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

Claim 8:
9. A method, comprising:
pumping drilling fluid from a surface, through a drill string, into an annulus formed between the drill string and a wellbore, and back to the surface;
measuring at least one property of the drilling fluid, wherein the at least one property comprises a resistivity or a conductivity of the drilling fluid;
adjusting, based on the at least one property, a pressure of the drilling fluid in the annulus by adjusting a rotational speed of a turbine having a plurality of blades extending at least partially radially through the annulus, wherein adjusting the pressure comprises:
decreasing the pressure in a first mode of operation by rotating the turbine independently from the drill string to assist a flow of the drilling fluid through the turbine; and
increasing the pressure in a second mode of operation by rotating the turbine independently from the drill string to impede the flow of the drilling fluid through the turbine, wherein the flow of the drilling fluid is in a common direction through the turbine in the first and second modes of operation; and

adjusting, based on the at least one property, the pressure of the drilling fluid in the annulus by adjusting an electromagnetic force on the flow of the drilling fluid through the turbine via a magneto hydrodynamic circuit, wherein the magneto hydrodynamic circuit is configured to switch between a first electromagnetic force to assist the flow of the drilling fluid through the turbine and a second electromagnetic force to impede the flow of the drilling fluid through the turbine.