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US 7,717,193 B2Granted
AC powered service rig
AssigneeNabors Canada
InventorsTed Egilsson, Ken Andreasen
Life of this patent
Estimating the term…
Abstract
An electrically-powered service rig utilizes an engine-driven generator to power a propulsion system, a drawworks system and a sandline system, all mounted on a single mobile platform. The rig utilizes lightweight permanent magnet motors to enable integration of the systems onto a single mobile platform which meets transport regulations. The rig's power plant is capable of powering other onsite equipment such as mud pump motors through use of umbilicals connected to the engine-driven generator.
Claims20
An electrically-powered well service rig comprising:
- a mobile platform for transporting the service rig;
- an engine-driven generator carried by the platform for generating AC power;
- a propulsion system carried by the platform for transporting the mobile platform service rig having a collapsible mast thereon, the propulsion system having a permanent magnet propulsion motor for driving the platform, a propulsion variable frequency drive (VFD) connected between the generator and the propulsion motor and a propulsion programmable logic controller (PLC) outputting speed setpoints to the propulsion VFD;
- a drawworks system carried by the platform and having blocks adapted for raising and lowering a plurality of tubulars into and out of a wellbore, the tubulars having one or more flag locations thereon, the drawworks system having at least a drawworks drum having drawworks cable wound thereon and rotatably driven by a permanent magnet drawworks motor;
- a drawworks VFD connected between the generator and the drawworks motor and a drawworks PLC outputting speed setpoints to the drawworks VFD;
- drawworks sensors for establishing measures of the running position of the one or more flag locations and communicating said measures to the drawworks PLC;
- and one or more target locations representing physical positions on or off the service rig wherein the drawworks PLC reduces the maximum speed setpoint for the drawworks VFD as the flag locations of the tubing are within a window distance of the target location;
- and
- a sandline system carried by the platform and adapted for raising and lowering a sandline tool into and out of a wellborn, the sandline system having at least a sandline drum having sandline cable wound thereon and rotatably driven by a permanent magnet sandline motor;
- a sandline VFD connected between the generator and the sandline motor and a sandline PLC for outputting speed data points to the sandline VFD.
7 more elements
An electrically-powered well service rig comprising:
- a mobile platform for transporting the service rig,
- an engine-driven generator carried by the platform for generating AC power;
- a propulsion system carried by the platform for transporting the mobile platform service rig having a collapsible mast thereon, the propulsion system having a permanent magnet propulsion motor for driving the platform, a propulsion variable frequency drive (VFD) connected between the generator and the propulsion motor and a propulsion programmable logic controller (PLC) outputting speed setpoints to the propulsion VFD;
- a drawworks system carried by the platform and having blocks adapted for raising and lowering a plurality of tubulars having one or more flag locations thereon into and out of a wellbore, the drawworks system having at least a drawworks drum having drawworks cable wound thereon and rotatably driven by a permanent magnet drawworks motor;
- a drawworks VFD connected between the generator and the drawworks motor and a drawworks PLC outputting speed setpoints to the drawworks VFD;
- a sandline system carried by the platform and adapted for raising and lowering a sandline tool into and out of a wellbore, the sandline tool having one or more flag locations thereon, the sandline system having at least a sandline drum having sandline cable wound thereon and rotatably driven by a permanent magnet sandline motor;
- a sandline VFD connected between the generator and the sandline motor and a sandline PLC outputting speed setpoints to the sandline VFD;
- and
- sandline sensors for establishing measures of the position of the one or more flag locations and communicating said measures to the sandline PLC;
- and one or more target locations wherein the sandline PLC reduces the maximum speed setpoint for the sandline VFD as the position of the one or more flag locations of the sandline tool are within a window distance of the target locations.
7 more elements
Dependencies are inferred from the claim text.