| 摘要 |
The present invention relates to a microorganism for oil displacement, a composite oil displacement agent containing the microorganism and a preparation method thereof. The microorganism for oil displacement contains the following main components: 20 to 40% of microorganism, 6 to 30% of surfactant, 5 to 10% of macromolecular modifier, 1 to 5% of viscosity reducer, 1 to 5% of additive and the balance of water. The preparation method comprises the steps of in proportion by weight, adding the microorganism, the surfactant, the macromolecular modifier, the viscosity reducer, the additive and the water to a reactor provided with a stirring device, and stirring the components for 1.5 to 2 h at room temperature to obtain the finished product. According to the invention, the microorganism and the surfactant composite oil displacement agent are prepared based on the mechanism of intermolecular interaction of the surfactant of a plurality of association and active components with complementary structure and good compatibility, and the system has high temperature and salt resistance, is capable of reducing viscosity of crude oil and oil-water interfacial tension, meets the demand of environmental protection, is suitable for oil recovery and can enhance the recovery rate of crude oil remarkably. |
