Research On In-Situ Electrical Heating Development Of Oil Shale Reservoir By Numerical Simulation

Shale oil resource is abundant about trillion tons in our country,after the United States,Brazil and Russia,and can produce about ten billion tons of shale oil.The shale oil development in United States and other countries has entered a block mining commercialization stage and the main mining method is the horizontal well staged fracturing.However,the development of shale oil in our country is still in the stage of field testing,not a lot of production.But increasingly tense of energy supply and demanding relation highlights the necessity of development of shale oil.According to the experiment and calculation data in shale oil development of electric heating in situ at home and abroad.The characteristics of shale oil reservoirs and changing laws of shale oil reservoir parameters changing with the temperature are analyzed.Then the shale oil electro-thermal conversion mathematical model of single well electric heating are established,such as the temperature field mathematical model,and mathematical model of production and other development index.On the basis of the mathematical models for single well,by using superposition principle,the mathematical model of temperature field and production for two wells heating are made.Finally,the economic evaluation mathematical model for shale oil development is established.Using the mathematical model,the single and double well electric heating in actual temperature distribution and production of shale reservoirs is simulated,and the factors affecting the sensitivity of the shale oil mining,such as heating power,oil content,reservoir thickness,heat transfer coefficient of reservoir and well spacing are analyzed to the influence of the temperature field and the output.Finally,the economic evaluation on the shale oil production is made.Calculation shows that when the heating power is 1000 kw,the oil produces after four months,then the oil production increases.For single well different heating power(1000 kw,750 kw,500 kw),the maximum productions are 17.5t/d,13.8 t/d t/d and 3.3 t/d,showing that the bigger the heating power,the higher the oil well production.For oil content,reservoir thickness and heat transfer coefficient on the yield of oil layer has the same rule.In the double well electric heating,with the same heating power,the double well electric heating production of single well is higher than the single well electric heating products.For different spacing(40 m and 50 m and 30 m),the maximum yield oil Wells are 17.15t/d,22.5 t/d and 23.6 t/d,showing that the smaller well spacing,the higher the output is.A set of evaluation method of shale oil yield and economic benefit theory are drown,and the development and utilization of the actual and forecast method is developed for the shale oil development.