METHOD FOR THERMAL EFFECT ON BOTTOMHOLE FORMATION ZONE WITH HIGH-VISCOSITY OIL AND DEVICE THEREFOR

摘要

FIELD: oil industry.;SUBSTANCE: group of inventions relates to oil industry. Method of thermal effect on bottomhole formation zone with high-viscosity oil includes lowering of downhole electric heater on production tubing string to the interval of formation with high-viscosity oil, heating and recovery of heated products by insert bore-hole sucker-rod pumps from well. Prior to lowering heater into well, oil viscosity is determined and content of paraffin substances when viscosity of high-viscosity oil is up to 200 MPa·sucker-rod pump is used for selection of high-viscosity oil, while the content of paraffin substances in high-viscosity oil is more than 10%, chemical solvent of paraffin substances is additionally supplied to well via capillary pipeline. During lowering process electric heater is arranged opposite to formation bottom, and pump - above electric heater, packer is set at a distance of 3 m above the bottom-hole pump suction. Station, feeding the electric heater, is switched on. Bottomhole formation zone is heated for 24 hours, after which the drive of bottom-hole pump is activated with simultaneous dosing of chemical reagent via capillary pipeline to bottom-hole pump suction. During the heated product suction upon increasing load on the drive of bottom-hole pump above permissible value, bottom-hole pump drive is switched off and supply of chemical reagent via capillary pipeline is stopped and reverse flushing of space between the inner wall of production tubing string and stem prior to cleaning. Device for thermal effect on bottomhole formation zone with high-viscosity oil includes well electric heater with current lead installed on lower end of production tubing string plugged from below, packer tightly separating tubing-casing annulus, insert bottom-hole pump, radial holes made in production tubing string. Device at wellhead is equipped with dosing pump connected with capillary pipe lowered into well and secured by clamps on the outer surface of production tubing string together with current lead, herewith insert bottom- hole pump is arranged above electric heater and packer is arranged above the bottom-hole pump, radial holes are made above electric heater in production tubing string, and there is radial duct between radial holes and pump, in which the lower end of capillary pipeline is inserted, upon that check valve is installed as part of tubing string above the packer and passes fluid from annular space to production tubing string.;EFFECT: technical result - possibility of high-viscosity oil extraction with high content of paraffin and asphalt-resinous substances in high-viscosity oil, reduced heat losses.;2 cl, 2 dwg, 1 tbl