基于流线的示踪剂技术研究薄层底水油藏开发规律

Study on the development rule of thin reservoirs with bottom water by streamline-based tracer technology

滩海老168块油藏具有河道窄、层薄、普遍存在底水的特点,油井投产即高含水的问题,严重制约了该类油藏的有效开发。在建立老168块地质模型基础上,利用基于流线的示踪剂技术优化生产井网。研究认为:注水井位于河道边部,生产井位于河道中部的"之"字形井网为最佳井网;水平井在该类油藏同样有较好的适用性,开发效果最好的是水平井与河道成45°夹角呈放射状分布的井网;油层射开时不用考虑避射底水,加大油层射开程度,可提高采油速度,缩短开采周期。

The shoal reservoir of the Lao168 block is characterized by narrow channel,thin reservoir and extensive bottom water.Oil wells are high water cut in the beginning of production.These are restrictions on efficient development of the reservoir.The producing pattern has been optimized by using streamline-based tracer technology based on establishment of the geological model of the Lao 168 block.The study shows that the zigzag well pattern with injectors at channel edge and producers in the middle of the channel is the best pattern;horizontal wells are also adaptable to this reservoir,and the best pattern is horizontal wells are arranged in radial distribution at a 45° angle with the channel;it is not required to avoid perforating bottom water layer,the reservoir shall be perforated as much as possible to improve oil recovery rate and shorten recovery cycle.