辽河油田坨33块氮气泡沫驱现场应用

发布时间：2018-08-29 09:22

【摘要】：世界石油开采的发展趋势是:地层结构简单、原油分布广、储存量大、产量高的油田会较早的进入开采中后期,而地层结构复杂、渗透低的油田开采困难且缓慢,最终导致其在油田开发中所占比重愈来愈大。目前,油田在注水开发的过程中,由于油层的非均质性,使注入水及边水、底水沿高渗透层部位不均匀地推进,在纵向上形成单层突进,在横向上形成舌进,造成注入水提前突破,致使油井过早出水,甚至水淹,从而使低渗透部位不能发挥作用,降低了原油的采收率。为了让这些开采困难的油田剩余油储量能够得到更有效的开发,实现油田增产,降低成本,提高开发效益,就必须提高注入流体的波及效率,提高剩余油动用程度。而氮气泡沫驱技术,就是一项以提高波及体积为主,增加洗油效率为辅,提高采收率为主要目标的新技术。它是在注入前置段塞调整油层吸水剖面的基础上,再注入后续段塞启动残余油,达到既“调”又“驱”的双重作用。吸水剖面的改善可扩大后续段塞的波及体积,后续段塞又可大大降低残余油饱和度,提高驱油效率,最终达到提高采收率的目的。本文针对辽河油田高升采油厂坨33块出现了部分油水井水窜现象,含水上升较快,采油速度降低,累积注采比较低,地层能量持续下降,注水井井口压力持续升高,注水压力接近裂缝延伸压力,存在提高注水能力较困难等难题。为解决上述存在的问题,进行了坨33块油藏氮气泡沫驱矿场试验。
[Abstract]:The development trend of world petroleum exploitation is: the formation structure is simple, the crude oil distribution is wide, the storage quantity is large, the oil field with high production will enter the middle and late stage of production earlier, and the formation structure is complex, the oil field with low permeability is difficult and slow to develop. Finally, it accounts for more and more in oilfield development. At present, in the process of water injection development, due to the heterogeneity of the reservoir, the injected water and the edge water and the bottom water are pushed unevenly along the high permeability zone, forming a single layer protruding in the longitudinal direction and the tongue entering in the transverse direction. It causes the injection water to break ahead of time, causes the oil well to leave the water too early, even water flooded, thus makes the low permeability position unable to play its role, and reduces the oil recovery factor. In order for these remaining oil reserves to be developed more effectively, to increase oil production, to reduce costs and to improve development efficiency, it is necessary to improve the sweep efficiency of injected fluid and increase the degree of remaining oil production. The technology of nitrogen foam flooding is a new technology, which is mainly aimed at increasing sweep volume, increasing oil washing efficiency and improving oil recovery. It is based on adjusting the water absorption profile of the reservoir by the pre-injection slug, and then injecting the residual oil into the subsequent slug to achieve the dual function of "regulating" and "driving". The improvement of water absorption profile can enlarge the sweep volume of the subsequent slug, and the subsequent slug can greatly reduce the residual oil saturation, improve the oil displacement efficiency, and finally achieve the purpose of increasing oil recovery. In this paper, some oil and water well water channeling appears in Tuo33 block of Gaisheng Oil production Plant in Liaohe Oilfield. The water cut rises rapidly, the oil recovery rate decreases, the cumulative injection and production rate is lower, the formation energy continues to decrease, and the wellhead pressure of water injection wells increases continuously. The water injection pressure is close to the fracture extension pressure, so it is difficult to improve the water injection capacity. In order to solve the above problems, the field test of nitrogen foam flooding in Tuo 33 reservoir was carried out.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.46

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