DOWNHOLE SEPARATOR FOR SEPARATING WATER AND GAS AND OIL MIXTURE Russian patent published in 2013 - IPC E21B43/38 

FIELD: oil and gas industry.

SUBSTANCE: downhole separator for separating water and gas and oil mixture includes stepped tubing string with electric submersible pump. It includes separating chamber, through channel for oil and inlet holes for water. As separating chamber it contains tubing string of larger diameter. Inside the tubing string of larger diameter there is a short tubing string of smaller diameter. The tubing strings of smaller diameter are located near the mouth at the area of well bore with inclination angle more than 3 degrees. Note that the tubing string of smaller diameter is equipped with a shank plugged from the bottom end with two rows of inlet holes along the whole length for water supply. The shank is connected to it by high pressure sleeve. The shank from the holes side is located at the bottom forming internal surface and at the distance from the bottom end of the tubing string of larger diameter.

EFFECT: separation and extraction of small volumes of oil from large volumes of water due to process performance in inclined area of the well.

2 dwg