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|1. (WO2018141199) METHOD FOR SEPARATING UNDERGROUND OIL, GAS, WATER AND SAND AND SEPARATOR|
|Applicants:||PETROCHINA COMPANY LIMITED
DAQING OILFIELD CO., LTD
|Title:||METHOD FOR SEPARATING UNDERGROUND OIL, GAS, WATER AND SAND AND SEPARATOR|
A method for separating underground oil, gas, water and sand and a separator (10), the method for separating underground oil, gas, water and sand comprising the following steps: step 1: forming a plurality of spaces by partitioning in the outflow direction of extracted liquid in an oil sleeve annulus, and providing an accommodating cavity communicating with the oil sleeve annulus in each space (21); step 2: forming a plurality of liquid inlet hole sets (11) on a drainpipe (1) of the extracted liquid along the outflow direction of the extracted liquid, each liquid inlet hole set (11) correspondingly communicating with an accommodating cavity (21); and step 3: separating oil, gas and water after crude oil in the oil sleeve annulus flows into each accommodating cavity (21), separated oil drops or gas bubbles flowing back to the oil sleeve annulus from the accommodating cavities (21), and the separated extracted liquid simultaneously flowing into the drainpipe (1) from the plurality of liquid inlet hole sets (11). With the method for separating underground oil, gas, water and sand and the separator, rapid separation of oil and water or gas and water in high water content crude oil underground may be achieved.