Enhancing torque electric motor drive and control system for rotary steerable system
AssigneeHalliburton Energy Services, Inc.
InventorRichard Thomas Hay
Life of this patent
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Abstract
An example embodiment of a pipe-in-pipe electric motor assembly includes a drilling string that includes an inner pipe, an outer pipe, and an electric motor. The electric motor is provided with power supplied by the inner pipe and the outer pipe acting at least as conductors. A latching mechanism connects the drilling string and an electric motor output shaft. The electric motor output shaft is driven by the electric motor. The latching mechanism prevents the electric motor output shaft from rotating slower than the drilling string and associated methods.
Claims19
An electric motor assembly comprising:
- a drilling string comprising an inner pipe and an outer pipe, the inner pipe and the outer pipe comprising first and second conductors, respectively;
- an electric motor electronically coupled to the inner pipe and the outer pipe to receive current passing through the first and second conductors;
- a latching mechanism connecting the drilling string and a drive shaft, wherein the drive shaft is driven by the electric motor, wherein the latching mechanism allows selective rotation of the drive shaft in one direction compared to a rotation direction of a housing of the electric motor, and wherein the latching mechanism is configured to selectively engage the drilling string to prevent the drive shaft from rotating slower than the drilling string;
- and
- a flow diverter fluidically coupled to the inner pipe and electrically insulated from the outer pipe, wherein the flow diverter allows fluid flow to an end of the drilling string and fluidly couples an interior of the inner pipe to an exterior of the outer pipe.
A method of providing power to an electric motor comprising:
- providing a drilling string comprising an inner pipe and an outer pipe, the inner pipe and the outer pipe comprising first and second conductors, respectively,
- electrically coupling an electric motor to the inner pipe and the outer pipe;
- connecting the drilling string and a drive shaft with a latching mechanism, wherein the drive shaft is driven by the electric motor, wherein the latching mechanism allows selective rotation of the drive shaft in one direction compared to a rotation direction of a housing of the electric motor, and wherein the latching mechanism prevents the drive shaft from rotating slower than the drilling string;
- generating current through the inner pipe, electric motor, and outer pipe;
- and
- providing a flow diverter fluidically coupled to the inner pipe and electrically insulated from the outer pipe, wherein the flow diverter allows a fluid to flow to an end of the drilling string and fluidly couples an interior of the inner pipe to an exterior of the outer pipe.
A method of drilling a wellbore in a subterranean formation comprising:
- providing a drilling string comprising an inner pipe and an outer pipe,
- electrically coupling an electric motor to the inner pipe and the outer pipe;
- connecting the drilling string and a drive shaft with a latching mechanism, wherein the drive shaft is driven by the electric motor, wherein the latching mechanism allows selective rotation of the drive shaft in one direction compared to a rotation direction of a housing of the electric motor, and wherein the latching mechanism prevents the drive shaft from rotating slower than the drilling string;
- generating current through the inner pipe, electric motor, and outer pipe;
- applying rotational power to a drill bit coupled to the drive shaft;
- and
- flowing a fluid through a flow diverter fluidically coupled to the inner pipe and electrically insulated from the outer pipe, wherein the flow diverter allows the fluid to flow to an end of the drilling string and fluidly couples an interior of the inner pipe to an exterior of the outer pipe.
Dependencies are inferred from the claim text.