Patent ID: 11920414
Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC E  F | IPC E  F

Claim 0:
1. An apparatus, comprising:
a rotor including:
an inner ring configured to be positioned around a drill pipe;
an outer ring that is positioned around and spaced apart from the inner ring;
a plurality of magnets coupled to the outer ring; and
a plurality of blades coupled to and extending between the inner ring and the outer ring; and

a stator including:
a housing configured to fit into an annulus between the drill pipe and a surrounding tubular, and to receive the outer ring at least partially therein; and
a plurality of coils that communicate with the plurality of magnets, such that in a first mode of operation, the rotor rotates the plurality of blades independently from the drill pipe to assist a fluid flow therethrough and decrease a drilling fluid pressure in the annulus, and in a second mode of operation, the rotor rotates the plurality of blades independently from the drill pipe to impede the fluid flow therethrough and increase the drilling fluid pressure in the annulus, wherein the fluid flow is in a common direction through the rotor between the plurality of blades in the first and second modes of operation; and

wherein the apparatus is configured to adjust a rotational speed of the rotor between the first and second modes of operation based on at least one property of the fluid flow, wherein the at least one property comprises a resistivity or a conductivity of the fluid flow.