2006•Special Oil & Gas ReservoirsRequires access

Starting pressure gradient calculation and its application in conventional heavy oil reservoir

Jiafeng Xu

Abstract

The calculation method of microcosmic starting pressure gradient is put forward based on the model of pipe flowing and rheological behaviour of conventional heavy oil.Displacement experiments were carried out by using 18 cores of different permeability from the middle of Bohai oilfield.Regression analysis of the experiment data has provided the relationship between starting pressure gradient and average reservoir permeability of conventional heavy oils with different viscosity.Starting pressure gradient chart is also provided.This method can be used for conventional heavy oil reservoir to calculate ultimate drainage radius and reasonable well spacing through starting pressure gradient.

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Key concepts: Pressure gradient, Petroleum engineering, Displacement (psychology), Oil viscosity, Permeability (electromagnetism), Geology, Oil well, Chart