|
运用流线模型研究裂缝网络对水驱油效果的影响 |
Study on the effect of fracture network on water flooding by streamline model |
投稿时间:2022-11-18 修订日期:2022-11-18 |
DOI: |
中文关键词: 流线模型 DFN裂缝 裂缝方位 裂缝倾角 数值模拟 |
英文关键词: Streamline model DFN fracture fracture orientation fracture dip angle reservoir simulation |
基金项目:国家科技攻关计划 |
|
摘要点击次数: 118 |
全文下载次数: 0 |
中文摘要: |
摘 要:为了研究天然裂缝在水驱油过程中的作用,本文将DFN裂缝网络与流线模型结合进行数值模拟研究,计算流体在裂缝网格中的流动轨迹及时间。通过分析不同裂缝网络不同见水程度所需要的时间和累产油,研究不同方位裂缝和不同倾角裂缝对水驱油效果的影响。研究表明,在其它地质条件相同的情况下,与普通油藏相比,裂缝性油藏相比普通油藏的见水时间早10%,说明裂缝有一定增加“导流能力”的作用,但复杂裂缝网络的存在在一定程度上对驱油效率起积极作用,这取决于裂缝网络交错对流体的“阻挡”作用。裂缝的方位对流体的流动轨迹有较大影响,流体一般沿着裂缝形成的“快速通道”流动,且往往存在飞行时间较长的难动用区域。裂缝方向与注采方向呈一定角度有利于提高驱油效率。与裂缝方位相比,裂缝倾角对水驱油的效率的影响不明显,倾角呈90°时水驱油效率最高。 |
英文摘要: |
Abstract:In order to study the role of natural fractures in the process of water flooding, the DFN fracture network and streamline model are combined to carry out numerical simulation, and the flow trajectory and time of fluid in the fracture grid are calculated. The time and cumulative oil production of different fracture networks with different water breakthrough degree are analyzed, and the water displacement effect of fractures with different orientations and different dip angles is studied. The results show that, under the same geological conditions, the water breakthrough time of fractured reservoir is 10% earlier than that of ordinary reservoir, which indicates that fractures can increase "conductivity" to a certain extent, but the existence of complex fracture network plays a positive role in oil displacement efficiency to a certain extent, which depends on the "blocking" effect of fracture network crisscross on fluid. The orientation of the fracture has a great influence on the flow trajectory of the fluid. The fluid generally flows along the "fast channel" formed by the fracture, and there are often exist some area difficult to produce with long flight time. The angle between fracture direction and injection production direction is helpful to improve oil displacement efficiency. Compared with the fracture orientation, the effect of fracture dip angle on water displacement efficiency is not obvious, and the water displacement efficiency is the highest when the dip angle is 90 degrees. |
View Fulltext
查看/发表评论 下载PDF阅读器 |
关闭 |