Abstract

This chapter discusses huff-n-puff gas injection in shale and tight oil reservoirs. The effects of matrix size, pressure and pressure depletion rate, soaking time, gas composition, diffusion, water saturation, stress-dependent permeability on EOR potential are discussed. The EOR mechanisms are discussed. The minimum miscible pressure in huff-n-puff injection is found to be higher than estimated from the conventional slimtube tests. The gas penetration depth is strongly related to natural fracture density. Some field projects are presented.

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