nothing piece 5 is equipped with the second centre bore, and the second centre bore passes through oil duct and all-or-nothing piece piston, pole shutoff
Piston and flashboard open and close the lower face connection of piston.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is said referring to method part
It is bright.
The present invention operation principle be：When work, two sets of present invention are sub-packed in the both sides of the shell of preventer, i.e., first
The wedge head of piston rod is connected with the flashboard of preventer, then the flange of hydraulic cylinder is passed through into the shell of connection bolt and preventer
Body is connected, and pipeline is connected with hydraulic system.
Since the flashboard of the present invention is divided into semitight flashboard and hermetically sealed flashboard, semitight flashboard is two, and opposite place
It is set as arc, is embraced sealing with drilling rod or beam hanger, the opposite place of two hermetically sealed flashboards is set as phase button-type, reaches the mesh of shut-in well mouth
's.When semitight flashboard has tubing string in well blowout prevention use, hermetically sealed flashboard in well without tubing string when blowout prevention use.So hermetically sealed lock
Plate and semitight flashboard are used cooperatively, and can effectively improve the blowout prevention performance of preventer.
When the contingencies such as blowout or well kick occur, hydraulic system is opened, so that high-pressure medium is passed through pipeline and pushes both sides
Piston with rod and flashboard simultaneously to the main channel center movement of shell, the semicircle oil pipe slot obvolvent Cheng Yuan on flashboard is held tightly
Oil pipe makes well head close.And when power is off, then artificial control crank, rotates check lock lever, realizes the closing of well head.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (6)
1. a kind of hydraulic double-ram blowout preventer, which is characterized in that including：Integral hydraulic cylinder (1), seals lock at half envelope flashboard (2) entirely
Plate (3), pole shutoff (4), all-or-nothing piece (5), oil inlet flange (6) and blind flange (7)；The half envelope flashboard (2) and the full envelope lock
Plate (3) is disposed as flat, and is arranged internal in blowout preventer body (8)；The half envelope flashboard (2) and the hermetically sealed flashboard
(3) it is connect with the Integral hydraulic cylinder (1)；The pole shutoff (4) and the all-or-nothing piece (5) are fixed on the preventer sheet
On body (8), and it is connected to respectively with the oil inlet flange (6)；And the pole shutoff (4) and the all-or-nothing piece (5) respectively with blowout prevention
Device lid (9) coordinates, and the blowout preventer bonnet (9) closes connection with the blowout preventer body (8) lid；The blind flange (7) with it is described into
Oil process orchid (6) is separately positioned on the outside of the blowout preventer body (8), and the blind flange (7) connects with the oil inlet flange (6)
It connects.
2. a kind of hydraulic double-ram blowout preventer according to claim 1, which is characterized in that the Integral hydraulic cylinder (1)
Including：Hydraulic cylinder (11), cylinder cap (12), piston with rod (13) and lock shaft (14)；The hydraulic cylinder (11) is the bottom of with
Cylindrical shape, cylinder cap (12) lid close in the opening of the hydraulic cylinder (11)；The piston with rod (13) is placed in the liquid
In cylinder pressure body (11), and the piston rod end of the piston with rod (13) passes through the hydraulic cylinder (11) bottom centre；It is described
Lock shaft (14) passes through the center of the cylinder cap (12) and is connect with one end of the piston with rod (13)；The half envelope flashboard
(2) it is connect with the other end of the piston with rod (13) with the blind rams (3).
3. a kind of hydraulic double-ram blowout preventer according to claim 1, which is characterized in that the blowout preventer bonnet (9) is by right
The seat of honour answered and lower seat composition, the seat of honour is fixedly connected with the lower seat；Front and rear sides at the seat of honour and the lower seat
Equipped with symmetrical cylindrical pole shutoff cylinder sleeve and all-or-nothing piece cylinder sleeve, the all-or-nothing piece cylinder sleeve coordinates with all-or-nothing piece piston；It is described
Pole shutoff cylinder sleeve coordinates with pole shutoff piston.
4. a kind of hydraulic double-ram blowout preventer according to claim 3, which is characterized in that the seat of honour and the lower seat
Center is equipped with flashboard and opens and closes cylinder sleeve, and the flashboard opens and closes cylinder sleeve and connected by the piston with rod (13) and flashboard keying piston cooperation
It connects.
5. a kind of hydraulic double-ram blowout preventer according to claim 4, which is characterized in that the pole shutoff (4) is equipped with
First centre bore, first centre bore are opened by oil duct and the all-or-nothing piece piston, the pole shutoff piston and the flashboard
Close the upper surface connection of piston.
6. a kind of hydraulic double-ram blowout preventer according to claim 5, which is characterized in that the all-or-nothing piece (5) is equipped with
Second centre bore, second centre bore are opened by oil duct and the all-or-nothing piece piston, the pole shutoff piston and the flashboard
Close the lower face connection of piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810893136.8A CN108756803A (en) | 2018-08-07 | 2018-08-07 | A kind of hydraulic double-ram blowout preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810893136.8A CN108756803A (en) | 2018-08-07 | 2018-08-07 | A kind of hydraulic double-ram blowout preventer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108756803A true CN108756803A (en) | 2018-11-06 |
Family
ID=63969117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810893136.8A Pending CN108756803A (en) | 2018-08-07 | 2018-08-07 | A kind of hydraulic double-ram blowout preventer |
Country Status (1)
| Country | Link |
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| CN (1) | CN108756803A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080197306A1 (en) * | 2007-02-16 | 2008-08-21 | Robert Arnold Judge | Ram bop position sensor |
| CN201386532Y (en) * | 2009-04-09 | 2010-01-20 | 胜利油田供应方圆石油装备有限责任公司 | Blowout preventer cover hydraulic drawing-type double-gate segment blowout preventer |
| CN201747318U (en) * | 2010-07-01 | 2011-02-16 | 江苏省金峰石油机械制造有限公司 | Side door hydraulic cylinder of hydraulic flashboard blowout preventer |
| CN202117611U (en) * | 2011-06-27 | 2012-01-18 | 中国石油天然气股份有限公司 | Flashboard blowout preventer with self-sealing function |
| CN202417402U (en) * | 2011-12-11 | 2012-09-05 | 杨桂青 | Dual-pipe operation blowout preventer of horizontal well |
| CN208777945U (en) * | 2018-08-07 | 2019-04-23 | 阜宁县石油机械有限公司 | A kind of hydraulic double-ram blowout preventer |
-
2018
- 2018-08-07 CN CN201810893136.8A patent/CN108756803A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080197306A1 (en) * | 2007-02-16 | 2008-08-21 | Robert Arnold Judge | Ram bop position sensor |
| CN201386532Y (en) * | 2009-04-09 | 2010-01-20 | 胜利油田供应方圆石油装备有限责任公司 | Blowout preventer cover hydraulic drawing-type double-gate segment blowout preventer |
| CN201747318U (en) * | 2010-07-01 | 2011-02-16 | 江苏省金峰石油机械制造有限公司 | Side door hydraulic cylinder of hydraulic flashboard blowout preventer |
| CN202117611U (en) * | 2011-06-27 | 2012-01-18 | 中国石油天然气股份有限公司 | Flashboard blowout preventer with self-sealing function |
| CN202417402U (en) * | 2011-12-11 | 2012-09-05 | 杨桂青 | Dual-pipe operation blowout preventer of horizontal well |
| CN208777945U (en) * | 2018-08-07 | 2019-04-23 | 阜宁县石油机械有限公司 | A kind of hydraulic double-ram blowout preventer |
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