PetroChina Company Limited
Downhole oil, gas, water and sand separation method and separator

Abstract:

A downhole oil, gas, water and sand separation method and separator (10). The downhole oil, gas, water and sand separation method comprises: step 1: dividing an oil jacket annulus into a plurality of spaces in an outflow direction of produced liquid, wherein each space is provided with an accommodating cavity (21) communicated with the oil jacket annulus; step 2: arranging a plurality of liquid inlet hole groups (11) in a liquid outlet pipeline (1) of the produced liquid in the outflow direction of the produced liquid, wherein each of the liquid inlet hole groups (11) is communicated with one of the accommodating cavities (21); and step 3: separating oil, gas and water after the crude oil in the oil jacket annulus flows into each of the accommodating cavities (21), wherein separated oil drops or bubbles flow back to the oil jacket annulus from the accommodating cavities (21), and separated produced liquid simultaneously flows into the liquid outlet pipeline (1) through the plurality of liquid inlet hole groups (11). The downhole oil, gas, water and sand separation method and separator can realize a rapid downhole oil-water or gas-water separation in the high water-content crude oil.