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根据达西定律,在油砂油藏中,控制沥青重力驱动流速的主要因素是原油的流度,即原油有效渗透率与粘度的比值。原油的有效渗透率由绝对渗透率和原油的相对渗透率控制,而后者又取决于油相饱和度。原油的粘度由温度和组成控制,二者则取决于溶解气含量、储层地质、地层能量补入速率、轻组分的生物降解及扩散作用。绝对渗透率、相对渗透率、流体饱和度及组成,在油砂油藏的垂向和横向上均表现各向异性。目前热力采油过程通常都用直井,例如蒸汽辅助重力泄油,但直井虽然利于钻井和设计,却没有优化原油的流度分布,本文研究了针对各向异性油藏的蒸汽辅助重力泄油的最优井眼轨迹。该研究表明,最优井眼轨迹不一定是直井,而且注入井和生产井也不一定要平行。
According to Darcy’s law, the main factor controlling the gravity-driven flow rate of asphalt in oil and gas reservoirs is the crude oil flow, which is the ratio of effective crude oil permeability to viscosity. The effective permeability of crude oil is controlled by the absolute permeability and the relative permeability of crude oil, which in turn depends on the oil saturation. Crude oil viscosity is controlled by temperature and composition, and both depend on dissolved gas content, reservoir geology, formation recharge rate, biodegradation and diffusion of light components. Absolute permeability, relative permeability, fluid saturation, and composition all show anisotropy both vertically and horizontally in the oil and gas reservoir. At present, vertical wells, such as steam-assisted gravitational drainage, are usually used in thermal oil production. However, vertical wells, while favorable to drilling and design, do not optimize the distribution of crude oil flow. In this paper, Finebore trajectory. The study shows that the optimal wellbore trajectory is not necessarily a vertical well, and that an injection well and a production well are not necessarily parallel.