US3777491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumping and servicing rig
Assignee: Individual
•
Filing: 1972-07-24
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Granted: 1973-12-11
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Expires: 1992-07-24
Abstract
Abstract An improved pumping rig for an oil well or the like having a 2 to 1 hydraulic powered lift assembly counterbalanced by a separate circuited hydropneumatic cushioning system and a reciprocatory movement control system using a third separate hydraulic circuit. The crown assembly includes a sheave and strap arrangement in place of unsatisfactory chains and sprockets. An internal safety bleed system is provided in the drive cylinder to create an hydraulic lock in the event of piston overtravel due to rod string failure or other malfunction. The hydropneumatic cushioning system includes vertical cylinders in fluid communication with air-hydraulic fluid surge tanks having slotted, anti-slosh tubes therein.
Inventors
- 👤 E Bender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:08
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/14; F04B47/02; F04B47/04; F15; F15B; F15B1/00; F15B1/26; F15B11/00; F15B11/02; F15B11/028; F15B11/036; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1466; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20538; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/315; F15B2211/3157; F15B2211/31576; F15B2211/32; F15B2211/329; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/71; F15B2211/77; F15B2211/7725
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
185 words
A well pumping rig comprising: a platform mounting a reciprocable lift device, hydropneumatic pressure counterbalancing means; and pumping means for providing compressed gas for said counterbalancing means; said reciprocable lift device including a centrally disposed vertically reciprocating lift member and lift line means operatively connected to tthe upper end of said reciprocating lift member, said hydropenumatic pressure counterbalancing means comprising a pair of hydraulic fluid filled cushion cylinders arranged adjacent said reciprocating lift member, a cushion piston rod extending upwardly from each of said cuShion cylinders and interconnected with said recoprocating lift member upper end, cushion pistons in each cushion cylinder beneath said cushion piston rods, and hydropneumatic tank means mounted in said platform and in fluid communication with said cushion cylinders beneath said cushion pistons, said hydropneumatic tank means comprising surge tank means partially filled with a nonemulsifying hydraulic fluid and partially with said compressed gas, said gas being supplied under pressure from said pumping means, and anti-slosh means in said surge tank means for preventing hydraulic fluid slosh during reciprocation of said reciprocating lift member and said cushion cylinder cushion rods and pistons.
Claim 2
Dependent Claim
185 words
A well pumping rig comprising: a platform mounting a reciprocable lift device, hydropneumatic pressure counterbalancing means; and pumping means for providing compressed gas for said counterbalancing means; said reciprocable lift device including a centrally disposed vertically reciprocating lift member and lift line means operatively connected to tthe upper end of said reciprocating lift member, said hydropenumatic pressure counterbalancing means comprising a pair of hydraulic fluid filled cushion cylinders arranged adjacent said reciprocating lift member, a cushion piston rod extending upwardly from each of said cuShion cylinders and interconnected with said recoprocating lift member upper end, cushion pistons in each cushion cylinder beneath said cushion piston rods, and hydropneumatic tank means mounted in said platform and in fluid communication with said cushion cylinders beneath said cushion pistons, said hydropneumatic tank means comprising surge tank means partially filled with a nonemulsifying hydraulic fluid and partially with said compressed gas, said gas being supplied under pressure from said pumping means, and anti-slosh means in said surge tank means for preventing hydraulic fluid slosh during reciprocation of said reciprocating lift member and said cushion cylinder cushion rods and pistons.
Claim 3
Dependent Claim
62 words
The rig as recited in claim 1 wherein said hydro-pneumatic tank means further comprises second surge tank means filled with compressed gas, manifold means interconnecting said surge tank means partially filled with hydraulic fluid and said second surge tank means, and an inlet line in fluid communication from said manifold to said pumping means for providing compressed gas for said counterbalancing means.
Claim 4
Dependent Claim
38 words
The rig as recited in claim 1 wherein each of said anti-slosh means comprises an elongated, relatively narrow diameter tube having spaced openings therealong, and a line communicating said anti-slosh tube to the base of a cushion cylinder.
Claim 5
Dependent Claim
34 words
The rig as recited in claim 3 wherein each anti-slosh tube spaced opening comprises means defining a narrow slot in the bottom of said tube, parallel to the long axis of said anti-slosh tube.
Claim 6
Dependent Claim
49 words
The rig as recited in claim 1 wherein each of said cushion cylinders, rods and pistons comprises a vertically disposed cylinder, a hollow, tubular cushion cylinder rod within said vertically disposed cylinder, and a free floating cushion piston, driving its cushion piston rod by abutting the lower end thereof.
Claim 7
Dependent Claim
35 words
The rig as recited in claim 5 wherein each cushion piston rod lower end includes an abutment plate having a convex contour arranged to contact said floating piston during upward movement by said floating piston.
Claim 8
Dependent Claim
34 words
The rig as recited in claim 5 wherein each cushion cylinder rod has an outside diameter less than the internal diameter of its cylinder, and includes a pair of anti-friction guide rings mounted therearound.
Claim 9
Dependent Claim
15 words
The rig as recited in claim 7 wherein said guide rings are made of brass.
Claim 10
Dependent Claim
17 words
The rig as recited in claim 7 wherein said guide rings are made of a polytetrafluoroethylene compound.
Claim 11
Dependent Claim
32 words
The rig as recited in claim 7 wherein each cushion cylinder is provided with breather means near the upper end thereof to prevent pneumatic locking of the cushion rod within its cylinder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |