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自流注水是指流体从一个地层被引流到另一个地层,以保持油藏压力的一种技术。该技术已在科威特应用了多年,油井通常要钻穿一个含水层和一个储油层,在条件合适和含水层压力较高的情况下,大量的水从含水层流至储油层。在油藏开发后期,因不可控制的压力补充方式给油藏管理带来很多难题,而且随着油藏压力下降,含水层和油层之间的压差增大,射孔时,压降下降过快,流量过高,导致含水层碎屑基岩不稳定。2007年初,科威特西部油田采用智能井工艺完成一口可控制自流注水井,提高了用自流注水工艺维持压力平衡的油藏管理能力。本文介绍了科威特智能井在自流注水井中的安装原理、设计及数据分析。
Artesian flow is a technique by which fluids are diverted from one formation to another to maintain reservoir pressure. This technique has been applied in Kuwait for many years. The well usually dries through an aquifer and a reservoir. Large amounts of water flow from the aquifer to the reservoir when the conditions are right and the aquifer is under high pressure. In the late stage of reservoir development, uncontrollable pressure replenishment poses many problems for reservoir management. As the reservoir pressure decreases, the pressure difference between the aquifer and the reservoir layer increases. When the pressure drops during perforation, Fast, high flow rates lead to instability of aquifer clastic bedrock. In early 2007, Kuwait’s West Oilfield completed a well-controlled gravity injection well using smart well technology and enhanced its reservoir management capability to maintain pressure balance by gravity injection. This paper introduces the installation principle, design and data analysis of Kuwait smart wells in gravity flow injection wells.