Patent US3797366A successfully refreshed from Google Patents.
US3797366A
Expired / Lapsed
US
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Telescopic hydraulic decelerator
Assignee: Vetco Inc
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Filing: 1972-07-14
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Granted: 1974-03-19
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Expires: 1992-07-14
Abstract
Abstract A hydraulic decelerator, particularly useful in a compensator apparatus connected between a travelling block of a well bore rig, mounted on a vessel floating in a body of water, and a hook from which a running string is supported, including a plurality of telescopic sleeves associated with the piston portion of the compensator apparatus and disposed within a companion compensator cylinder, the sleeve having ports or orifices through which hydraulic fluid in the cylinder is forced as the sleeves progressively collapse one within the other during movement of the piston portion within the cylinder, to gradually decelerate over-rapid movement of the piston portion of the compensator apparatus to a desired speed.
Inventors
- 👤 J Hanes
- 👤 E Larralde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:44
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/09; F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/16
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
170 words
In deceleration apparatus: a cylinder having a main passage through which fluid under pressure can flow into and from said cylinder; a piston slidable relatively in said cylinder and adapted to be acted upon by the fluid under pressure in said cylinder; a piston rod fixed to said piston and extending through a piston rod end of said cylinder in slidable sealed relation thereto; and deceleration means in said cylinder surrounding said piston rod and carried by said piston and movable with said piston and rod relative to said cylinder, said deceleration means comprising sleeve means movable with respect to said piston and rod and engageable with said piston rod end of said cylinder upon movement of said piston toward said piston rod end of said cylinder, said sleeve means having a restricted flow passage through which said piston forces fluid in said cylinder after said sleeve means engages said piston rod end of said cylinder and said piston continues its movement toward said piston rod end of said cylinder.
Claim 2
Dependent Claim
170 words
In deceleration apparatus: a cylinder having a main passage through which fluid under pressure can flow into and from said cylinder; a piston slidable relatively in said cylinder and adapted to be acted upon by the fluid under pressure in said cylinder; a piston rod fixed to said piston and extending through a piston rod end of said cylinder in slidable sealed relation thereto; and deceleration means in said cylinder surrounding said piston rod and carried by said piston and movable with said piston and rod relative to said cylinder, said deceleration means comprising sleeve means movable with respect to said piston and rod and engageable with said piston rod end of said cylinder upon movement of said piston toward said piston rod end of said cylinder, said sleeve means having a restricted flow passage through which said piston forces fluid in said cylinder after said sleeve means engages said piston rod end of said cylinder and said piston continues its movement toward said piston rod end of said cylinder.
Claim 3
Dependent Claim
33 words
In apparatus as defined in claim 1; said restricted flow passage communicating with said main passage and having an effective fluid passage area substantially less than the effective area of said main passage.
Claim 4
Dependent Claim
79 words
In apparatus as defined in claim 1; said piston having a head and a skirt; said sleeve means including a sleeve normally supported by and telescoped within said skirt for movement toward said head, said sleeve having said restricted flow passage, whereby engagement of said sleeve with said piston rod end of said cylinder end relatively shifts said sleeve within said skirt toward said piston head and forces fluid within said skirt and sleeve through said restricted flow passage.
Claim 5
Dependent Claim
104 words
In apparatus as defined in claim 1; said piston having a head and a skirt; said sleeve means including a sleeve normally supported by and telescoped within said skirt for movement toward said head, said sleeve having said restricted flow passage, whereby engagement of said sleeve with said piston rod end of said cylinder relatively shifts said sleeve within said skirt toward said piston head and forces fluid within said skirt and sleeve through said restricted flow passage; said restricted flow passage communicating with said main passage and having an effective fluid pressure area substantially less than the effective area of said main passage.
Claim 6
Dependent Claim
122 words
In apparatus as defined in claim 1, said piston having a head and a skirt; said sleeve means including a first sleeve normally supported by and telescoped within said skirt and a second sleeve normally supported by and telescoped within said first sleeve, said first and second sleeves being movable longitudinally of said piston rod and skirt toward said head, said first and second sleeves each having a restricted flow passage, whereby progressive stopping of said second sleeve and first sleeve by said piston rod end of said cylinder shifts said second sleeve relatively within saiD first sleeve and then said second sleeve and first sleeve within said skirt and forces fluid within said skirt and sleeves through said restricted flow passages.
Claim 7
Dependent Claim
179 words
In apparatus as defined in claim 1; said piston means having a head and a skirt; said sleeve means including a first sleeve normally supported by and telescoped within said skirt and a second sleeve normally supported by and telescoped within said first sleeve, said first and second sleeves being movable longitudinally of said piston rod and skirt toward said head, said first and second sleeves each having a restricted flow passage, whereby progressive stopping of said second sleeve and first sleeve by said piston rod end of said cylinder shifts said second sleeve relatively within said first sleeve and then said second sleeve and first sleeve within said skirt and forces fluid within said skirt and sleeves through said restricted flow passages; said restricted flow passages being communicable with said main passage and with each other, said second sleeve passage having an effective fluid pressure area substantially less than the effective area of said main passage, said first sleeve passage having an effective fluid pressure area substantially less than the effective fluid pressure area of said second sleeve.
Claim 8
Dependent Claim
253 words
In apparatus for maintaining a predetermined stress in a running string: a cylinder having a main passage through which fluid under pressure can flow into and from said cylinder; a piston slidable relatively in said cylinder and adapted to be acted upon by the fluid under pressure in said cylinder; a piston rod fixed to said piston and extending through the piston rod end of said cylinder in slidable sealed relation thereto; one of said cylinder and piston rod having a device connected thereto adapted for operative connection to the running string; the other of said cylinder and piston rod having a device connected thereto adapted for operative connection to a support; means for maintaining said fluid under substantially constant predetermined pressure on one side of said piston as said cylinder and said piston and rod move longitudinally relative to one another in both longitudinal directions; and deceleration means in said cylinder surrounding said piston rod and carried by said piston and movable with said piston and rod relative to said cylinder, said deceleration means comprising sleeve means movable with respect to said piston and rod and engageable with said piston rod end of said cylinder upon movement of said piston toward said piston rod end of said cylinder, said sleeve means having a restricted flow passage through which said piston forces said fluid in said cylinder after said sleeve means engages said piston rod end of said cylinder and said piston continues its movement toward said piston rod end of said cylinder.
Claim 9
Dependent Claim
253 words
In apparatus for maintaining a predetermined stress in a running string: a cylinder having a main passage through which fluid under pressure can flow into and from said cylinder; a piston slidable relatively in said cylinder and adapted to be acted upon by the fluid under pressure in said cylinder; a piston rod fixed to said piston and extending through the piston rod end of said cylinder in slidable sealed relation thereto; one of said cylinder and piston rod having a device connected thereto adapted for operative connection to the running string; the other of said cylinder and piston rod having a device connected thereto adapted for operative connection to a support; means for maintaining said fluid under substantially constant predetermined pressure on one side of said piston as said cylinder and said piston and rod move longitudinally relative to one another in both longitudinal directions; and deceleration means in said cylinder surrounding said piston rod and carried by said piston and movable with said piston and rod relative to said cylinder, said deceleration means comprising sleeve means movable with respect to said piston and rod and engageable with said piston rod end of said cylinder upon movement of said piston toward said piston rod end of said cylinder, said sleeve means having a restricted flow passage through which said piston forces said fluid in said cylinder after said sleeve means engages said piston rod end of said cylinder and said piston continues its movement toward said piston rod end of said cylinder.
Claim 10
Dependent Claim
33 words
In apparatus as defined in claim 7; said restricted flow passage communicating with said main passage and having an effective fluid passage area substantially less than the effective area of said main passage.
Claim 11
Dependent Claim
80 words
In apparatus as defined in claim 7; said piston having a head and a skirt; said sleeve means including a sleeve normally supported by and telescoped within said skirt for movement toward said head, said sleeve having said restricted flow passage, whereby engagement of said sleeve with said piston rod end of said cylinder relatively shifts said sleeve within said skirt toward said piston head and forces the fluid medium within said skirt and sleeve through said restricted flow passage.
Claim 12
Dependent Claim
105 words
In apparatus as defined in claim 7; said piston having a head and a skirt; said sleeves means including a sleeve normally supported by and telescoped within said skirt for movement toward said head, said sleeve having said restricted flow passage, whereby engagement of said sleeve with said piston rod end of said cylinder relatively shifts said sleeve within said skirt toward said piston head and forces the fluid medium within said skirt and sleeve throUgh said restricted flow passage; said flow passage communicating with said main passage and having an effective fluid passage area substantially less than the effective area of said main passage.
Claim 13
Dependent Claim
122 words
In apparatus as defined in claim 7; said piston having a head and a skirt; said sleeve means including a first sleeve normally supported by and telescoped within said skirt and a second sleeve normally supported by and telescoped within said first sleeve, said first and second sleeves being movable longitudinally of said piston rod and skirt toward said head, said first and second sleeves each having said restricted flow passage, whereby progressive stopping of said second sleeve and first sleeve by said piston rod end of said cylinder shifts said second sleeve within said first sleeve and then said first and second sleeves within said skirt and forces the fluid medium within said skirt and sleeves through said restricted flow passages.
Claim 14
Dependent Claim
173 words
In apparatus as defined in claim 7; said piston having a head and a skirt; said sleeve means including a first sleeve normally supported by and telescoped within said skirt and a second sleeve normally supported by and telescoped within said first sleeve, said first and second sleeves being movable longitudinally of said piston rod and skirt toward said head, said first and second sleeves each having said restricted flow passage, whereby progressive stopping of said second sleeve and first sleeve by said cylinder shifts said second sleeve within said first sleeve and then said first and second sleeves within said skirt and forces the fluid medium within said skirt and sleeves through said restricted flow passages; said restricted flow passages being communicable with said main passage and with each other, said second sleeve passage having an effective fluid passage area substantially less than the effective area of said main passage, said first sleeve passage having an effective fluid pressure area substantially less than the effective fluid pressure area of said second sleeve.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |