CN103466038A - Method for changing connecting tubes in FPSO (floating production storage and offloading) single-point buoys - Google Patents
Method for changing connecting tubes in FPSO (floating production storage and offloading) single-point buoys Download PDFInfo
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- CN103466038A CN103466038A CN2013103858490A CN201310385849A CN103466038A CN 103466038 A CN103466038 A CN 103466038A CN 2013103858490 A CN2013103858490 A CN 2013103858490A CN 201310385849 A CN201310385849 A CN 201310385849A CN 103466038 A CN103466038 A CN 103466038A
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Abstract
The invention relates to the field of production of offshore oil, in particular to a method for changing connecting tubes in FPSO (floating production storage and offloading) single-point buoys. The method aims at realizing inward rotation tower type single-point mooring. The method comprising the steps of lowering worn connecting tubes by using a long bolt and a hydraulic jack; then mounting a wire rope sling; and changing the single-point worn connecting tubes one by one by using an auxiliary winch arranged on the upper portion of a rotation tower. By the method for changing the connecting tubes in the FPSO single-point buoys, single-point flexible vertical tubes can be remounted or heads of the single-point flexible vertical tubes can be fixed before typhoon, so that the time for whole construction is prolonged, and the worn connecting tubes can be changed in a single-point manner even during typhoon. Moreover, because the auxiliary winch is arranged on the upper portion of the single-point rotation tower, relative motion does not exist, strict ship limiting operation is not required when the worn connecting tubes are lowered and new connecting tubes are lifted, construction risks can be reduced, and the construction cost for a ship is saved.
Description
Technical field
The present invention relates to the offshore oil production field, particularly about a kind of FPSO single-point floating drum inner connection tube replacing method that is object for inner cupola formula single buoy mooring system.
Background technology
FPSO is a kind of production, storage, outer defeated floating production storage unit of collecting, and by the inner cupola formula, single point mooring (SPM) is fixed, from the crude oil of wellhead platform extraction, through submerged pipeline, arrive subsea template, by single-point compliant riser, floating drum inner connection tube and rotating head, arrive FPSO and processed.Connection pipe is arranged in floating drum, carry the oil gas water of field produces, contain corrosion product in oil gas water, can corrode connection pipe, or, because of other reasons, cause needs to change connection pipe, this connection pipe is generally just prefabricated in the single-point floating drum in manufacturer, the marine operation complexity of changing, conventional arrangement and method for construction is to remove the rotating head module, utilizes single-point 300t winch out of my cabin to be changed the scheme of single-point connection pipe.Its weak point is: at first, this scheme is to consider in conjunction with the design at single-point initial stage, although safe, but the thing of dismantling is many, need dismounting submarine cable wiring slip ring, rotating head module carrier setting bolt, the outlet pipe nipples of oil pipe etc., work capacity is larger.Secondly, when lifting by crane with the 300t crane and transferring connection pipe, because the 300t winch is on the FPSO rotated, relative to capstan head, rotate, just need the operation of limit ship, and the operation of limit ship is stricter, in hoisting process, does not allow FPSO that rotation is arranged, therefore, this scheme needs two towing/anchor handling/supply vessels to be limit the ship operation.Moreover, if typhoon season, adopt this kind of method, run into typhoon when changing, because removed rotating head, need to be fixed and recover two compliant risers, accomplish that this point is very difficult, therefore adopt conventional approach to be changed reasonable 3～May in non-typhoon season and weather, the time window of changing the single-point connection pipe is very narrow.
Summary of the invention
Main purpose of the present invention is, for above-mentioned deficiency of the prior art, provides a kind of FPSO single-point floating drum inner connection tube replacing method, and it can reduce production time, realizes not freeing the replacing inner connection tube, reduces the marine operation risk.
The present invention solves the technical scheme that the prior art problem adopts: a kind of FPSO single-point floating drum inner connection tube replacing method, and it comprises the following steps:
Dead work before S1, replacing:
The test of S11, single-point capstan head, tightening after the dismounting of in place, the seal capsule of the installation location of auxiliary hoist, pulley blind plate, temporary fixed loosened screw;
S12, on-the-spot fender, construction ship and the floating storage unit heaving pile installed of construction ship put in place, drag the stern ship to drag stern limit ship;
S13, connection pipe be the cleaning of tie bolt, hanger and marine life under water, and Current Collector Sleave has been laid under water, and compliant riser is fixed;
S2, dismantle old connection pipe:
S21, personnel waterborne pine connection pipe upper flange tie bolt, personnel slowly loosen the fixedly guide chain of flexible steel in flat section tubing under water, make old connection pipe in floating drum move down certain distance, personnel waterborne tighten connection pipe upper flange tie bolt again, and personnel strain fixedly guide chain of compliant riser under water;
S22, personnel are by hydraulic tool dismounting compliant riser connecting screw under water, loose guide chain, compliant riser and butt flange disengagement, upper compliant riser blind plate, fastening after, connect snubber chain;
S23, upper connection pipe bottom blind plate, fastening after, connect the both sides snubber chain, prevent that old connection pipe from falling into marinely, loose six roots of sensation connection pipe upper flange tie bolt, change long bolt, then other bolts taking off of slowly coming loose, and then loose long bolt slowly;
S24, by old connection pipe slowly toward transferring, first-class jack frock, with hydraulic jack, slowly transfer, and first-class hanger blind plate, connect steel rope and hang old connection pipe, unclamp blind plate snubber chain under connection pipe, slowly transfer steel rope, make old connection pipe fully from tapered drum out, with on be arranged in the suspender belt of floating drum periphery, slowly transfer steel rope, old connection pipe is arrived under water, the diver unties the auxiliary hydraulic pressure winch cable, is with winch cable on towing/anchor handling/supply vessel, slowly tightens up winch cable on towing/anchor handling/supply vessel;
The suspender belt that S25, diver untie the floating drum periphery slowly tightens up winch cable on towing/anchor handling/supply vessel, and old connection pipe is dragged to upper tugboat.
S3, more renew connection pipe:
Conduit sealed bottom junction in S31, inspection single-point cone buoy, and clean out, dismantle the connection pipe blind plate simultaneously;
S32, new connection pipe Duct fixing clamp, temporary fixed, seal capsule dismounting, new connection pipe tube-in-tube annular space welding steel, and coat gasket coating, new connection pipe both sides dress blind plate and stripper rubber;
S33, new connection pipe is hung to lower operation support ship, on boat deck, the mark suspension centre on old connection pipe is moved on new connection pipe, simultaneously, coordinate and hang water under new connection pipe with winch on larboard crane and workboat, new connection pipe is dragged to the towing/anchor handling/supply vessel limit, and fixedly tighten up front mooring fast, allow towing/anchor handling/supply vessel slowly slide to the stem place;
S34, diver connect new connection pipe to 40 meters suspender belts on the cone buoy limit, and slowly loose towing/anchor handling/supply vessel auxiliary hoist, send new connection pipe to the cone buoy bottom;
S35, diver are with the auxiliary hoist steel rope, untie the towing/anchor handling/supply vessel winch cable, load onto water wings, slowly tighten up the auxiliary hoist steel rope, mention near the cone buoy bottom, the diver unties the suspender belt of cone buoy periphery, and confirm new connection pipe direction, new connection pipe is entered in cone buoy, then hang up the blind plate snubber chain of new connection pipe bottom, untie water wings;
S36, diver slowly loosen the blind plate snubber chain, confirm new connection pipe correct position, adjust to correct position, and the jack frock is installed, and with hydraulic jack, withstand new connection pipe;
S37, installation long bolt, simultaneously, dismounting auxiliary hoist steel rope, hanger blind plate, pulley blind plate, slowly fastening long bolt screw, make new connection pipe in place;
S38, mounting flange bolt, and in addition fastening, simultaneously, the dismounting long bolt, change normal bolt, and in addition fastening; Unclamp the blind plate snubber chain of new connection pipe bottom, and dismounting bottom blind plate, change guide bolt;
S39, flange docking put in place, and load connecting bolt and packing ring are also fastening, tear guide bolt open, and fastening new bolt is installed, and new connection pipe installs.
Below above technical scheme is further elaborated:
As preferably, auxiliary hoist described in step S11 is installed on the top of described single-point capstan head.
As preferably, the blind plate of pulley described in step S11 comprises blind plate and is fixed in the pulley of blind plate lower end, described blind plate upper shed, bearing is laid on blind plate top, described bearing is for controlling the rotation of described pulley, and described pulley blind plate is arranged on the lower end of the ESD valve flange be connected with described connection pipe upper flange; Described hanger blind plate is installed on the upper end of described connection pipe upper flange.
The invention has the beneficial effects as follows:
One, the present invention adopt long bolt and hydraulic jack alternately to transfer old connection pipe, then Current Collector Sleave is installed, and utilize the auxiliary hoist that is arranged on capstan head top to change one by one the old connection pipe of single-point.Can before typhoon, recover the single-point compliant riser or single-point compliant riser tube head is fixed, therefore, having widened the time window of whole construction, even also can implement the replacing of the old connection pipe of single-point during typhoon season.
Two, auxiliary hoist is arranged on the top of single-point capstan head, because there is no relative motion, when transferring old connection pipe and mentioning new connection pipe, does not just need strict limit ship operation like this, can reduce the risk in construction, saves the executive cost of a ship.
The accompanying drawing explanation
Fig. 1 is the diagram of circuit of FPSO single-point floating drum inner connection tube replacing method of the present invention;
Fig. 2 is the structural representation of old connection pipe initial condition described in the present invention;
Fig. 3 is the structural representation after old connection pipe described in the present invention is transferred;
Fig. 4 is the structural representation that the frock of jack described in the present invention, jack and long bolt are laid; Fig. 5 is the planar structure schematic diagram of the blind plate of pulley described in the present invention.
The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
Wherein, auxiliary hoist 1, pulley blind plate 2, old connection pipe 3, connection pipe upper flange 4, jack frock 5, hydraulic jack 6, hanger blind plate 7, auxiliary hoist steel rope 8, cone buoy 9, long bolt 10.
The specific embodiment
Describe technical scheme of the present invention in detail below with reference to drawings and the specific embodiments, so as clearer, understand invention essence of the present invention intuitively.
Shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, FPSO single-point floating drum inner connection tube replacing method of the present invention, it comprises the following steps:
Dead work before S1, replacing:
The test of S11, single-point capstan head, make and guarantee that the single-point capstan head normally moves, tightening after the dismounting of in place, the seal capsule of the installation location of auxiliary hoist 1, pulley blind plate 2, temporary fixed loosened screw;
S12, the on-the-spot installation of construction ship fender, reverse heaving pile put in place, drag the stern ship to drag stern limit ship;
S13, connection pipe under water tie bolt, hanger and sub sea biology cleaning, Current Collector Sleave has been laid under water, compliant riser fixing;
S2, dismantle old connection pipe 3:
The tie bolt of S21, personnel waterborne pine connection pipe upper flange 4, personnel slowly loosen the fixedly guide chain of flexible steel in flat section tubing under water, make the interior old connection pipe 3 of cone buoy 9 move down certain distance, personnel waterborne tighten the tie bolt of connection pipe upper flange 4 again, and personnel strain fixedly guide chain of compliant riser under water;
S22, personnel are by hydraulic tool dismounting compliant riser connecting screw under water, loose guide chain, compliant riser and 4 disengagements of connection pipe upper flange, upper compliant riser blind plate, fastening after, connect snubber chain;
S23, upper connection pipe bottom blind plate, fastening after, connect the both sides snubber chain, prevent that old connection pipe 3 from falling into marinely, the tie bolt of loose six roots of sensation connection pipe upper flange 4, change long bolt 10, then other bolts taking off of slowly coming loose, and then loose long bolt 10 slowly;
S24, by old connection pipe 3 slowly toward transferring, first-class jack frock 5, with hydraulic jack 6, slowly transfer, and first-class pulley and hanger blind plate 7, connect steel rope and hang old connection pipe 3, unclamp the lower blind plate snubber chain of old connection pipe 3, slowly transfer steel rope, make old connection pipe 3 fully from cone buoy 9 out, with on be arranged in cone buoy 9 peripheries suspender belt and water wings slowly transfer steel rope, old connection pipe 3 is arrived under water, the diver unties auxiliary hoist steel rope 8, be with winch cable on towing/anchor handling/supply vessel, slowly tighten up winch cable on towing/anchor handling/supply vessel,
The suspender belt that S25, diver untie the floating drum periphery slowly tightens up auxiliary hoist steel rope 8 on towing/anchor handling/supply vessel, and old connection pipe 3 is dragged to upper tugboat;
S3, more renew connection pipe:
Conduit sealed bottom junction in S31, inspection cone buoy 9, and clean out, dismantle the connection pipe blind plate simultaneously;
S32, new connection pipe Duct fixing clamp, temporary fixed, seal capsule dismounting, new connection pipe tube-in-tube annular space welding steel, and coat gasket coating, connection pipe both sides dress blind plate and stripper rubber;
S33, new connection pipe is hung to lower operation support ship, on boat deck, the mark suspension centre on old connection pipe 3 is moved on new connection pipe, simultaneously, coordinate and hang water under new connection pipe with winch on larboard crane and workboat, new connection pipe is dragged to the towing/anchor handling/supply vessel limit, and fixedly tighten up front mooring fast, allow towing/anchor handling/supply vessel slowly slide to the stem place;
S34, diver connect new connection pipe to 40 meters suspender belts on cone buoy 9 limits, and slowly loose towing/anchor handling/supply vessel auxiliary hoist 1, send new connection pipe to cone buoy 9 bottoms;
S35, diver are with auxiliary hoist steel rope 8, untie the towing/anchor handling/supply vessel winch cable, load onto water wings, slowly tighten up auxiliary hoist steel rope 8, mention near cone buoy 9 bottoms, the diver unties the suspender belt of cone buoy 9 peripheries, and confirm new connection pipe direction, new connection pipe is entered in cone buoy 9, then hang up connection pipe bottom blind plate snubber chain, untie water wings;
S36, diver slowly loosen snubber chain, confirm new connection pipe correct position, adjust to correct position, and jack frock 5 is installed, and with hydraulic jack 6, withstand connection pipe;
S37, installation long bolt 10, simultaneously, dismounting auxiliary hoist steel rope 8, hanger blind plate 7, pulley blind plate 2, slowly fastening long bolt screw, make new connection pipe in place;
S38, mounting flange bolt, and in addition fastening, simultaneously, dismounting long bolt 10, change normal bolt, and in addition fastening; Unclamp new connection pipe bottom snubber chain, and dismounting bottom blind plate, change guide bolt;
S39, flange docking put in place, and load connecting bolt and packing ring are also fastening, tear guide bolt open, and fastening new bolt is installed, and new connection pipe installs.
Further it should be noted that, auxiliary hoist described in step S11 1 is installed on the top of single-point capstan head, makes and there is no relative motion, by this, when transferring old connection pipe 3 and mentioning new connection pipe, do not need strict limit ship operation, can reduce the risk in construction, save the expense of a ship.
Simultaneously, the blind plate of pulley described in step S11 2 comprises blind plate 21 and is fixed in the pulley 22 of blind plate 21 lower ends, described blind plate 21 upper sheds, and bearing 23 is laid on blind plate 21 tops, and described pulley 22 is realized rotating by described bearing 23; Described pulley blind plate 2 is arranged on the lower end of the ESD valve flange be connected with described connection pipe upper flange 4; Described hanger blind plate 7 is installed on the upper end of described connection pipe upper flange 4, by this, pulley blind plate 2 is corresponding with the upper-lower position of hanger blind plate 7, wear auxiliary hoist steel rope 8 in pulley 22, auxiliary hoist 1 can well be controlled auxiliary hoist steel rope 8 and drive transferring of cone buoys 9, make move down old connection pipe 3 and new connection pipe be installed very convenient.
In sum, FPSO single-point floating drum inner connection tube replacing method of the present invention, adopt long bolt 10 and hydraulic jack 6 alternately to transfer old connection pipe 3, Current Collector Sleave is installed again, utilization is arranged on the auxiliary hoist 1 on capstan head top and changes one by one the old connection pipe 3 of single-point, can before typhoon, recover the single-point compliant riser or single-point compliant riser tube head is fixed, therefore, widened the time window of whole construction, even also can implement the replacing of the old connection pipe 3 of single-point during typhoon season, simultaneously, auxiliary hoist 1 is arranged on the top of single-point capstan head, because there is no relative motion, like this when transferring old connection pipe 3 and mentioning new connection pipe, just do not need strict limit ship operation, can reduce the risk in construction, save the executive cost of a ship.
The foregoing is only the preferred embodiments of the present invention; not thereby limit its scope of the claims; every equivalent structure or conversion of equivalent flow process that utilizes specification sheets of the present invention and accompanying drawing content to do; directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present invention.
Claims (3)
1. a FPSO single-point floating drum inner connection tube replacing method, is characterized in that, it comprises the following steps:
Dead work before S1, replacing:
The test of S11, single-point capstan head, tightening after the dismounting of in place, the seal capsule of the installation location of auxiliary hoist, pulley blind plate, temporary fixed loosened screw;
S12, on-the-spot fender, construction ship and the floating storage unit heaving pile installed of construction ship put in place, drag the stern ship to drag stern limit ship;
S13, connection pipe be the cleaning of tie bolt, hanger and marine life under water, and Current Collector Sleave has been laid under water, and compliant riser is fixed;
S2, dismantle old connection pipe:
S21, personnel waterborne pine connection pipe upper flange tie bolt, personnel slowly loosen the fixedly guide chain of flexible steel in flat section tubing under water, make old connection pipe in floating drum move down certain distance, personnel waterborne tighten connection pipe upper flange tie bolt again, and personnel strain fixedly guide chain of compliant riser under water;
S22, personnel are by hydraulic tool dismounting compliant riser connecting screw under water, loose guide chain, compliant riser and butt flange disengagement, upper compliant riser blind plate, fastening after, connect snubber chain;
S23, upper connection pipe bottom blind plate, fastening after, connect the both sides snubber chain, prevent that old connection pipe from falling into marinely, loose six roots of sensation connection pipe upper flange tie bolt, change long bolt, then other bolts taking off of slowly coming loose, and then loose long bolt slowly;
S24, by old connection pipe slowly toward transferring, first-class jack frock, with hydraulic jack, slowly transfer, and first-class hanger blind plate, connect steel rope and hang old connection pipe, unclamp blind plate snubber chain under connection pipe, slowly transfer steel rope, make old connection pipe fully from tapered drum out, with on be arranged in the suspender belt of floating drum periphery, slowly transfer steel rope, old connection pipe is arrived under water, the diver unties the auxiliary hydraulic pressure winch cable, is with winch cable on towing/anchor handling/supply vessel, slowly tightens up winch cable on towing/anchor handling/supply vessel;
The suspender belt that S25, diver untie the floating drum periphery slowly tightens up winch cable on towing/anchor handling/supply vessel, and old connection pipe is dragged to upper tugboat;
S3, more renew connection pipe:
Conduit sealed bottom junction in S31, inspection single-point cone buoy, and clean out, dismantle the connection pipe blind plate simultaneously;
S32, new connection pipe Duct fixing clamp, temporary fixed, seal capsule dismounting, new connection pipe tube-in-tube annular space welding steel, and coat gasket coating, new connection pipe both sides dress blind plate and stripper rubber;
S33, new connection pipe is hung to lower operation support ship, on boat deck, the mark suspension centre on old connection pipe is moved on new connection pipe, simultaneously, coordinate and hang water under new connection pipe with winch on larboard crane and workboat, new connection pipe is dragged to the towing/anchor handling/supply vessel limit, and fixedly tighten up front mooring fast, allow towing/anchor handling/supply vessel slowly slide to the stem place;
S34, diver connect new connection pipe to 40 meters suspender belts on the cone buoy limit, and slowly loose towing/anchor handling/supply vessel auxiliary hoist, send new connection pipe to the cone buoy bottom;
S35, diver are with the auxiliary hoist steel rope, untie the towing/anchor handling/supply vessel winch cable, load onto water wings, slowly tighten up the auxiliary hoist steel rope, mention near the cone buoy bottom, the diver unties the suspender belt of cone buoy periphery, and confirm new connection pipe direction, new connection pipe is entered in cone buoy, then hang up the blind plate snubber chain of new connection pipe bottom, untie water wings;
S36, diver slowly loosen the blind plate snubber chain, confirm new connection pipe correct position, adjust to correct position, and the jack frock is installed, and with hydraulic jack, withstand new connection pipe;
S37, installation long bolt, simultaneously, dismounting auxiliary hoist steel rope, hanger blind plate, pulley blind plate, slowly fastening long bolt screw, make new connection pipe in place;
S38, mounting flange bolt, and in addition fastening, simultaneously, the dismounting long bolt, change normal bolt, and in addition fastening; Unclamp the blind plate snubber chain of new connection pipe bottom, and dismounting bottom blind plate, change guide bolt;
S39, flange docking put in place, and load connecting bolt and packing ring are also fastening, tear guide bolt open, and fastening new bolt is installed, and new connection pipe installs.
2. FPSO single-point floating drum inner connection tube replacing method according to claim 1, is characterized in that, auxiliary hoist described in step S11 is installed on the top of described single-point capstan head.
3. FPSO single-point floating drum inner connection tube replacing method according to claim 1, it is characterized in that, the blind plate of pulley described in step S11 comprises blind plate and is fixed in the pulley of blind plate lower end, described blind plate upper shed, bearing is laid on blind plate top, described bearing is for controlling the rotation of described pulley, and described pulley blind plate is arranged on the lower end of the ESD valve flange be connected with described connection pipe upper flange; Described hanger blind plate is installed on the upper end of described connection pipe upper flange.
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| CN201310385849.0A CN103466038B (en) | 2013-08-30 | 2013-08-30 | A kind of FPSO single-point cone buoy inner connection tube replacing options |
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| CN201310385849.0A CN103466038B (en) | 2013-08-30 | 2013-08-30 | A kind of FPSO single-point cone buoy inner connection tube replacing options |
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| CN104070343A (en) * | 2014-06-18 | 2014-10-01 | 江西铜业股份有限公司 | Replacing method of base plate and lining plate of ore storage bin of ore feeder |
| CN106522182A (en) * | 2016-10-20 | 2017-03-22 | 长江重庆航道管理处 | Method utilizing float to replace buoy and clear tangled object on steel cable |
| CN108058793A (en) * | 2017-12-08 | 2018-05-22 | 中船黄埔文冲船舶有限公司 | A kind of method of underwater quick-replaceable sounding instrument |
| CN108581357A (en) * | 2018-03-20 | 2018-09-28 | 上海二十冶建设有限公司 | The easy device and its application method of the quick group pair of the pipeline that reuses |
| CN113307154A (en) * | 2021-04-21 | 2021-08-27 | 海洋石油工程股份有限公司 | Combined monitoring method suitable for small-gap hoisting of large-sized structure |
| CN113772044A (en) * | 2021-09-28 | 2021-12-10 | 中海石油技术检测有限公司 | Offshore single-point mooring replacement and maintenance method |
| CN114906759A (en) * | 2022-05-06 | 2022-08-16 | 南京银茂铅锌矿业有限公司 | Method for lowering flexible pipeline by using friction type winch shaft |
| CN116944774A (en) * | 2023-07-28 | 2023-10-27 | 招商局重工（江苏）有限公司 | Method for installing lower slip ring of inner turret of FPSO |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104070343A (en) * | 2014-06-18 | 2014-10-01 | 江西铜业股份有限公司 | Replacing method of base plate and lining plate of ore storage bin of ore feeder |
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| CN113307154A (en) * | 2021-04-21 | 2021-08-27 | 海洋石油工程股份有限公司 | Combined monitoring method suitable for small-gap hoisting of large-sized structure |
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| CN113772044B (en) * | 2021-09-28 | 2023-10-31 | 中海石油技术检测有限公司 | Offshore single point mooring replacement maintenance method |
| CN114906759A (en) * | 2022-05-06 | 2022-08-16 | 南京银茂铅锌矿业有限公司 | Method for lowering flexible pipeline by using friction type winch shaft |
| CN114906759B (en) * | 2022-05-06 | 2023-10-03 | 南京银茂铅锌矿业有限公司 | Method for lowering flexible pipeline by friction type hoisting shaft |
| CN116944774A (en) * | 2023-07-28 | 2023-10-27 | 招商局重工（江苏）有限公司 | Method for installing lower slip ring of inner turret of FPSO |
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| CN103466038B (en) | 2016-01-20 |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: CNOOC (China) Limited Zhanjiang Branch Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 China oil tower, 25 Chaoyangmen North Street, Dongcheng District, Beijing Co-patentee before: CNOOC (China) Limited Zhanjiang Branch Patentee before: China National Offshore Oil Corporation |
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