CA2088794A1 - Portable blow out controller - Google Patents
Portable blow out controllerInfo
- Publication number
- CA2088794A1 CA2088794A1 CA 2088794 CA2088794A CA2088794A1 CA 2088794 A1 CA2088794 A1 CA 2088794A1 CA 2088794 CA2088794 CA 2088794 CA 2088794 A CA2088794 A CA 2088794A CA 2088794 A1 CA2088794 A1 CA 2088794A1
- Authority
- CA
- Canada
- Prior art keywords
- controller
- pipe
- sealing element
- set forth
- functional
- 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.)
- Abandoned
Links
- 238000007789 sealing Methods 0.000 claims abstract description 28
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 230000006835 compression Effects 0.000 claims description 14
- 238000007906 compression Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 125000006850 spacer group Chemical group 0.000 description 4
- 239000003921 oil Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920002449 FKM Polymers 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 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
Landscapes
- 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)
- Pipe Accessories (AREA)
- Manipulator (AREA)
Abstract
A blow out controller is provided which is functional to effect stoppage of the high pressure gases and/or fluids flowing from a wild well. The controller includes a mechanism for simultaneously sealing and gripping the outside wall of the well pipe.
Description
208879~
FIELD OF THE INVENTION
The present invention relates to an apparatus for controlling a wild oil or gas well wherein gases and/or fluids are discharging IL~ ,.n under high pressure. More speci~lcally, the blow out controller of the instant application may be utilized alone or, - optionally, with a conventional blow out preventor (BOP) mounted on top of the assembly.
~', BACKGROUND OF THE INVENTION
During the operation of any oil production well, there exists conslall~ly the hazardous possibility of the well getting out of control. Often, existing e~luiplt~ l is unable to seal off the fluid flow if, for example, the pressure control equipment is damaged or blown off, or where no anchoring structures eg. flanges for pressure control ~uiplll.,nl remain.
Additionally, this same situation may preside during the drilling of a well for the production of oil or gas.
A search of the prior art revealed the following patents of interests. In U.S.
. ~
patent 2,946,386, issued to M.R. Jones, there is described a latching overshot well blow out closure device which comprises a wrap-around seal and slips assembly. Above this assembly is provided a cylindrical overshot. A blow out preventor is secured to the top of the cylindrical overshot.
J.E. Eckel, in U.S. patent 2,793,700 discloses a cylindrical overshot for controlling wild wells. The overshot is adapted to receive a blow out preventor on the top thereof.
A blow out closure device pressure head is taught by J.E. Ortloff in U.S. patent 2,897,895. The device utilizes hydraulically, or otherwise remotely, actuated slips for gripping the pipe or casing. A sealant is utilized to secure a tight seal against the pipe as well as the slips. Final closure of the well is effected by the use of a conventional BOP mounted on top of the assembly. The Ortloff device, which to Applicant's best knowledge is one of the few commercially available controllers, has been found to be largely inoperative.
Prior to the present invention, there existed, therefore, the need for an operative device functional to bring blow outs under control. For example, during the fires of the oil wells in Kuwait, following the Kuwait-lraqi war of 1991, there existed no known technology for rapidly, relatively inexpensively and safely extinguishing said fires.
In developing the present invention, Applicant was obliged to work through ~r~
several plul~ly~es. The most notable of the earlier versions involved a device which provided hydraulically actuated slips in conjunction with a BOP. A cone member was positioned beneath tlle device, which member acted as a casing guide. No sealing element was provided.
Although the results proved satisfactory, it was determined, however, that deleteriously, the presence of the cone not only created lateral instability but also caused pressure dirrelenlials through the tool.
I
SUMMAI~Y OF THE INVENTION
It is an objective of the present invention to provide a blow out controller which "~\ is fully operative to effect stoppage of high pressure gases and/or fluids flow both during a ---~~ blow out or during the well drilling.
It is another objective to provide a blow out controller which may be positioned over a wild well from a distance and controlled remotely therefrom.
It is still a further objective to provide a blow out controller which may be utilized without the addition of a conventional BOP.
In accordance with the present invention there is provided a blow out controller functional to effect stoppage of the high pressure fluids flow from a wild well.
More specifically, the controller comprises a cylindrical body which defines an inner bore adapted to receive the pipe or casing.
A resilient, replaceable, circular sealing element, defining an inner bore is secured within a cavity formed in the body. Means are provided for co--~pres~ g the sealing -~- element into a flattened circular shape so that it is in gripping engagement around the periphery of the pipe. The sealing ring compression means would comprise, in combination, a compression ring extending across the top of said sealing element, and a plurality of a rod . .
compression members engaging said compression ring, said compression rods being reciprocable in a vertical direction.
Hydraulically actuated clamping slips are functional to move from a pipe-gripping position to a pipe-release position.
A plurality of pivotally mounted rocker arms interconnect the clamping slips and the hydraulic cylinder assemblies.
- Additionally, during its movement of travel, a section of said arms, proximal the pivotal connection to said clamping slips, are functional to engage said rod members - whereby simultaneous clamping and sealing of said pipe is effected. Preferably, the controller is further provided with means for controlling pressure leakage through the rocker arm ~ openings.
., r Without being bound by the same, it is believed that it is because of the simultaneous clamping and sealing actions, that the unit is so operatively ~ucees~,rul. It will be evident, therefore, that the device will either work effectively or fail, thus avoiding the situation where there is only a partial hydraulic seal with subsequent blowing off of the controller.
Broadly stated the invention relates to a blow out controller adapted for placPm~.nt over an upstanding pipe to thereby curb wild well blow outs which comprises, in combination, a cylindrical body defining an inner bore adapted to receive the pipe therein; a resilient sealing element positioned on the inner circulllrel~nce of said body, said sealing element being adapted to contract and expand against said pipe thereby coming into sealing engagement ~hel~wi~ll; retaining means functional to secure said sealing member within said body; clamp members functional to move into and out of gripping engagement with said pipe; and means for simultaneously ~tn~ting said clamping members and said sealing element whereby said controller clamps and seals said pipe.
. --- ~- - 5 DESCRIPTION OF THE DRAWINGS
Figure 1 is a perspective view of a blow out controller.
Figure 2 is a side sectional view of the controller of figure 1 in the release position.
Figure 3 is a side sectional view of the controller of figure 1, in the gripping position.
Figure 4 is a planar view of the controller of figure 1.
Figure 5 is a perspective view of the controller of figure 1 having the pressure leakage control means provided thereto.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Having reference to the acconl?anyillg drawings, there is illustrated the blow out controller 1.
The controller l defines a cylindrical body 2 which defines an inner bore adapted to receive the pipe 4. The body 2 defines an inner recess 2a therearound.
Positioned on top of the body 2 is a spacer ring 6 which will be described hereinafter.
A spacer spool 8 is secured to the top of the spacer ring 6 by means of bolts 7 which spool 8 is adapted for the connection of a conventional blind ram BOP thereto.
Returning now to the spacer ring 6, which is more clearly illustrated in figure 4, it can be seen that the ring 6 defines six elongate slots 10 extending the width thereof.
A transverse bore 12 extends on opposed sides of slots 10, which bore 12 is adapted to receive a pivot pin 14 therethrough. Pivot pin 14 is secured by means of studs 16.
Mounted substantially centrally on the pivot pin 14 is a rocker arm 20. At its outer end the rocker arm 20 defines a bore 21 adapted to receive a pivot pin 22. On to pin 22 is secured a piston rod 24 of a cylinder assembly 26. At its inner end, the rocker arm 20 defines a bore 27 adapted to receive a pivot pin 28. The pivot pin 28 extends through a circular bore in hinge point 30 which is in turn affixed to the slip 32. As will be clearly evident, six rocker arms 20 at spaced intervals are provided, althou~h fewer could be contemplated.
208879~
Slip 32 defines on its front face a horizontal serrated edge 32a and on its rear face 32b an inwardly angled rear face. The rear face 32b is angled to correspond to a tapered beam jaw lock 34.
Within the body recess 2a, there is positioned an annular sealing element 36.
The sealing element 36 is formed of a high LenlpeldLul~ composite. Typically, the material would be able to sustain temperatures ranging between 300 - 500~F. Exemplary m~.ri~l.c would comprise viton, high temperature silicon polymers, rubbers or the like.
The sealing element 36 is replaceably secured within the body recess 2a by means of a flange 38 and bolts 40.
Above the sealing element 36 there is positioned a compression ring 42. The ring 42 rest on the sealing element 36 being friction fitted within the body 2. An elongate compression rod 44 engages the compression ring 42 and is positioned within bore 2b being provided with a stop or seat thelewi~
- As stated earlier, a pressure leakage control means is preferably provided for the controller 1. More specifically, a top 46 adapted to be bo]ted on using the existing bolts 7. An outer tube 40 is fitted around the controller 1. The lower flange 38 is extended so as to engage the outer tube 40.
~In operation, actuation of the hydraulic cylinder 26 moves the rocker arm 20 downwardly, whilst simultaneously moving the compression rod 44 downwardly. The rocker arm 20 at its outer end moves the slips 32 into gripping engagement with the pipe 4. At the same time the compression rod 44 in association with the colnpl~s~ion ring 42 conlplesses the sealing element 36 into sealing engagement with the pipe 4. The sealing element 36, under compression assumes a flattened circular, or donut-shaped, configuration. Conversely, retraction of the piston rod 24 lowers the outer end of rocker arm 20, raising the slips 32 out of gripping engagement with the pipe 4. Simultaneously the compression rod 44 moves -upwardly releasing the compression rhlg 42 thereby causing the sealing element 36 to revert to the uncompressed configuration. It is to be noted that in order for the present device to be operative, it is preferable for there to be at least about eighteen inches of the pipe upstanding. A generally concentric annular opening, namely one within 10 - 15% of concentricity is preferred. Additionally, it would be preferred that no more than between 10 % to 15% belling of the outside diameter.
FIELD OF THE INVENTION
The present invention relates to an apparatus for controlling a wild oil or gas well wherein gases and/or fluids are discharging IL~ ,.n under high pressure. More speci~lcally, the blow out controller of the instant application may be utilized alone or, - optionally, with a conventional blow out preventor (BOP) mounted on top of the assembly.
~', BACKGROUND OF THE INVENTION
During the operation of any oil production well, there exists conslall~ly the hazardous possibility of the well getting out of control. Often, existing e~luiplt~ l is unable to seal off the fluid flow if, for example, the pressure control equipment is damaged or blown off, or where no anchoring structures eg. flanges for pressure control ~uiplll.,nl remain.
Additionally, this same situation may preside during the drilling of a well for the production of oil or gas.
A search of the prior art revealed the following patents of interests. In U.S.
. ~
patent 2,946,386, issued to M.R. Jones, there is described a latching overshot well blow out closure device which comprises a wrap-around seal and slips assembly. Above this assembly is provided a cylindrical overshot. A blow out preventor is secured to the top of the cylindrical overshot.
J.E. Eckel, in U.S. patent 2,793,700 discloses a cylindrical overshot for controlling wild wells. The overshot is adapted to receive a blow out preventor on the top thereof.
A blow out closure device pressure head is taught by J.E. Ortloff in U.S. patent 2,897,895. The device utilizes hydraulically, or otherwise remotely, actuated slips for gripping the pipe or casing. A sealant is utilized to secure a tight seal against the pipe as well as the slips. Final closure of the well is effected by the use of a conventional BOP mounted on top of the assembly. The Ortloff device, which to Applicant's best knowledge is one of the few commercially available controllers, has been found to be largely inoperative.
Prior to the present invention, there existed, therefore, the need for an operative device functional to bring blow outs under control. For example, during the fires of the oil wells in Kuwait, following the Kuwait-lraqi war of 1991, there existed no known technology for rapidly, relatively inexpensively and safely extinguishing said fires.
In developing the present invention, Applicant was obliged to work through ~r~
several plul~ly~es. The most notable of the earlier versions involved a device which provided hydraulically actuated slips in conjunction with a BOP. A cone member was positioned beneath tlle device, which member acted as a casing guide. No sealing element was provided.
Although the results proved satisfactory, it was determined, however, that deleteriously, the presence of the cone not only created lateral instability but also caused pressure dirrelenlials through the tool.
I
SUMMAI~Y OF THE INVENTION
It is an objective of the present invention to provide a blow out controller which "~\ is fully operative to effect stoppage of high pressure gases and/or fluids flow both during a ---~~ blow out or during the well drilling.
It is another objective to provide a blow out controller which may be positioned over a wild well from a distance and controlled remotely therefrom.
It is still a further objective to provide a blow out controller which may be utilized without the addition of a conventional BOP.
In accordance with the present invention there is provided a blow out controller functional to effect stoppage of the high pressure fluids flow from a wild well.
More specifically, the controller comprises a cylindrical body which defines an inner bore adapted to receive the pipe or casing.
A resilient, replaceable, circular sealing element, defining an inner bore is secured within a cavity formed in the body. Means are provided for co--~pres~ g the sealing -~- element into a flattened circular shape so that it is in gripping engagement around the periphery of the pipe. The sealing ring compression means would comprise, in combination, a compression ring extending across the top of said sealing element, and a plurality of a rod . .
compression members engaging said compression ring, said compression rods being reciprocable in a vertical direction.
Hydraulically actuated clamping slips are functional to move from a pipe-gripping position to a pipe-release position.
A plurality of pivotally mounted rocker arms interconnect the clamping slips and the hydraulic cylinder assemblies.
- Additionally, during its movement of travel, a section of said arms, proximal the pivotal connection to said clamping slips, are functional to engage said rod members - whereby simultaneous clamping and sealing of said pipe is effected. Preferably, the controller is further provided with means for controlling pressure leakage through the rocker arm ~ openings.
., r Without being bound by the same, it is believed that it is because of the simultaneous clamping and sealing actions, that the unit is so operatively ~ucees~,rul. It will be evident, therefore, that the device will either work effectively or fail, thus avoiding the situation where there is only a partial hydraulic seal with subsequent blowing off of the controller.
Broadly stated the invention relates to a blow out controller adapted for placPm~.nt over an upstanding pipe to thereby curb wild well blow outs which comprises, in combination, a cylindrical body defining an inner bore adapted to receive the pipe therein; a resilient sealing element positioned on the inner circulllrel~nce of said body, said sealing element being adapted to contract and expand against said pipe thereby coming into sealing engagement ~hel~wi~ll; retaining means functional to secure said sealing member within said body; clamp members functional to move into and out of gripping engagement with said pipe; and means for simultaneously ~tn~ting said clamping members and said sealing element whereby said controller clamps and seals said pipe.
. --- ~- - 5 DESCRIPTION OF THE DRAWINGS
Figure 1 is a perspective view of a blow out controller.
Figure 2 is a side sectional view of the controller of figure 1 in the release position.
Figure 3 is a side sectional view of the controller of figure 1, in the gripping position.
Figure 4 is a planar view of the controller of figure 1.
Figure 5 is a perspective view of the controller of figure 1 having the pressure leakage control means provided thereto.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Having reference to the acconl?anyillg drawings, there is illustrated the blow out controller 1.
The controller l defines a cylindrical body 2 which defines an inner bore adapted to receive the pipe 4. The body 2 defines an inner recess 2a therearound.
Positioned on top of the body 2 is a spacer ring 6 which will be described hereinafter.
A spacer spool 8 is secured to the top of the spacer ring 6 by means of bolts 7 which spool 8 is adapted for the connection of a conventional blind ram BOP thereto.
Returning now to the spacer ring 6, which is more clearly illustrated in figure 4, it can be seen that the ring 6 defines six elongate slots 10 extending the width thereof.
A transverse bore 12 extends on opposed sides of slots 10, which bore 12 is adapted to receive a pivot pin 14 therethrough. Pivot pin 14 is secured by means of studs 16.
Mounted substantially centrally on the pivot pin 14 is a rocker arm 20. At its outer end the rocker arm 20 defines a bore 21 adapted to receive a pivot pin 22. On to pin 22 is secured a piston rod 24 of a cylinder assembly 26. At its inner end, the rocker arm 20 defines a bore 27 adapted to receive a pivot pin 28. The pivot pin 28 extends through a circular bore in hinge point 30 which is in turn affixed to the slip 32. As will be clearly evident, six rocker arms 20 at spaced intervals are provided, althou~h fewer could be contemplated.
208879~
Slip 32 defines on its front face a horizontal serrated edge 32a and on its rear face 32b an inwardly angled rear face. The rear face 32b is angled to correspond to a tapered beam jaw lock 34.
Within the body recess 2a, there is positioned an annular sealing element 36.
The sealing element 36 is formed of a high LenlpeldLul~ composite. Typically, the material would be able to sustain temperatures ranging between 300 - 500~F. Exemplary m~.ri~l.c would comprise viton, high temperature silicon polymers, rubbers or the like.
The sealing element 36 is replaceably secured within the body recess 2a by means of a flange 38 and bolts 40.
Above the sealing element 36 there is positioned a compression ring 42. The ring 42 rest on the sealing element 36 being friction fitted within the body 2. An elongate compression rod 44 engages the compression ring 42 and is positioned within bore 2b being provided with a stop or seat thelewi~
- As stated earlier, a pressure leakage control means is preferably provided for the controller 1. More specifically, a top 46 adapted to be bo]ted on using the existing bolts 7. An outer tube 40 is fitted around the controller 1. The lower flange 38 is extended so as to engage the outer tube 40.
~In operation, actuation of the hydraulic cylinder 26 moves the rocker arm 20 downwardly, whilst simultaneously moving the compression rod 44 downwardly. The rocker arm 20 at its outer end moves the slips 32 into gripping engagement with the pipe 4. At the same time the compression rod 44 in association with the colnpl~s~ion ring 42 conlplesses the sealing element 36 into sealing engagement with the pipe 4. The sealing element 36, under compression assumes a flattened circular, or donut-shaped, configuration. Conversely, retraction of the piston rod 24 lowers the outer end of rocker arm 20, raising the slips 32 out of gripping engagement with the pipe 4. Simultaneously the compression rod 44 moves -upwardly releasing the compression rhlg 42 thereby causing the sealing element 36 to revert to the uncompressed configuration. It is to be noted that in order for the present device to be operative, it is preferable for there to be at least about eighteen inches of the pipe upstanding. A generally concentric annular opening, namely one within 10 - 15% of concentricity is preferred. Additionally, it would be preferred that no more than between 10 % to 15% belling of the outside diameter.
Claims (4)
1. A blowout controller adapted for placement over an upstanding pipe to thereby curb wild well blowouts which comprises, in combination;
a cylindrical body defining an inner bore adapted to receive said pipe therein;
a resilient sealing element positioned on the inner circumference of said body, said sealing element being adapted to contract and expand against said pipe thereby coming into sealing engagement therewith;
retaining means functional to secure said sealing member within said body;
clamping members functional to move into and out of gripping engagement with said pipe; and means for simultaneously actuating said clamping members and said sealing element whereby said controller substantially clamps and seals said pipe.
a cylindrical body defining an inner bore adapted to receive said pipe therein;
a resilient sealing element positioned on the inner circumference of said body, said sealing element being adapted to contract and expand against said pipe thereby coming into sealing engagement therewith;
retaining means functional to secure said sealing member within said body;
clamping members functional to move into and out of gripping engagement with said pipe; and means for simultaneously actuating said clamping members and said sealing element whereby said controller substantially clamps and seals said pipe.
2. The controller as set forth in claim 1 further comprising means associated with the upper section of said body for connecting a blowout preventor thereto.
3. The controller as set forth in claims 1 or 2 wherein said means for simultaneously actuating said clamping members and said sealing element comprises in combination, hydraulic rams functional to actuate a pluralility of rocker arms, slips operatively connected to said rocker arms, and compression rods operatively connected to said rocker arms.
4. The controller as set forth in claim 1 further comprising means for controlling pressure leakage of well fluids.
~. The controller as set forth in claim 3 further comprising means for controlling pressure leakage of well fluids.
~. The controller as set forth in claim 3 further comprising means for controlling pressure leakage of well fluids.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2088794 CA2088794A1 (en) | 1993-02-04 | 1993-02-04 | Portable blow out controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2088794 CA2088794A1 (en) | 1993-02-04 | 1993-02-04 | Portable blow out controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2088794A1 true CA2088794A1 (en) | 1994-08-05 |
Family
ID=4151100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2088794 Abandoned CA2088794A1 (en) | 1993-02-04 | 1993-02-04 | Portable blow out controller |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2088794A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003060288A1 (en) * | 2002-01-16 | 2003-07-24 | Norsk Hydro Asa | Riser control device |
| CN108413171A (en) * | 2018-05-02 | 2018-08-17 | 周庆兵 | A kind of hydraulic pressure quickly connects transmitter and its application method |
| US10087696B2 (en) | 2000-06-09 | 2018-10-02 | Oil Lift Technology Inc. | Polish rod locking clamp |
-
1993
- 1993-02-04 CA CA 2088794 patent/CA2088794A1/en not_active Abandoned
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10087696B2 (en) | 2000-06-09 | 2018-10-02 | Oil Lift Technology Inc. | Polish rod locking clamp |
| WO2003060288A1 (en) * | 2002-01-16 | 2003-07-24 | Norsk Hydro Asa | Riser control device |
| US7389817B2 (en) | 2002-01-16 | 2008-06-24 | Norsk Hydro Asa | Riser control device |
| CN108413171A (en) * | 2018-05-02 | 2018-08-17 | 周庆兵 | A kind of hydraulic pressure quickly connects transmitter and its application method |
| CN108413171B (en) * | 2018-05-02 | 2023-08-11 | 周庆兵 | Hydraulic quick-connection transmitter and application method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |