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

Claim 16:
17. A method, comprising:
pumping a 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;
adjusting a pressure of the drilling fluid in the annulus by adjusting a rotational speed of a mud turbine in the annulus, wherein the mud turbine is configured to rotate independently from the drill string;
measuring one or more properties of the drilling fluid in the annulus using a magneto hydrodynamic circuit of the mud turbine, wherein the one or more properties comprises a resistivity or a conductivity of the drilling fluid, and the magneto hydrodynamic circuit is partially formed by the drilling fluid in the mud turbine; and
refining the pressure of the drilling fluid in the annulus using the magneto hydrodynamic circuit to apply an electromagnetic force on the drilling fluid in the mud turbine, wherein the magneto hydrodynamic circuit is configured to vary the electromagnetic force to selectively assist a flow of the drilling fluid through the mud turbine and impede the flow of the drilling fluid through the mud turbine.