Title:
COILED TUBING INJECTOR WITH A WEIGHT ON BIT CIRCUIT
Document Type and Number:
WIPO Patent Application WO2008039411
Kind Code:
B1
Abstract:
A control circuit for a coiled tubing injector includes a circuit controller (14). One or more counterbalance valves (3) may be responsive to the circuit controlier to prevent the tubing string from descending into the wellbore during rate of penetration movement. In one embodiment, a control valve (4) allows fluid to flow through a bypass line around the counterbalance valves when drilling in a weight-on-bit mode. Other hydraulic control circuits allow for the release of fluid pressure to control the injector hydraulic motor. In yet another embodiment, the control circuit regulates power to an electric motor of the injector.
Inventors:
HAVINGA RICHARD D (CA)
Application Number:
PCT/US2007/020585
Publication Date:
September 04, 2008
Filing Date:
September 24, 2007
Export Citation:
Assignee:
XTREME COIL DRILLING CORP (US)
HAVINGA RICHARD D (CA)
HAVINGA RICHARD D (CA)
International Classes:
F16D31/02
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