Experimental Study On Water Seepage And Gas Injection And Seepage Mechanism Of Liuhua 11-1 Reef Limestone Reservoir

The LH 11-1 reservoir is a massive reservoir controlled by the bottom water of the Liuhua 11-1 oilfield.The main target layer of the reservoir is the Upper Reef of the Upper Miocene Zhujiang Formation.It belonging to the medium-high porosity reservoir pore type.Fracture-pore assemblage is the main pore type.The fractures plays a key role in the development of reservoirs,which can improve the production but cause bottom water coning.Due to the complex geological conditions of the reef limestone reservoir,the reservoir development is faced with the problem of bottom water coning and low oil recovery.In order to To improve the effects of reservoir development,The paper studies objects in the limestone rocks of the 11-1 reef limestone reef.Using a full-diameter core that can better restore the reservoir's actual situation,Screening out the core of fracture-pore development,Conduct rock mass analysis,Oil-water phase percolation curve test as well as longitudinal water flooding experiments,Gas injection experiments and other research.On the basis of full understanding about Reservoir watear flooding characteristics and water-producing law,(to)Carry out the study of reservoir water flooding and the mechanism of Gas injection huff and puff,And then put forward the countermeasures to improve the development effectiveness of oil fields.1.The physical properties of the obtained full diameter cores were analyzed,the results show that the pore structure of reef limestone is complex,Microcrack development,and The porosity and permeability of the samples are large2.With different permeability and fracture development as the standard,The relative permeability curves of 8 groups of full diameter cores were measured(3 of which were steady-state method,5 groups were unsteady),Combined with the corresponding theoretical knowledge,comparison of seepage curve characteristics,Analysis of its seepage characteristics.3.Select the whole core of the different layers of the reservoir and perform a longitudinal water flooding experimen.4.Conducted a gas injection experiment.The effect of nitrogen stimulation on water and oil was analyzed.Through the above research,The characteristics of waterflooding in reef limestone reservoirs are further understood Which provided the basis for the corresponding development countermeasures after the oil field.