44results about How to "Isolate the invasion" patented technology

The invention belongs to the field of mechanical equipment for sandstone reservoir exploitation, and particularly relates to an oil well pumping pipe capable of automatically removing sand. The oil pumping pipe is composed of a sand collecting pipe and multiple sand discharging pipes from bottom to top, wherein the sand collecting pipe and the sand discharging pipes are connected in a butt joint mode. Each sand discharging pipe from inside to outside comprises an inner cavity pipe, sand pushing rotors and an outer protecting pipe which are connected in a sleeved mode in sequence, wherein through holes are formed in the inner cavity pipe and the outer protecting pipe, and each sand pushing rotor is composed of a spiral screen and a sand pushing pipe arranged on the end of the spiral screen. Butt-joint end covers are arranged on both ends of each outer protecting pipe and the top of the sand collecting pipe, the tops of the sand pushing pipes are connected with annular adaptors, and the annular adaptors are connected with the outer protecting pipes and the inner cavity pipes through outer bearings and inner bearings respectively. The oil well pumping pipe is simple in structure and smart in design, on the basis of further optimizing the mechanical sand preventing effect, sand is pushed downwards by the sand pushing rotors which are driven by liquid flow in drainage, and accumulation of sand between the outer protecting pipes and the inner cavity pipes is prevented to the utmost extent.