Study On Oil Displacement Experiment And Performance Evaluation Of Polymer Surfactant

Polymer surfactant is considerable potential and new-style chemical flooding agent, which has been paid attention to and studied at home and abroad, and has been applied in partial blocks in Daqing oilfield and has obtained better development effectiveness. But because the study of its performances, mechanisms and other aspects is still not perfect enough, and it is difficult to use the existing technological theories to provide accurate explanations for the problems during the field test, it is necessary to carry through further intensive study for the performances, displacement efficiency and swept laws of Haibo polymer surfactant.This paper based on the reservoir engineering theory as the guide, using rheometer and scanning electron microscopy(sem) and indoor physical simulation displacement experiment technology, systematic research on other properties characteristics including the change of wettability, viscoelasticity, injection capacity and pressure conductivity, preferably the injection concentration and injected slug size of Haibo polymer surfactant in the conditions of the main reservoir of Daqing oilfield and in-depth analysis the microcosmic displacement mechanism of Haibo polymer surfactant. This paper according to the main reservoir of Daqing oilfield situation designed the four layer heterogeneous thickness model and two-dimensional inhomogeneous plane physical model and has carried out the research on the enhanced oil recovery situation and the plane and vertical of sweep laws.This paper used the method of laboratory experiment to study the stability, shearing resistance, injectivity, pressure conductivity and other performances of Haibo polymer surfactant, and used the method of lithography glass to analyze the microscopic displacement mechanism for Haibo polymer surfactant, and used the displacement experiments to optimize the injection concentration which was 1000mg/L and the injection slug was 1PV for Haibo polymer surfactant in a class of reservoir in Daqing Oilfield. Aiming at the condition of a class of reservoir in Daqing Oilfield, this paper designed heterogeneous thicken models with four layers and two-dimensional heterogeneous plane physical models, and has used the displacement experiments to obtain the swept laws in portrait and plane for Haibo polymer surfactant.The experiments of heterogeneous thicken models with four layers showed that Haibo polymer surfactant had enlarged the swept volume in low and middle permeability layers, when the injection of Haibo polymer surfactant was 1PV after polymer flooding, the oil recovery could increase by 13.08% and the displacement efficiency was obvious. The experiments of two-dimensional heterogeneous plane physical models showed that there formed oil wall at the stage of Haibo polymer surfactant flooding after polymer flooding, which could increase percolating resistance and enlarge swept volume, thus enhanced oil recovery, the key of enhanced oil recovery for Haibo polymer surfactant was that it employed low and middle permeability layers effectively. When the injection of Haibo polymer surfactant was 1PV after polymer flooding, the oil recovery could increase by 10.89% and the enhanced displacement efficiency was obvious.