US3866676A - Protective structure for submerged wells - Google Patents

Protective structure for submerged wells Download PDF

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Publication number
US3866676A
US3866676A US363289A US36328973A US3866676A US 3866676 A US3866676 A US 3866676A US 363289 A US363289 A US 363289A US 36328973 A US36328973 A US 36328973A US 3866676 A US3866676 A US 3866676A
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United States
Prior art keywords
caisson
flow
well
flow control
control means
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
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US363289A
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English (en)
Inventor
Robert B Burns
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Texaco Development Corp
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Texaco Development Corp
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Filing date
Publication date
Application filed by Texaco Development Corp filed Critical Texaco Development Corp
Priority to US363289A priority Critical patent/US3866676A/en
Priority to NO741545A priority patent/NO141226C/no
Priority to CA200,652A priority patent/CA995583A/en
Application granted granted Critical
Publication of US3866676A publication Critical patent/US3866676A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
    • E21B33/037—Protective housings therefor
    • 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
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/02—Valve arrangements for boreholes or wells in well heads
    • E21B34/025—Chokes or valves in wellheads and sub-sea wellheads for variably regulating fluid flow
    • 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
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/02—Valve arrangements for boreholes or wells in well heads
    • E21B34/04—Valve arrangements for boreholes or wells in well heads in underwater 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
    • 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
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells

Definitions

  • ABSTRACT A hydrocarbon producing well located at an offshore site, completely submerged beneath the water.
  • the well includes a flow line extending from a reservoir in the substrate, which flow line passes along the floor of the body of water, and thence to a collection pointv
  • Flow control mechanism at the well head regulates fluid flow through said line.
  • the casing is provided with means for actuating the flow control mechanism whereby to discontinue fluid flow through the line under emergency conditions at such time as the actuating means is tripped.
  • means for actuating the well flow control system to regulate fluid flow therethrough.
  • Such means can include the normal blow-out preventer type mechanism utilized during the drilling period, down hole chokes, or similar valving inserted in either the well structure or in the flow line, to be remotely actuated at any time that the flow requires regulation.
  • control lines to such equipment are always exposed and susceptible to damage or breakage. Under such circumstances the equipment could be designed such that the well would be automatically closed in. The chance exists though that the control lines will be damaged such as to maintain the well uncontrollable.
  • emergency flow control means is provided within the submerged well at a point substantially below the floor of the substrate.
  • the emergency control means would remain relatively safe.
  • the actual flow control means such as blow-out preventers or similar emergency valve mechanisms, are positioned within the well main flow line.
  • An actuating media normally fluid or gas powered, is connected to the flow control means whereby to actuate the latter to a closed position whereby to shut off fluid flow.
  • Said actuating mechanism or system is likewise positioned sufficiently low in the substrate to be safe from damage.
  • a triggering means is connected to the actuating mechanism or powering system, and to the well structure upper end such that when the latter is damaged by an ice mass, the triggering means will automatically come into operation to adjust the flow controllers to a closed position.
  • FIG. 1 is an elevation view in cross section of the submerged well contemplated.
  • FIG. 2 is a top view of FIG. 1.
  • FIG. 3 is a segmentary view on an enlarged scale and in cross section of a portion of the structure shown in FIG. 1.
  • FIG. 4 is an elevation view in partial cross section illustrating the present system schematically.
  • the present well structure is shown embedded into the substrate S beneath a body of water W, the depth D of which can vary from several, to several hundred feet. It has been determined that over a period of time, the scouring action of ice masses and the like at the Alaskan North Slope, has been limited to a depth of approximately 50 feet into the sea floor. Further, in the Beaufort Sea area much of the substrate beneath the water is comprised primarily of sand and gravel, and is susceptible to being scoured and gouged.
  • the present well 10 follows to a large extent the standard construction, comprising a plurality of concentrically disposed casing members 11, 12 and 13 which extend downwardly and are cemented together and into the substrate S.
  • a string of production tubing 15 extends downwardly through the respective casing lengths, terminating at its lower end within the hydrocarbon reservoir area.
  • the upper end of said production tubing 15 is supported at a pad 18 which rests on the substrate surface.
  • Flow control means 14 is positioned at the upper end of the production line 15 to regulate and control the passage of fluids therethrough. Said flow control means 14 as shown, is embedded a sufficient distance D below the ocean floor F to put the flow control means beyond the reach of damaging ice that might contact the well.
  • the flow control means 14 can include the usual Christmas tree type regulating valve or valves which are manually adjusted. Preferably, said valves are remotely adjusted through a suitable mechanism to afford a desired fluid flow rate from the well.
  • emergency shut off means 17 comprises a shut off valve of the kind peculiar to a drilling or producing operation such as a blowout preventer arrangement. The latter is normally connected directly into the flow line to discontinue flow in the event of a runaway or out of control well.
  • Said blow-out preventer includes in effect valve means positioned in, and movable transversely of the flow line, being normally retained in the fully opened position. With the advent of an uncontrollable flow condition arising within the well, the emergency valve mechanism is actuated to fully close, whereby to discontinue further flow from the well.
  • the lower end of flow line 16 communicates with the emergency valving 17 to define the fluid path.
  • the upper end of said line 16 is communicated with a pipeline 19 which is supported along the surface of substrate S.
  • Said pipeline in the usual manner carries a stream of hydrocarbon fluid from the well. It normally connects with or is manifolded with adjacent offshore wells to lead the entire produced product to a storage or refining facility 20.
  • an elongated, two sectioned caisson comprising a lower end 21 and an upper end 22.
  • the caisson is embedded into the substrate S such that lower end 22 is at a depth below which ice scouring can be expected. As herein noted, said depth is determined to be approximately 50 to 60 feet.
  • Lower caisson 21 can be embedded by the usual methods such as driving, jetting or a combination of the two.
  • the caisson lower end is a relatively heavy walled cylindrical member adapted to be urged into the substratum thereby to form a foundation for the upper end 22.
  • Caisson upper end 22 comprises a plurality of horizontally connected circular segments such as 24 and 25 which are joined one to the other solely at a plurality of welded or bolted breakaway joints 20, a and 20b. Said upper end is so arranged that in the event of contact with an ice mass the entire caisson will not be damaged or deformed. Rather, only particular segments will be effected so as to break from the remaining lower part of the caisson at the respective breakaway joints.
  • Caisson upper end 22 comprises a plurality of substantially cylindrical steel members.
  • the latter are constructed with sufficient structural strength to serve the function of defining a water filled well in the substrate from the surface of the latter. While the walls of the respective segments need not be as heavy as the wall thickness of the caisson lower end 21, they are of sufficient structural capability to withstand the inward lateral forces provided by the substrate. Since the interior of caisson upper end 22 will be evacuated, the cavity so formed will remain substantially filled with water at all times.
  • Emergency flow shut off equipment exemplified by flow control means 17, is powered preferably by a hy draulic or pneumatic system positioned immediately adjacent to the well head. In such a position said system is beyond the reach of scouring ice which might cause damage thereto. While it is noted above that the system can embody a hydraulic or pneumatic medium, for the purpose of the present invention a pneumatic system will be specifically delineated.
  • emergency actuated systems are presently incorporated on drilling vessels, platforms and the like, and connected to blow-out preventers at a well head particularly during the drilling of an exploratory well.
  • the powering system normally functions in a manner to provide a quick power source for closing blow-out preventers at the well head at such time as an emergency blow-out is anticipated or occurs.
  • the present arrangement provides a bank of pressurized gas cylinders 26 which are suitably connected through manifold means 27 and pressure regulators 28 to provide the necessary force for actuating the flow control member 17 to closed position, thus blocking the passage of fluid upwardly through line 15 and into line 16.
  • the flow of gaseous actuating medium is controlled through a line valve 29 positioned in main line 31-32 connecting said manifold to emergency shut off valve 17.
  • Valve 29 embodies no particular structure with the exception that it is quick acting. Said valve is sufficiently heavy to accommodate the high pressure normally maintained in gas cylinders 26 to provide the necessary closing force to discontinue fluid flow from the well.
  • the entire pressure system for shut off means 17 can be enclosed within a suitable closure member 33 to protect it from the environment.
  • Said closure 33 further can be extended to enclose or communicate with a portion of the well to provide a degree of heating to the system by virtue of heat transfer from the hot crude product.
  • uppercaisson 22 is substantially filled with water
  • the closure member 33 surrounding the power system may likewise be water filled and yet surround a portion of the heated flow line such as control valve 14.
  • the upward flowing, normally warm crude product will therefore continuously transfer sufficient heat to the surrounding water to prevent the system from being unduly affected by the normally cold water.
  • the means for actuating the powering system and thus valve 17, includes a triggering mechanism connected to flow line valve 29.
  • Said triggering mechanism can include a number of embodiments susceptible to adjustment at such time as one or more of the caisson segments 24-25 is deformed due to being laterally impinged on by a body of ice scouring the substrate.
  • the action of the moving ice mass will tend to deform one or more of the caisson segments in accordance with the bulk of the ice mass.
  • the upper segment such as 24 will tend to separate from the next lower segment thereby in effect leaving the entire lower part of the caisson intact.
  • the power system triggering mechanism includes a plurality of tensioned cables 36, 37 and 38 which extend longitudinally of the caisson 22, being slidably guided at each segment through loop guides 39 and 41. The latter depend inwardly from the caisson wall and are positioned adjacent one to the other.
  • each of said cables is connected to operating arm 42 of line control valve 29.
  • Said cable when thus adjusted from its normal tensioned condition by virtue of a deforming of the caisson segments, displaces the operating arm 40 thereby permitting the valve 29 to immediately move to fully open position.
  • the respective triggering cables 36, 37 and 39 are disposed. at spaced intervals about the periphery of the caisson 22 to be in position to be tripped or adjusted, regardless of the direction from which scouring ice approaches the caisson.
  • the upper ends of the respective cables are anchored to the outwardly radiating arms 42, 43 and 44 of a spider bracket 46, which is in turn connected to the upper end of flow line 16.
  • Saidbracket 46 includes a split center collar 47 which encircles and is affixed to the vertical portion of said line 16 at a point beyond the upper'edge of caisson segment 24.
  • the respective outwardly radiating bracket arms in turn extend beyondv the said segment upper lip of the caisson segment, either resting on the latter or merely spaced therefrom to permit movement therebetween.
  • the crude carrying line 16 in effect is in a quasi-floating position with the spider bracket 46 rigidly mounted thereto.
  • any appreciable displacement of pipeline 19 as a result of being displaced by a moving ice mass will cause the line 16 to be offset. Consequently one or more ofthe triggering cables 36, 37 and 38 will be similarly displaced as to operate control valve arm. Said action will close valve 29 and discontinue flow through the pipeline 19.
  • the effect will be the same. That is, the. triggering mechanism at the caisson will be set into motion such that one or more of the triggering cables will displace the control arm to fully open control valve 29.
  • controller 17 is maintained open by virtue of valve 29 being open to apply pressure to said valve 17. Thereafter, with release of pressure under emergency conditions, valve 17 will automatically adjust to the closed position.
  • Well structure for a hydrocarbon fluid producing well submerged beneath a body of water subject to moving ice masses and other floating objects which might scour the substrate, said well including;
  • a caisson surrounding the upper end of said flow line, extending downwardly into the substrate from the surface of the latter, and defining a cavity
  • flow control means connected into said flow line. being operable to regulate the fluid passage through the latter, and being disposed at the floor of said cavity a predetermined distance to avoid contact with substrate scouring ice masses,
  • said flow control means including a remotely oper ated flow shut off means, and a trigger mechanism connected to said caisson and to said flow shut off means respectively, whereby to actuate the latter and discontinue said fluid flow at such time as said caisson is damaged by scouring action of a moving ice mass.
  • said caisson includes; cylindrical upper and lower sections, said upper section extending from the substrate surface to said flow control means, and including a plurality of horizontally positioned caisson segments being connected at peripherally spaced breakaway joints.
  • said caisson includes; an upper end having a lip extending upward beyond the substrate surface, and said trigger mechanism being operably connected to said caisson upper end.
  • said flow control means includes; a power source disposed adjacent to the flow control means at the floor of said cavity, and communicated therewith.
  • valve means being connected to said trigger mechanism whereby to be operated in response to displacement of the trigger mechanism when said well caisson is contacted by scouring ice.
  • said. flow control means includes; a quick acting valve communicated with a reservoir holding a pressurized actuating fluid, said quick acting valve being normally maintained in fully open position, and said trigger mechanism being operably connected to said pressurized actuating fluid whereby to regulate the same and thereby adjust said quick acting valve to a closed position.
  • said caisson includes; at least a portion thereof being formed of horizonally disposed segmented sections adjacent of said sections being connected at peripherally spaced breakaway joints.
  • said trigger mechanism includes cable means operably connected to the respective horizontally positioned caisson segments to adjust said flow control means to a closed position when the relative disposition of a caisson segment is disrupted due to scouring action of ice.
  • said trigger means includes at least one 8 from said collar, and said trigger mechanism including a plurality of cables, each connected at one end thereof to said flow line bracket and to the respective caisson horizontal segments, whereby to adjust said flow control means to a closed position when said flow line is vertically displaced with respect to said caisson

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Bridges Or Land Bridges (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
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US363289A 1973-05-23 1973-05-23 Protective structure for submerged wells Expired - Lifetime US3866676A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US363289A US3866676A (en) 1973-05-23 1973-05-23 Protective structure for submerged wells
NO741545A NO141226C (no) 1973-05-23 1974-04-29 Broennkonstruksjon for en produksjonsbroenn
CA200,652A CA995583A (en) 1973-05-23 1974-05-23 Protective structure for submerged wells

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4126183A (en) * 1976-12-09 1978-11-21 Deep Oil Technology, Inc. Offshore well apparatus with a protected production system
US4193455A (en) * 1978-04-14 1980-03-18 Chevron Research Company Split stack blowout prevention system
US4283159A (en) * 1979-10-01 1981-08-11 Johnson Albert O Protective shroud for offshore oil wells
US5310286A (en) * 1992-04-21 1994-05-10 Tornado Drill Ltd. Cased glory hole system
US5462114A (en) * 1993-11-19 1995-10-31 Catanese, Jr.; Anthony T. Shut-off control system for oil/gas wells
US5535826A (en) * 1992-06-17 1996-07-16 Petroleum Engineering Services Limited Well-head structures
US5865246A (en) * 1995-06-05 1999-02-02 Petroleum Engineering Services Limited Ball valves
US6457528B1 (en) * 2001-03-29 2002-10-01 Hunting Oilfield Services, Inc. Method for preventing critical annular pressure buildup
US20030010499A1 (en) * 2000-02-18 2003-01-16 Qvam Helge Andreas Method for thermally protecting subsea installations, and apparatus for implementing such thermal protection
US20110303417A1 (en) * 2009-03-10 2011-12-15 Moegedal Knut Subsea well template
US8894325B2 (en) 2010-05-04 2014-11-25 Oxus Recovery Solutions, Inc. Submerged hydrocarbon recovery apparatus
US8967273B2 (en) * 2013-03-13 2015-03-03 Conocophillips Company System for detecting, containing and removing hydrocarbon leaks in a subsea environment
KR20150079978A (ko) * 2012-12-07 2015-07-08 엑손모빌 업스트림 리서치 캄파니 취약부를 가진 흡입 케이슨 및 흡입 케이슨을 설치하는 방법
US20150197907A1 (en) * 2014-01-14 2015-07-16 Conocophillips Company Method of forming a mudline cellar for offshore arctic drilling
US10364609B2 (en) * 2015-09-15 2019-07-30 Noble Drilling Services Inc. Method for excavating mud line cellar for subsea well drilling

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU5980294A (en) * 1993-12-03 1995-06-19 Kvaerner Energy A.S. Method for developing an offshore hydrocarbon reservoir and an underwater station for use in exploring an offshore hydrocarbon reservoir

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3063500A (en) * 1958-10-03 1962-11-13 Campbell F Logan Underwater christmas tree protector
US3366173A (en) * 1965-09-29 1968-01-30 Mobil Oil Corp Subsea production system
US3419076A (en) * 1965-08-12 1968-12-31 Otis Eng Co Surface condition responsive subsurface safety valve system
US3454083A (en) * 1967-06-29 1969-07-08 Mobil Oil Corp Fail-safe subsea fluid transportation system
US3590920A (en) * 1969-03-12 1971-07-06 Shaffer Tool Works Remote-controlled oil well pipe shear and shutoff apparatus
US3592263A (en) * 1969-06-25 1971-07-13 Acf Ind Inc Low profile protective enclosure for wellhead apparatus
US3766979A (en) * 1972-04-20 1973-10-23 J Petrick Well casing cutter and sealer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3063500A (en) * 1958-10-03 1962-11-13 Campbell F Logan Underwater christmas tree protector
US3419076A (en) * 1965-08-12 1968-12-31 Otis Eng Co Surface condition responsive subsurface safety valve system
US3366173A (en) * 1965-09-29 1968-01-30 Mobil Oil Corp Subsea production system
US3454083A (en) * 1967-06-29 1969-07-08 Mobil Oil Corp Fail-safe subsea fluid transportation system
US3590920A (en) * 1969-03-12 1971-07-06 Shaffer Tool Works Remote-controlled oil well pipe shear and shutoff apparatus
US3592263A (en) * 1969-06-25 1971-07-13 Acf Ind Inc Low profile protective enclosure for wellhead apparatus
US3766979A (en) * 1972-04-20 1973-10-23 J Petrick Well casing cutter and sealer

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4126183A (en) * 1976-12-09 1978-11-21 Deep Oil Technology, Inc. Offshore well apparatus with a protected production system
US4193455A (en) * 1978-04-14 1980-03-18 Chevron Research Company Split stack blowout prevention system
US4283159A (en) * 1979-10-01 1981-08-11 Johnson Albert O Protective shroud for offshore oil wells
US5310286A (en) * 1992-04-21 1994-05-10 Tornado Drill Ltd. Cased glory hole system
US5535826A (en) * 1992-06-17 1996-07-16 Petroleum Engineering Services Limited Well-head structures
US5462114A (en) * 1993-11-19 1995-10-31 Catanese, Jr.; Anthony T. Shut-off control system for oil/gas wells
US5865246A (en) * 1995-06-05 1999-02-02 Petroleum Engineering Services Limited Ball valves
US20030010499A1 (en) * 2000-02-18 2003-01-16 Qvam Helge Andreas Method for thermally protecting subsea installations, and apparatus for implementing such thermal protection
US6889770B2 (en) * 2000-02-18 2005-05-10 Abb Offshore Systems As Method for thermally protecting subsea installations, and apparatus for implementing such thermal protection
US6457528B1 (en) * 2001-03-29 2002-10-01 Hunting Oilfield Services, Inc. Method for preventing critical annular pressure buildup
US20110303417A1 (en) * 2009-03-10 2011-12-15 Moegedal Knut Subsea well template
US9217315B2 (en) * 2009-03-10 2015-12-22 Aker Subsea As Subsea well template
US8894325B2 (en) 2010-05-04 2014-11-25 Oxus Recovery Solutions, Inc. Submerged hydrocarbon recovery apparatus
KR20150079978A (ko) * 2012-12-07 2015-07-08 엑손모빌 업스트림 리서치 캄파니 취약부를 가진 흡입 케이슨 및 흡입 케이슨을 설치하는 방법
US20150299974A1 (en) * 2012-12-07 2015-10-22 Adel H. Younan Suction Caisson with Weakened Section and Method for Installing the Same
US9394662B2 (en) * 2012-12-07 2016-07-19 Exxonmobil Upstream Research Company Suction caisson with weakened section and method for installing the same
US8967273B2 (en) * 2013-03-13 2015-03-03 Conocophillips Company System for detecting, containing and removing hydrocarbon leaks in a subsea environment
US20150197907A1 (en) * 2014-01-14 2015-07-16 Conocophillips Company Method of forming a mudline cellar for offshore arctic drilling
US10267009B2 (en) * 2014-01-14 2019-04-23 Conocophillips Company Method of forming a mudline cellar for offshore arctic drilling
US10364609B2 (en) * 2015-09-15 2019-07-30 Noble Drilling Services Inc. Method for excavating mud line cellar for subsea well drilling

Also Published As

Publication number Publication date
NO141226B (no) 1979-10-22
CA995583A (en) 1976-08-24
NO741545L (no) 1974-11-26
NO141226C (no) 1980-01-30

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