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采用饱和水、玻璃珠充填的直玻璃管为模型,通过底部注入、顶部采出的方式分别进行油气二次运移物理模拟实验,模拟石油和天然气的二次运移过程。结果表明,原油的二次运移分为活塞式和优势式2个运移阶段;天然气的二次运移是一种断续式运移,也主要包括活塞式和优势式2种基本运移方式。结合油、气、水物理化学性质分析,探讨了油气二次运移过程的差异,认为石油和天然气自身属性的差异导致其二次运移过程不同。原油二次运移过程中不仅会驱替岩石孔隙中的自由水,而且会置换岩石表面的吸附水,可以与孔隙岩石形成稳定的作用关系,因此原油二次运移过程的阶段性比较明显;天然气与地层水密度差异较大,导致二次运移的动力——浮力较强,而且天然气不能改变孔隙岩石的润湿性,因此运移比较活跃,形成与原油二次运移明显不同的断续式运移。
The saturated glass and water glass filled straight glass tube were taken as the model. The physical simulation experiments of secondary migration of oil and gas were carried out by bottom injection and top extraction respectively to simulate the secondary migration process of oil and natural gas. The results show that the secondary migration of crude oil is divided into two stages of piston and dominant migration. The secondary migration of natural gas is a kind of intermittent migration, which mainly includes two kinds of basic displacement the way. Based on the physical and chemical properties of oil, gas and water, the differences in the secondary migration of oil and gas are discussed. The differences in the properties of petroleum and natural gas lead to different secondary migration processes. The secondary migration of crude oil will not only displace the free water in the rock pores, but also displace the adsorbed water on the rock surface and form a stable interaction with the pore rock. Therefore, the stage of the secondary migration of crude oil is obvious. Natural gas and formation water density difference between the larger, leading to the second motive force - buoyancy strong, and natural gas can not change the pore rock wettability, so the migration is relatively active, and the formation of secondary migration significantly different from crude oil Continued transport.