METHOD OF WATER-PRODUCING OIL WELL OPERATION Russian patent published in 2014 - IPC E21B43/00 

FIELD: oil and gas industry.

SUBSTANCE: method includes preliminary determination of liquid level in the oil, drilling of an offshoot from the parent hole, setting of a cement plug in the parent hole below the kick-off, cementing of the water-flooded bottomhole in the parent hole at the productive strata level and placing a downhole-pumping equipment at the bottomhole with further oil extraction. In order to ensure break of the stream and to increase efficiency of gas separation, after determination of the liquid level in the well, cementing of the water-flooded bottomhole in the parent hole at the productive strata level, setting of a temporary cement plug in the parent hole, drilling of the offshoot from the parent hole above the liquid dynamic head in the well are performed step-by-step. At that heat transfer from the well walls is reduced additionally to the downhole-pumping equipment by means of manufacture of barrel-shaped four-bladed centralisers of material with low thermal conductivity.

EFFECT: improving efficiency of the method due to more efficient gas separation, cooling of the formation fluid inflowing to the pump suction and due to exclusion of the offshoot contamination with cement slurry.

1 ex, 2 dwg