DRILLING MUD SCREENING SYSTEM Russian patent published in 1995 - IPC

FIELD: well drilling. SUBSTANCE: drilling mud screening system has receiving vessels with separating sections intercommunicated by trough system. There are vibrating screens with bottom plate, separating branch pipe and slide gates. They connect vibrating screens with manifold. There are desanders installed successively, desilters, degassers, sludge pumps and troughs, additional slide gate, additional vibration screen with bottom plate, individual drive and screen. Screen meshes are sizing 1.5x1.5 mm. Shaking amplitude is not above 1.5 and not less than 1.0 mm. Main vibration screens have meshes with sizes smaller than that of additional vibration screen. Level of bottom of bottom plate of additional vibration screen is not lower than overflow level from bottom plate of main vibration screens into vessel. Bottom plate of additional vibration screen has overflow onto main vibration screens. Additional slide gate is located in separating branch pipe and communicates additional vibration screen with manifold. EFFECT: higher efficiency and reliability of system operation in drilling tough clay rocks. 1 dwg