| In April 2008,great development results had been achieved in experiment using ASP(strong alkaline /surfactant /polymer)flooding at Saertu reservoir III 4-10 in the northeast area of Lamadian oilfield.However,large consume of alkaline and surfactant in reservoir result in a small proportion of the ultra-low interfacial tension wells during the process of water jet using ASP flooding with strong alkalin and had not reached the most ideal effect.Serious sanding production led to obviously fouling in production wells and the ground gathering system.Produced fluid also had difficulty to disposal.Compared with ASP flooding with strong alkaline,ASP flooding with week alkaline have advantages on stronger adaptability to the oil layer,lighter fouling in production wellbore and the ground gathering system.Therefore,the experiment using ASP flooding with week alkaline for developing lower strata at original wells pattern had been developed based on optimal combination of experiment in Putaohua reservoir Ⅱ4-9 in the northeast of Lamadian oilfield.In this paper,geological characteristics of the Class II Reservoirs using ASP flood with weak alkaline in Lamadian oilfield had been detailed described.Sedimentary characteristics and residual oil distribution of experiment area had been confirmed for recognizing the rules of distribution of residual oil during this process.Combined with the data of water Injection wells and core wells,sedimentary microfacies distribution,condition of reservoir development,reservoir heterogeneity and remaining oil distribution can be studied.Theoretical guidance and geological basis can be provided by the design of reasonable parameters,preparation of chemical flooding schemes during the study.It also founded the foundation of theory and practice for further study on spreading the method of ASP flooding with alkaline at the Class II Reservoirs in Lamadian oilfield. |
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