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GB2478107A - Sub Surface Safety Valve - Google Patents

Sub Surface Safety Valve Download PDF

Info

Publication number
GB2478107A
GB2478107A GB0920976A GB0920976A GB2478107A GB 2478107 A GB2478107 A GB 2478107A GB 0920976 A GB0920976 A GB 0920976A GB 0920976 A GB0920976 A GB 0920976A GB 2478107 A GB2478107 A GB 2478107A
Authority
GB
United Kingdom
Prior art keywords
safety valve
sub surface
surface safety
power cable
packer
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.)
Granted
Application number
GB0920976A
Other versions
GB0920976D0 (en
GB2478107B (en
Inventor
Philip Head
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.)
Artificial Lift Co Ltd
Original Assignee
Artificial Lift Co Ltd
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 Artificial Lift Co Ltd filed Critical Artificial Lift Co Ltd
Priority to GB0920976.8A priority Critical patent/GB2478107B/en
Publication of GB0920976D0 publication Critical patent/GB0920976D0/en
Publication of GB2478107A publication Critical patent/GB2478107A/en
Application granted granted Critical
Publication of GB2478107B publication Critical patent/GB2478107B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • E21B34/10Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
    • E21B34/105Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole retrievable, e.g. wire line retrievable, i.e. with an element which can be landed into a landing-nipple provided with a passage for control fluid
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/122Multiple string packers
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B2200/00Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/05Flapper valves

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)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

A sub surface safety valve assembly 10 includes a subsurface safety valve 12, a packer 14 for sealing the valve in a wellbore, a supporting electric cable 16 and connectors which bypass the valve 36 (37, 38 fig 2). A lower cable hangs from the packer 14 and may be configured to support a tool. The upper cable and lower cable are connected to the by-pass connectors 36 which may be metal tubes which pass through and are sealed against the packer 14.

Description

Sub surface Safety Valve This invention relates to Sub snrfaee Safety Valves that can be deployed in a well bore.
Sub Surface Safety Valves (SSSVs) are provided in well bores to close the production tubing and prevent production fluid rising in the event of an emergency. They are typically provided with male and female threads at either end and incorporated into the completion string. If the SSSV malfunctions, a workover is required to replace the completion string.
SSSVs can also be deployed on a retrievable wireline. Any tools deployed in the completion bore must be retrieved before the wireline retreivable SSSV is deployed.
It is an objective of this invention to be able to provide a SSSV system which reduces the disadvantages of the above systems.
According to the present invention, there is provided a sub surface safety valve in a well system comprising an upper support means a sub surface safety valve a sealing means that seals against the inside of the production path and a bore through the sub surface safety valve and sealing means which connects to an annular inlet beneath the sealing means and an annular outlet above the sub surface safety valve.
The following figures will be used to describe embodiments of the invention.
Figure 1 is a side view of a section of the well from surface to total depth, showing the S S SV, and Figure 2 is a cross sectional view of the SSSV and casing.
Referring to figure 1, an SSSV assembly 10 comprises an SSSV 12, a packer 14, and a power cable 16. The power cable is suitable for three phase power, and comprises three steel core strands each having a copper cladding, bound in insulating layers, as described in copending application PCT/GB2009/O5 1535.
The steel core is of the power cable 16 of a sufficient diameter to support both the power cable's own right, and that of the SSSV assembly 10, whilst the copper cladding is sufficiently thick to carry a high voltage.
The end of the power cable 16 is attached to a upper connector 18, where the copper cladding portions of the about conductive contacts in the upper connector, and the steel cores of the power cable are secured to a gripping elements incorporated in the a upper connector 18. A hydraulic line (not here shown) to control the SSSV 12 is banded along the length of the power line 16, and extends past the connector 18 to the SSSV itself The a upper connector 18 is in turn connected to an upper outlet section 22.
The SSSV assembly 10 has a central bore 30 running most of the length of the assembly. Part of the bore 30 is included in outlet section 22, and is in fluid communication with the annulas above the packer 14 via a outlet 23.
The SSSV 12 is attached to the lower end of the outlet section 22. The bore 30 extends through the whole length of the SSSV 12. The SSSV 12 includes a flapper valve 32 held by a spring 31 as is known in the art.
The lower end of the SSSV 12 is attached to a packer 14. The packer 14 includes energisable seals 34 which seal against the inner surface of the well easing 20. The bore 30 also extends along the packer 14, and is in fluid communication with the annulas below the packer 14 via a inlets 33 situated at the bottom of the packer.
A lower connector 26 is attached to the bottom of the packer 14. The lower connector has a similar cable termination to the upper connector, with a three strand steel core, copper clad, cable 17 hanging from the lower connector and having mechanical and electrical connection with the cable conductors in the same maimer as the upper connector 18. The upper connector 18 and the lower connector 26 have bulk heads 19 and 17 respectively, which radially protrude from the central axis of the SSSV assembly 10. Referring also to figure 2, steel tubes 36, 37, 38 extend from the bulkhead 19, past the upper outlet section 22 and SSSV 12, and down through the wall of the packer 14, emerging below the packer to enter the bulkhead 17. The steel tubes 36, 37, 38 are sealed against well fluids at the bulkhead, and may conveniently extend through the upper connector 18 and lower connector 26 to near the region the cables 16 and 17 respectively terminate with the connectors. The conductive contacts of the upper and lower connectors 18, 26 connect with conductors that extend through the length of the steel tubes 36, 37, 38.
The SSSV assembly 10 is deployed in the casing 20 by being lowered to cable 16 until the SSSV 14 is in the desired position. The packer 14 is then activated, either automatically, or for example by a control signal from the surface through a decated control line, or a signal multiplexed on the SSSV control line. During normal production, well fluids may flow up through the packer inlets 33, along the bore 30 through the packer 14, SSSV 12 and the upper outlet section 22. before flowing through the outlets 23, and thence flowing up through the well casing 20.
Activation of the SSSV 12 causes flapper valve 32 to close, which prevents any flow past the SSSV assembly 10.
The lower cable 17, like the upper cable 16, is strong enough to support its own weight, and to additionally support tools, and is sufficiently conductive to carry a high voltage. This means that the SSSV assembly 10 may be installed in a well together with for example an electric submersible pump, powered by and suspended via cables 16 and 17. Deploying an SSSV assembly together with a tool allows much greater functionality, and dispensinses with having to remove a tool deployed without an SSSV in order to separately deploy an S S SV.

Claims (6)

  1. Claims 1. A sub surface safety valve in a well system comprising an upper support means a sub surface safety valve a sealing means that seals against the inside of the production path and a bore through the sub surface safety valve and sealing means which connects to an annular inlet beneath the sealing means and an annular outlet above the sub surface safety valve.
  2. 2. A sub surface safety valve system according to the previous claim wherein a lower power cable hangs from the packer down the well, the lower power cable being conductively connected to the upper power connector.
  3. 3. A sub surface safety valve system according to either previous claim wherein the lower power cable includes a support means.
  4. 4. A sub surface safety valve system according to any previous claim wherein the upper power cable includes conductors that also provide the support means.
  5. 5. A sub surface safety valve system according to any previous claim wherein the lower power cable includes conductors that also provide the support means.
  6. 6. A sub surface safety valve system according to any of claims 2 to 5 wherein the upper power cable and lower power cable are connected via at least one metal tube that passes through and is sealed against the packer.
GB0920976.8A 2009-12-01 2009-12-01 Sub surface safety valve Expired - Fee Related GB2478107B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0920976.8A GB2478107B (en) 2009-12-01 2009-12-01 Sub surface safety valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0920976.8A GB2478107B (en) 2009-12-01 2009-12-01 Sub surface safety valve

Publications (3)

Publication Number Publication Date
GB0920976D0 GB0920976D0 (en) 2010-01-13
GB2478107A true GB2478107A (en) 2011-08-31
GB2478107B GB2478107B (en) 2012-10-10

Family

ID=41572929

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0920976.8A Expired - Fee Related GB2478107B (en) 2009-12-01 2009-12-01 Sub surface safety valve

Country Status (1)

Country Link
GB (1) GB2478107B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276937A (en) * 1979-02-07 1981-07-07 Otis Engineering Corporation Well safety system
GB2173235A (en) * 1985-04-01 1986-10-08 Camco Inc Redundant safety valve system and method
US20080164035A1 (en) * 2004-10-07 2008-07-10 Bj Services Company Downhole Safety Valve Apparatus and Method
US20080210438A1 (en) * 2004-09-20 2008-09-04 Bj Services Company Downhole Safety Valve Apparatus and Method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276937A (en) * 1979-02-07 1981-07-07 Otis Engineering Corporation Well safety system
GB2173235A (en) * 1985-04-01 1986-10-08 Camco Inc Redundant safety valve system and method
US20080210438A1 (en) * 2004-09-20 2008-09-04 Bj Services Company Downhole Safety Valve Apparatus and Method
US20080164035A1 (en) * 2004-10-07 2008-07-10 Bj Services Company Downhole Safety Valve Apparatus and Method

Also Published As

Publication number Publication date
GB0920976D0 (en) 2010-01-13
GB2478107B (en) 2012-10-10

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Legal Events

Date Code Title Description
AT Applications terminated before publication under section 16(1)
S20A Reinstatement of application (sect. 20a/patents act 1977)

Free format text: REQUEST FOR REINSTATEMENT ALLOWED

Effective date: 20110525

Free format text: REQUEST FOR REINSTATEMENT FILED

Effective date: 20110505

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20131201