GB1447993A – Low flow safety valve apparatus
– Google Patents
GB1447993A – Low flow safety valve apparatus
– Google Patents
Low flow safety valve apparatus
Info
Publication number
GB1447993A
GB1447993A
GB5017273A
GB5017273A
GB1447993A
GB 1447993 A
GB1447993 A
GB 1447993A
GB 5017273 A
GB5017273 A
GB 5017273A
GB 5017273 A
GB5017273 A
GB 5017273A
GB 1447993 A
GB1447993 A
GB 1447993A
Authority
GB
United Kingdom
Prior art keywords
mandrel
piston
shoulder
spring
choke
Prior art date
1972-10-31
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
Application number
GB5017273A
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.)
Schlumberger Technology Corp
Original Assignee
Schlumberger Technology Corp
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.)
1972-10-31
Filing date
1973-10-29
Publication date
1976-09-02
1973-10-29
Application filed by Schlumberger Technology Corp
filed
Critical
Schlumberger Technology Corp
1976-09-02
Publication of GB1447993A
publication
Critical
patent/GB1447993A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
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
E21B34/00—Valve arrangements for boreholes or wells
E21B34/06—Valve arrangements for boreholes or wells in wells
E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
Y10T137/00—Fluid handling
Y10T137/7722—Line condition change responsive valves
Y10T137/7723—Safety cut-off requiring reset
Y10T137/7726—Responsive to change in rate of flow
Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
Y10T137/00—Fluid handling
Y10T137/7722—Line condition change responsive valves
Y10T137/7723—Safety cut-off requiring reset
Y10T137/7731—Fluid counter-biased or unseated valve
Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
Y10T137/00—Fluid handling
Y10T137/7722—Line condition change responsive valves
Y10T137/7723—Safety cut-off requiring reset
Y10T137/7731—Fluid counter-biased or unseated valve
Y10T137/7733—With fluid pressure seating of valve
Abstract
1447993 Valves SCHLUMBERGER TECHNOLOGY CORP 29 Oct 1973 [31 Oct 1972] 50172/73 Heading F2V [Also in Division E1] A downhole low flow well safety valve includes a throughflow mandrel 86 carrying a closure head 116 co-operable with a fixed seat 124, the mandrel being maintained in an upper flow-permitting position while the pressuredrop across a choke beam 138 is sufficient to overcome the bias of spring 98. When the flow rate falls to a predetermined value, e.g. upon closure of a separate safety valve in response to excess flow, the spring depresses the mandrel and the closure head engages a PTFE seal ring 128 at 120 and a metal disc 130 at 122, the closure head in this position presenting a net effective area on which the bottomhole pressure acts to hold the mandrel in its closed position. To re-open the valve, the production string is pressurized to depress a piston 146 to a position in which spring fingers 152 are forced radially into groove 156 in the mandrel by entry of projections 158 into a constricted portion 162 of the housing, the piston in its depressed position abutting the mandrel at 168. The production string pressure is then lowered and the bottomhole pressure eventually becomes effective to raise the piston which is accompanied by the mandrel due to the fingers engaging the shoulder 170. When the projections 158 move above shoulder 160, the fingers expand out of the groove under their own resilience and due to interaction of their ends 155 with the shoulder 170, and the piston eventually abuts shoulder 164. At this stage, the flow rate is unlikely to have reached a value sufficient to produce a pressure drop across the choke beam capable of resisting the force of the spring, and so the mandrel will be depressed but is prevented from reaching a fully-closed position by entry of pin 172 into the choke beam, the consequent increase in the pressure drop across the beam kicking the mandrel back upwards. This cycling of the mandrel continues with decreasing amplitude until the flow rate is restored to its normal value. The upper end of the mandrel carries a tubular element 104 which receives a sleeve 110 depending from sub 58 and defines therewith a dead space to prevent sand from settling on the piston.
GB5017273A
1972-10-31
1973-10-29
Low flow safety valve apparatus
Expired
GB1447993A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US00302545A
US3848629A
(en)
1972-10-31
1972-10-31
Low flow safety valve with pressure lock
Publications (1)
Publication Number
Publication Date
GB1447993A
true
GB1447993A
(en)
1976-09-02
Family
ID=23168208
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB5017273A
Expired
GB1447993A
(en)
1972-10-31
1973-10-29
Low flow safety valve apparatus
Country Status (5)
Country
Link
US
(1)
US3848629A
(en)
CA
(1)
CA991077A
(en)
DE
(1)
DE2354275A1
(en)
FR
(1)
FR2204768B1
(en)
GB
(1)
GB1447993A
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2163794A
(en)
*
1984-08-29
1986-03-05
Camco Inc
Fluid level controlled safety valve
US7740075B2
(en)
2008-07-09
2010-06-22
Schlumberger Technology Corporation
Pressure relief actuated valves
Families Citing this family (7)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4204513A
(en)
*
1978-11-15
1980-05-27
California Controls Company
Hydraulic safety mechanism
US4266614A
(en)
*
1979-07-12
1981-05-12
Otis Engineering Corporation
Valve
US8002040B2
(en)
*
2008-04-23
2011-08-23
Schlumberger Technology Corporation
System and method for controlling flow in a wellbore
US8733474B2
(en)
*
2011-01-14
2014-05-27
Schlumberger Technology Corporation
Flow control diverter valve
CN103061707B
(en)
*
2011-10-21
2015-07-22
中国石油天然气股份有限公司
Cycling switch valve under well
NO339640B1
(en)
*
2013-10-30
2017-01-16
Wellbore As
Downhole device designed to form a pipe string
CN112013140B
(en)
*
2020-08-28
2022-04-29
大庆烯城炟石油技术开发有限公司
Be applied to relief valve on air compressor machine
Family Cites Families (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3452777A
(en)
*
1964-08-24
1969-07-01
William W Dollison
Pressure-responsive safety valve
US3477507A
(en)
*
1967-06-13
1969-11-11
Cook Testing Co
Well safety valve
US3642070A
(en)
*
1970-05-06
1972-02-15
Otis Eng Co
Safety valve system for gas light wells
US3724493A
(en)
*
1971-04-28
1973-04-03
Schlumberger Technology Corp
Low flow safety valve
1972
1972-10-31
US
US00302545A
patent/US3848629A/en
not_active
Expired – Lifetime
1973
1973-10-26
CA
CA184,292A
patent/CA991077A/en
not_active
Expired
1973-10-29
FR
FR7338420A
patent/FR2204768B1/fr
not_active
Expired
1973-10-29
GB
GB5017273A
patent/GB1447993A/en
not_active
Expired
1973-10-30
DE
DE19732354275
patent/DE2354275A1/en
not_active
Withdrawn
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2163794A
(en)
*
1984-08-29
1986-03-05
Camco Inc
Fluid level controlled safety valve
US7740075B2
(en)
2008-07-09
2010-06-22
Schlumberger Technology Corporation
Pressure relief actuated valves
Also Published As
Publication number
Publication date
FR2204768A1
(en)
1974-05-24
DE2354275A1
(en)
1974-05-09
US3848629A
(en)
1974-11-19
FR2204768B1
(en)
1977-03-11
CA991077A
(en)
1976-06-15
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Legal Events
Date
Code
Title
Description
1977-01-13
PS
Patent sealed [section 19, patents act 1949]
1987-06-17
PCNP
Patent ceased through non-payment of renewal fee
