FIELD: measurement technology.
SUBSTANCE: invention relates to methods of determining saturation pressure of oil with gas Psat in downhole zone. Method consists in successive reduction of pressure in gas-liquid composition of well and analysis of change of pressure difference between two points of well. At that, two subsurface small-sized pressure gauges (pressure gage) are lowered to the bottomhole pump on the logging geophysical cable with feedback at the fixed distance from each other, after stabilization of operation mode of "formation-well-pump" system, pressure gauges are lifted with low vertical speed and at beginning of reduction of graph of dependence of pressure difference in zone of two pressure gauges (sensors) from their average value there is found required value – Psat.
EFFECT: development of method for determination of oil saturation pressure by gas without preliminary evaluation of pressure at well head in IS and liquid level.
1 cl, 2 dwg
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