Patent RU-2713819-C1 (RU)
Title: Bottom-hole fluid flow switch in well for various operating modes (embodiments)
Inventor: OSIPOV YURIJ ALEKSANDROVICH
IPC: E21B34/12
Filed: 2018-10-11
Granted: 2020-02-07
Abstract: FIELD: oil, gas and coke-chemical industries. 
     SUBSTANCE: invention relates to the oil industry and can be used on new and already operated, inclined and horizontal, self-contained, offshore, non-equipped wells and deposits. Depth fluid flow switch in the well comprises a cylindrical housing having a different-diameter internal diameter. Radial holes are made on thickened part of the case. Hollow rod of different size with respect to its outer diameter. On one of the stem bulges there is a radial hole. Valve is four-position. In order to implement the method of producing anhydrous oil using the downhole gravity separation according to the first embodiment in the production string, opposite to perforation interval of upper formation there installed is detachable uncemented shank end with inter-string packers at ends and complete with fluid flows switch. Switch is moved to the second position. Reservoir oil is accumulated in the well cavity with water from the first formation, anhydrous oil is separated and squeezed to surface by compressed air. Precipitated water, after switching the valve to the third position, is squeezed into the second formation. In order to implement the method of jointly-separate oil production in horizontal wells from two different sections of horizontal shaft according to the second embodiment, a composite shank, divided into three sections by packers, is lowered into the horizontal shaft in one formation. Filtration column is lowered to remote section. Middle buffer section is covered with continuous casing pipes. Near section is covered with continuous casing pipes and fixed in the shoe of the production string. Liquid flow switch is installed in the fourth position and combined extraction of oil is performed. In order to implement the method of extracting anhydrous oil from horizontal wells according to the third embodiment, the liquid flows switch is switched to the third position, reservoir oil is accumulated in the well cavity with water from the first formation and separated. Anhydrous oil is squeezed to the surface by compressed air. Switch is moved to the second position and the deposited water is squeezed to the remote section of the formation. To implement the method of jointly-separate oil production in two-well wells from two different horizontal shafts according to the fourth embodiment, the switch is changed to the fourth position and separate oil production is performed. In order to implement the method of producing anhydrous oil from two-well wells using the downhole gravity separation according to the fifth embodiment, the liquid flows switch is switched to the third position, reservoir oil is accumulated in the well cavity with water from the first formation and separated. Anhydrous oil is squeezed to the surface by compressed air. Switch is moved to the second position and the deposited water is squeezed to the remote section of the formation. 
     EFFECT: increased efficiency of wells operation at simultaneous separate extraction with downhole separation. 
     6 cl, 7 dwg