| In recent years,the oil production rate of major reservoir has been decreaseing progressively, The oil field development object is transfered from major reservoir into poor oil layer.The polymeric surface-active agent flooding is effective technology. Positive results have been got from pilot test in Daqing oilfields in recent years ,but the technical personnel find some problems throngh the mine filed experiment.In oreder to know the flooding mechanization and improve the flooding effect about polymeric surface-active agent in poor oil layer.The paper study the viscosity, rheological property, viscoelasticity, boundary tension, emulsification,flow properties, displacement efficiency and so on, making use of the rheometre,dynamic light scattering, scanning electron microscope and diplacement test and so on,analyzing the flooding mechanization at the same time.The experiment results show that BⅢ polymeric surface-active agent is good at the salt-resistance, stability and viscoelasticity and is poor in the anti- shearing and emulsification stability about the polymeric surface-active agent used in the experiment.The seepage flow of BⅢ polymeric surface-active agent is fit for the development of low permeable layer,when the solution concentration is same. Active group of molecular chain in BⅢ polymeric surface-active agent present surface active nature,it can increace the flooding efficiency compared with other polymeric surface-active agent.When the ionogen concentration is raised,the inaccessible pore volume become reduced and its diversion ability get strengthened.It is found that the molecular configuration of BⅢ polymeric surface-active agent is similar with the gel system,so the molecular clew size become bigger and the rigidity is reinforced.Probability which is captured becomes bigger and the flow drag force is strengthened,so the ability that enlarge swept volume and the amplification of recovery become better than the commom middle molecular polymer. |
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