WO2009012349A1 - Subsea structure load monitoring and control system - Google Patents
Subsea structure load monitoring and control system Download PDFInfo
- Publication number
- WO2009012349A1 WO2009012349A1 PCT/US2008/070249 US2008070249W WO2009012349A1 WO 2009012349 A1 WO2009012349 A1 WO 2009012349A1 US 2008070249 W US2008070249 W US 2008070249W WO 2009012349 A1 WO2009012349 A1 WO 2009012349A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- load
- induced
- subsea structure
- sensor
- loads
- Prior art date
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000005452 bending Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/002—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling
-
- 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
- E21B41/04—Manipulators for underwater operations, e.g. temporarily connected to well heads
-
- 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
- E21B43/013—Connecting a production flow line to an underwater well head
Definitions
- Loop currents impart loads and deflections onto subsea structures such as blowout preventors (BOPs) and risers such that the ability to connect and disconnect a BOP to and from a wellhead is hampered.
- the current may deflect the hanging riser and BOP system away from vertical to a degree that the BOP cannot be latched to the wellhead.
- Fig. 1 is an unsealed, side view of a remotely operated vehicle which has engaged a subsea structure to which a sensor array has been mounted
- Fig. 2 is an unsealed, side view of a remotely operated vehicle which has been deployed to engage a subsea structure to which a sensor array has been mounted where the subsea structure is veering off of its intended deployment path;
- Fig. 3 is an unsealed, side view of a remotely operated vehicle which has engaged a subsea structure to which a sensor array has been mounted. DESCRIPTION OF EXEMPLARY EMBODIMENTS
- the subsea structure load monitoring and control system described herein below allows the running of a subsea structure, e.g. a blowout preventer (BOP), in strong loop currents or other induced loads such as current-induced loads or loads induced by lateral displacement of a vessel away from a wellhead.
- a system for monitoring loads in such structures e.g. BOP connectors or risers, allows induced loads such as environmentally induced loads resulting from currents, vessel drift, and the like, or a combination thereof to be monitored and, once the loads are known, counteracted by inducing equal forces in the opposite direction.
- one or more sensors 20 is placed proximate a subsea structure, e.g. BOP connector 11, preferably radially.
- sensors 20 simply measure the loads that are due to internal, normally- seen connector forces.
- Sensors 20 are typically strain sensors such as foil strain gauges manufactured by Vishay Intertechnology, Inc. of Malvern, Pennsylvania or fiber optic strain gauges manufactured by Micron Optics Inc. of Atlanta, Georgia.
- Sensors 20 interface with and are read by appropriate sensor electronics 22.
- Sensor electronics 22 may be located on subsea structure 10, lower marine riser package 14 , a remotely operated vehicle (ROV) 12, a thruster package (not shown in the figures), or the like, or a combination thereof.
- load information obtained from sensors 20 is used to adjust the thrust output of ROV 12 or a thruster package so as to induce a load equal in force, but opposite in direction, to the induced loads such as current-induced loads.
- subsea structure connector 11 can release subsea structure connector 11 and raise subsea structure 10 off of the wellhead without fear of subsea structure 10 or its associated riser, if any, being swept into other equipment.
- subsea structure 10 may stay vertical during the release and raise operation.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
A system for monitoring for loads in a subsea structure comprises one or more sensors disposed proximate a subsea structure such as a blow-out preventer. The sensors are configured to detect an induced load on a subsea structure. The detected load is communicated to a sensor data processor operatively in communication with the strain sensor. Using the detected load data, a load generator such as a remotely operated vehicle or other source of thrust has its thrust output adjusted to induce a load equal in force, but opposite in direction, to the detected induced loads.
Description
SUBSEA STRUCTURE LOAD MONITORING AND CONTROL SYSTEM Inventors: Richard W. McCoy, Jr. RELATION TO PRIOR APPLICATIONS
[0001] The present application claims priority in part through U.S. Patent Application
No. 12/174,166 filed on July 16, 2008 and U.S. Provisional Application 60/950,184 filed July 17, 2007.
FIELD OF THE INVENTION
[0002] Loop currents impart loads and deflections onto subsea structures such as blowout preventors (BOPs) and risers such that the ability to connect and disconnect a BOP to and from a wellhead is hampered. The current may deflect the hanging riser and BOP system away from vertical to a degree that the BOP cannot be latched to the wellhead.
[0003] If the BOP is already latched when the current loads are induced, there is no way of knowing what effect those forces will have on the BOP and riser once the connector is unlatched and the BOP is lifted off the connector. If the forces are sufficient, then the current may sweep the BOP and the riser into other equipment installed on the seafloor. [0004] At the current time, drilling operations are halted in strong loop current conditions. FIGURES
[0005] The attached figures illustrate various aspects of exemplary embodiments of the
BOP Current Load Monitoring and Control System.
[0006] Fig. 1 is an unsealed, side view of a remotely operated vehicle which has engaged a subsea structure to which a sensor array has been mounted;
[0007] Fig. 2 is an unsealed, side view of a remotely operated vehicle which has been deployed to engage a subsea structure to which a sensor array has been mounted where the subsea structure is veering off of its intended deployment path; and
[0008] Fig. 3 is an unsealed, side view of a remotely operated vehicle which has engaged a subsea structure to which a sensor array has been mounted. DESCRIPTION OF EXEMPLARY EMBODIMENTS
[0009] In its various embodiments, the subsea structure load monitoring and control system described herein below allows the running of a subsea structure, e.g. a blowout preventer (BOP), in strong loop currents or other induced loads such as current-induced loads or loads induced by lateral displacement of a vessel away from a wellhead. In the following exemplary embodiments, a system for monitoring loads in such structures, e.g. BOP connectors or risers, allows induced loads such as environmentally induced loads resulting from currents, vessel drift, and the like, or a combination thereof to be monitored and, once the loads are known, counteracted by inducing equal forces in the opposite direction.
[0010] Referring now to Fig. 1, one or more sensors 20 is placed proximate a subsea structure, e.g. BOP connector 11, preferably radially. When subsea structure 10 is connected with no induced loads, sensors 20 simply measure the loads that are due to internal, normally- seen connector forces. However, once subsea structure 10 is subjected to a lateral load, sensors 20 will detect additional shear and bending loads superimposed upon the normal loads. Sensors 20 are typically strain sensors such as foil strain gauges manufactured by Vishay Intertechnology, Inc. of Malvern, Pennsylvania or fiber optic strain gauges manufactured by Micron Optics Inc. of Atlanta, Georgia.
[0011] Sensors 20 interface with and are read by appropriate sensor electronics 22.
Sensor electronics 22 may be located on subsea structure 10, lower marine riser package 14 , a remotely operated vehicle (ROV) 12, a thruster package (not shown in the figures), or the like, or a combination thereof. In any embodiment, load information obtained from sensors 20 is used to adjust the thrust output of ROV 12 or a thruster package so as to induce a load equal in force, but opposite in direction, to the induced loads such as current-induced loads.
[0012] In the operation of a preferred embodiment, referring now to Fig. 2, currents, e.g. water currents, apply force on subsea structures such as subsea structure 10, causing subsea structure 10 to move off of desired path 30. ROV 12 is positioned to interface with coupler 5. [0013] Referring now to Fig, 3, once ROV 12 has mated to coupler 5, sensors 20 detect additional shear and bending loads on subsea structure 10. Sensor electronics 22 communicates with ROV 12, which then applies appropriate counter- forces to move subsea structure 10 back onto desired path 30.
[0014] Once the current load and the externally applied counter-force have been applied, an operator can release subsea structure connector 11 and raise subsea structure 10 off of the wellhead without fear of subsea structure 10 or its associated riser, if any, being swept into other equipment. For example, subsea structure 10 may stay vertical during the release and raise operation.
[0015] The foregoing disclosure and description of the inventions are illustrative and explanatory. Various changes in the size, shape, and materials, as well as in the details of the illustrative construction and/or a illustrative method may be made without departing from the spirit of the invention.
Claims
1. A system for monitoring for loads in a subsea structure, comprising: a. a sensor disposed proximate a subsea structure, the sensor configured to detect an induced load on a subsea structure; and b. a sensor data processor operative Iy in communication with the strain sensor.
2. The system of claim 1 , wherein the induced load is at least one of a current-induced load or a load induced by lateral displacement of a vessel.
3. The system of claim 1, wherein the sensor comprises a strain sensor.
4. The system of claim 1, further comprising a load generator operatively in communication with the sensor data processor, the load generator operative to exert a force on the subsea structure in a direction opposed to a direction of a force detected by the strain sensor and in proportion to a load sensed by the strain sensor.
5. The system of claim 4, wherein the load generator is selected from the group of load generators consisting of a remotely operated vehicle or a thrust package.
6. The system of claim 1, wherein the sensor is a plurality of operatively interconnected strain sensors.
7. The system of claim 6, wherein the plurality of strain sensors are disposed radially about the subsea structure.
8. A method of monitoring and counteracting subsea environmentally induced loads, comprising: a. deploying a strain sensor proximate a subsea structure; b. detecting an induced load on the subsea structure; c. communicating the detected induced load to a load processor; and d. using the detected load data to adjust thrust output of the load generator to induce a load equal in force, but opposite in direction, to the detected induced loads.
9. The method of claim 8, wherein the induced load is selected from the group of induced loads comprising a current-induced load or a load induced by lateral displacement of a vessel away from a wellhead.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US95018407P | 2007-07-17 | 2007-07-17 | |
US60/950,184 | 2007-07-17 | ||
US12/174,166 | 2008-07-16 | ||
US12/174,166 US20090056936A1 (en) | 2007-07-17 | 2008-07-16 | Subsea Structure Load Monitoring and Control System |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009012349A1 true WO2009012349A1 (en) | 2009-01-22 |
Family
ID=40260059
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2008/070249 WO2009012349A1 (en) | 2007-07-17 | 2008-07-17 | Subsea structure load monitoring and control system |
Country Status (2)
Country | Link |
---|---|
US (1) | US20090056936A1 (en) |
WO (1) | WO2009012349A1 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7814856B1 (en) | 2009-11-25 | 2010-10-19 | Down Deep & Up, LLC | Deep water operations system with submersible vessel |
US8720579B2 (en) * | 2010-07-15 | 2014-05-13 | Oceaneering International, Inc. | Emergency blowout preventer (EBOP) control system using an autonomous underwater vehicle (AUV) and method of use |
US8851176B2 (en) * | 2011-03-29 | 2014-10-07 | Conocophillips Company | Subsea hydrocarbon recovery |
WO2014011823A1 (en) * | 2012-07-11 | 2014-01-16 | Schlumberger Canada Limited | Communication between downhole tool and surface location |
US10065714B2 (en) * | 2015-02-25 | 2018-09-04 | Onesubsea Ip Uk Limited | In-situ testing of subsea power components |
US10026537B2 (en) | 2015-02-25 | 2018-07-17 | Onesubsea Ip Uk Limited | Fault tolerant subsea transformer |
US9945909B2 (en) | 2015-02-25 | 2018-04-17 | Onesubsea Ip Uk Limited | Monitoring multiple subsea electric motors |
US10767438B2 (en) * | 2015-04-23 | 2020-09-08 | Wanda Papadimitriou | Autonomous blowout preventer |
US10145198B2 (en) * | 2015-04-23 | 2018-12-04 | Wanda Papadimitriou | Autonomous blowout preventer |
US11499388B2 (en) * | 2015-04-23 | 2022-11-15 | Wanda Papadimitriou | Autonomous blowout preventer |
US9404347B1 (en) * | 2015-05-15 | 2016-08-02 | Baker Hughes Incorporated | Apparatus and method for connecting a riser from an offshore rig to a subsea structure |
WO2017019558A1 (en) * | 2015-07-24 | 2017-02-02 | Oceaneering International, Inc | Resident rov signal distribution hub |
US9919771B2 (en) * | 2015-11-18 | 2018-03-20 | Cameron International Corporation | Safety system and method for guiding a dropped suspended load away from equipment and to a safe landing area |
US9719330B2 (en) * | 2015-12-28 | 2017-08-01 | Cameron International Corporation | Subsea equipment pendulum arrestor and method for its use |
US9739101B1 (en) * | 2016-07-13 | 2017-08-22 | Ensco International Incorporated | Riser deflection mitigation |
US10294729B2 (en) * | 2017-10-17 | 2019-05-21 | Ensco International Incorporated | Riser and subsea equipment guidance |
CN113669032B (en) * | 2021-07-22 | 2022-05-10 | 中国石油大学(北京) | Vibration reduction control method, device and system for installation of deepwater drilling riser |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4730677A (en) * | 1986-12-22 | 1988-03-15 | Otis Engineering Corporation | Method and system for maintenance and servicing of subsea wells |
WO2005091712A2 (en) * | 2004-03-22 | 2005-10-06 | Vetco Aibel As | A method and a device for monitoring and/or controlling a load on a tensioned elongated element |
Family Cites Families (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4031544A (en) * | 1975-08-11 | 1977-06-21 | Edo Western Corporation | Sonar/television system for use in underwater exploration |
US4010619A (en) * | 1976-05-24 | 1977-03-08 | The United States Of America As Represented By The Secretary Of The Navy | Remote unmanned work system (RUWS) electromechanical cable system |
US4094159A (en) * | 1976-06-10 | 1978-06-13 | Perry Oceanographics, Inc. | Submersible chamber |
US4205379A (en) * | 1977-05-16 | 1980-05-27 | TRW Inc., Systems & Energy | Position determining and dynamic positioning method and system for floating marine well drill platforms and the like |
GB2069082B (en) * | 1980-02-11 | 1983-10-05 | Brown John Constr | Connector assembly |
US4457378A (en) * | 1982-07-26 | 1984-07-03 | Hughes Tool Company | Flowline pull-in apparatus and method |
US4591292A (en) * | 1984-05-25 | 1986-05-27 | Shell Offshore Inc. | Subsea pull-in tool |
NO305815B1 (en) * | 1995-05-29 | 1999-07-26 | Abb Offshore Technology As | Submergible tool and tool systems for interconnecting submarine pipelines |
NO305001B1 (en) * | 1995-12-22 | 1999-03-15 | Abb Offshore Technology As | Diver-free system and method of replacing an operating component of equipment on a seabed installation |
US5978739A (en) * | 1997-10-14 | 1999-11-02 | Stockton; Thomas R. | Disconnect information and monitoring system for dynamically positioned offshore drilling rigs |
GB2334048B (en) * | 1998-02-06 | 1999-12-29 | Philip Head | Riser system for sub sea wells and method of operation |
NL1009277C2 (en) * | 1998-05-28 | 1999-11-30 | Francois Bernard | Method and device for accurately placing relatively heavy objects on and removing heavy objects from the seabed. |
US6350085B1 (en) * | 1998-08-04 | 2002-02-26 | Sonsub International, Inc. | Cable deployment system and method of using same |
US6386290B1 (en) * | 1999-01-19 | 2002-05-14 | Colin Stuart Headworth | System for accessing oil wells with compliant guide and coiled tubing |
US6422315B1 (en) * | 1999-09-14 | 2002-07-23 | Quenton Wayne Dean | Subsea drilling operations |
US6167831B1 (en) * | 1999-09-20 | 2001-01-02 | Coflexip S.A. | Underwater vehicle |
US6763889B2 (en) * | 2000-08-14 | 2004-07-20 | Schlumberger Technology Corporation | Subsea intervention |
US6588980B2 (en) * | 2001-05-15 | 2003-07-08 | Halliburton Energy Services, Inc. | Underwater cable deployment system and method |
US6725924B2 (en) * | 2001-06-15 | 2004-04-27 | Schlumberger Technology Corporation | System and technique for monitoring and managing the deployment of subsea equipment |
US7311151B2 (en) * | 2002-08-15 | 2007-12-25 | Smart Drilling And Completion, Inc. | Substantially neutrally buoyant and positively buoyant electrically heated flowlines for production of subsea hydrocarbons |
GB2382636A (en) * | 2001-12-01 | 2003-06-04 | Coflexip | Apparatus for connecting a pipe to a sub-sea structure |
US6591913B2 (en) * | 2001-12-12 | 2003-07-15 | Oceaneering International, Inc. | System and method for lessening impact on Christmas trees during downhole operations involving Christmas trees |
US6796261B2 (en) * | 2002-02-28 | 2004-09-28 | Abb Offshore Systems, Inc. | Subsea deployable drum for laying lines |
FR2840951B1 (en) * | 2002-06-13 | 2004-12-24 | Inst Francais Du Petrole | INSTRUMENTATION ASSEMBLY OF AN OFFSHORE DRILLING RISER |
US7194913B2 (en) * | 2002-08-26 | 2007-03-27 | Shell Oil Company | Apparatuses and methods for monitoring stress in steel catenary risers |
US6776559B1 (en) * | 2002-09-30 | 2004-08-17 | Gulf Fiber Corporation | Method and apparatus for deploying a communications cable below the surface of a body of water |
US7150324B2 (en) * | 2002-10-04 | 2006-12-19 | Halliburton Energy Services, Inc. | Method and apparatus for riserless drilling |
GB2420809B (en) * | 2002-11-12 | 2006-12-13 | Vetco Gray Inc | Drilling and producing deep water subsea wells |
US7000903B2 (en) * | 2003-03-24 | 2006-02-21 | Oceaneering International, Inc. | Wireline subsea metering head and method of use |
US6902199B2 (en) * | 2003-05-16 | 2005-06-07 | Offshore Systems Inc. | ROV activated subsea connector |
FR2856160B1 (en) * | 2003-06-11 | 2005-07-22 | Inst Francais Du Petrole | AUTOMATIC CONTROL METHOD FOR POSITIONING THE LOWER END OF A FILIFORM STRUCTURE, IN PARTICULAR A PETROLEUM CONDUIT, AT SEA |
US20050276665A1 (en) * | 2003-07-24 | 2005-12-15 | Entralgo Roger D | Remotely operated deployment system and method of use |
US20050100414A1 (en) * | 2003-11-07 | 2005-05-12 | Conocophillips Company | Composite riser with integrity monitoring apparatus and method |
US7191836B2 (en) * | 2004-08-02 | 2007-03-20 | Kellogg Brown & Root Llc | Dry tree subsea well communications apparatus and method using variable tension large offset risers |
US8074720B2 (en) * | 2004-09-28 | 2011-12-13 | Vetco Gray Inc. | Riser lifecycle management system, program product, and related methods |
US7328741B2 (en) * | 2004-09-28 | 2008-02-12 | Vetco Gray Inc. | System for sensing riser motion |
US7487836B2 (en) * | 2005-03-11 | 2009-02-10 | Saipem America Inc. | Riserless modular subsea well intervention, method and apparatus |
US7416025B2 (en) * | 2005-08-30 | 2008-08-26 | Kellogg Brown & Root Llc | Subsea well communications apparatus and method using variable tension large offset risers |
US20080217022A1 (en) * | 2007-03-06 | 2008-09-11 | Schlumberger Technology Corporation | Subsea communications multiplexer |
US20080302535A1 (en) * | 2007-06-08 | 2008-12-11 | David Barnes | Subsea Intervention Riser System |
US7926579B2 (en) * | 2007-06-19 | 2011-04-19 | Schlumberger Technology Corporation | Apparatus for subsea intervention |
-
2008
- 2008-07-16 US US12/174,166 patent/US20090056936A1/en not_active Abandoned
- 2008-07-17 WO PCT/US2008/070249 patent/WO2009012349A1/en active Search and Examination
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4730677A (en) * | 1986-12-22 | 1988-03-15 | Otis Engineering Corporation | Method and system for maintenance and servicing of subsea wells |
WO2005091712A2 (en) * | 2004-03-22 | 2005-10-06 | Vetco Aibel As | A method and a device for monitoring and/or controlling a load on a tensioned elongated element |
Also Published As
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US20090056936A1 (en) | 2009-03-05 |
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