Patent ID: 11946373
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 12:
13. A drilling system for drilling a borehole, the drilling system comprising:
a drill string;
a drill bit coupled to the drill string;
a mud motor coupled to the drill string and operable to rotate the drill bit via a driveshaft;
a bearing assembly coupled to a downhole end of the mud motor and operable to support the driveshaft, the bearing assembly comprising:
a plurality of bearings positioned circumferentially around a bore of the bearing assembly, wherein the bore of the bearing assembly is positioned circumferentially around a main fluid flow path;
the driveshaft comprising a first housing defining the main fluid flow path;
a second housing defining a bypass flow path toward an annulus of a wellbore; and
a flow control choke between the first housing and the second housing, the flow control choke including a rotatable section and a stationary section that is stationary relative to the rotatable section, the stationary section having a curved interface with the rotatable section for restricting a flow of a drilling fluid, wherein the curved interface of the stationary section has a direction of concavity that is substantially parallel to the main fluid flow path, wherein the rotatable section is axially movable within the bypass flow path to contact the stationary section and to restrict the flow of the drilling fluid through the bypass flow path, and wherein a biasing mechanism is positioned within the bypass flow path to bias the rotatable section into contact with the stationary section; and

a motor steerable system coupled to the drill bit and operable to direct the drill bit in a direction.