Study On The Well Pattern Optimization Of Radial Water Jet Drilling In Low Permeability Reservoirs

There are many wells which have low production and efficiency in low permeability oil fields,and in the current development situation,the governance effect of conventional measures including fracture acidizing is not obvious.The governance potential is also small.Radial water jet drilling technology is a kind of hydraulic perforating,which can greatly improve the penetration depth.It can drill by given direction in target layer,and improve the formation permeability,so the flow resistance around the wellbore region can be reduced.Finally achieve the goal of oil well stimulation and water well augmented injection,so the research about radial water jet drilling technology and well adapted to network optimization is of great significance.This paper adopted the numerical simulation technology to study the flow characteristics after radial water jet drilling,on the basis of the radial water jet flow characteristics,using the Green function,the product of Newman and the superposition principle of potential,deduced the production capacity formula of single well,and analyzed the mechanistic of increasing production and augmenting injection.Study the influence and Policy limits of geological factors,development factors,the design parameters of radial water jet drilling.Determining the technical limit well spacing and economic limit well spacing,according to the matching model of radial water jet and well pattern,optimize and determine the optimum well pattern matching mode.Through the study,we find that the radial water jet drilling can reduce the pressure drop and change radial flow to the linear flow.It can also increase effective formation permeability and effective coefficient of well pattern.The angle between drilling and well drainage is 0 in five point well pattern.The angle between drilling and well drainage is 45 in nine point well pattern.The research results of this paper give reliable technical guidance for the application of radial water jet drilling in low permeability reservoir in the future.