Evaluation For The Properties Of Surface Active Polymer And Study On Its Displacement Efficiency

In this paper,the rheological property and the injection property of the new surfactant polymer were studied in the natural porous medium by means of instrumental analysis and the experimental method.We have conducted the single-tube oil displacement experiment and stereo oil displacement experiment respectively on the artificial heterogeneous cores,and have tested the enhanced oil recovery effect of the new surfactant polymer in the medium to low permeability reservoir.Meanwhile,the microscopic oil displacement mechanism of the new surfactant polymer is researched by using the visualized micro pore model.The main results of testing research are as follows:1.By testing the viscosity,viscoelasticity and interfacial activity of all kinds of surfactant polymer,we have found the influence law of mechanical shear and core shear on the surfactant polymer.2.By the microcosmic study of surfactant polymer distribution form in solution,we have found that four kinds of polymer can form a three-dimensional supramolecular network in solution.When it is sheared,the molecular network structure still exist,but the network structure is partially broken down,and it has become sparse or irregular,and the size of reticulate is inhomogeneous.3.Results of static and dynamic state adsorption study on surfactant polymer in natural cores show that: the adsorption of four kinds of polymer accords with Langmuir Adsorption.All kinds of polymer exhibits the different retention law in high,medium and low cores,and the amount of adsorption and retention is becoming bigger when the permeability of core is s becoming lower.4.One-dimensional heterogeneous cores oil-displacement experiments show that: under the same experiment condition and the equal viscosity condition,the incremental oil recovery of these three kinds of surfactant polymer increased by 7%,2.5% and 1.5% respectively compared with the normal polymer.5.Oil-displacement experiments in the tri-dimensional model show that: the oil recovery of No.2 is 2.33% than No.1.