Trilinear-flow Model of Fractured Well on Asymmetric Regions for#br#
Low-Permeability Reservoir

doi:10.11885/j.issn.1674-5086.2013.06.14.02

Abstract

Abstract:

A trilinear-flow model of fractured well on asymmetric regions for low-permeability reservoir is established. Different
fromthe traditional model，the new model takes into account more complex conditions：the impact of threshold pressure
gradient and multiple asymmetric boundaries. The model is solved using Laplace transformation，and the bottom pressure in
the Laplace space is obtained. Type curves of well test are programmed and plotted by the numerical conversion. The type
curves of the new model are obviously different from the traditional one. The differences are as follows：the curves of dimensionless
pressure and pressure derivation climb up at the later stage because of the threshold pressure gradient，and the greater
the threshold gradient is the earlier and higher the curves climb up；the number of boundaries on asymmetric regions and the
relative positions（vertical or parallel）of fracturing fractures and boundaries have a remarkable influence on the typical curves
with low-permeability wells with vertical fractures. The more boundaries there are，the higher the curves climb up，and under
the same circumstances（with the same boundary types and the same dimensionless boundary distance），significant differences
exist on the curves of boundary response different relative position（vertical or parallel）

Key words: fractured well, threshold pressure gradient, asymmetric regions, well testing, type curve

CLC Number:

TE353

JIA Yonglu1, DENG Qi1*, NIE Renshi1, CAI Mingjin2, WANG Yicheng3. Trilinear-flow Model of Fractured Well on Asymmetric Regions for#br# Low-Permeability Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.06.14.02.

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Trilinear-flow Model of Fractured Well on Asymmetric Regions for#br# Low-Permeability Reservoir

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