考虑应力敏感性的低渗透油藏油井产能分析

doi:10.11743/ogg20130117

Abstract

Abstract:

Stress-sensitivity is one of the main factors that affect single well productivity in low-permeability rese-rvoirs.It is common sense that wells tend to produce less after certain volumes of reservoir fluids were recovered as that would cause drop-down in formation pressure,porosity and permeability and increase of effective stress.The authors modified the previous productivity function of low-permeability oil wells that only considers the influences of permeability decrease by incorporating the influences of stress on porosity,established a new stress-sensitive productivity function with both porosity and permeability being taken into consideration,and proposed the concept of productivity-stress-sensitivity index.Along with the intensifying of stress-sensitivity of low-permeability reservoirs and increase of stress-sensitivity constant,the productivity-stress-sensitivity index also enlarges,and daily oil production quickly shrinks.The new function simplifies the calculation process and improves the accuracy.Practices show that the productivity-stress-sensitivity index exerts a strong influence upon the productivity of wells in low-permeability reservoirs.As the index increases,the decreasing of open flow capacity of oil wells slows down.Compared with the old function,the new one reflects better the actual production of low-permeability reservoirs and therefore could be used to guide their development.

Key words: stress sensitivity, productivity, porosity, permeability, low-permeability reservoir

CLC Number:

TE312

Liu Feng, Wang Yuliang, Chen Xiaofan, Su Yunhe, Wang Yue. Analysis on oil well productivity of low-permeability reservoirs with stress-sensitivity being taken into considerations[J]. Oil & Gas Geology, 2013, 34(1): 124-128.

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Analysis on oil well productivity of low-permeability reservoirs with stress-sensitivity being taken into considerations

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