Potential Analysis Of CO₂-Steam Flooding With Horizontal Well In Extra Heavy Oil Reservoir

With the increasing demand for the global resources,horizontal well with themal recovery displayes great potential,so analyzing the potential of the CO₂-steam flooding with horizontal well is of signality.But it lacks the screening standard and the heat radius calculation doesn't consider the reservoir heterogeneity until now.So the paper analyze the potential of CO₂-steam flooding with horizontal well from these aspects.First of all,compared the suitable thermal recovery technologies for extra-heavy oil reservoir,we know that CO₂-steam flooding with horizontal well is the most perfect technique.Then we try to understand the driving mechanism from the factorts such as: the horizontal well,CO₂,steam and synergy and so on.Secondly,this paper applies the fuzzy comprehensive evaluation method in reservoir screening work,using numerical simulation technology,analyzed the effective thickness,permeability,oil viscosity and all kinds of geologic parameter sensitivity.On this basis,we draw the membership functions of these six parameters.Use VB language to calculate the normalized evaluation matrix R.According to the thought of fitting,applying the analytic hierarchy process to gain the expert-scoring,fine-tune the matrix for many times until it match the numerical simulation research,and then we get a more objective quantitative weight set X.Thirdly,we calculate the heating radius of horizontal well on the premise of heterogeneity,in order to determine the turning time and the well space.Fourthly,the paper calculates and contrasts some sensitivity factors,for example,the type of well pattern,the well parameters,and injection parameters.Finally we use the new method to select the extra-heavy oil reservoir,design reservoir engineering projects,and predict the recovery.It proves that the fuzzy method is a combination of multiple development factors,can reflect real development.So we can likely to reduce the risk of steam flooding candidate reservoir screening and the method which has a certain application prospect is easy to operate too.