Data processing: generic control systems or specific application – Specific application – apparatus or process – Mechanical control system
Reexamination Certificate
2005-08-30
2005-08-30
Bahta, Kidest (Department: 2125)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Mechanical control system
C700S285000, C137S002000, C073S001160, C702S045000
Reexamination Certificate
active
06937923
ABSTRACT:
The present invention generally provides a closed feedback system for operating peripheral devices in response to environmental conditions. Illustrative environmental conditions include well bore pressure, line pressure, fluid levels, flow rates and the like. In one embodiment, a flow controller disposed in a fluid line is operated in response to operating variable readings (e.g., pressure and/or flow rate) taken in the flow line and/or a well bore. The variable measurements are then compared to target values. If necessary, the flow controller is closed or opened to control the rate of fluid flow through the flow line and thereby achieve the desired target values. In another embodiment, the operation of a pump motor is monitored. Operating variables, such as voltage, current and load, are measured and compared to target values. In the event of a difference between the actual values of the variables and the target values, the flow controller is adjusted to affect the head pressure on a pump being driven by the motor. In some cases, the motor operation may be halted or otherwise adjusted.
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patent: 4971522 (1990-11-01), Butlin
patent: 5819848 (1998-10-01), Rasmuson et al.
patent: 5941305 (1999-08-01), Thrasher et al.
patent: 6119781 (2000-09-01), Lemetayer et al.
patent: 0 945 589 (1999-09-01), None
patent: 2 336 864 (1999-11-01), None
International Search Report from the European Patent Office for International App. No. PCT/GB01/04686, dated Mar. 4, 2002.
Bahta Kidest
Moser, Patterson & Sheridan L.L.P.
Weatherford / Lamb, Inc.
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