HIGHLY-VISCOUS OIL PRODUCTION DEVICE Russian patent published in 2007 - IPC E21B43/24 

FIELD: oil production, particularly to produce heavy viscous and paraffin-resin crude oil.

SUBSTANCE: device comprises production string with working orifices and pipeline. Pipeline is arranged inside production string in well penetrating upper and lower oil-bearing reservoirs and flowing water bearing layer. The pipeline is provided with one-way valve and with upper and lower check valves. Working orifices are aggregated in three groups, namely in upper, central and lower ones. Extreme working orifice groups are opposite to oil-bearing reservoir and central one is opposite to flowing water bearing layer. Space between production string and pipeline is separated over upper oil-bearing reservoir, flowing water bearing layer and lower oil-bearing reservoir with upper, central and lower packers correspondingly. Pipeline has seat located over the valves. The seat provides air-tight plunger pump cylinder installation so that the cylinder communicates with upper and lower oil-bearing reservoirs correspondingly through upper and lower working orifice group, as well as through upper and lower check valves and pipeline interior for heated oil transfer. Pipeline interior may be communicated with flowing water bearing layer through central working orifice group by means of one-way valve for heat-carrier supply as plunger pump is lifted over the seat.

EFFECT: prevention of heat-carrier contact with well product due to product extraction by means of sucker-rod pump, increased efficiency of product heating inside well and decreased heat-carrier preconditioning costs.

2 dwg