Researches on Improving Sweep Efficiency After Water Breakthrough in#br#
Ultra-low Permeability Heterogeneous Reservoir

doi:10.11885/j.issn.1674-5086.2014.04.13.02

Abstract

Abstract:

Focusing on the water channeling and the bad results of profile control in ultra-low permeability reservoir，the
laboratory simulation experiments were conducted to study the anti-channeling and expanding sweep volume methods. The
experiments of profile control and oil displacement were run in the reservoir models with interlayer heterogeneity，which shows
that，the water injection pressure after profile control is higher than that in mid-high permeability reservoir，and it is difficult to
improve the sweep efficiency in ultra-low permeability reservoir. Gas flows along water channeling path when injected directly
after water flooding. Injecting gas after profile control can not only reduce the subsequent injection pressure but also improve
the recovery by about 7.8%. The recovery can be improved by about 9.6% in the intermittent gas injection process after gas
flooding. Therefore，injecting gas after profile control can be used after water channeling in ultra-low permeability reservoir to
effectively expand sweep volume and improve the recovery.

Key words: ultra-low permeability reservoir, water channeling, profile control, natural gas flooding, intermittent gas injection,
sweep efficiency

CLC Number:

TE357

WANG Wei1*, YANG Hui2, HUANG Chunxia1, JIANG Shaojing1, YUE Xiangan3. Researches on Improving Sweep Efficiency After Water Breakthrough in#br# Ultra-low Permeability Heterogeneous Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.04.13.02.

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Researches on Improving Sweep Efficiency After Water Breakthrough in#br# Ultra-low Permeability Heterogeneous Reservoir

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