US3783942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inside drilling tool blowout preventer
Assignee: Hydril LLC
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Filing: 1971-11-24
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Granted: 1974-01-08
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Expires: 1991-11-24
Abstract
Abstract A drilling tool connected in a drilling string includes a pressure responsive rotatable ball valve for enabling drilling fluid flow down the bore of a drill string which automatically rotates closed for blocking flow through the bore of the drill string when incipient pressure conditions indicate the direction of flow through the bore may be reversed. Means for releasably locking the ball in the open position in response to a preselected directional pressure to enable the running of other tools and the like through the bore of the drilling string are provided. The drilling tool may be employed for controlling an undesired flowing stream of fluid from the bore of the drilling string by stabbing the tool to connect with the drilling string utilizing a stabbing member which is removed after connecting to enable the ball valve to rotate closed to control the flowing stream.
Inventors
- 👤 J Mott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:34
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B34/00; E21B34/06; E21B34/08; E21B2200/00; E21B2200/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
160 words
A method of operating a safety valve connected in a well tubIng for controlling flow of fluid in an undesired direction through the bore of a well tubing, including the steps of: a. sensing the pressure in the bore of the well tubing for enabling flow in the desired direction through the bore; b. sensing the pressure adjacent the exterior of the safety valve; c. comparing the pressure in the bore with the pressure adjacent the exterior of the safety valve to determine the pressure differential; d. opening the safety valve to enable flow of fluid through the bore of the tubing when the pressure in the bore of the tubing exceeds the pressure adjacent the exterior of the safety valve by a predetermined value; and e. increasing the sensing of the pressure in the bore of the well tubing as the valve commences to open for increasing the urging opening the valve wherein said valve is moved fully open.
Claim 2
Independent Claim
160 words
A method of operating a safety valve connected in a well tubIng for controlling flow of fluid in an undesired direction through the bore of a well tubing, including the steps of: a. sensing the pressure in the bore of the well tubing for enabling flow in the desired direction through the bore; b. sensing the pressure adjacent the exterior of the safety valve; c. comparing the pressure in the bore with the pressure adjacent the exterior of the safety valve to determine the pressure differential; d. opening the safety valve to enable flow of fluid through the bore of the tubing when the pressure in the bore of the tubing exceeds the pressure adjacent the exterior of the safety valve by a predetermined value; and e. increasing the sensing of the pressure in the bore of the well tubing as the valve commences to open for increasing the urging opening the valve wherein said valve is moved fully open.
Claim 3
Dependent Claim
37 words
The method as set forth in claim 1, including the step of rotating a flow blocking member of the safety valve when opening the safety valve to enable flow of fluid through the bore of the tubing.
Claim 4
Dependent Claim
39 words
The method as set forth in claim 2, including the step of spacing the rotatable flow blocking portion of the safety valve from a safety valve seat prior to rotating open the flow blocking portion of the safety valve.
Claim 5
Dependent Claim
35 words
The method as set forth in claim 1, including the step of locking the opened safety valve to render the safety valve inoperative to control flow of fluid through the bore of a well tubing.
Claim 6
Dependent Claim
39 words
The method as set forth in claim 4, including the step of releasing the locked open safety valve to enable the safety valve to control flow of fluid in the undesired direction through the bore of the well tubing.
Claim 7
Dependent Claim
60 words
The method as set forth in claim 1, including the step of: closing the safety valve to block flow of fluid through the bore of the tubing when the pressure adjacent the exterior of the safety valve is exceeded by the pressure in the bore of the tubing by less than the predetermined value wherein the safety valve is operated.
Claim 8
Dependent Claim
32 words
The method as set forth in claim 6, including the step of: rotating a flow blocking member of the safety valve to control flow of fluid through the bore of the tubing.
Claim 9
Independent Claim
119 words
A method of controlling a flowing stream of fluid from a bore of a well tubing by stabbing a pressure responsive safety valve for stopping the stream including the steps of: a. locking the valve open to enable flow therethrough by securing a lock member with the valve; b. connecting the valve with the well tubing housing the stream of fluid flowing from the bore; c. removing the lock member to enable pressure responsive operation of the safety valve; and d. closing the valve to block the flow from the bore of the tubing when the pressure in the bore of the tubing exceeds the pressure adjacent the exterior of the safety valve by less than a predetermined value.
Claim 10
Independent Claim
119 words
A method of controlling a flowing stream of fluid from a bore of a well tubing by stabbing a pressure responsive safety valve for stopping the stream including the steps of: a. locking the valve open to enable flow therethrough by securing a lock member with the valve; b. connecting the valve with the well tubing housing the stream of fluid flowing from the bore; c. removing the lock member to enable pressure responsive operation of the safety valve; and d. closing the valve to block the flow from the bore of the tubing when the pressure in the bore of the tubing exceeds the pressure adjacent the exterior of the safety valve by less than a predetermined value.
Claim 11
Dependent Claim
24 words
The method as set forth in claim 8, including the step of rotating flow blocking member of the safety valve to close the valve.
Claim 12
Dependent Claim
30 words
The method as set forth in claim 9, including the step of: moving the flow blocking member of the safety valve along the bore when rotating to close the valve.
Claim 13
Dependent Claim
48 words
The method as set forth in claim 9, including the step of opening the valve to enable flow through the bore of the well tubing when the pressure in the bore of the tubing exceeds the pressure adjacent the exterior of the safety valve by a preselected pressure.
Claim 14
Dependent Claim
25 words
The method as set forth in claim 11, including the step of rotating the flow blocking member of the safety valve to open the valve.
Claim 15
Dependent Claim
30 words
The method as set forth in claim 12, including the step of: moving the flow blocking member of the safety valve along the bore when rotating to open the valve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |