Chemical Formulation Optimization And Scheme Design Of JH31 Block

The JH31 block has entered the high water cut period.The main problems are as follows: First,the contradiction between the layers is more prominent,and there is a large difference in the degree of longitudinal oil reservoir utilization.Second,the oil reservoir is unevenly flooded,the sweep coefficient is low,and the main oil reservoir has a high comprehensive water content.The non-primary oil layer has a lower comprehensive water content.Third,the thickened oil causes the injection water to enter into the tongue and the fingering is severe.The remaining oil distribution is increasingly fragmented,and the conventional water flooding effect deteriorates year by year.In view of the current status of JH31 blocks,deep-displacement flooding technology can mitigate the ineffective cycle of high-permeability layers and effectively develop secondary blocks.Therefore,it is of great significance to carry out deep profile control and flooding on JH31 block.Based on the principle of adjusting the flooding system,this paper uses the appropriate flooding and flooding technology to improve the recovery factor and optimizes the formulation of the flooding and flooding system.Among them,the organochromium cross-linked displacement and flooding system was selected as the displacing agent,and different regulating and flooding systems were designed as the pre-stage slug and the main slug respectively,and a single surfactant flooding was chosen as the flooding system.Evaluation of the flooding effect of the flooding and flooding system revealed that the residual resistance coefficient of the gel system is relatively high,and it has a strong ability to reduce the permeability of the core.The parallel core experiment shows that the system has good diversion capacity and liquid flow steering ability.Using Petrel software to establish the JH31 block geological model,and using CMG STARS software to establish a numerical simulation model.Based on the experience of the mine experiment and the results of the indoor simulation experiment,the injection parameters of the flooding numerical simulation were designed.The simulation of flooding and flooding process was simulated by considering the chemical reaction rate,incommensurable pore volume coefficient,adsorption and residual resistance coefficient.Simulate the effects of polymer concentration,injection volume,and injection time on the control flooding effect to optimize the injection parameters,and finally give the optimal injection schedule.