Patent US3844346A successfully refreshed from Google Patents.
US3844346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsurface safety valve well tool operable by differential annular pressure
Assignee: Hydril LLC
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Filing: 1973-05-14
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Granted: 1974-10-29
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Expires: 1993-05-14
Abstract
Abstract A well tool apparatus adapted for connection in a production tubing including a separable flow housing having a bore extending therethrough with a rotatable ball bore closure means positioned in said bore which is operable in response to differential fluid pressure in an annular area about the tubing and a means for releasably securing the separable portions of the housing for effecting housing separation by either a directional fluid pressure or mechanical movement to enable retrieval of the rotatable ball.
Inventors
- 👤 J Mott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:44
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B34/105; E21B2200/00; E21B2200/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
174 words
A well tool adapted for connection in a production tubing including: a. a flow housing having a bore formed therethrough and comprising a first housing portion and a second housing portion, said housing adapted for connection in the production tubing to form a portion thereof with said bore in communication with a flow passage of the production tubing for enabling flow of fluid through said bore; b. bore closure means mounted with said flow housing for movement in said bore to and from an open position for enabling flow fluid through said bore and to and from a closed position for blocking flow of fluid through said bore; and c. means with said flow housing for releasably securing said first housing portion of said flow housing with said second housing portion of said flow housing, said means for releasably securing comprising means moving in response to a predetermined directional fluid pressure thereon to release said second housing portion from said first housing portion to enable removal of said bore closure means from the well.
Claim 2
Dependent Claim
174 words
A well tool adapted for connection in a production tubing including: a. a flow housing having a bore formed therethrough and comprising a first housing portion and a second housing portion, said housing adapted for connection in the production tubing to form a portion thereof with said bore in communication with a flow passage of the production tubing for enabling flow of fluid through said bore; b. bore closure means mounted with said flow housing for movement in said bore to and from an open position for enabling flow fluid through said bore and to and from a closed position for blocking flow of fluid through said bore; and c. means with said flow housing for releasably securing said first housing portion of said flow housing with said second housing portion of said flow housing, said means for releasably securing comprising means moving in response to a predetermined directional fluid pressure thereon to release said second housing portion from said first housing portion to enable removal of said bore closure means from the well.
Claim 3
Dependent Claim
48 words
The invention as set forth in claim 1, wherein: said means releasably securing said first housing portion of said flow housing with said second housing portion of said flow housing includes means responsive to a predetermined directional fluid pressure thereon to separate said first and second housing portions.
Claim 4
Dependent Claim
50 words
The invention as set forth in claim 1, wherein: said means for releasably securing said first housing portion of said flow housing with said second housing portion of said flow housing inclues means responsive to a mechanical manipulation imparted to said housing to separate said first and second housing portions.
Claim 5
Dependent Claim
62 words
The invention as set forth in claim 1, wherein: said means for releasably securing said first housing portion of said flow housing with said second housing portion of said flow housing includes means selectively operable to separate said first and second housing portions in response to either the urging of a predetermined directional fluid pressure or a mechanical manipulation of said housing.
Claim 6
Dependent Claim
134 words
The invention as set forth in claim 1, wherein said means for releasably securing said first housing portion of said flow housing with said second housing portion of said flow housing includes: a. a latch dog mounted with said flow housing and movable to and from a locking position for securing said first housing portion with said second housing portion and to and from a free position for releasing said first housing portion from said second housing portion; and b. a lock member mounted with said flow housing and movable to and from a first position for moving said latch dogs to the locking position in response to the urging of a predetermined directional fluid pressure and to and from a second position for enabling said latch dogs to move to the free position.
Claim 7
Dependent Claim
49 words
The invention as set forth in claim 5, wherein: said latch dog moves radially outwardly relative to the longitudinal axis of said flow housing in moving from the free position to the locking position wherein said first portion and said second housing portion of said flow housing are secured.
Claim 8
Dependent Claim
55 words
The invention as set forth in claim 5, wherein the apparatus is adapted for use in a well casing having a surface forming a downwardly facing shoulder and wherein: said latch dog has a surface which moves into engagement with the shoulder when moving to the locking position wherein said flow housing is releasably secured.
Claim 9
Dependent Claim
35 words
The invention as set forth in claim 5, including: a plurality of latch dogs mounted with said flow housing and simultaneously movable to and from the locking position and to and from the free position.
Claim 10
Dependent Claim
88 words
The invention as set forth in claim 5, including: a. means with said first housing portion of said flow housing for mounting said flow housing with a well casing at a subsurface location for supporting said flow housing in the well; and b. said bore closure means mounted with said second housing portion of said flow housing to enable removal of said bore closure means from the well when said second housing portion of said flow housing is released from said first housing portion of said flow housing.
Claim 11
Dependent Claim
62 words
The invention as set forth in claim 1, wherein: said bore closure means includes a ball member having a flow port formed therethrough which is rotated to and from the open position enabling flow of fluid through said flow port and to and from the closed position where said ball member blocks flow of fluid through said bore of said flow housing.
Claim 12
Dependent Claim
49 words
The invention as set forth in claim 1, including: means with said flow housing for effecting movement of said bore closure means to and from the open and closed position in response to a fluid pressure differential in an annular area between the production tubing and the well casing.
Claim 13
Dependent Claim
31 words
The invention as set forth in claim 1, including: means with said flow housing for locking said bore closure means in the open position in response to a directional fluid pressure.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |