US3799258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsurface well safety valve
Assignee: CAMCO INC US
•
Filing: 1971-11-19
•
Granted: 1974-03-26
•
Expires: 1991-11-19
Abstract
Abstract A subsurface well safety valve for connection directly into a well tubing for shutting off flow of well fluids through the tubing when adverse well conditions occur, but yet providing a valve bore of substantially the same size as the bore of the well tubing for allowing unrestricted passage of well equipment. The valve bore of the safety valve including means for supporting a second safety valve in the event that the first safety valve becomes inoperative. A fluid control line extending from the surface to the first safety valve which valve includes a port communicating with the control line and opening into the valve bore with shearable means initially closing the port but when sheared communicating control fluid into the first valve bore for controlling a second safety valve supported in the first valve bore.
Inventors
- 👤 G Tausch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:30
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B34/105; E21B34/106; E21B2200/00; E21B2200/05; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
184 words
In a fluid controlled safety valve for use in a well tubing and having a valve element and seat for controlling the fluid flow through the valve bore and tubing and yieldable means biasing said valve in a direction to close, and a fluid control line extending to the surface for supplying a fluid acting on the valve in a direction to open said valve, the improvement comprising, connecting means on each end of the safety valve for connecting the valve in a well tubing, the bore of the valve being of a size substantially as great as the bore of the well tubing thereby avoiding restricting the well tubing bore when the valve is open, said valve bore including means for supporting a second safety valve in said first valve bore, said first valve having a port in communication with the control fluid for the first valve and opening into the first valve bore, and means initially closing said port but openable for communicating control fluid into the first valve bore for controlling a second safety valve supported in the first valve bore.
Claim 2
Dependent Claim
184 words
In a fluid controlled safety valve for use in a well tubing and having a valve element and seat for controlling the fluid flow through the valve bore and tubing and yieldable means biasing said valve in a direction to close, and a fluid control line extending to the surface for supplying a fluid acting on the valve in a direction to open said valve, the improvement comprising, connecting means on each end of the safety valve for connecting the valve in a well tubing, the bore of the valve being of a size substantially as great as the bore of the well tubing thereby avoiding restricting the well tubing bore when the valve is open, said valve bore including means for supporting a second safety valve in said first valve bore, said first valve having a port in communication with the control fluid for the first valve and opening into the first valve bore, and means initially closing said port but openable for communicating control fluid into the first valve bore for controlling a second safety valve supported in the first valve bore.
Claim 3
Dependent Claim
30 words
The apparatus of claim 1 including a second safety valve supported in the first valve bore and positioned to contact and hold the first safety valve in the open position.
Claim 4
Dependent Claim
216 words
In a fluid controlled safety valve for use in a well tubing and having a valve element and seat for controlling the fluid flow through the valve bore and tubing with yieldable means biasing the valve in a direction to close, and a fluid control line extending to the surface for supplying a pressurized fluid acting on a piston in a direction to open the valve, the improvement comprising, threaded connecting means on each end of the safety valve for connecting the valve in a well tubing, the bore of the valve being of a size substantially as great as the bore of the well tubing thereby avoiding restricting flow therethrough when the valve is open, said valve bore including a recess for supporting a second safety valve in the first valve bore, said first valve bore including a sealing surface for coacting with an external seal means on the second valve, a port in the first valve in communication with the control fluid in the valve and opening into the first bore, shearable means initially closing said port, and a shearing sleeve in the first valve bore which when actuated shears the shearable means for supplying control fluid into the first valve bore for controlling a second safety valve positioned in the first valve bore.
Claim 5
Dependent Claim
216 words
In a fluid controlled safety valve for use in a well tubing and having a valve element and seat for controlling the fluid flow through the valve bore and tubing with yieldable means biasing the valve in a direction to close, and a fluid control line extending to the surface for supplying a pressurized fluid acting on a piston in a direction to open the valve, the improvement comprising, threaded connecting means on each end of the safety valve for connecting the valve in a well tubing, the bore of the valve being of a size substantially as great as the bore of the well tubing thereby avoiding restricting flow therethrough when the valve is open, said valve bore including a recess for supporting a second safety valve in the first valve bore, said first valve bore including a sealing surface for coacting with an external seal means on the second valve, a port in the first valve in communication with the control fluid in the valve and opening into the first bore, shearable means initially closing said port, and a shearing sleeve in the first valve bore which when actuated shears the shearable means for supplying control fluid into the first valve bore for controlling a second safety valve positioned in the first valve bore.
Claim 6
Dependent Claim
59 words
The apparatus of claim 3 including, a second safety valve supported in the first valve bore and including a piston which when actuated oPens said second valve, and seal means on said second safety valve sealing on the bore of the first safety valve for directing the control fluid from the port to the piston in the second valve.
Claim 7
Dependent Claim
30 words
The apparatus of claim 4 including, said second safety valve supported in the first valve bore and positioned to contact and hold the first safety valve in the open position.
References Cited (Backward Citations)
US3292706A
Cited
US3332497A
Cited
US3509913A
Cited
US3675720A
Cited
US3744564A
Cited
US3762471A
Cited
US3763933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |