Research On Nitrogen Foam Profile Control Technology For Horizontal Well Thermal Recovery In Chunguang Oilfield

Steam stimulation and steam drive are the main methods for thermal recovery of heavy oil reservoirs.As a replacement technology in the late stage of steam stimulation,Steam flooding has been widely used in oil field.After a period of mining,the effective utilization of heat has reduced.This paper studies the development effect of nitrogen foam profile control on the late stage of steam flooding.First,evaluate the performance of different blowing agents and select the most suitable foaming agent.Then study on how to enhance oil recovery by the technology of nitrogen foam profile control in the way of physical simulation and numerical simulation method.On the performance evaluation of blowing agent,by measuring the volume and half-life of blowing agent under different conditions to select out the blowing agent with the best static property to evaluate the sealing performance,and then measure the resistance factor and residual resistance factor,after that we can choose the best blowing agent to do the subsequent research.From the three physical simulation experiments,we carried out the mechanism research of enhanced oil recovery by using nitrogen foam in two-stage parallel sand-filled tubes model,visualization model and three-dimensiona l physical model,respectively.Observe the displacement characteristics of the visual model and analyze the plugging effect of nitrogen foam for steam channeling.In the three dimensional physical model,analyze the development of temperature field and get the comprehensive effect of nitrogen foam in horizontal well pattern.Finally,according to the Chunguang Oilfield Block feature,build a conceptual model of horizontal wells by numerical simulation technology and optimize the injection methods and parameters of nitrogen foam in order to provide reference value for similar heavy oil reservoir.