Research On The Combination Of Horizontal With Vertical Well And Injection Parameter Of ASP Flooding For The Unit Of P?3₃ In The Xing 7 Eastern Block

Based on the unit of P?3₃ in the Xing 7 eastern block of Daqing Xingshugang oilfield is a positive rhythm thick sandstone reservoir,the contradiction between the heterogeneity in the layer is prominent,and the long-term water flooding development leads to the enrichment of the remaining oil on the top of the oil layer.This caused the difficulty to exploit the potential of the traditional vertical well water flooding.So the combination of horizontal with vertical well of ASP flooding is carried out to explore the potential remaining oil at the top layer in this paper.The three-dimensional geological model of this block is established using Petrel geological modeling software,and the history of fine water flooding is carried out by means of numerical simulation techniques.The fitting of the main development indicators is in line with the accuracy requirements.The target area of the horizontal well is determined by the distribution of the remaining oil in the plane and the longitudinal direction of the P?3₃ unit.In this paper,the numerical simulation method is used to optimize the well layout plan.The influence of horizontal section loss is considered,and it is worth mentioning that the "heel-finger effect" of the horizontal well is explained from mechanism.Meanwhile,the relevant parameters of horizontal well,such as the length of horizontal well,spacing between the producer-injector horizontal well,the distance between the horizontal wells,the well track and the well spacing between the vertical well and the vertical well are optimized by the concept model and the actual model.The optimized results are that the length of horizontal well is 300 meters,the spacing between the producer-injector horizontal well is 200 meters,and the distance between the horizontal wells is 100 meters.The injection well is deployed in the middle of the thick oil layer,and the production well is deployed on the top of the thick oil layer,the distance between the vertical well and the horizontal well group is 150 m,and the vertical well and the vertical well are the five-point area well pattern with a distance of141 m,the best development effect can be got in this well distribution mode.So the project of the combination of horizontal with vertical well in The unit of P?3₃ in Xing 7 eastern block can be obtained.Meanwhile,the optimization research of injection scheme for the combination of horizontal with vertical well is carried out.During the research process,the development history data of the combination of horizontal with vertical well of ASP flooding in adjacent developed blocks are used for parameter sensitivity analysis,such as the viscosity,residual resistance coefficient and adsorption of polymer,the interfacial tension of surfactant and alkali,the adsorption of surfactant and adsorption of alkali,and the correction range of the above parameters are also given.Based on the development effect and economic evaluation,the optimal scheme of injection parameters and slug combination for ASP flooding in the unit of P?3₃ in Xing 7 eastern block can be obtained:0.06 PV pre-polymer slug?2000mg/L?+0.35 PV three element main slug?2000mg/L P+1.2wt%A+0.3wt%S?+0.20 PV three element auxiliary slug?1600mg/L P+1.0wt%A+0.2wt%S?+0.20 PV subsequent polymer slug?1400mg/L?,it is expected to increase the recovery rate by 23.71 percentage points.In the end,the best scheme of horizontal with vertical well of ASP flooding is obtained,it has a promising future for application in one class oilfield of Xinbei development area.