Horizontal wells are subject to water breakthrough problems caused by natural or hydraulic fractureconnections.Treatment with gelant normally is an effective choice.However,at present,no methods canprovide quantitative guidance for designing gelant treatment in fractured horizontal wells.In this paper,weproposed a fracture-conductivity-based analytical model to guide sizing gelant treatment in hydraulicallyfractured horizontal wells.It includes the evaluation of fracture number intersected with the horizontalwell,calculation of gelant leakoff distance according to the desired water productivity reduction,and themethod to determine optimal gelant volume.The principle for controlling gelant injection and the methodfor forecasting water shutoff performance are also included.The successful application is based on tworequirements:(1)gelant can penetrate a short distance from fracture surface into adjacent matrices;and(2)gelant or gel can reduce permeability to water more than to hydrocarbon.Finally,we summarize a 9-stepprocedure for sizing gelant treatment in fractured horizontal wells.This work provides quantitative guidancefor water shutoff treatment using cross-linked polymer gels that create disproportionate permeabilityreduction.
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