US20140374117A1 - Methods and Means for Installing, Maintaining and Controlling a Self-Standing Riser System - Google Patents
Methods and Means for Installing, Maintaining and Controlling a Self-Standing Riser System Download PDFInfo
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- US20140374117A1 US20140374117A1 US14/478,680 US201414478680A US2014374117A1 US 20140374117 A1 US20140374117 A1 US 20140374117A1 US 201414478680 A US201414478680 A US 201414478680A US 2014374117 A1 US2014374117 A1 US 2014374117A1
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- Prior art keywords
- riser
- wellhead
- chamber
- flow
- buoyancy chamber
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000012530 fluid Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 13
- 238000009434 installation Methods 0.000 description 7
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 238000005553 drilling Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
- E21B17/012—Risers with buoyancy elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/18—Pipes provided with plural fluid passages
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
- E21B33/038—Connectors used on well heads, e.g. for connecting blow-out preventer and riser
Definitions
- the present invention relates generally to oil and gas exploration and production systems, and in a plurality of specific though non-limiting embodiments, to various methods and means for installing, maintaining and controlling a self-standing riser system.
- SSR self-standing riser
- Such risers are self-supporting, and provide all of the risers, casing, buoyancy chambers, etc., necessary for exploration and production and of oil, gas and other hydrocarbons. SSRs also provide the safety features required to ensure that the produced hydrocarbons do not escape from the system out into surrounding waters.
- a method of installing a riser of a self-standing riser system including: placing the riser above a wellhead; and attaching the riser to the wellhead; wherein the riser is placed above the wellhead using at least one of a weight attached to the riser and at least one pulley wheel attached to the wellhead.
- Two pulley wheels may be attached to the wellhead.
- Two wires may be attached to the riser and passed through the two pulley wheels such that the riser is pulled down by the two wires.
- the method may include pulling upward on leading ends of the two wires such that the riser is pulled downward via trailing ends of the two wires.
- the weight may be attached to a top portion of the riser.
- the weight may be a drill collar.
- the weight may be attached to a bottom portion of the riser.
- the weight may be a piece of steel configured to rest upon the wellhead.
- a flow diverter including: a flow diversion path having a first end connected to a riser of a self-standing riser; and a fluid line connected to a second end of the flow diversion path.
- the flow diversion path is configured to divert fluid flow into and out of the riser.
- the flow diversion path may be incorporated into a buoyancy chamber.
- the flow diversion path may be incorporated into a flow diverter device.
- the flow diverter device may be configured to connect to the riser at a point below a buoyancy chamber.
- a buoyancy chamber assembly for a self-standing riser including: a non-annular chamber having: an outer circumference; an inner circumference forming an opening; and a slot; a hang off ring having: an outer circumference; and a riser space.
- a diameter formed by the outer circumference of the hang off ring is greater than a diameter of the opening formed by the inner circumference of the chamber.
- the hang off ring is configured to attach to a riser.
- the hang off ring is further configured to rest upon a top portion of the chamber.
- the chamber may have a non-adjustable buoyancy.
- a width of the slot may be greater than the diameter of a riser installed in the buoyancy chamber assembly.
- the hang off ring may be configured to hold the riser to the chamber.
- FIG. 1 is side view representation of a riser being installed on a wellhead, according to an exemplary embodiment of the present invention.
- FIG. 2 is side view representation of a riser installed on a wellhead having a weight on an upper portion of the riser, according to an exemplary embodiment of the present invention.
- FIG. 3 is side view representation of a riser installed on a wellhead having a weight on a lower portion of the riser, according to an exemplary embodiment of the present invention.
- FIG. 4 is a side view representation of a flow diverter connected to a riser and a production line, according to an exemplary embodiment of the present invention.
- FIG. 5 is a side view representation of a buoyancy chamber having a flow diverter, according to an exemplary embodiment of the present invention.
- FIG. 6 is a top view of a buoyancy chamber, according to an exemplary embodiment of the present invention.
- FIG. 7 is a top view of a buoyancy chamber and a hang off ring, according to an exemplary embodiment of the present invention.
- FIG. 8 is a side view of a buoyancy chamber and riser, according to an exemplary embodiment of the present invention.
- FIG. 9 is a side view of a riser having a hang off ring, according to an exemplary embodiment of the present invention.
- Embodiments of the present invention provide improved methods and systems for installation, maintenance and control of SSRs.
- improved systems and methods for installation of an SSR upon a wellhead incorporate pulleys to pull an SSR into place over a wellhead.
- Embodiments of the present invention may include two or more sheeves attached to a wellhead and configured such that wires attached to a connector of a riser may be passed over said sheeves as the connector is pulled down over the wellhead.
- Embodiments of the present invention may include one or more surface wenches connected to the wires.
- Alternate embodiments of the present invention may include a weight connected to a either a top portion of an SSR system or a bottom riser of said system.
- the weights may be used to lower the SSR into place and the weights may be removable after installation.
- Embodiments of the present invention may include a flow diverter device which may be part of a buoyancy chamber or may be separate from the buoyancy chamber. In example embodiments, the flow diverter device may be configured to divert flow both into and out of an SSR.
- Embodiments of the present invention include a non-annular buoyancy chamber which may be used with rigid and/or flexible risers.
- Embodiments of the non-annular buoyancy chamber may have a slot on a side of the chamber configured to allow a riser to be slipped into an inner circumference of the chamber.
- Embodiments may include a hang off ring which may be attached to a top portion of a riser and may be configured to rest upon the chamber when the riser is placed within the chamber.
- the buoyancy chamber may have little or no buoyancy adjustability.
- FIG. 1 there is provided a system and method of installing a riser 20 over a wellhead 10 at sea floor 30 via wires 120 .
- a pair of pulley wheels 130 which may be sheeves, are attached to a base of wellhead 10 .
- Riser 20 has a connector 100 which is connected to wires 120 via connector rings 110 , which may be any type of attachments suitable for connecting wire 120 to connector 100 .
- Riser 20 is installed over wellhead 10 by pulling upward on leading end 140 of wire 120 such that wire 120 is pulled over the pulley wheels 130 and trailing end 150 of wire 120 diminishes.
- Leading end 140 may be pulled upward via one or more surface wenches.
- the SSR may have a pre-set buoyancy allowing the risers to be under proper tension as the SSR is pulled down over the wellhead. Once pulled sufficiently down over the wellhead, the SSR may be attached to the wellhead.
- weight 200 is used to lower riser 20 of the SSR over wellhead 10 .
- Weight 200 may by attached to a top portion of riser 20 such that it pushes riser 20 downward. See, e.g., FIG. 2 .
- Weight 200 may be a drill collar which may be removed after riser 20 is installed.
- Riser 20 may have slightly positive buoyancy distributed across riser 20 providing tension along the length of riser 20 .
- weight 200 may be attached to a bottom of riser 20 , pulling 20 downward. See, e.g., FIG. 3 .
- Weight 200 may be a piece of steel and may be configured to land upon wellhead 10 . When in contact with wellhead 10 , weight 200 will have a neutral effect on the riser 20 .
- Slightly positive buoyancy may be distributed across riser 20 which may provide tension along the length of riser 20 .
- a flow diverter device 320 which may be used to divert flow both into and out of riser 20 . See, e.g., FIG. 4 .
- Flow diverter device 320 may be below buoyancy chamber 50 .
- flow diversion path 330 may be incorporated into buoyancy chamber 50 . See, e.g., FIG. 5 .
- production flow from wellhead 10 and production tree 40 may pass upwards through riser 20 and into flow diversion path 330 of flow diverter device 320 .
- Flow may be directed from the flow diversion path 330 to a production vessel via production/injection line 310 .
- Buoyancy chamber 50 may have annular space 300 .
- Flow diversion path 330 may be used for hydrocarbon production, fluid injections, or any combination of the two.
- Flow diversion path 330 may be located in flow diverter device 320 or integral to buoyancy chamber 50 .
- buoyancy chamber 400 having slot 430 configured to receive a riser. See, e.g., FIGS. 6 to 8 .
- Buoyancy chamber 400 may be non-annular. Except for slot 430 , buoyancy chamber 400 has an outer circumference 410 and an inner circumference 420 . A diameter formed by inner circumference 420 may be configured to be larger than a diameter of a riser to be installed therein. Buoyancy chamber 400 may be non-adjustable and may be configured to rest at the water surface 60 when riser 480 is installed therein. See, e.g., FIG. 8 .
- Embodiments may include hang off ring 440 having an outer circumference 450 and an inner circumference 460 , which forms riser space 470 .
- a diameter formed by outer circumference 450 is substantially larger than the diameter formed by inner circumference 420 such that hang off ring 440 rests upon buoyancy chamber 400 when installed thereon.
- Hang off ring 440 may be attached to an upper portion of riser 480 . See, e.g., FIG. 9 . When installed, hang off ring 440 rests upon buoyancy chamber 400 holding riser 480 in place.
- Riser 480 may be installed into buoyancy chamber 400 by sliding riser 480 into slot 430 .
- riser 480 may be installed into buoyancy chamber 400 by passing riser 480 through inner circumference 420 .
- Riser 480 may be under tension when installed and may be lowered until hang off ring 440 rests upon buoyancy chamber 400 .
- Riser 480 may be rigid or flexible.
- a surface vessel may be used to tension riser 480 and then lower it down inside buoyancy chamber 400 , releasing the weight of riser 480 to the buoyancy chamber 400 .
- Embodiments of the present invention include installation methods, flow diversion apparatuses and non-annular buoyancy chambers which may be used in combination for efficient installation, maintenance and control of a SSR.
Abstract
Improved systems and methods for installing, maintaining and controlling a self-standing riser (SSR). SSRs are installed using wire pulleys or weights to place the SSRs over a wellhead. A flow diverter, which may be incorporated into or separate from a buoyancy chamber, allowing diversion of flow both into and out of an SSR. Non-annular buoyancy chambers configured to receive a riser of an SSR through a slot of the buoyancy chamber.
Description
- The present invention relates generally to oil and gas exploration and production systems, and in a plurality of specific though non-limiting embodiments, to various methods and means for installing, maintaining and controlling a self-standing riser system.
- In recent years, there has been an increasing worldwide demand for oil and gas. Despite exploration and development, oil and gas supply continues to fall short of demand. In an effort to balance supply and demand, companies and governmental entities have begun to explore and develop relatively marginal fields in the deeper offshore waters (e.g., Gulf of Mexico, West Africa and Brazil). Notwithstanding these efforts, due to high construction costs and limited manufacturing facilities, only a small number of mobile offshore drilling units (MODUs) are being manufactured each year, thereby resulting in escalating “per day” unit costs and a shortage of associated offshore drilling, completion and work-over equipment.
- As an alternative to MODU production, self-standing riser (SSR) systems may be safely and reliably installed in communication with a well head or production tree. Such risers are self-supporting, and provide all of the risers, casing, buoyancy chambers, etc., necessary for exploration and production and of oil, gas and other hydrocarbons. SSRs also provide the safety features required to ensure that the produced hydrocarbons do not escape from the system out into surrounding waters.
- Although SSR systems provide substantial advantages for the production of hydrocarbons, known SSR systems are still difficult to install, maintain, and control, requiring either a number of different surface vessels or a MODU. Often, expensive hull and deck modifications have to be made for installations. Few improvements in associated per-day costs have been realized over non-SSR production.
- Accordingly, there is need for more cost-effective means, systems and methods of installing, maintaining and controlling SSR systems.
- In an example embodiment of the present disclosure, a method of installing a riser of a self-standing riser system is provided, including: placing the riser above a wellhead; and attaching the riser to the wellhead; wherein the riser is placed above the wellhead using at least one of a weight attached to the riser and at least one pulley wheel attached to the wellhead. Two pulley wheels may be attached to the wellhead. Two wires may be attached to the riser and passed through the two pulley wheels such that the riser is pulled down by the two wires. The method may include pulling upward on leading ends of the two wires such that the riser is pulled downward via trailing ends of the two wires. The weight may be attached to a top portion of the riser. The weight may be a drill collar. The weight may be attached to a bottom portion of the riser. The weight may be a piece of steel configured to rest upon the wellhead.
- In an example embodiment of the present disclosure, a flow diverter is provided, including: a flow diversion path having a first end connected to a riser of a self-standing riser; and a fluid line connected to a second end of the flow diversion path. The flow diversion path is configured to divert fluid flow into and out of the riser. The flow diversion path may be incorporated into a buoyancy chamber. The flow diversion path may be incorporated into a flow diverter device. The flow diverter device may be configured to connect to the riser at a point below a buoyancy chamber.
- In an example embodiment of the present disclosure, a buoyancy chamber assembly for a self-standing riser is provided, including: a non-annular chamber having: an outer circumference; an inner circumference forming an opening; and a slot; a hang off ring having: an outer circumference; and a riser space. A diameter formed by the outer circumference of the hang off ring is greater than a diameter of the opening formed by the inner circumference of the chamber. The hang off ring is configured to attach to a riser. The hang off ring is further configured to rest upon a top portion of the chamber. The chamber may have a non-adjustable buoyancy. A width of the slot may be greater than the diameter of a riser installed in the buoyancy chamber assembly. The hang off ring may be configured to hold the riser to the chamber.
-
FIG. 1 is side view representation of a riser being installed on a wellhead, according to an exemplary embodiment of the present invention. -
FIG. 2 is side view representation of a riser installed on a wellhead having a weight on an upper portion of the riser, according to an exemplary embodiment of the present invention. -
FIG. 3 is side view representation of a riser installed on a wellhead having a weight on a lower portion of the riser, according to an exemplary embodiment of the present invention. -
FIG. 4 is a side view representation of a flow diverter connected to a riser and a production line, according to an exemplary embodiment of the present invention. -
FIG. 5 is a side view representation of a buoyancy chamber having a flow diverter, according to an exemplary embodiment of the present invention. -
FIG. 6 is a top view of a buoyancy chamber, according to an exemplary embodiment of the present invention. -
FIG. 7 is a top view of a buoyancy chamber and a hang off ring, according to an exemplary embodiment of the present invention. -
FIG. 8 is a side view of a buoyancy chamber and riser, according to an exemplary embodiment of the present invention. -
FIG. 9 is a side view of a riser having a hang off ring, according to an exemplary embodiment of the present invention. - Embodiments of the present invention provide improved methods and systems for installation, maintenance and control of SSRs. In example embodiments of the present invention there is provided improved systems and methods for installation of an SSR upon a wellhead. Embodiments of the present invention incorporate pulleys to pull an SSR into place over a wellhead. Embodiments of the present invention may include two or more sheeves attached to a wellhead and configured such that wires attached to a connector of a riser may be passed over said sheeves as the connector is pulled down over the wellhead. Embodiments of the present invention may include one or more surface wenches connected to the wires. Alternate embodiments of the present invention may include a weight connected to a either a top portion of an SSR system or a bottom riser of said system. The weights may be used to lower the SSR into place and the weights may be removable after installation. Embodiments of the present invention may include a flow diverter device which may be part of a buoyancy chamber or may be separate from the buoyancy chamber. In example embodiments, the flow diverter device may be configured to divert flow both into and out of an SSR. Embodiments of the present invention include a non-annular buoyancy chamber which may be used with rigid and/or flexible risers. Embodiments of the non-annular buoyancy chamber may have a slot on a side of the chamber configured to allow a riser to be slipped into an inner circumference of the chamber. Embodiments may include a hang off ring which may be attached to a top portion of a riser and may be configured to rest upon the chamber when the riser is placed within the chamber. In example embodiments, the buoyancy chamber may have little or no buoyancy adjustability.
- Referring to the exemplary embodiment of the present invention shown in
FIG. 1 , there is provided a system and method of installing ariser 20 over awellhead 10 atsea floor 30 viawires 120. As shown, a pair ofpulley wheels 130, which may be sheeves, are attached to a base ofwellhead 10. Riser 20 has aconnector 100 which is connected towires 120 viaconnector rings 110, which may be any type of attachments suitable for connectingwire 120 toconnector 100. Riser 20 is installed overwellhead 10 by pulling upward on leadingend 140 ofwire 120 such thatwire 120 is pulled over thepulley wheels 130 and trailingend 150 ofwire 120 diminishes. Leadingend 140 may be pulled upward via one or more surface wenches. Although shown with twowires 120 and twopulley wheels 130, more orless pulley wheels 130 may be attached towellhead 10 and installation may use all of thepulley wheels 130 or less than all of thepulley wheels 130. The SSR may have a pre-set buoyancy allowing the risers to be under proper tension as the SSR is pulled down over the wellhead. Once pulled sufficiently down over the wellhead, the SSR may be attached to the wellhead. - In
FIGS. 2 and 3 , alternative embodiments of the present invention are shown whereinweight 200 is used tolower riser 20 of the SSR overwellhead 10.Weight 200 may by attached to a top portion ofriser 20 such that it pushesriser 20 downward. See, e.g.,FIG. 2 .Weight 200 may be a drill collar which may be removed afterriser 20 is installed.Riser 20 may have slightly positive buoyancy distributed acrossriser 20 providing tension along the length ofriser 20. Alternatively,weight 200 may be attached to a bottom ofriser 20, pulling 20 downward. See, e.g.,FIG. 3 .Weight 200 may be a piece of steel and may be configured to land uponwellhead 10. When in contact withwellhead 10,weight 200 will have a neutral effect on theriser 20. Slightly positive buoyancy may be distributed acrossriser 20 which may provide tension along the length ofriser 20. - In example embodiments of the present invention there is provided a
flow diverter device 320 which may be used to divert flow both into and out ofriser 20. See, e.g.,FIG. 4 .Flow diverter device 320 may be belowbuoyancy chamber 50. Alternatively, flowdiversion path 330 may be incorporated intobuoyancy chamber 50. See, e.g.,FIG. 5 . As shown inFIG. 4 , production flow fromwellhead 10 andproduction tree 40 may pass upwards throughriser 20 and intoflow diversion path 330 offlow diverter device 320. Flow may be directed from theflow diversion path 330 to a production vessel via production/injection line 310. -
Buoyancy chamber 50 may haveannular space 300.Flow diversion path 330 may be used for hydrocarbon production, fluid injections, or any combination of the two.Flow diversion path 330 may be located inflow diverter device 320 or integral tobuoyancy chamber 50. - In further embodiments of the present invention there is provided
buoyancy chamber 400 havingslot 430 configured to receive a riser. See, e.g.,FIGS. 6 to 8 .Buoyancy chamber 400 may be non-annular. Except forslot 430,buoyancy chamber 400 has anouter circumference 410 and aninner circumference 420. A diameter formed byinner circumference 420 may be configured to be larger than a diameter of a riser to be installed therein.Buoyancy chamber 400 may be non-adjustable and may be configured to rest at thewater surface 60 whenriser 480 is installed therein. See, e.g.,FIG. 8 . Embodiments may include hang offring 440 having anouter circumference 450 and aninner circumference 460, which formsriser space 470. A diameter formed byouter circumference 450 is substantially larger than the diameter formed byinner circumference 420 such that hang offring 440 rests uponbuoyancy chamber 400 when installed thereon. Hang offring 440 may be attached to an upper portion ofriser 480. See, e.g.,FIG. 9 . When installed, hang offring 440 rests uponbuoyancy chamber 400 holdingriser 480 in place.Riser 480 may be installed intobuoyancy chamber 400 by slidingriser 480 intoslot 430. Alternatively,riser 480 may be installed intobuoyancy chamber 400 by passingriser 480 throughinner circumference 420.Riser 480 may be under tension when installed and may be lowered until hang offring 440 rests uponbuoyancy chamber 400.Riser 480 may be rigid or flexible. A surface vessel may be used totension riser 480 and then lower it down insidebuoyancy chamber 400, releasing the weight ofriser 480 to thebuoyancy chamber 400. - Embodiments of the present invention include installation methods, flow diversion apparatuses and non-annular buoyancy chambers which may be used in combination for efficient installation, maintenance and control of a SSR.
- While the embodiments are described with reference to various implementations and exploitations, it will be understood that these embodiments are illustrative and that the scope of the inventions is not limited to them. Many variations, modifications, additions, and improvements are possible. Further still, any steps described herein may be carried out in any desired order, and any desired steps may be added or deleted.
Claims (16)
1. A method of installing a riser of a self-standing riser system, comprising:
placing the riser above a wellhead; and
attaching the riser to the wellhead;
wherein the riser is placed above the wellhead using at least one of a weight attached to the riser and at least one pulley wheel attached to the wellhead.
2. The method of claim 1 , wherein two pulley wheels are attached to the wellhead.
3. The method of claim 2 , further comprising two wires attached to the riser and passed through the two pulley wheels such that the riser is pulled down by the two wires.
4. The method of claim 3 , further comprising: pulling upward on leading ends of the two wires such that the riser is pulled downward via trailing ends of the two wires.
5. The method of claim 1 , wherein the weight is attached to a top portion of the riser.
6. The method of claim 5 , wherein the weight is a drill collar.
7. The method of claim 1 , wherein the weight is attached to a bottom portion of the riser.
8. The method of claim 7 , wherein the weight is a piece of steel configured to rest upon the wellhead.
9. A flow diverter, comprising:
a flow diversion path having a first end connected to a riser of a self-standing riser; and
a fluid line connected to a second end of the flow diversion path;
wherein the flow diversion path is configured to divert fluid flow into and out of the riser.
10. A flow diverter of claim 9 , wherein the flow diversion path is incorporated into a buoyancy chamber.
11. A flow diverter of claim 9 , wherein the flow diversion path is incorporated into a flow diverter device.
12. A flow diverter of claim 11 , wherein the flow diverter device is configured to connect to the riser at a point below a buoyancy chamber.
13. A buoyancy chamber assembly for a self-standing riser, comprising:
a non-annular chamber having:
an outer circumference;
an inner circumference forming an opening; and
a slot;
a hang off ring having:
an outer circumference; and
a riser space;
wherein a diameter formed by the outer circumference of the hang off ring is greater than a diameter of the opening formed by the inner circumference of the chamber;
wherein the hang off ring is configured to attach to a riser; and
wherein the hang off ring is further configured to rest upon a top portion of the chamber.
14. The buoyancy chamber assembly of claim 13 , wherein the chamber has a non-adjustable buoyancy.
15. The buoyancy chamber assembly of claim 13 , wherein a width of the slot is greater than the diameter of a riser installed in the buoyancy chamber assembly.
16. The buoyancy chamber assembly of 13, wherein the hang off ring is configured to hold the riser to the chamber.
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US14/478,680 US20140374117A1 (en) | 2012-05-17 | 2014-09-05 | Methods and Means for Installing, Maintaining and Controlling a Self-Standing Riser System |
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US201313896654A | 2013-05-17 | 2013-05-17 | |
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US14/478,680 US20140374117A1 (en) | 2012-05-17 | 2014-09-05 | Methods and Means for Installing, Maintaining and Controlling a Self-Standing Riser System |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2016137718A1 (en) * | 2015-02-26 | 2016-09-01 | Exxonmobil Upstream Research Company | Drilling riser with distributed buoyancy |
US9739101B1 (en) * | 2016-07-13 | 2017-08-22 | Ensco International Incorporated | Riser deflection mitigation |
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WO2016137718A1 (en) * | 2015-02-26 | 2016-09-01 | Exxonmobil Upstream Research Company | Drilling riser with distributed buoyancy |
US9670740B2 (en) | 2015-02-26 | 2017-06-06 | Exxonmobil Upstream Research Company | Drilling riser with distributed buoyancy |
US9739101B1 (en) * | 2016-07-13 | 2017-08-22 | Ensco International Incorporated | Riser deflection mitigation |
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