CN109113635A - A kind of unidirectional shearing preventer - Google Patents
A kind of unidirectional shearing preventer Download PDFInfo
- Publication number
- CN109113635A CN109113635A CN201811238422.7A CN201811238422A CN109113635A CN 109113635 A CN109113635 A CN 109113635A CN 201811238422 A CN201811238422 A CN 201811238422A CN 109113635 A CN109113635 A CN 109113635A
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- CN
- China
- Prior art keywords
- piston
- preventer
- hydraulic cylinder
- shell
- flashboard
- 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
-
- 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
- E21B33/062—Ram-type blow-out preventers, e.g. with pivoting rams with sliding rams
- E21B33/063—Ram-type blow-out preventers, e.g. with pivoting rams with sliding rams for shearing drill pipes
Abstract
The present invention provides a kind of unidirectional shearing preventer, including preventer shell, has the channel being connected to well head in shell, for connecting well head or standpipe.The shell two sides have hole, the action channel of shear ram is provided, respectively there are one or more hydraulic cylinders in the shell two sides, it is fixedly connected with shell, power is provided by hydraulic drive piston for shear ram, the settable series cylinder in shell two sides, increase shearing force, the power of series cylinder can use hydraulic or seawater, this preventer is different from traditional preventer bilateral flashboard and inwardly squeezes the mode cut simultaneously, using single disc single shear, shell bears shearing counter-force, two side piston of preventer pushes away on one side, same direction movement is pulled on one side, the present invention uses completely new preventer structure, and design specialized flashboard, so that under similarity condition, not only has the repertoire of traditional shear ram preventer, and shear ability is multiplied.
Description
Technical field
The present invention relates to a kind of preventers of ocean engineering field, especially with regard to a kind of unidirectional shearing preventer.
Background technique
Ram preventer (BOP) is the most important well-control equipment of drilling and well completion process, ram preventer in oil exploitation
Main feature: first is that ram seal ability is strong and reliability is high, it is high pressure resistant, closing well can be kept closed for a long time
Mouthful；Second is that the flashboard for closing various specifications type drilling rod, casing, oil pipe can be equipped in preventer, it can also be equipped with and close empty well
Blind rams, and it is equipped with the shear ram for cutting drilling rod in an emergency situation.
Shear ram preventer is a seed type of ram preventer, it is mainly used in drilling process and the works such as well workover
Emergency during industry, it is necessary to the shear ram for closing preventer cuts well mouth drill column, and seals entire well head, with
The exploitation of petroleum gas gradually move towards deep-sea, service ever-increasing demand, new type of deep-water drilling well to meet deepwater drilling
Platform has come into operation, and deep-water blowout preventer may need to work under water in the case where individual well drilling well up to 45 days to 90 days,
In the case where needing multiple wells drilling and well completion, bottom time can be can exceed that 1 year, urgent when blowout etc. may occur
Situation is protection operating personnel's life security, unique barrier of equipment and environment, therefore, it is necessary when well is closed in preventer starting
Guarantee failure-free operation.
Existing ram preventer shearing force is insufficient, can only cut common drilling rod under the limited conditions, and for special drilling tool,
Such as tool joint, drill collar, heavy weight drill pipe even cannot be guaranteed to cut using more and more high-strength drill pipes etc. later, in addition right
In having occurred and that the drilling tool of deformation or offset not can guarantee shearing yet, industry compels high-performance shear ram preventer demand
It cuts.
Summary of the invention
In view of the above problems, the present invention is intended to provide a kind of unidirectional shearing preventer.
To realize the above-mentioned technical purpose, the present invention uses following technical scheme, a kind of unidirectional shearing preventer, the blowout prevention
Device includes a preventer shell, and the channel being connected to well head is equipped in the preventer shell, which connects well head or standpipe,
The two sides of the shell have hole, provide the action channel of shear ram, are equipped with moveable shear ram in shell, cut
It cuts flashboard to fabricate using monobloc forging part, intermediate clear size of opening is greater than well head size and passes through for drilling tool, and flashboard both sides can connect
It is acted on simultaneously by the piston of two sides, to the mobile shearing drilling tool in side, is equipped with shearing knife edge, the two sides of shell close to side is pushed away in flashboard
It is separately connected and pushes away side side door and draw side side door, the two sides of preventer shell are respectively provided with hydraulic cylinder, and side is to push away side hydraulic cylinder, another
Side is to draw side hydraulic cylinder, and the hydraulic cylinder of two hydraulic cylinders is each provided at the outside of hydraulic cylinder, pushes away side hydraulic cylinder and push away side hydraulic cylinder
Lid is connect by multiple hydraulic cylinders fastener with side side door is pushed away, and is pushed away side hydraulic cylinder and is pushed away side hydraulic cylinder and push away and divides between the side door of side
It She You not seal, draw side hydraulic cylinder and side hydraulic cylinder is drawn to connect respectively with side side door is drawn by multiple hydraulic cylinders fastener, draw
It is respectively equipped with sealing between side hydraulic cylinder and drawing side hydraulic cylinder and drawing side side door, the outside of side hydraulic cylinder is drawn to be equipped with auxiliary
Cylinder, draw be linked to be between side hydraulic cylinder and auxiliary cylinders series cylinder, auxiliary cylinders and its auxiliary cylinders cylinder cap and drawing side hydraulic cylinder it
Between be respectively equipped with sealing；It pushes away to be equipped with inside side hydraulic cylinder and pushes away side piston, pushing away side piston horizontal can move inside the hydraulic cylinder of side pushing away
It is dynamic, it is described push away side piston and be threadingly connected with push away side piston bar, push away side piston bar and be inserted by pushing away the centre bore of side side door
The inside of preventer shell draws the inside of side hydraulic cylinder to be equipped with and draws side piston, side piston is drawn to be mounted on by piston rod connection
Auxiliary the cylinder piston inside auxiliary cylinders and side piston and auxiliary the cylinder piston is drawn to be able to maintain synchronizing moving, side piston is drawn to pass through drawing
Side piston bar is fixedly connected to pull and push flashboard with flashboard, and the rear portion of the preventer is equipped with locking device, locking dress
It sets including slender member and locking member, slender member is located in the aperture for pushing away side piston and can move relative to side piston is pushed away
Dynamic, locking member can be moved inward relative to the side piston that pushes away will push away side piston and be locked in closed position.
Preferably, being bolted to connection between the shearing knife edge and flashboard.
Preferably, described push away side piston, draw side piston and assist being respectively equipped with piston ring in the cylinder piston.
Preferably, the piston that auxiliary cylinders are smaller than drawing side hydraulic cylinder piston using size.
Preferably, the hydraulic cylinder of preventer is respectively provided with hydraulic and seawater dual interface.
The principle that innovative two side pistons of use of the preventer that the present invention designs are acted to same direction, shell is by metal
Forging or casting are made, and suitable for being no more than the well head pressure of 25000Psi, temperature not higher than 177 DEG C has among shell
One channel, size determine that this channel passes through for drilling fluid according to the requirement of drilling well, for drilling tool provide by
Space, there are two the through-holes for flashboard movement at left and right sides of shell, and when flashboard is opened, hole and channel alignment on flashboard can be with
Normal drillng operation is carried out, when needing to shear and close preventer, flashboard moves to the right, shears drilling tool and close blowout prevention
Device；Compared to traditional preventer using the hydraulic inside principle for promoting flashboard to realize shearing in two sides, the preventer uses monolith
Flashboard, two side pistons are connected by piston rod with flashboard, and when needing shearing work, a side piston forms thrust to flashboard, separately
One side piston forms pulling force to flashboard, flashboard is pulled to drilling tool, and will bore by corresponding to inter-agency section on flashboard and shell
Tool is cut；Preventer of the invention with traditional preventer using same size piston and hydraulic pressure and flow,
2 times of the reachable traditional preventer of shearing force, according to the mode of series cylinder, 2.5 times of the reachable traditional preventer of shearing force
More than, any drilling tool in addition to drill bit can be cut, the side of the flashboard can be realized shearing, and flashboard can be with two sides
Piston is connected, and two side pistons provide power jointly for flashboard shearing, and flashboard can be torn open from wherein side hydraulic cylinder connecting interface
It unloads, safeguard or replaces, top sealing can be arranged according to the requirement of drillng operation in the flashboard, realize that same flashboard can be cut
The function of cutting and can shunt in a well after shearing, the shell side are provided with dismountable auxiliary shearing device, can be effective auxiliary
It helps shearing and can be replaced after being damaged；Scheme of the present invention due to using the equidirectional effect of double hydraulic cylinder, for
The pressure of side well head is drawn to become power, and the resistance approximate equilibrium that can be formed with the well head pressure for pushing away side, almost without tradition
The well head pressure of preventer forms the problem of resistance, and reduced resistance is equivalent to increased shearing force, while the present invention passes through
The scheme of series connection small-diameter hydraulic cylinder introduces seawater pressure as power, not only ensure that preventer works normally, but also can be by big
The ram block of closing is pushed back open state by the hydraulic of hydraulic cylinder, can satisfy by land and marine mining petroleum, natural
Safety shut-in well when gas and various mining drilling wells requires, and the working method of traditional preventer is changed from principle, but make
The requirement made is consistent with traditional preventer, does not increase manufacture difficulty, and existing industry level may be implemented to manufacture and test, in addition
The present invention is designed due to using single disc, only locking device need to be arranged in side.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
In figure: 1, preventer shell；2, side side door is pushed away；3, side hydraulic cylinder is pushed away；4, side hydraulic cylinder is pushed away；5, draw side hydraulic
Cylinder；6, side hydraulic cylinder is drawn；7, auxiliary cylinders；8, auxiliary cylinders cylinder cap；9, locking device；10, side piston is pushed away；11, side piston bar is pushed away；
12, hydraulic cylinder fastener；13, shear ram；14, well head；15, side piston bar is drawn；16, side piston is drawn；17, piston rod；18,
Assist the cylinder piston；19, side side door is drawn.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, unless otherwise specified and limited, it should be noted that term " installation ", " connected ",
" connection " shall be understood in a broad sense, for example, it may be mechanical connection or electrical connection, the connection being also possible to inside two elements can
It, can also be indirectly connected through an intermediary to be to be connected directly.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
As shown in Figure 1, a kind of unidirectional shearing preventer, the preventer includes a preventer shell 1, the preventer shell
The channel being connected to well head 14 is equipped in body 1, channel connection well head or standpipe, the two sides of the shell 1 have hole, mention
For the action channel of shear ram 13, moveable shear ram 13 is equipped in shell 1, shear ram 13 uses whole forging process
Manufacture, intermediate clear size of opening are greater than 14 size of well head and pass through for drilling tool, and 13 both sides of flashboard can receive the piston of two sides simultaneously
Effect, to the mobile shearing drilling tool in side, in flashboard 13 close to side is pushed away equipped with shearing knife edge, the two sides of shell 1, which are separately connected, pushes away side
Side door 2 and drawing side side door 19, the two sides of preventer shell 1 are respectively provided with hydraulic cylinder, and side is to push away side hydraulic cylinder 3, and the other side is to draw
The hydraulic cylinder of side hydraulic cylinder 5, two hydraulic cylinders is each provided at the outside of hydraulic cylinder, pushes away side hydraulic cylinder 3 and pushes away side hydraulic cylinder 4 and leads to
It crosses multiple hydraulic cylinders fastener 12 and is connect with side side door 2 is pushed away, push away side hydraulic cylinder 3 and push away side hydraulic cylinder 4 and push away between side side door 2
It is respectively equipped with sealing, draw side hydraulic cylinder 5 and side hydraulic cylinder 6 is drawn to connect respectively with side side door 19 is drawn by multiple hydraulic cylinders fastener
It connects, draws and be respectively equipped with sealing between side hydraulic cylinder 5 and drawing side hydraulic cylinder 6 and drawing side side door 19, draw the outside of side hydraulic cylinder 6
Equipped with auxiliary cylinders 7, draws and be linked to be series cylinder, auxiliary cylinders 7 and its auxiliary cylinders cylinder cap 8 between side hydraulic cylinder 5 and auxiliary cylinders 7 and draw
Sealing is respectively equipped between side hydraulic cylinder 6；It pushes away to be equipped with inside side hydraulic cylinder 3 and pushes away side piston 10, push away side piston 10 and pushing away side liquid
Can be moved horizontally inside cylinder pressure 3, it is described push away side piston 10 and be threadingly connected with push away side piston bar 11, push away side piston bar 11
Centre bore by pushing away side side door 2 is inserted into the inside of preventer shell 1, draws the inside of side hydraulic cylinder 5 to be equipped with and draws side piston 16, draws
Side piston 16 is mounted on the auxiliary the cylinder piston 18 inside auxiliary cylinders 7 by the connection of piston rod 17 and draws side piston 16 and auxiliary
The cylinder piston 18 is able to maintain synchronizing moving, draw side piston 16 by drawing side piston bar 15 to be fixedly connected with flashboard 13 to pulling and
Flashboard 13 is pushed, the rear portion of the preventer is equipped with locking device 9, and locking device 9 includes slender member and locking member, elongated
Component is located in the aperture for pushing away side piston 10 and can be mobile relative to side piston 10 is pushed away, and locking member can be relative to described
Side piston 10 is pushed away to move inward will push away side piston 10 and be locked in closed position.
Preferably, being bolted to connection between the shearing knife edge and flashboard 13.
Preferably, described push away side piston 10, draw side piston 16 and assist being respectively equipped with piston ring in the cylinder piston 18.
Preferably, the piston 18 that auxiliary cylinders 7 are smaller than drawing side hydraulic cylinder piston 16 using size.
Preferably, the hydraulic cylinder of preventer is respectively provided with hydraulic and seawater dual interface.
The present embodiment preventer case top setting flange hole can connect other equipment, and lower part setting flange may also connect
Other equipment are connect, in this embodiment, hydraulic oil enters from hydraulic oil port pushes away side hydraulic cylinder, draws side hydraulic from hydraulic oil port
Cylinder pushes away side piston and side piston is drawn to move right, and two side pistons are simultaneously by pushing away side piston bar and side piston bar being drawn to apply
Power pushes away side piston and applies thrust to flashboard, side piston is drawn to apply pulling force, the power direction that two side pistons apply to flashboard on flashboard
Identical, band piston moves right, and after contacting drilling tool, pushes drilling tool to move right, and shear drilling tool, when shear action completes it
Afterwards, reversely flashboard is pushed to move downward by drawing side piston, flashboard to side hydraulic cylinder inverse injection hydraulic oil is drawn by hydraulic oil port
Promotion pushes away side piston counter motion, returns to opening action that is in situ, completing ram block；When preventer needs big shearing force complete
When at shearing work, side series connection auxiliary hydraulic cylinder is being drawn, auxiliary hydraulic cylinder is connected with side hydraulic cylinder is drawn by fastener, is assisted
Hydraulic cylinder piston is connected by piston rod with side piston is drawn, and jointly to flashboard application pulling force, auxiliary hydraulic cylinder can be according to cutting
The piston of shear force needed using any size；Auxiliary hydraulic cylinder uses the piston smaller than drawing side hydraulic cylinder size, auxiliary hydraulic pressure
The power of cylinder can be provided, by hydraulic oil in seabed operation, can also be provided by seawater pressure, due to assisting the cylinder piston ratio
Draw hydraulic cylinder piston size in side small, after applying seawater pressure, ram block can also be by drawing side hydraulic cylinder reversely to apply
Hydraulic fluid pressure more than or equal to seawater pressure is pushed open, it can be ensured that ram block opening operation；Preventer setting it is hydraulic and
Seawater dual interface closes preventer as stand-by power using seawater pressure in hydraulic system fails, and operating water depth is deeper,
Seawater pressure is bigger；Ram block 13 is fabricated using monobloc forging part, and intermediate clear size of opening is greater than well head size, in lock
Close to side is pushed away equipped with shearing knife edge, blade is attached using other modes such as bolts with flashboard plate, can using intensity and firmly
Higher material is spent, and can be replaced after damage；Flashboard can pass through screw thread or other mechanical splices and drawing side phase
Even, it is not connected to side connecting rod is pushed away, when flashboard shear action, pushes away side piston and thrust is applied to flashboard by the way of contact, draw
Side piston applies pulling force to flashboard by connector, when flashboard is opened, side piston is drawn to apply thrust, flashboard to flashboard by connector
Apply thrust to side piston is pushed away by contact, so that all parts return to the position before shearing.When needing demolition and maintenance, flashboard
Can aspect with draw side piston extracted out out of preventer shell, replaced or safeguarded.
The principle that innovative two side pistons of use of the preventer that the present invention designs are acted to same direction, shell is by metal
Forging or casting are made, and suitable for being no more than the well head pressure of 25000Psi, temperature not higher than 177 DEG C has among shell
One channel, size determine that this channel passes through for drilling fluid according to the requirement of drilling well, for drilling tool provide by
Space, there are two the through-holes for flashboard movement at left and right sides of shell, and when flashboard is opened, hole and channel alignment on flashboard can be with
Normal drillng operation is carried out, when needing to shear and close preventer, flashboard moves to the right, shears drilling tool and close blowout prevention
Device；Compared to traditional preventer using the hydraulic inside principle for promoting flashboard to realize shearing in two sides, the preventer uses monolith
Flashboard, two side pistons are connected by piston rod with flashboard, and when needing shearing work, a side piston forms thrust to flashboard, separately
One side piston forms pulling force to flashboard, flashboard is pulled to drilling tool, and will bore by corresponding to inter-agency section on flashboard and shell
Tool is cut；Preventer of the invention with traditional preventer using same size piston and hydraulic pressure and flow,
2 times of the reachable traditional preventer of shearing force, according to the mode of series cylinder, 2.5 times of the reachable traditional preventer of shearing force
More than, any drilling tool in addition to drill bit can be cut, the side of the flashboard can be realized shearing, and flashboard can be with two sides
Piston is connected, and two side pistons provide power jointly for flashboard shearing, and flashboard can be torn open from wherein side hydraulic cylinder connecting interface
It unloads, safeguard or replaces, top sealing can be arranged according to the requirement of drillng operation in the flashboard, realize that same flashboard can be cut
The function of cutting and can shunt in a well after shearing, the shell side are provided with dismountable auxiliary shearing device, can be effective auxiliary
It helps shearing and can be replaced after being damaged；Scheme of the present invention due to using the equidirectional effect of double hydraulic cylinder, for
The pressure of side well head is drawn to become power, and the resistance approximate equilibrium that can be formed with the well head pressure for pushing away side, almost without tradition
The well head pressure of preventer forms the problem of resistance, and reduced resistance is equivalent to increased shearing force, while the present invention passes through
The scheme of series connection small-diameter hydraulic cylinder introduces seawater pressure as power, not only ensure that preventer works normally, but also can be by big
The ram block of closing is pushed back open state by the hydraulic of hydraulic cylinder, can satisfy by land and marine mining petroleum, natural
Safety shut-in well when gas and various mining drilling wells requires, and the working method of traditional preventer is changed from principle, but make
The requirement made is consistent with traditional preventer, does not increase manufacture difficulty, and existing industry level may be implemented to manufacture and test, in addition
The present invention is designed due to using single disc, only locking device need to be arranged in side.
In the description of this specification, the description meaning of reference term " one embodiment ", " example " or " some examples " etc.
Refer to that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or show
Example.Moreover, particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples
It can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is defined by the claims and their equivalents.
Claims (5)
1. a kind of unidirectional shearing preventer, the preventer includes a preventer shell, which is characterized in that the preventer shell
It is interior equipped with the channel being connected to well head, channel connection well head or standpipe, the two sides of the shell have hole, provide shearing
The action channel of flashboard, shell is interior to be equipped with moveable shear ram, and shear ram is fabricated using monobloc forging part, and intermediate is logical
Pore size is greater than well head size and passes through for drilling tool, and flashboard both sides can receive the piston of two sides while act on, to side moving shear
Drilling tool is cut, in flashboard close to side is pushed away equipped with shearing knife edge, the two sides of shell, which are separately connected, pushes away side side door and drawing side side door, preventer
The two sides of shell are respectively provided with hydraulic cylinder, and side is to push away side hydraulic cylinder, and the other side is to draw side hydraulic cylinder, the hydraulic cylinder of two hydraulic cylinders
Lid is each provided at the outside of hydraulic cylinder, pushes away side hydraulic cylinder and pushes away side hydraulic cylinder by multiple hydraulic cylinders fastener and push away side side door company
It connects, pushes away side hydraulic cylinder and push away side hydraulic cylinder and push away being respectively equipped with sealing between the side door of side, draw side hydraulic cylinder and draw side hydraulic cylinder
Lid by multiple hydraulic cylinders fastener respectively with draw side side door connect, draw side hydraulic cylinder and draw side hydraulic cylinder and drawing side side door it
Between be respectively equipped with sealing, draw the outside of side hydraulic cylinder to be equipped with auxiliary cylinders, draw and be linked to be liquid of connecting between side hydraulic cylinder and auxiliary cylinders
Sealing is respectively equipped between cylinder pressure, auxiliary cylinders and its auxiliary cylinders cylinder cap and drawing side hydraulic cylinder；It pushes away to be equipped with inside the hydraulic cylinder of side and push away
Side piston, pushing away side piston can move horizontally inside the hydraulic cylinder of side pushing away, it is described push away side piston and be threadingly connected with push away side
Piston rod pushes away the inside that side piston bar is inserted into preventer shell by pushing away the centre bore of side side door, the inside of side hydraulic cylinder is drawn to set
Have a drawing side piston, draw side piston to be mounted on the auxiliary the cylinder piston inside auxiliary cylinders by piston rod connection and draw side piston with
Auxiliary the cylinder piston is able to maintain synchronizing moving, draws side piston by drawing side piston bar to be fixedly connected with flashboard to pull and push
The rear portion of flashboard, the preventer is equipped with locking device, and locking device includes slender member and locking member, and slender member is located at
It pushes away in the aperture of side piston and can be mobile relative to side piston is pushed away, locking member can to push away side piston inside relative to described
It is mobile to be locked in closed position so that side piston pushed away.
2. preventer according to claim 1, which is characterized in that be bolted between the shearing knife edge and flashboard
Connection.
3. preventer according to claim 1, which is characterized in that described to push away side piston, draw side piston and auxiliary the cylinder piston
On be respectively equipped with piston ring.
4. preventer according to claim 1 to 3, which is characterized in that auxiliary cylinders are using size than drawing side hydraulic cylinder piston small
Piston.
5. preventer described in -4 according to claim 1, which is characterized in that it is double that the hydraulic cylinder of preventer is respectively provided with hydraulic and seawater
Reclosing mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811238422.7A CN109113635A (en) | 2018-10-23 | 2018-10-23 | A kind of unidirectional shearing preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811238422.7A CN109113635A (en) | 2018-10-23 | 2018-10-23 | A kind of unidirectional shearing preventer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109113635A true CN109113635A (en) | 2019-01-01 |
Family
ID=64855440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811238422.7A Pending CN109113635A (en) | 2018-10-23 | 2018-10-23 | A kind of unidirectional shearing preventer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109113635A (en) |
-
2018
- 2018-10-23 CN CN201811238422.7A patent/CN109113635A/en active Pending
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