Down hole drilling assembly with concentric casing actuated jet pump

摘要

A concentric casing actuated jet pump is disclosed that induces artificial lift to remove the drilling and production fluid from a well bore during drilling operations by means of a single or multiple hydraulic jet pumps attached to a concentric string of casing. The invention includes a drill string that passes through the jet pump assembly so that the power fluid is separated from the drilling fluid until it enters the jet pump. The jet pump assembly is joined to a concentric casing string. The jet pump also contains a bladder element that inflates or expands to redirect the flow of the drilling and production fluid from the inner annulus into the jet pump assembly. Vertical displacement of the inner casing string by a casing jack causes the bladder to redirect the flow of drilling fluid form the inner annulus into the jet pump assembly.