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 oil-bearing reservoir and water-bearing layer. The pipeline is provided with one-way valve and check valve. Working orifices are aggregated in two groups, namely in upper and lower ones. The working orifice groups are opposite to oil-bearing reservoir and water-bearing layer correspondingly. Space between production string and pipeline is separated over oil-bearing reservoir and water-bearing layer with upper and lower packers correspondingly. Pipeline has seat located over one-way and check valves. The seat provides air-tight plunger pump cylinder installation so that the cylinder communicates with oil-bearing reservoir through upper working orifice group, check valve and pipeline interior for heated oil transfer. Pipeline interior may be communicated with water-bearing layer through lower working orifice group by means of one-way valve 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