WELL OPERATION INSTALLATION Russian patent published in 2014 - IPC E21B43/38 F04F5/54 

FIELD: oil and gas industry.

SUBSTANCE: in the installation comprising a flow string with a centrifugal pump run in to the production string and connected to the water line at the wellhead equipment, a separating chamber in the lower part of the well bore under an electric-centrifugal pump equipped with a sealed case, a channel for separated oil passage that communicates annular space of the well with the separating chamber, inlet ports for separated water according to the invention the case of the electric-centrifugal pump is made so that it connects hydraulically suction of the electric-centrifugal pump with an input device located in the separating chamber and consisting of the shank plugged at the lower end and divided into sections with inlet ports, at that at the level of each inlet ports the shank is equipped with a cup performing functions of the separated water input to the input device and function of hydraulic lock for oil drops, at that inlet ports are located in one row along the shank with a decreasing diameter in each subsequent section in upward direction, and the channel for oil drops passage serves as a gap between the case and production string of the well. In order to lift separated oil from the annular space to the surface the tubing string has a larger diameter and the tubing string of less diameter is placed in it and the upper part of the latter is fixed rigidly to the oil line while its lower part is inserted hermetically in the upper cylindrical chamber of the switch mounted in the tubing string of a larger diameter at the depth below dynamic fluid level in the well, at that the switch is equipped with vertical peripheral channels for teeter water passage through it and with the lower cylindrical chamber for location of the inserted jet pump consisting of a nozzle, a mixing chamber and diffuser, which output is communicated with the upper cylindrical chamber. Operating fluid to the jet pump comes from the electric-centrifugal pump and the pumped fluid from the switch side channel from the well annular space via a back-pressure valve located at the switch exterior. In order to seal the inserted jet pump in the lower cylindrical chamber its case is equipped with sealing glands and a clamp hollow cylindrical screw at the outside. The jet pump case has radial openings under entry to the mixing chamber and a circular bore at the outside. The installation ensures oil separation from water practically in any quantity of the fluid produced from water supply wells due to potential use of the device without limitation of its rational length. Use of the installation allows maintenance of injectors intake capacity due to more qualitative treatment of intake water from oil and production of additional volume of oil from water supply wells. The installation also allows economically feasible use of a wide range of highly watered oil wells with water cut of 95%-99% as water intake donors considering their territorial location in the oil deposits, where maintenance of formation pressure is required by crosswell water pumping.

EFFECT: downhole separation of oil from the extracted product and separate lifting of oil and water to the surface at crosswell water pumping aimed to maintain formation pressure.

3 cl, 3 dwg