Water Flooding Fules And Controlling Measures For Different Types Of Fracture And Cave Structures In Carbonate Reservoirs

The fracture-cavity carbonate reservoirs in Tahe Oilfield are extremely heterogeneous,with deep burial depth and diverse reservoir space.In the development,there are different types of fracture-hole structures,and the flooding characteristics and laws of natural water flooding and artificial water flooding are unclear,and the water control techniques under different types of fracture-hole structures lack specificity.This paper carries out the following research based on the existing problems:Investigating the flooding laws of major types of reservoirs at home and abroad,combined with the characteristics of carbonate fracture-cavity reservoirs,a computational fluid dynamics numerical simulation method based on computational fluid software CFX and a physical model-based physical model simulation method are proposed.A research method for flooding law of carbonate fractured reservoirs;By analyzing the statistical summary and other methods,the water cut characteristics and flooding characteristics of the actual three different karst geological background fracture-cavity reservoirs under natural water flooding and artificial water flooding energy are clarified,which provides practical information for subsequent numerical simulation and physical model test.Basis and reference;According to the actual karst background,the fractured hole structure is used to describe three typical fracture-cavity models,including weathering crust karst model,off-control karst model and karst dark river model,and design two kinds of energy replenishment methods including natural water flooding and artificial water flooding.The numerical simulation and physical simulation schemes of the factors affecting natural water flooding and the factors affecting the water flooding of 6 workers are used to study the flooding laws of diff-erent fracture tunnel structures under different water flooding energy and influencing factors;Distribution characteristics and influencing factors of remaining oil after flooding;Based on the distribution characteristics of remaining oil after waterflooding and the factors affecting the remaining oil distribution,the water control methods in different waterflooding stages were proposed and the effect analysis was carried out.The water control effect was obvious.Five water control technologies were proposed including adjustment of injection and production work system.The adjustment of injection-production relationship,adjustment of injection and production methods,water shut-off and gas injection methods,physical model and digital-analog verification water control technology are more reliable,so the proposed water-control measures for fracture-cavity reservoirs.In this thesis,the combination of numerical simulation and physical simulation is used to study the flooding law of natural water flooding and artificial water flooding under different types of fracture-cavity structures,and combined with the actual situation,the reasonable water control technical countermeasures for different fracture-cavity reservoirs are proposed.Provide important technical guidance and theoretical support for improving reservoir development and efficient development of such reservoirs.