Mud gas separator or mud- gas separator is a vertical steel cylinder installed on the mud flowline near the mud tanks used to separate formation gas from returning drilling mud on a drilling rig. A butterfly valve in the flowline can divert the returning mud to the side inlet and hits an impingement plate that is perpendicular to the flow. The gas bubbles are removed in a thin layer over a wide sheet. The separated gas is vented from the top or goes through a gas flowline to a flare. The degassed mud from the bottom of the mud gas separator returns to the flowline.
Mud gun is a device that agitates drilling mud in the reserve and suction mud tanks of a drilling rig. It is a centrifugal pump or mud pump that directs drilling mud through a pipe and nozzle on both vertical and horizontal swivels. The drilling mud jets into the mud in the mud tanks. Mud guns are also used to mix lost- circulation material that floats into drilling mud.
Mud hopper is a funnel shaped device used to mix the liquid and solid components of drilling mud at the drill site. A jet of high-pressure drilling mud located on the hopper bottom is powered by a spare rig pump. It pulls the dry components through the hopper to mix with the liquid.