The invention relates to the technical field of oil exploitation, and discloses a
drilling fluid sand pump for oil exploitation. The
drilling fluid sand pump comprises a bottom frame, a sealing
assembly and an external motor, wherein a movable cavity is fixedly formed in the top of the bottom frame, a low-pressure inlet is formed in the left side of the back of the movable cavity, a high-pressureoutlet is formed in the middle of the right side of the movable cavity, an
impeller is movably connected to the middle of an inner cavity of the movable cavity in a sleeved mode, and a fixing frame isfixedly installed on the top surface of the movable cavity. Through the arrangement of a wear-resisting
rubber ring and a
extrusion block, when the rotating speed of the
impeller is increased to enable the pressure inside the movable cavity to be increased, the
extrusion block is extruded upwards to increase the
contact force between the wear-resisting
rubber ring and the
extrusion block and between the wear-resisting
rubber ring and a main shaft, so that the sealing performance inside the movable cavity is reinforced along with the increase of the rotating speed and the pressure, and the
failure probability caused by leakage of a sand pump is reduced; and moreover, a layer of protection is provided for the sealing
assembly, invasion of a
drilling fluid is reduced, the service life of thesealing
assembly is prolonged, and the maintenance cost is reduced.