NL7806575A - Hydraulic-pneumatic drive for down hole oil well pump connecting rods - has pneumatic constant pressure cylinders to balance weight of assembly and hydraulic accelerating and retarding cylinders - Google Patents
Hydraulic-pneumatic drive for down hole oil well pump connecting rods - has pneumatic constant pressure cylinders to balance weight of assembly and hydraulic accelerating and retarding cylindersInfo
- Publication number
- NL7806575A NL7806575A NL7806575A NL7806575A NL7806575A NL 7806575 A NL7806575 A NL 7806575A NL 7806575 A NL7806575 A NL 7806575A NL 7806575 A NL7806575 A NL 7806575A NL 7806575 A NL7806575 A NL 7806575A
- Authority
- NL
- Netherlands
- Prior art keywords
- hydraulic
- cylinders
- pump
- pneumatic
- drive
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/02—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level
- F04B47/04—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level the driving means incorporating fluid means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Reciprocating downhole oil well pump is driven via a connecting rod string by means of a hydro-pneumatic drive comprising >=1, single acting pneumatic cylinder coupled to a constant pressure gas reservoir and >=1 double acting hydraulic cylinder. The gas cylinder piston exerts an upward force on the pump con-rods equal to the average of the maximum tension force on the up stroke and the maximum tension force on the downstroke, whilst the hydraulic cylinder drives both up and down in such a manner that the velocity/time characteristic of the pump is approximately sinusoidal. The pref. drive assembly comprises a series of alternate gas and hydraulic pistons distributed in a circle around the pump rods and attached to the upper end of the rods via a cross-head. The gas cylinders are connected to a nitrogen buffer vessel with a capacity several times greater than the total capacity of the gas cylinder and the buffer vessel is coupled via a pressure regulating device to a nitrogen reservoir. The double acting hydraulic cylinders are coupled to two horizontally opposed single acting pump cylinders driven by a crank shaft via a step-down gearbox, flywheel and electric motor. The flywheel is on the motor side to reduce its weigth and is of sufficient mass to ensure its constant rotational speed and, consequently, a sinusoidal output from the hydraulic pumping cylinders. The hydraulic system is also connected to an oil pump and reservoir which compensate for fluid leakage. The drive is much lighter than the traditional mechanical crank arm and balancing wheel drive.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7806575A NL7806575A (en) | 1978-06-19 | 1978-06-19 | Hydraulic-pneumatic drive for down hole oil well pump connecting rods - has pneumatic constant pressure cylinders to balance weight of assembly and hydraulic accelerating and retarding cylinders |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7806575A NL7806575A (en) | 1978-06-19 | 1978-06-19 | Hydraulic-pneumatic drive for down hole oil well pump connecting rods - has pneumatic constant pressure cylinders to balance weight of assembly and hydraulic accelerating and retarding cylinders |
Publications (1)
Publication Number | Publication Date |
---|---|
NL7806575A true NL7806575A (en) | 1979-12-21 |
Family
ID=19831064
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL7806575A NL7806575A (en) | 1978-06-19 | 1978-06-19 | Hydraulic-pneumatic drive for down hole oil well pump connecting rods - has pneumatic constant pressure cylinders to balance weight of assembly and hydraulic accelerating and retarding cylinders |
Country Status (1)
Country | Link |
---|---|
NL (1) | NL7806575A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993018306A2 (en) * | 1992-03-03 | 1993-09-16 | Lloyd Stanley | Hydraulic oil well pump drive system |
CN103510920A (en) * | 2012-06-16 | 2014-01-15 | 姜汝诚 | Hydraulic energy-storage oil pumping unit |
CN104963659A (en) * | 2015-07-02 | 2015-10-07 | 中国石油天然气股份有限公司 | Hydraulic drive oil pumping device |
CN114645694A (en) * | 2022-05-23 | 2022-06-21 | 山东胜信石油装备有限公司 | Vertical oil pumping machine capable of automatically adjusting stroke frequency and balancing |
-
1978
- 1978-06-19 NL NL7806575A patent/NL7806575A/en not_active Application Discontinuation
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993018306A2 (en) * | 1992-03-03 | 1993-09-16 | Lloyd Stanley | Hydraulic oil well pump drive system |
WO1993018306A3 (en) * | 1992-03-03 | 1994-01-06 | Lloyd Stanley | Hydraulic oil well pump drive system |
GB2278892A (en) * | 1992-03-03 | 1994-12-14 | Lloyd Stanley | Hydraulic oil well pump drive system |
US5447026A (en) * | 1992-03-03 | 1995-09-05 | Stanley; Lloyd | Hydraulic oil well pump drive system |
GB2278892B (en) * | 1992-03-03 | 1996-08-28 | Lloyd Stanley | Hydraulic oil well pump drive system |
US5832727A (en) * | 1992-03-03 | 1998-11-10 | Stanley; Lloyd | Hydraulic oil well pump drive system |
CN103510920A (en) * | 2012-06-16 | 2014-01-15 | 姜汝诚 | Hydraulic energy-storage oil pumping unit |
CN104963659A (en) * | 2015-07-02 | 2015-10-07 | 中国石油天然气股份有限公司 | Hydraulic drive oil pumping device |
CN114645694A (en) * | 2022-05-23 | 2022-06-21 | 山东胜信石油装备有限公司 | Vertical oil pumping machine capable of automatically adjusting stroke frequency and balancing |
CN114645694B (en) * | 2022-05-23 | 2022-07-19 | 山东胜信石油装备有限公司 | Vertical oil pumping machine capable of automatically adjusting stroke frequency and balancing |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
BV | The patent application has lapsed |