Global Patent Index - EP 1025359 A1

EP 1025359 A1 2000-08-09 - HYDRAULIC PUMP JACK DRIVE SYSTEM FOR RECIPROCATING AN OIL WELL PUMP ROD

Title (en)

HYDRAULIC PUMP JACK DRIVE SYSTEM FOR RECIPROCATING AN OIL WELL PUMP ROD

Title (de)

HYDRAULISCHER ANTRIEB FÜR DAS GESTÄNGE EINER TIEFPUMPE ZUR FÖRDERUNG VON ERDÖL

Title (fr)

SYSTEME HYDRAULIQUE D'ENTRAINEMENT POUR CHEVALET DE POMPAGE, DESTINE A ACTIONNER UNE TIGE DE POMPAGE DANS UN PUITS DE PETROLE

Publication

EP 1025359 A1 (EN)

Application

EP 98923953 A

Priority

  • CA 9800525 W
  • US 86753697 A
  • US 6696098 A

Abstract (en)

[origin: WO9855766A1] A hydraulic pump jack drive system (1) for reciprocating an oil well pump rod (6). The drive system comprises at least one hydraulic well head cylinder (2), a reversible flow hydraulic pump (7), and a master cylinder (8). The master cylinder has a free floating master piston (11) and at least one fixed bulkhead. The master cylinder also has a working fluid chamber (16) hydraulically connected to the hydraulic well head cylinder and at leat two master piston drive chambers (17, 18) hydraulicallly connected to the hydraulic pump. The hydraulic well head cylinder and the working fluid chamber are filled with a working fluid and define a working fluid system while the master piston drive chambers and the hydraulic pump are filled with hydraulic fluid and define a hydraulic drive system. Reversing the flow of the hydraulic pump causes the master piston drive chambers to be pressurized and de-pressurized on an alternating basis to reciprocally move the master piston within the master cylinder. The reciprocating master piston causes an alternating pressurizing and de-pressurizing of the working fluid chamber and the well head cylinder thereby causing the pump rod to reciprocate within the oil well.

IPC 1-7 (main, further and additional classification)

F04B 47/04

IPC 8 full level (invention and additional information)

F04B 47/04 (2006.01)

CPC (invention and additional information)

F04B 47/04 (2013.01)

Citation (search report)

See references of WO 9855766A1

Designated contracting state (EPC)

AT BE CH DE DK FI GB LI NL SE

EPO simple patent family

WO 9855766 A1 19981210; AU 7633498 A 19981221; CA 2255603 A1 19981210; CA 2255603 C 20010220; EP 1025359 A1 20000809

INPADOC legal status


2002-05-15 [18R] REFUSED

- Effective date: 20011209

2000-10-18 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20000830

2000-08-09 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000412

2000-08-09 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH DE DK FI GB LI NL SE