关键词: 缝洞型碳酸盐岩油藏, 储集空间, 物理模拟模型, 底水水锥机理, 油井含水率, 实验研究

Abstract:

According to the characteristic space of karstic-fractured carbonate reservoir and the similarity theory of hydrokinetics,the physical laboratory models for different reservoir space were constructed and used to study the coning mechanism of bottom water flowing in the different flow conduits and its effect on well water cut.The existence style of residual oil in karstic-fractured reservoirs was investigated.The physical models of reservoir space include three types of cave,fracture-cave and fracture.The experiments were implemented on the visual cave model for observation of water coning process.The digital images at specific time intervals were recorded.The other two models were filled with carbonate rock fragments and glass pipes to simulate the reservoir spaces.The low-pressure sensors were used to measure the pressure gradients of fluid flow process in the models.A partial auto-collecting vessel was used to measure fluid flow rate and water cut.

Key words: karstic-fractured carbonate reservoir, reservoir space, physical simulation model, bottom water coning mechanism, water cut, experimental study