DRILLING MUD CLEANING METHOD AND DEVICE Russian patent published in 2005 - IPC

FIELD: well drilling equipment, particularly arrangements for treating drilling fluids outside the borehole.

SUBSTANCE: method involves performing the first cleaning stage with the use of vibrosieve; performing the second cleaning stage with the use of hydrocyclone desander and performing the third stage with the use of desilter; cleaning drilling mud with the use of centrifuge and conveying the clean drilling mud to accumulation vessels for following drilling; circulating drilling mud through process vessels inside the well; performing drilling mud cycling outside well along with drilling mud circulation through process vessels inside the well by supplying the clean drilling mud into process vessels adapted for receiving drilling mud from the first, the second and the third cleaning stages to dilute thereof with drilling mud exiting the well in amount enough to equalize density of drilling mud to be cleaned. After drilling mud cleaning in desander and desilter the drilling mud is additionally cleaned in serially arranged hydrocyclone desilter forming the forth cleaning stage. Drilling mud cleaning device comprises gutter connecting well head with serially arranged vibrosieves, hydrocyclone system including hydrocyclone desander and desilter, centrifuge with process vessels for receiving drilling mud, mud pumps serially installed in accordance with cleaning stages, process drilling mud accumulation vessels joined into circulation system for drilling mud movement through the well. Circulation system provides drilling mud cycling outside the well along with circulation thereof through the well with the use of mud pump and mud pipelines, which supply the clean drilling mud from process accumulation vessels in process vessels receiving drilling mud from the first, the second and the third cleaning stages to dilute thereof with drilling mud exiting the well. Hydrocyclone system is additionally provided with serially installed hydrocyclone desilter adapted to separate fine sludge particles and forming the forth drilling mud cleaning stage.

EFFECT: increased quality of drilling mud cleaning.

4 cl, 6 dwg