Well string injection system and method

Wells – Processes – Disassembling well part

Reexamination Certificate

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Details

C166S077100, C166S077300, C166S378000

Reexamination Certificate

active

08056639

ABSTRACT:
A continuous feed injection unit used for example for injection and removal of continuous well string from wells operates in a dual speed configuration. The unit comprises a first hydraulic motor, a second hydraulic motor, cooperating continuous well string gripping chains connected to be driven by the first and second hydraulic motors, a hydraulic power supply connected to provide pressurized fluid to the first and second hydraulic motors and a control system for the hydraulic power supply. The control system for the hydraulic power supply has a motor speed control valve with at least a first and second operating configuration, the first operating configuration providing power fluid to the first and second hydraulic motors in parallel and the second operating configuration providing power fluid to the first and second hydraulic motors in series. The hydraulic power supply may be a conventional power tong hydraulic supply.

REFERENCES:
patent: 3285485 (1966-11-01), Slator
patent: 3313346 (1967-04-01), Cross
patent: 3373818 (1968-03-01), Rike et al.
patent: 3559905 (1971-02-01), Palynchuk
patent: 4515220 (1985-05-01), Sizer et al.
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patent: 6059029 (2000-05-01), Goode
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patent: 953644 (1974-08-01), None
patent: 1096850 (1981-03-01), None
patent: 1220418 (1987-04-01), None
patent: 1265998 (1990-02-01), None
Drawing marked Robishaw Engineering and titled Revised Hydraulic Circuit Corod Project 1301-048097B—alleged to show device in US for at least 15 years.
X-celerator information sheet distributed on Jun. 10, 2000 by C-tech Oilwell Technologies, Inc. at the Calgary Oil Show in Calgary, Alberta, Canada.
Drawing marked Robishaw Engineering and titled HYD Circuit Corod 502 Project 1301-048098B Design Engineers Handbook Bulletin 0224-B1 (includes new 2nd sheet containing copyright information) Sperry Vickers Mobile Hydraulics Manual M-2990-A, First Edition 1967, Second Edition 1979.
Industrial Fluid Power, vol. 3—Second Edition—includes the following new pp. 2, 81, 83, 85, 87, 89 and 103, (1979).
U.S. Deptartment of Labor Occupational Safety & Health Administration—www.osha.gov website Oil and Gas Well Drilling and Servicing eTool: Transporting Rig and Rigging Up (5 pages).

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