Research On Mechanical Water Blocking Technology Of Chang 6 Reservoir In HS Oilfield

Chang 6 of HS oilfield belongs to ultra-low permeability reservoir.As an important means of effective development of low-ultra-low permeability reservoir,the application of horizontal wells in HS oilfield is gradually expanding.However,horizontal wells in this kind of reservoir have the characteristics of high single well production and difficult water flooding control.With the further development of the oil field,the water emergence risk of the oil well increases year by year due to the influence of injection water fracture communication and water channelling in adjacent wells and the gradual advance of the water line.The problem of high water cut is faced in the development of horizontal wells,resulting in the inability to effectively use the controlled reserves,increasing the power consumption of the mechanical recovery system and the cost of dehydration.In this paper,the main factors affecting horizontal well water recovery are analyzed in view of the difficult treatment of horizontal well water flooding in HS oilfield.Study the direction of incoming water,the rule of incoming water,summarize the understanding of incoming water,constantly analyze the differences and common points of incoming water factors in different blocks and reservoirs,and put forward the identification of incoming water direction and dominant channel based on the data such as the mining status diagram,cementing quality diagram and well group mining curve.Starting from the risk of sticking in late drilling,and whether the drilling can be quickly milling after sticking,the mechanical method suitable for HS oil field water plugging was studied,and the tool and string were optimized to realize rapid and effective sticking,which was used for field practice and evaluation effect.It is expected that the high water cut horizontal well of HS oilfield can be used to control the water cut of HS oilfield horizontal well,so as to further improve the utilization of reserves and provide support for water control and oil stability of horizontal well in old oilfield.