Well pumping unit with adjustable balance beam
This patent describes a well pumping unit for reciprocating a pump rod extending into a well and connected to a downhole pump. It comprises an elongated beam, means pivotally supporting the beam for oscillation about a horizontal pivot axis adjacent a mid-point of the beam, one end of the beam being connected to the pump rod for operating the downhole pump and lifting a downhole load, a power unit connected to the other end of the beam to oscillate the beam about its pivot axis to reciprocate the pump rod, the beam including an outer component connected to the pivot axis and a telescopically oriented inner member longitudinally slidably received in the outer component to vary the ratio of the length of the beam on each side of the pivot axis, the power unit including a rotatable crank shaft having an eccentric, a motor driving the crank shaft and a longitudinally adjustable rod interconnecting the eccentric shaft and a longitudinally adjustable rod interconnecting the eccentric on the crank shaft with the end of the adjustable inner member of the beam to maintain or vary the stroke of the pump rod, the means pivotally supporting the beam including a support base to enable the well pumping unit to be supported at a well site, and means interconnecting the base and power unit to move the power unit along the base, the means adjusting the power unit including a threaded shaft journalled on the base and engaging a threaded nut rigid with the power unit, a hand wheel connected to the threaded shaft for rotating the threaded shaft to move the power unit along with the telescopic inner member of the beam in relation to the outer component of the beam supported from the base.
- Assignee:
- NOV; NOV-92-030044; EDB-92-114664
- Patent Number(s):
- US 5105671; A
- Application Number:
- PPN: US 7-671463
- OSTI ID:
- 5053732
- Resource Relation:
- Patent File Date: 9 Mar 1991
- Country of Publication:
- United States
- Language:
- English
Similar Records
Pump jack system for oil well
Cruciform engine