US3741295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Replacement of sub sea blow out preventer packing units
Assignee: Hydril LLC
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Filing: 1971-06-14
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Granted: 1973-06-26
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Expires: 1991-06-14
Abstract
Abstract Apparatus and method to enable well blow-out preventer packer replacement at a sub-sea well head location.
Inventors
- 👤 F Murman
- 👤 G Lewis
- 👤 A Dunn
- 👤 Brien C O
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:23
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/064; E21B33/035
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
187 words
In well blow-out preventer apparatus, the combination comprising a. an annular body adapted to pass well equipment, b. a fluid pressure responsive packer actuator movable in the body, c. an annular packer received downwardly in the body and supported for generally radial construction and expansion in response to said actuator movement, d. hold-down means carried to block upward displacement of the packer in response to movement of the actuator, e. other means for effecting locking of the hold-down means to the body and unlocking thereof to permit upward removal of the hold-down means from the body followed by withdrawal of the packer therefrom, f. said hold-down means having telescopic interfit with said body, and said other means including latch structure carried by the hold-down means for movement into and out of locking position relative to said body, and g. said other means including a fluid pressure responsive member carried by said hold-down means for movement in one direction to urge said latch structure into said locking position, and for movement in the opposite direction to allow lateral movement of the latch structure out of said locking position.
Claim 2
Dependent Claim
187 words
In well blow-out preventer apparatus, the combination comprising a. an annular body adapted to pass well equipment, b. a fluid pressure responsive packer actuator movable in the body, c. an annular packer received downwardly in the body and supported for generally radial construction and expansion in response to said actuator movement, d. hold-down means carried to block upward displacement of the packer in response to movement of the actuator, e. other means for effecting locking of the hold-down means to the body and unlocking thereof to permit upward removal of the hold-down means from the body followed by withdrawal of the packer therefrom, f. said hold-down means having telescopic interfit with said body, and said other means including latch structure carried by the hold-down means for movement into and out of locking position relative to said body, and g. said other means including a fluid pressure responsive member carried by said hold-down means for movement in one direction to urge said latch structure into said locking position, and for movement in the opposite direction to allow lateral movement of the latch structure out of said locking position.
Claim 3
Dependent Claim
30 words
The combination of claim 1 wherein said latch structure includes a circular series of latch dogs received downwardly within said body on an annular insert portion of said hold-down means.
Claim 4
Dependent Claim
50 words
The combination of claim 2 wherein the lower terminal of said annular insert portion of said hold-down means provides a stop against which the upper surface of the packer is engageable, said packer including an elastomeric body and metallic inserts carried thereby and having upper plates defining said upper surface.
Claim 5
Dependent Claim
24 words
The combination of claim 1 including a sub-sea well head stack mounting said body, and a tubular riser extending upwardly from said hold-down means.
Claim 6
Dependent Claim
40 words
The combination of claim 4 wherein said riser has connection to said hold-down means for elevating said hold-down means relative to said body and to a position in which said packer is upwardly openly exposed for removal from the body.
Claim 7
Dependent Claim
182 words
In well blow-out preventer apparatus, the combination comprising a. an annular body adapted to pass well equipment, b. a fluid pressure responsive packer actuator movable in the body, c. an annular packer received downwardly in the body and supported for generally radial constriction and expansion in response to actuator movement, d. hold-down means carried to block upward displacement of the packer in response to movement of the actuator, e. other means for effecting locking of the hold-down means to the body and unlocking thereof to permit upward removal of the hold-down means from the body followed by withdrawal of the packer therefrom, and f. a sub-sea well head stack mounting said body, and a tubular riser extending upwardly from said hold-down means, said riser having connection to said hold-down means for elevating said hold-down means relative to said body and to a position in which said packer is upwardly openly exposed for removal from the body, and said riser connection to the hold-down means comprising a ball and socket, the ball defining a vertical passage above an opening defined by the packer.
Claim 8
Dependent Claim
182 words
In well blow-out preventer apparatus, the combination comprising a. an annular body adapted to pass well equipment, b. a fluid pressure responsive packer actuator movable in the body, c. an annular packer received downwardly in the body and supported for generally radial constriction and expansion in response to actuator movement, d. hold-down means carried to block upward displacement of the packer in response to movement of the actuator, e. other means for effecting locking of the hold-down means to the body and unlocking thereof to permit upward removal of the hold-down means from the body followed by withdrawal of the packer therefrom, and f. a sub-sea well head stack mounting said body, and a tubular riser extending upwardly from said hold-down means, said riser having connection to said hold-down means for elevating said hold-down means relative to said body and to a position in which said packer is upwardly openly exposed for removal from the body, and said riser connection to the hold-down means comprising a ball and socket, the ball defining a vertical passage above an opening defined by the packer.
Claim 9
Dependent Claim
39 words
The combination of claim 6 wherein said hold-down means has telescopic interfit with said body, and said other means includes latch structure carried by the hold-down means for movement into and out of locking position relative to said body.
Claim 10
Dependent Claim
54 words
The combination of claim 7 wherein said other means includes a fluid pressure responsive member carried by said hold-down means for movement in one direction to urge said latch structure into said locking position, and for movement in the opposite direction to allow lateral movement of the latch structure out of said locking position.
Claim 11
Dependent Claim
44 words
The combination of claim 6 including packer retrieval means located generally laterally of said body and riser and having a part bodily movable laterally and downWardly into said body for lifting the packer therefrom after preliminary elevation of the hold-down means by said riser.
Claim 12
Dependent Claim
11 words
The combination of claim 9 wherein said part comprises an electromagnet.
Claim 13
Dependent Claim
36 words
The combination of claim 9 wherein said part comprises a plug downwardly insertible into a central opening defined by the packer, and including a lifting element carried by the plug for movement into packer lifting position.
Claim 14
Dependent Claim
28 words
The combination of claim 9 including vertically extending guy wires to which the packer retrieval means has guided connection for elevation and lowering thereof relative to the stack.
Claim 15
Dependent Claim
80 words
The combination of claim 9 wherein said packer retrieval means includes a carrier that is vertically movable relative to the stack, and an arm operatively connected to the carrier and supporting said part for said bodily movement between lowered position in which said part projects within said annular body for operative connection to the packer, and raised position in which said part and the packer are laterally offset from the stack for elevation by the carrier to the sea surface.
Claim 16
Dependent Claim
39 words
The combination of claim 13 wherein said arm has pivotal connection to the carrier, and including locating means for locating the carrier in predetermined relation to the stack in response to lowering of the carrier laterally of the stack.
Claim 17
Dependent Claim
41 words
The combination of claim 14 including retention means on the carrier to interfit the packer in raised position thereof and in response to elevation of the carrier, for positive retention of the packer on the carrier during elevation to the surface.
Claim 18
Dependent Claim
27 words
The combination of claim 15 wherein said retention means comprises a plug sized to upwardly penetrate the central passage formed by the packer in said raised position.
Claim 19
Dependent Claim
71 words
The combination of claim 15 wherein said carrier comprises a first section connected to said retention means, and a second section to which the arm has said pivotal connection, the second section being movable vertically relative to said first section to effect said interfit of the retention means with the packer in response to initial elevation of the carrier relative to a portion of said locating means attached to the stack.
Claim 20
Dependent Claim
14 words
The combination of claim 13 wherein said part is pivotally suspended from said arm.
Claim 21
Dependent Claim
29 words
The combination of claim 13 including an actuator on the carrier and operable to displace said arm between positions corresponding to said raised and lowered positions of said part.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |