缝洞型碳酸盐岩油藏水驱油微观实验模拟研究——以塔河油田为例

MICROCOSMIC EXPERIMENT MODELING ON WATER-DRIVEN-OIL MECHANISM IN FRACTURED-VUGGY RESERVOIRS

李江龙 陈志海 高树生

Li Jianglong Chen Zhihai Gao Shusheng

中国科学院, 渗流流体力学研究所, 河北, 廊坊, 065001 2. 中国石油化工股份有限公司, 石油勘探开发研究院, 北京, 100083 3. 中国科学院, 渗流流体力学研究所, 河北, 廊坊, 065001

Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang, Hebei 065001, China 2. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China

塔里木盆地塔河油田属于缝洞型碳酸盐岩油藏,古岩溶作用形成的溶蚀孔洞和大型洞穴为油气主要储集空间,构造缝和溶蚀缝为主要流动通道。借助光蚀刻微观玻璃平面模型研究其水驱油微观机理。实验表明:中小规模溶洞内水驱油会发生"水油交互"或"活塞式"平面推进;较大规模溶洞内因重力驱出现"活塞式"纵向推进;裂缝内水驱油出现前缘跳跃、卡断、分段运移与优势路径等流动形式。水驱后残余油分布形式有连续型和分散型:连续型剩余油包括"盲肠状"洞内剩余油和与主流道方向正交裂缝内剩余油;分散型剩余油包括段塞状、膜状、油滴状和角状等分布形式。据此分析了塔河油田油井生产动态的不稳定现象,提出了此类油藏注水开发对策。

Fractured-vuggy carbonate reservoir on behalf of the Tahe Oilfield in Tarim Basin is one of special reservoir types,where eroded holes and large cavities are main store space for oil and gas,and structure fracture and eroded fracture is the main flow path for fluid.By means of light-eroded microcosmic glass plane model,water-driven-oil mechanics in the type of reservoirs is studied.The experimental results show that water-oil mutual phase or "piston-driven pattern" for plane drive can exist in the process of water-driven-oil in medium or smaller-scale cavities,and only "piston-driven pattern" for vertical drive can exist in large-scale cavities,and there are many styles of movement in fractures including front-skipping,block-breaking,subsection-moving and dominant path flow.Residual oil distribution styles are divided into continuous phase type and separate phase type.Continuous phase types include "cecum style" residual oil in vugs or remaining oil in orthodoxy fractures with main flow paths.Separate phase types include segment shape,film shape,drop shape,horn shape.Based on the above,the unsteady phenomenon on the well production is analyzed by microcosmic flow mechanism,and countermeasures are provided for water-flooding in the type of reservoirs.

中国石化开发项目“塔河油田奥陶系缝洞型油藏开发技术政策研究”(P03093)

https://doi.org/10.11781/sysydz200906637