Abstract: Provided are methods, apparatus, and computer-readable media for controlling parameters of drilling fluid. In an example, provided is a method including (i) receiving, by a drilling fluid flow controller, information indicating a measured inflow rate of drilling fluid flowing into a wellbore; (ii) receiving, by the drilling fluid flow controller, information indicating a measured outflow rate of the drilling fluid flowing out of the wellbore; (iii) calculating a differential flowrate between the measured inflow rate and the measured outflow rate; (iv) calculating a proportional gain from the differential flowrate and a setpoint; (v) calculating an integral gain from the differential flowrate and the setpoint; (vi) calculating, by the drilling fluid flow controller, a choke control output by summing the proportional gain with the integral gain; and (vii) moving, responsive to the choke control output, a position of the choke valve. Other methods, systems, and computer-readable media are also disclosed.

Abstract: A gas separator, gas separation system, and method for separating gas from drilling cuttings by actively maintaining a liquid seal of liquid in a lower portion of a separation vessel by controlling an introduced amount of the liquid admitted to the separation vessel as a removed amount of the liquid is removed from the separation vessel and by promoting agitation of the drilling cuttings in the liquid in an agitation chamber within the lower portion of the separation vessel to aid removal of the drilling cuttings along with the removed amount of the liquid.

Abstract: An apparatus for grinding a shank of a drill bit includes a base and several movable jaws supported by the base, that are movable toward each other and away from each other. A support ring is rotatably secured to the base, which has a central opening that encircles the movable jaws. A laterally adjustable grinding wheel support is secured to the support ring. Incremental rotation of the support ring results in incremental orbital movement of the grinding wheel support relative to the movable jaws. Lateral adjustment of the grinding wheel support moves the grinding wheel support toward and away from the movable jaws.