GB2121458A - Oil production system - Google Patents

Oil production system Download PDF

Info

Publication number
GB2121458A
GB2121458A GB08315011A GB8315011A GB2121458A GB 2121458 A GB2121458 A GB 2121458A GB 08315011 A GB08315011 A GB 08315011A GB 8315011 A GB8315011 A GB 8315011A GB 2121458 A GB2121458 A GB 2121458A
Authority
GB
United Kingdom
Prior art keywords
riser
wells
oil
subsea
base
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.)
Withdrawn
Application number
GB08315011A
Other versions
GB8315011D0 (en
Inventor
John Francis Ballanty Marriott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BP PLC
Original Assignee
BP PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BP PLC filed Critical BP PLC
Priority to GB08315011A priority Critical patent/GB2121458A/en
Publication of GB8315011D0 publication Critical patent/GB8315011D0/en
Publication of GB2121458A publication Critical patent/GB2121458A/en
Withdrawn legal-status Critical Current

Links

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
    • E21B43/017—Production satellite stations, i.e. underwater installations comprising a plurality of satellite well heads connected to a central station
    • E21B43/0175—Hydraulic schemes for production manifolds
    • 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
    • E21B33/068—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells
    • E21B33/076—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells specially adapted for underwater installations

Landscapes

  • 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)
  • Earth Drilling (AREA)

Abstract

A subsea oil production system comprises a plurality of subsea wells 2, 3 and a separate subsea riser base 1.The wells 2, 3 and the riser base 1 are connected through a manifold in such a manner that oil produced from any or all of the wells is passed to the riser base. The rise base terminates in a re-entry hub 4 adapted for connection with a riser connector package. The riser leads to a floating storage vessel. <IMAGE>

Description

SPECIFICATION Oil production system This invention relates to an oil production system for use at an offshore location.
In recent years a number of offshore oilfields have been located which are too small to be economically developed using a fixed production platform supporting a multiplicity of producing wells. However these oilfields are believed to contain significant amounts of recoverable oil and there is therefore a need for a production system that is less expensive than the fixed platforms referred to above.
Our copending application GB 2 066 758 A discloses an oil production system suitable for use at an offshore location comprising a floating storage vessel to receive the produced oil and having means for dynamic positioning and a riser supported from the vessel and connectable at its lower end to a subsea well head, the vessel further having means for separating the oil and its associated gas and employing the latter as fuel to power the dynamic positioning means.
This system has now been improved and developed to be capable of passing the production of a plurality of wells through a common riser base.
Thus according to the present invention there is provided a subsea oil production system comprising a plurality of subsea wells and a separate subsea iiser base wherein the wells and the riser base are connected through a manifold in such a manner that oil produced from any or all of the wells is passed to the riser base, the riser base terminating in a re-entry hub (REH) adapted for engagement with a riser connector package (RCP).
Preferably the flow from each well is controlled by a choke operated by a wireline through the riser base, although some other arrangement for choke control of the wells may be employed if desired.
Preferably each well also terminates in a reentry hub adapted for connection with the riser connector package.
The re-entry hub preferably comprises a central bore for produced oil and a series of concentric grooves on the surface adapted to interface with the riser connector package. The riser connector package is similarly constructed and the resulting channels formed by the interfacing grooves form passageways for control fluids without requiring orientation of the riser connector package.
When the system is producing, a riser will be connected at its lower end to the riser connector package and the upper end of the riser will be supported from a floating storage vessel adapted to receive and store the oil.
The invention is iliustrated with reference to the accompanying drawings which are schematic diagrams.
With reference to Fig. 1, the system comprises a riser base 1 and two production wells 2 and 3.
The riser base comprises a re-entry hub 4 and a manifold block 5. The top surface of the hub is adapted to interface with the riser connector package (not shown). The hub contains a central bore 6 for produced oil and a series of concentric grooves 7 which when matched with corresponding grooves in the riser connector passage provide channels for hydraulic control lines 8 for the wells.
The wells 2 and 3 comprise subsea tree assemblies 9 and 10 topped by similar re-entry hubs 11 and 12. The hubs are covered by high pressure caps 13 and 14.
The production wellheads are mounted within a pre-installed drilling template (not shown). The manifold block is mounted independently.
Production from wells 2 and 3 is taken by lines 15 and 16 to the manifold block 5 where the flows are controlled by wire line serviced retrievable chokes 1 7 and 1 8 before uniting to flow through the bore 6, controlled by valve 1 9.
Well 2 can be isolated by isolation valves 20 and 21 if and when desired and well 3 by corresponding valves (not shown).
If desired, the cap 13 or 14 may be removed from an isolated well and the riser connector package may be brought into engagement with the re-entry hub 11 or 12.
Fig. 2 represents the riser base 1 with the two satellite wells 2 and 3 supplying oil to it by lines 1 5 and 1 6 so that the total production is passed up the riser 6 to the surface vessel 22.
Claims
1. A subsea oil production system comprising a plurality of subsea wells and a separate subsea riser base wherein the wells and the riser base are connected through a manifold in such a manner that oil produced from any or all of the wells is passed to the riser base, the riser base terminating in a re-entry hub adapted for connection with a riser connector package.
2. A subsea oil production system according to claim 1 wherein the flow from each well is controlled by a choke operated by a wireline through the riser base.
3. A subsea oil production system according to either of the preceding claims wherein each well terminates in a re-entry hub adapted for connection with the riser connector package.
4. A subsea oil production system according to any of the preceding claims wherein the re-entry hub comprises a central bore for produced oil and a series of concentric grooves on the surface adapted to interface with the riser connector package and the package comprises a central bore for produced oil and a series of concentric grooves on the surface adapted to interface with
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Oil production system This invention relates to an oil production system for use at an offshore location. In recent years a number of offshore oilfields have been located which are too small to be economically developed using a fixed production platform supporting a multiplicity of producing wells. However these oilfields are believed to contain significant amounts of recoverable oil and there is therefore a need for a production system that is less expensive than the fixed platforms referred to above. Our copending application GB 2 066 758 A discloses an oil production system suitable for use at an offshore location comprising a floating storage vessel to receive the produced oil and having means for dynamic positioning and a riser supported from the vessel and connectable at its lower end to a subsea well head, the vessel further having means for separating the oil and its associated gas and employing the latter as fuel to power the dynamic positioning means. This system has now been improved and developed to be capable of passing the production of a plurality of wells through a common riser base. Thus according to the present invention there is provided a subsea oil production system comprising a plurality of subsea wells and a separate subsea iiser base wherein the wells and the riser base are connected through a manifold in such a manner that oil produced from any or all of the wells is passed to the riser base, the riser base terminating in a re-entry hub (REH) adapted for engagement with a riser connector package (RCP). Preferably the flow from each well is controlled by a choke operated by a wireline through the riser base, although some other arrangement for choke control of the wells may be employed if desired. Preferably each well also terminates in a reentry hub adapted for connection with the riser connector package. The re-entry hub preferably comprises a central bore for produced oil and a series of concentric grooves on the surface adapted to interface with the riser connector package. The riser connector package is similarly constructed and the resulting channels formed by the interfacing grooves form passageways for control fluids without requiring orientation of the riser connector package. When the system is producing, a riser will be connected at its lower end to the riser connector package and the upper end of the riser will be supported from a floating storage vessel adapted to receive and store the oil. The invention is iliustrated with reference to the accompanying drawings which are schematic diagrams. With reference to Fig. 1, the system comprises a riser base 1 and two production wells 2 and 3. The riser base comprises a re-entry hub 4 and a manifold block 5. The top surface of the hub is adapted to interface with the riser connector package (not shown). The hub contains a central bore 6 for produced oil and a series of concentric grooves 7 which when matched with corresponding grooves in the riser connector passage provide channels for hydraulic control lines 8 for the wells. The wells 2 and 3 comprise subsea tree assemblies 9 and 10 topped by similar re-entry hubs 11 and 12. The hubs are covered by high pressure caps 13 and 14. The production wellheads are mounted within a pre-installed drilling template (not shown). The manifold block is mounted independently. Production from wells 2 and 3 is taken by lines 15 and 16 to the manifold block 5 where the flows are controlled by wire line serviced retrievable chokes 1 7 and 1 8 before uniting to flow through the bore 6, controlled by valve 1 9. Well 2 can be isolated by isolation valves 20 and 21 if and when desired and well 3 by corresponding valves (not shown). If desired, the cap 13 or 14 may be removed from an isolated well and the riser connector package may be brought into engagement with the re-entry hub 11 or 12. Fig. 2 represents the riser base 1 with the two satellite wells 2 and 3 supplying oil to it by lines 1 5 and 1 6 so that the total production is passed up the riser 6 to the surface vessel 22. Claims
1. A subsea oil production system comprising a plurality of subsea wells and a separate subsea riser base wherein the wells and the riser base are connected through a manifold in such a manner that oil produced from any or all of the wells is passed to the riser base, the riser base terminating in a re-entry hub adapted for connection with a riser connector package.
2. A subsea oil production system according to claim 1 wherein the flow from each well is controlled by a choke operated by a wireline through the riser base.
3. A subsea oil production system according to either of the preceding claims wherein each well terminates in a re-entry hub adapted for connection with the riser connector package.
4. A subsea oil production system according to any of the preceding claims wherein the re-entry hub comprises a central bore for produced oil and a series of concentric grooves on the surface adapted to interface with the riser connector package and the package comprises a central bore for produced oil and a series of concentric grooves on the surface adapted to interface with the re-entry hub, the resulting channels formed by the interfacing grooves forming passageways for control fluids.
5. A subsea oil production system as hereinbefore described with reference to the accompanying drawing.
GB08315011A 1982-06-05 1983-06-01 Oil production system Withdrawn GB2121458A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08315011A GB2121458A (en) 1982-06-05 1983-06-01 Oil production system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8216425 1982-06-05
GB08315011A GB2121458A (en) 1982-06-05 1983-06-01 Oil production system

Publications (2)

Publication Number Publication Date
GB8315011D0 GB8315011D0 (en) 1983-07-06
GB2121458A true GB2121458A (en) 1983-12-21

Family

ID=26283034

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08315011A Withdrawn GB2121458A (en) 1982-06-05 1983-06-01 Oil production system

Country Status (1)

Country Link
GB (1) GB2121458A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987001159A1 (en) * 1985-08-12 1987-02-26 Cbv Indústria Mecânica S.A. Valve module, specially for undersea petroleum wells
WO1987001157A1 (en) * 1985-08-12 1987-02-26 Cbv Indústria Mecânica S.A. Valve module, specially for undersea petroleum wells
WO1987001158A1 (en) * 1985-08-12 1987-02-26 Cbv Indústria Mecânica S.A. Valve module, specially for undersea petroleum wells
US20170211354A1 (en) * 2004-02-26 2017-07-27 Onesubsea Ip Uk Limited Connection system for subsea flow interface equipment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1472229A (en) * 1973-08-17 1977-05-04 Putnam P Subsea well-head installations
GB1546227A (en) * 1975-08-27 1979-05-23 Akers Mek Verksted As Junction housing for use ind undersea oil wells
GB2044319A (en) * 1979-02-22 1980-10-15 Armco Inc Subsea production system
GB2059483A (en) * 1979-10-02 1981-04-23 Fmc Corp Method and apparatus for controlling subsea well template production systems
GB2095306A (en) * 1981-03-23 1982-09-29 Mobil Oil Corp Subsea riser manifold system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1472229A (en) * 1973-08-17 1977-05-04 Putnam P Subsea well-head installations
GB1546227A (en) * 1975-08-27 1979-05-23 Akers Mek Verksted As Junction housing for use ind undersea oil wells
GB2044319A (en) * 1979-02-22 1980-10-15 Armco Inc Subsea production system
GB2059483A (en) * 1979-10-02 1981-04-23 Fmc Corp Method and apparatus for controlling subsea well template production systems
GB2095306A (en) * 1981-03-23 1982-09-29 Mobil Oil Corp Subsea riser manifold system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987001159A1 (en) * 1985-08-12 1987-02-26 Cbv Indústria Mecânica S.A. Valve module, specially for undersea petroleum wells
WO1987001157A1 (en) * 1985-08-12 1987-02-26 Cbv Indústria Mecânica S.A. Valve module, specially for undersea petroleum wells
WO1987001158A1 (en) * 1985-08-12 1987-02-26 Cbv Indústria Mecânica S.A. Valve module, specially for undersea petroleum wells
US20170211354A1 (en) * 2004-02-26 2017-07-27 Onesubsea Ip Uk Limited Connection system for subsea flow interface equipment
US10508518B2 (en) * 2004-02-26 2019-12-17 Onesubsea Ip Uk Limited Connection system for subsea flow interface equipment

Also Published As

Publication number Publication date
GB8315011D0 (en) 1983-07-06

Similar Documents

Publication Publication Date Title
US5025865A (en) Subsea oil production system
US5873416A (en) Drilling, production, test, and oil storage caisson
CA2329775C (en) Flying lead workover interface system
KR102222094B1 (en) Blowout preventer system with three control pods
US5040607A (en) Production system for subsea oil wells
CA2360966A1 (en) System with a compliant guide and method for inserting a coiled tubing into an oil well
US4375835A (en) Oil production system
US4211281A (en) Articulated plural well deep water production system
GB2228281A (en) Diversionary spool assembly for oil and gas wells
US4589493A (en) Subsea wellhead production apparatus with a retrievable subsea choke
GB2051500A (en) Electrical connector
AU2012268839A1 (en) Vertical subsea tree assembly control
GB1399028A (en) Well-head assembly
US4494602A (en) Electrical connection device for an underwater well head
GB2037347A (en) Subsea cluster well production apparatus
US4223920A (en) Vertically retrievable subsea conduit connector
GB2121458A (en) Oil production system
US4442900A (en) Subsea well completion system
US4770247A (en) Subsea riser for multiple bore wells
US3233666A (en) Underwater wellhead with remotelydetachable flow line
EP0510778B1 (en) Wellhead structure
GB1163336A (en) Subsea Fluid Mineral Production Satellite System
US5161620A (en) Subsea production wellhead assembly
US3498374A (en) Underwater safety connector
US3285337A (en) Well drilling method

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)