CA1294495C - Deepwater floating drilling and production facility incorporating flexible production risers - Google Patents
Deepwater floating drilling and production facility incorporating flexible production risersInfo
- Publication number
- CA1294495C CA1294495C CA000537593A CA537593A CA1294495C CA 1294495 C CA1294495 C CA 1294495C CA 000537593 A CA000537593 A CA 000537593A CA 537593 A CA537593 A CA 537593A CA 1294495 C CA1294495 C CA 1294495C
- Authority
- CA
- Canada
- Prior art keywords
- platform
- template
- well
- templates
- mooring lines
- 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.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 238000005553 drilling Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000012423 maintenance Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002311 subsequent effect Effects 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000004804 winding Methods 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
- B63B1/107—Semi-submersibles; Small waterline area multiple hull vessels and the like, e.g. SWATH
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/08—Underwater guide bases, e.g. drilling templates; Levelling thereof
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/12—Underwater drilling
- E21B7/128—Underwater drilling from floating support with independent underwater anchored guide base
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Ocean & Marine Engineering (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method of using a floating platform in deep (1000-3000 feet) water as a drilling/workover and production platform. By interconnecting the subsea wellheads of at least one template to the platform using flexible production risers connected through a reverse loop, the platform may be adjusted on its moorings to position the platform directly over a second template for subsequent drilling or workover.
This eliminates the additional expense of separate drilling platforms and workboats. Further, wells of separate templates can be serviced separately and the entire field production need not be completely curtailed during such a workover.
A method of using a floating platform in deep (1000-3000 feet) water as a drilling/workover and production platform. By interconnecting the subsea wellheads of at least one template to the platform using flexible production risers connected through a reverse loop, the platform may be adjusted on its moorings to position the platform directly over a second template for subsequent drilling or workover.
This eliminates the additional expense of separate drilling platforms and workboats. Further, wells of separate templates can be serviced separately and the entire field production need not be completely curtailed during such a workover.
Description
~2~44~5 Case No.: 7062 A DEEPWATER FLOATING DRILLING AND PRODUCTION FACILITY INCOR-PORATING FLEXIBLE PRODUCTION RISERS
Background and Summary of the Invention The present invention relates to a method of utilizing a floating platform in deep water as a combination drilling/workover and production platform. More particu-larly, the present invention is directed to the use of a floating platform (preferably, a semisubmersible) in 1000 feet (305m) to 3000 feet (915m) of water, which is interconnected to completed wells of a template by flexible risers using a reverse loop configuration, by adjusting the mooring of the platform to position it directly over a template to permit additional drilling or workover without curtailing production from wells of other templates.
- As the search for offshore oil moves into deeper water, the costs associated with producing that oil also increase. In fact, costs typically increase at a faster rate than the linear increase in water depth. This is especially true for conventional fixed platforms. These increasing costs require an increase in the size of proven oil reserves in order to justify proceeding beyond the ~0 initial exploration phase. Costs associated with operating an offshore drilling platform typically can exceed $100,000 per day. Unless ways can be developed to reduce drilling costs and accelerate return by offering early production, an increasing number of offshore fields with marginal re-serves will not be produced. This problem has been exacer-bated by the recent slide in oil prices.
The method of the present invention provides reduction in costs by eliminating the need for a separate drilling platform. Further, this method takes advantage of the lower costs associated with floating platforms and enables early initial production from a first well template ~k .
~.
- ~
, `: . '' "'' ~ :.' , .
while additional drllling is performed on a second or subse-quent template. In addition, the same floating platform is used for workovers to reduce maintenance costs without interrupting production from wells of other templates.
Finally, the floating platform can be deballasted for mainte-nance without curtailing production.
While the use of flexible risers to interconnect subsea wells to floating production platforms is becoming conventional, the present invention incorporates the "benefit" of the mobility of the platform resulting from mooring in deep water (normally considered a drawback), to enable the platform to perform the additional drilling and workover functions. When moored in water on the order of from 1000 to 3000 feet (305 to 915 meters) deep, there is sufficient flexibility in the moorings to permit the position of the floating platform to be adjusted to lie directly above any of several well templates positioned on the ocean floor for drilling or workover. Templates may be spaced apart by 300 feet (91.5m) without causing the riser to deviate from vertical by more than 17 (in 1000 ft water depth, 6 in 3000 ft), an angle easily accomo-dated by flexible risers. By configuring the flexible risers in a reverse loop, even these relatively small angles will be substantially reduced. This combined flexibility ~5 in moorings and production riser capability also permits the floating platform to be deballasted to permit certain portions that normally occupy subsurface positions to extend above the surface for inspection and maintenance, without curtailing production.
3a Various other characteristics, features and advan-tages of the present invention will become apparent after a reading of the following description.
Brief Description of the Drawings The Figure is a schematic side elevational view of a floating production platform utilizing the method of the present invention, the drilling/workover position . . ' ... . . . .
3~
being shown in solid line, the normal production position being shown in phantom.
Detailed Description of the Preferred Embodiment(s) The method of the present invention is adaptable for usage with any floating production facility. It is preferred that a semisubmersible platform 12 be utilized in this method. A plurality of mooring lines 14 (typically eight or more, only two have been shown to simplify the drawing) secure platform 12 in position above templates 16 and 18 by virtue of attachments 20 to the ocean floor.
Flexible production riser(s) 26 interconnect template 16 to platform 12. A rigid production riser section 28 traverses the zone (typically 20 to 30 feet) that is sub~ected to wave battering to extend riser life. The flexible riser 26 is depicted in the Figure in a reverse loop configuration that enhances the flexibility of the system. The use of a flexible riser obviates the need for motion compensation devices typically required with rigid risers and a floating production platform. The reverse loop configuration increases the amount of both lateral and vertical movement of which the platform is capable.
The utilization of the flexibility afforded in the moorings in 1000 to 3000 feet water depths (normally considered a problem to be overcome), with the flexible risers affords a platform that can be utilized simultaneously as a produc-tion facility and a drilling/workover rig. The flexible riser 26 may be a single conduit carrying the consolidated flow from a manifold located in proximity to the template 16 if subsea wellheads are used; or the flexible riser may be a bundle of conduits carrying production from the individual wells to wellheads located on the platform 12.
Platform 12 is ghosted into its normal position generally centered above its well templates 16 and 18.
By adjusting the mooring lines 14, that is, tightening some while slackening others, the position of the platform may be adjusted to bring it directly above one of the well , .
:
'` :
, templates 18 as shown in the Figure. This enables drilling or workover equipment to be lowered into a well bore through a vertically positioned casing 22 from derrick 24. This mooring adjustment might be accomplished, for e~ample, by coiling and uncoiling the mooring lines to and from winding drums (not shown).
While it is preferred that simultaneous production and drilling/workover not be accomplished on a single tem-plate (for safety reasons), there is no reason a platform could not be used to drill/workover one template while simultaneously producing from another, particularly if production is to a location outboard of the drilling derrick axis. sy adjusting the moorings and continuing production from other templates as described, several economic benefits are obtained: a) only a portion of production need be curtailed during workover and, b) a separate workover unit (with the aforementioned cost of $100,000 per day) is not needed.
The flotation columns of platform 12 can be debal-lasted in calm weather to enable portions of the platform normally occupying subsurface positions to be raised above the level of the water for inspection and maintenance, as necessary. The flexibility of the mooring system and production risers enables this maintenance to occur without disengaging the risers or curtailing production. Further, should it be necessary to deballast from the operational to the survival mode for a hundred year storm or the like, no adjustment or disconnection of the production risers is necessary to accomodate the change of platform position.
Although in describing the method of the present invention, lateral displacement of the platform in only one plane has been discussed, it will of course be understood that displacement in the second plane (into and out of the plane of the Figure) is also possible. Accordingly, the present method can accomodate four (or more) separate well templates with associated satellite wells. If four .. .
', ' , ~ .
. ~ .
templates are used, it is preferred that they be generally positioned at the corners of a square. Such a combination drilling/workover and production platform could accomodate on the order of 32 wells with a combined production of about 80,000 barrels of oil per day.
Various changes, modifications and alternatives will become apparent to one of ordinary skill in the art following a readlng of the foregoing specification. It is intended that all such changes, modifications and alter-natives as come within the scope of the appended claims be considered part of this invention.
Background and Summary of the Invention The present invention relates to a method of utilizing a floating platform in deep water as a combination drilling/workover and production platform. More particu-larly, the present invention is directed to the use of a floating platform (preferably, a semisubmersible) in 1000 feet (305m) to 3000 feet (915m) of water, which is interconnected to completed wells of a template by flexible risers using a reverse loop configuration, by adjusting the mooring of the platform to position it directly over a template to permit additional drilling or workover without curtailing production from wells of other templates.
- As the search for offshore oil moves into deeper water, the costs associated with producing that oil also increase. In fact, costs typically increase at a faster rate than the linear increase in water depth. This is especially true for conventional fixed platforms. These increasing costs require an increase in the size of proven oil reserves in order to justify proceeding beyond the ~0 initial exploration phase. Costs associated with operating an offshore drilling platform typically can exceed $100,000 per day. Unless ways can be developed to reduce drilling costs and accelerate return by offering early production, an increasing number of offshore fields with marginal re-serves will not be produced. This problem has been exacer-bated by the recent slide in oil prices.
The method of the present invention provides reduction in costs by eliminating the need for a separate drilling platform. Further, this method takes advantage of the lower costs associated with floating platforms and enables early initial production from a first well template ~k .
~.
- ~
, `: . '' "'' ~ :.' , .
while additional drllling is performed on a second or subse-quent template. In addition, the same floating platform is used for workovers to reduce maintenance costs without interrupting production from wells of other templates.
Finally, the floating platform can be deballasted for mainte-nance without curtailing production.
While the use of flexible risers to interconnect subsea wells to floating production platforms is becoming conventional, the present invention incorporates the "benefit" of the mobility of the platform resulting from mooring in deep water (normally considered a drawback), to enable the platform to perform the additional drilling and workover functions. When moored in water on the order of from 1000 to 3000 feet (305 to 915 meters) deep, there is sufficient flexibility in the moorings to permit the position of the floating platform to be adjusted to lie directly above any of several well templates positioned on the ocean floor for drilling or workover. Templates may be spaced apart by 300 feet (91.5m) without causing the riser to deviate from vertical by more than 17 (in 1000 ft water depth, 6 in 3000 ft), an angle easily accomo-dated by flexible risers. By configuring the flexible risers in a reverse loop, even these relatively small angles will be substantially reduced. This combined flexibility ~5 in moorings and production riser capability also permits the floating platform to be deballasted to permit certain portions that normally occupy subsurface positions to extend above the surface for inspection and maintenance, without curtailing production.
3a Various other characteristics, features and advan-tages of the present invention will become apparent after a reading of the following description.
Brief Description of the Drawings The Figure is a schematic side elevational view of a floating production platform utilizing the method of the present invention, the drilling/workover position . . ' ... . . . .
3~
being shown in solid line, the normal production position being shown in phantom.
Detailed Description of the Preferred Embodiment(s) The method of the present invention is adaptable for usage with any floating production facility. It is preferred that a semisubmersible platform 12 be utilized in this method. A plurality of mooring lines 14 (typically eight or more, only two have been shown to simplify the drawing) secure platform 12 in position above templates 16 and 18 by virtue of attachments 20 to the ocean floor.
Flexible production riser(s) 26 interconnect template 16 to platform 12. A rigid production riser section 28 traverses the zone (typically 20 to 30 feet) that is sub~ected to wave battering to extend riser life. The flexible riser 26 is depicted in the Figure in a reverse loop configuration that enhances the flexibility of the system. The use of a flexible riser obviates the need for motion compensation devices typically required with rigid risers and a floating production platform. The reverse loop configuration increases the amount of both lateral and vertical movement of which the platform is capable.
The utilization of the flexibility afforded in the moorings in 1000 to 3000 feet water depths (normally considered a problem to be overcome), with the flexible risers affords a platform that can be utilized simultaneously as a produc-tion facility and a drilling/workover rig. The flexible riser 26 may be a single conduit carrying the consolidated flow from a manifold located in proximity to the template 16 if subsea wellheads are used; or the flexible riser may be a bundle of conduits carrying production from the individual wells to wellheads located on the platform 12.
Platform 12 is ghosted into its normal position generally centered above its well templates 16 and 18.
By adjusting the mooring lines 14, that is, tightening some while slackening others, the position of the platform may be adjusted to bring it directly above one of the well , .
:
'` :
, templates 18 as shown in the Figure. This enables drilling or workover equipment to be lowered into a well bore through a vertically positioned casing 22 from derrick 24. This mooring adjustment might be accomplished, for e~ample, by coiling and uncoiling the mooring lines to and from winding drums (not shown).
While it is preferred that simultaneous production and drilling/workover not be accomplished on a single tem-plate (for safety reasons), there is no reason a platform could not be used to drill/workover one template while simultaneously producing from another, particularly if production is to a location outboard of the drilling derrick axis. sy adjusting the moorings and continuing production from other templates as described, several economic benefits are obtained: a) only a portion of production need be curtailed during workover and, b) a separate workover unit (with the aforementioned cost of $100,000 per day) is not needed.
The flotation columns of platform 12 can be debal-lasted in calm weather to enable portions of the platform normally occupying subsurface positions to be raised above the level of the water for inspection and maintenance, as necessary. The flexibility of the mooring system and production risers enables this maintenance to occur without disengaging the risers or curtailing production. Further, should it be necessary to deballast from the operational to the survival mode for a hundred year storm or the like, no adjustment or disconnection of the production risers is necessary to accomodate the change of platform position.
Although in describing the method of the present invention, lateral displacement of the platform in only one plane has been discussed, it will of course be understood that displacement in the second plane (into and out of the plane of the Figure) is also possible. Accordingly, the present method can accomodate four (or more) separate well templates with associated satellite wells. If four .. .
', ' , ~ .
. ~ .
templates are used, it is preferred that they be generally positioned at the corners of a square. Such a combination drilling/workover and production platform could accomodate on the order of 32 wells with a combined production of about 80,000 barrels of oil per day.
Various changes, modifications and alternatives will become apparent to one of ordinary skill in the art following a readlng of the foregoing specification. It is intended that all such changes, modifications and alter-natives as come within the scope of the appended claims be considered part of this invention.
Claims (8)
1. A method of using a platform in water on the order of from 1000 to 3000 feet deep, said method comprising.
mooring said platform using a plurality of mooring lines to connect said platform to the ocean floor in a position that is generally centered above a plurality of well templates, at least some of said templates lying along each of a first and a second lateral boundary of movement for said platform;
adjusting at least one of the mooring lines of said platform so as to position said platform directly above a first one of said templates lying along said first lateral boundary without disconnecting said mooring lines;
drilling at least one well through said first template;
completing each of said at least one well;
interconnecting said at least one completed well to said platform using at least one riser;
adjusting the mooring of said platform so as to position said platform directly above a second one of said templates lying along said second lateral boundary without disconnecting said mooring lines, a portion of at least one said mooring lines defining an angle of less than 90° with respect to the ocean floor throughout movement of said platform between its lateral boundaries;
drilling at least one well in said second template.
mooring said platform using a plurality of mooring lines to connect said platform to the ocean floor in a position that is generally centered above a plurality of well templates, at least some of said templates lying along each of a first and a second lateral boundary of movement for said platform;
adjusting at least one of the mooring lines of said platform so as to position said platform directly above a first one of said templates lying along said first lateral boundary without disconnecting said mooring lines;
drilling at least one well through said first template;
completing each of said at least one well;
interconnecting said at least one completed well to said platform using at least one riser;
adjusting the mooring of said platform so as to position said platform directly above a second one of said templates lying along said second lateral boundary without disconnecting said mooring lines, a portion of at least one said mooring lines defining an angle of less than 90° with respect to the ocean floor throughout movement of said platform between its lateral boundaries;
drilling at least one well in said second template.
2. The method of Claim 1 wherein said at least one flexible riser is extended from said first template lying along said first boundary to run along the ocean floor beyond said second lateral boundary before it is bent back toward said first template in a reverse loop configuration and is attached to said platform;
3. The method of Claim 1 further comprising the steps of deballasting the floating platform during periods of calm weather to permit certain portions of the platform normally occupying subsurface positions to extend above the surface for inspection and maintenance, as required, without interrupting production.
4. The method of Claim 1 wherein the step of interconnecting said completed wells to said platform further comprises using at least one rigid riser of sufficient length to traverse a zone impacted by waves to interconnect said platform and said at least one flexible riser.
5. The method of Claim 1 further comprising the step of interconnecting the at least one completed well from the second template to the floating platform using at least one looped flexible riser.
6. The method of Claim 5 wherein said at least one flexible riser is extended from said second template lying along said second lateral boundary to run along the ocean floor beyond said first lateral boundary before it is sent back toward said second template in a reverse loop configuration and is attached to said platform.
7. The method of Claim 5 wherein the step of interconnecting said at least one completed well to said platform further comprises using at least one rigid riser of sufficient length to traverse a zone impacted by waves to interconnect said floating platform and said at least one flexible riser of the at least one completed well of said second template.
8. A method of using a floating platform in water on the order of 1,000 to 3,000 feet deep, said method comprising:
mooring said platform using a plurality of mooring lines to connect said platform to the ocean floor in a position that is generally centered above a plurality of well templates, at least some of said templates lying along each of a first and a second lateral boundary of movement for said platform;
adjusting at least one of the mooring lines of said platform so as to position said platform directly above a first set of said templates lying along said first lateral boundary without disconnecting said mooring lines;
drilling at least one well through said first template;
completing each of said at least one well;
interconnecting said at least one completed well to said platform using at least one riser;
adjusting the mooring of said platform so as to position said platform directly above a second one of said templates lying along said second lateral boundary without disconnecting said mooring lines, a portion of at least one of said mooring lines defining an angle of less than 90°
with respect to the ocean floor throughout movement of said platform between its lateral boundaries;
drilling at least one well in said second template.
mooring said platform using a plurality of mooring lines to connect said platform to the ocean floor in a position that is generally centered above a plurality of well templates, at least some of said templates lying along each of a first and a second lateral boundary of movement for said platform;
adjusting at least one of the mooring lines of said platform so as to position said platform directly above a first set of said templates lying along said first lateral boundary without disconnecting said mooring lines;
drilling at least one well through said first template;
completing each of said at least one well;
interconnecting said at least one completed well to said platform using at least one riser;
adjusting the mooring of said platform so as to position said platform directly above a second one of said templates lying along said second lateral boundary without disconnecting said mooring lines, a portion of at least one of said mooring lines defining an angle of less than 90°
with respect to the ocean floor throughout movement of said platform between its lateral boundaries;
drilling at least one well in said second template.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US87657686A | 1986-06-20 | 1986-06-20 | |
| US876,576 | 1986-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1294495C true CA1294495C (en) | 1992-01-21 |
Family
ID=25368056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000537593A Expired - Lifetime CA1294495C (en) | 1986-06-20 | 1987-05-21 | Deepwater floating drilling and production facility incorporating flexible production risers |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0250069B1 (en) |
| JP (1) | JPS634193A (en) |
| CA (1) | CA1294495C (en) |
| DE (1) | DE3786374D1 (en) |
| DK (1) | DK312487A (en) |
| NO (1) | NO872588L (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4819730A (en) * | 1987-07-24 | 1989-04-11 | Schlumberger Technology Corporation | Development drilling system |
| NO307210B1 (en) * | 1996-11-27 | 2000-02-28 | Norske Stats Oljeselskap | Oil or gas extraction system |
| NO313794B1 (en) * | 1997-01-07 | 2002-12-02 | Lund Mohr & Gi Ver Enger Marin | Device for drilling and production vessels |
| GB0124610D0 (en) * | 2001-10-12 | 2001-12-05 | Alpha Thames Ltd | Early hydrocarbon extraction system |
| EP2704945B1 (en) * | 2011-05-06 | 2017-10-25 | National Oilwell Varco Denmark I/S | An offshore system |
| CN109072877B (en) * | 2015-11-30 | 2022-03-29 | 奈普顿科技有限责任公司 | Renewable energy barge |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3327780A (en) * | 1965-03-15 | 1967-06-27 | Exxon Production Research Co | Connection of underwater wells |
| EP0063911A3 (en) * | 1981-04-29 | 1983-09-21 | Taylor Woodrow Construction Limited | Flow line for use in the transfer of fluid to or from under water sites |
| GB2182083B (en) * | 1985-10-24 | 1988-12-14 | Shell Int Research | Method of conducting well operations from an offshore platform |
-
1987
- 1987-04-07 DE DE8787303005T patent/DE3786374D1/en not_active Expired - Lifetime
- 1987-04-07 EP EP87303005A patent/EP0250069B1/en not_active Expired - Lifetime
- 1987-04-08 JP JP62084904A patent/JPS634193A/en active Pending
- 1987-05-21 CA CA000537593A patent/CA1294495C/en not_active Expired - Lifetime
- 1987-06-19 DK DK312487A patent/DK312487A/en unknown
- 1987-06-19 NO NO872588A patent/NO872588L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPS634193A (en) | 1988-01-09 |
| EP0250069A3 (en) | 1989-03-29 |
| NO872588L (en) | 1987-12-21 |
| NO872588D0 (en) | 1987-06-19 |
| DE3786374D1 (en) | 1993-08-05 |
| DK312487A (en) | 1987-12-21 |
| DK312487D0 (en) | 1987-06-19 |
| EP0250069B1 (en) | 1993-06-30 |
| EP0250069A2 (en) | 1987-12-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4762180A (en) | Modular near-surface completion system | |
| US5439321A (en) | Interruptive mobile production system | |
| US7086809B2 (en) | Minimum floating offshore platform with water entrapment plate and method of installation | |
| US4913238A (en) | Floating/tensioned production system with caisson | |
| EP1277913B1 (en) | Drillship or semi-submersible and multi-activity drilling assembly | |
| AU575205B2 (en) | Vessel mooring system and method for its installation | |
| US5195848A (en) | Method and system for developing offshore hydrocarbon reserves | |
| US4545437A (en) | Drilling riser locking apparatus and method | |
| WO1987001748A1 (en) | A drilling, production and oil storage caisson for deep water | |
| CA2437939A1 (en) | Hybrid tension-leg riser | |
| AU2006202208A9 (en) | Subsea well communications apparatus and method using variable tension large offset risers | |
| CA2439963C (en) | Offshore floating production method | |
| AU2002307189A1 (en) | Offshore floating production method | |
| US4470721A (en) | Crane assembly for floatable oil/gas production platforms | |
| CA1294495C (en) | Deepwater floating drilling and production facility incorporating flexible production risers | |
| GB2486520A (en) | Storing a riser underwater | |
| EP0063911A2 (en) | Flow line for use in the transfer of fluid to or from under water sites | |
| GB2041836A (en) | Drilling Vessels | |
| WO1999032352A1 (en) | Floating production installation | |
| GB2180809A (en) | Tethered buoyant system | |
| EP0039597B1 (en) | Drilling a borehole from an offshore platform | |
| WO1998058152A1 (en) | Method and apparatus for drilling subsea wells | |
| EP0039596B1 (en) | Offshore drilling and production system | |
| IE48134B1 (en) | Vertically moored platform anchoring | |
| CA1135517A (en) | Vertically moored platform anchoring |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |