Research On Combination Of Horizontal Wells-Vertical Wells And Comprehensive Adjustment Of Water Injection Measures In B Well Area Of Aonan Oilfield

In the middle and later period of oil development and production,the rational development of remaining oil plays an important role in improving the oil field production.Aiming at the problems of Aonan B well area,such as fault shielding,imperfect injection production relationship and poor development effect of vertical wells,in order to improve the development effect of this well area and increase the crude oil production,this paper develops the straight joint well layout and water injection parameters of Aonan B well area Optimization research.First of all,taking Aonan oilfield well B area as the research object,using the geological data and 24 well location information in the research area,the structural model,fault model,sedimentary facies model and attribute model are established by three-dimensional geological modeling,and the grid precision is coarsened from 20 × 20 m to 30 × 30 m by model coarsening,on the basis of retaining the model framework and flow response,which is provided for numerical simulation Secondly,the three-dimensional geological model is introduced into the numerical simulation software to complete the whole area and single well fitting by combining the basic parameters of the reservoir with the production well history.Through the historical fitting,the fitting error of the whole area and single well is within 5%.Then,the remaining oil genesis analysis and the qualitative and quantitative description of the remaining oil are completed by analyzing the remaining oil saturation distribution map and the reserve zoning data,and the remaining oil is described according to the remaining oil According to the distribution situation,the potential tapping measures of flat joint well distribution(infilling horizontal well),oil well injection and periodic water injection are formulated;then,by establishing an ideal model,the influence of parameters such as length of horizontal well,perforation interval,injection production interval and matching number of vertical horizontal wells on the recovery degree is studied,and the parameters of flat joint well distribution are determined;finally,the Based on the comprehensive adjustment of water injection measures,the optimal time of reinjection matching two vertical wells and four vertical wells around horizontal wells is selected as synchronous reinjection by theoretical model,the reasonable injection production ratio is determined as 2.8 by material balance theory combined with logistic cycle model and considering invalid water injection factors,and the reasonable cycle isdetermined by reservoir engineering formula combined with numerical simulation method based on periodic water injection theory The water injection plan of phase I is open in February and close in March.According to the prediction of 10 years' production,the recovery degree of well block B in Aonan oilfield has increased by 25.5%.This kind of development mode combined with flat and flat well arrangement and periodic water injection provides a new idea for the remaining oil potential tapping measures of low permeability oilfield and a useful reference for improving the development effect of low permeability oilfield.