| The oil shale is the importance of the international generally accepted traditional petroleum resources to act for one of the resources. This text passes the experiment research and the theories analysis, hot solution characteristic and seepage that announced to public the oil shale flow the regulation. Make use of the related knowledge establishment of the rock fluid mechanics the mathematics model that the method oil shale in-situ mine, and combine to mathematics model to carry on the number to imitate.This text main research contents and results are as follows:1. Pass carry on to the oil shale in great quantities of the pyrolysis experiment, can know the oil shale in of vaporize from the 350°C beginning produce, main the pyrolysis of oil spirit produce the temperature scope as 400-600°C.2. Based on the retort and seepage experiment of oil shale by using high temperature and high pressure vapor, following conclusion can be researched:1) high temperature and high pressure vapor is efficiency in retorting oil shale and bringing out the yield shale oil;2) A great numbers of fractures are formed under the influence of high temperature and high pressure vapor, so the permeability is increased remarkably;3) The permeability coefficient has a exponent relationship with the volume stress and pore pressure:K = 0.7881EXP(-0.19040+ 0.2283p-0.0010Θp)3. This text passes to chase the oil shale simplification is random and not all the quality model, carry on the detailed theories analysis and push to play, and building up the mathematics model that the method oil shale in-situ mine. And solve the condition certainly appropriately, constitute the mathematics model that the oil shale body in-situ mine. Studied the number solution method of the above-mentioned mathematics model also, deduce the calculation method of each related parameter, apply the language of Fortran to draw up a number analysis procedure of the 3D mathematics model of the oil shale.4,Utilize the classical heat-conduction mathematical model and adopt the 3D FEM, the numerical simulation of heat exploit of oil shale under in-situ process are carried out in this paper, it indicate the variation law of temperature change with time. Main get a following result:1) Many wells that be apart from to 13 meters between the well give or get an electric shock to heat the oil shale retorting mine process, heat the well temperature is 750°C. Along with the growth of time, the temperature that mines the district goes up continuously, the trend that the growth rate of the temperature presents to lower year by year. In start of 4 years, the temperature growth is quick very, after, along with time of extension, the temperature growth slow-moving, at mine about 9 years to transmit heat the gradual change of way to transmit heat for the steady appearance , the temperature of the district center also can attain 370°C only or so. Synthesize to consider various factor, this heating well can't continue to heat, so this calculation model mines the period to be far larger than 9 years.2) Exchange the heating well and the oil extraction well that the much more above-mentioned well electricity heat the oil shale retorting mine, continue to heat to mine. 5 after years, the temperature that is apart from to heat the or so place of 6 meters of well is also only is 500°C, but heat whole temperatures of the nearby rock strata of wells all very high, cause the calories follow the peripheral rock strata in great quantities lost. Past think that the electricity heating method exists the very big blemish, adopt this kind of electricity heating method to heat to the oil shale especially it can consume to compare greatly and transmit heat slow-moving, but for raising the whole temperature of oil extraction district, essential the exaltation notes the temperature of the hot well, thus causing note the hot well neighborhood to usually produced the hot phenomenon, the temperature is hard to regulate, causing damage internal equipments of the well eye.3) The convection heats that is apart from to 13 meters between the well heats the oil shale retorting mine process, heat the temperature as 600°C. Adopting single crack heating to need 4 years can make the whole hot solution district attain 500°C above, the adoption double crack heating need a year and can make whole hot solution the district attain 600°Cs or so. So the calories for convection to heat the method heating oil shale lose small, although the hot source temperature is lower than the heating well temperature for electricity to heat method 150°C, but can make the whole rock strata attain the hot solution temperature in very short time but complete hot solution.In fine, really pass to heat the method home position to mine the technical number of the oil shale to imitate to the electricity, discover that that technical function is worse, the cost is high, is not suitable for the expansion usage. But the convection heat and can complete the hot solution of the oil shale in shorter time, the convection heats a kind of method that the method will be more for the reasonable in-situ of the oil shale of the aftertime mine.
|
PDF Full Text Request