Technical Development Strategies For Igneous Fractured Heavy Oil Reservoirs

Because volcanic fractured heavy oil reservoirs have the characteristics of fractured reservoirs and heavy oil reservoirs,it is necessary to consider the characteristics of conventional heavy oil reservoirs and to consider the influence of natural fractures.In this paper,the viscous viscosity of the target block is large,which covers the dilute oil and heavy oil.Therefore,it is of great significance to study the development of different types of viscous heavy oil reservoirs in volcanic rocks.In this paper,using the reservoir engineering and numerical simulation method,combined with the actual reservoir reservoir fluid parameters,the reasonable technical policy of the volcanic rock fractured heavy oil reservoir was studied.First of all,this paper summarizes the general situation of the exploitation of volcanic rock fractures and the problems encountered in the development process.The horizontal well productivity model of fractured heavy oil reservoirs was established by theoretical method.The calculated horizontal well productivity and the actual well productivity were close to each other,and the sensitivity analysis was carried out for different influencing parameters;Based on the reservoir characteristics of the actual block reverse fault development,the fracture development and the reservoir space type,the actual block double medium geological model is established.The numerical simulation model of double media reservoir was established by CMG software,and the oil recovery mechanism of natural energy,water injection and steam stimulation in volcanic fissured heavy oil reservoir was studied..It is found that steam stimulation should be selected instead of water injection after natural energy mining;Based on the empirical formula of formation crude oil viscosity,a systematic method to calculate the viscosity distribution of crude oil is established by means of reservoir numerical simulation software CMG,which ensures the reliability of numerical simulation of volcanic reservoir reservoirs.According to the viscosity of stratum crude oil,Crude oil viscosity of 100mPa·s and 500mPa·s for the boundaries of the research area will be divided into low viscosity,medium viscosity and high viscosity.Based on the numerical simulation model of low-viscosity,medium-viscosity and high-viscosity reservoirs,the natural energy,water injection and steam stimulation development are studied respectively.The recovery degree of steam stimulation is the highest,the economy of natural energy development is the best and water injection development is the worst.Considering the current oil prices,the natural energy development was recommended.