The Establishment Of Refrigeration Equipment Of Core And The Study Of Its Mathematics Model Of Gas Hydrate Drilling

In the face of the absence of energy sources, we must discoverand use the new energy sources for slacking the urgency .Gas hydrateis a kind of new energy with predominance of abundance andlustration .Expert said it can be the main energy in 21 century takeplace of oil and natural gas.Gas Hydrate has another name called Clathrate ,it formed by waterand natural gas at the condition of proper temperature ,stress ,PH ,andso on .It can burn and be express by the formula that M.nH2O ,M denotemolecule of gas ,n is the number of molecule of water. Gas moleculeof Gas Hydrate is compose of CH4,C2H6,C3H8,C4H10,CO2,N2,H2S and so on ,andit's main gas molecule is methane ,we called the Gas Hydrate thatcontain methane by 99% Methane Hydrate.Gas Hydrate is distribute very broadly in the natural such asslope of land and island, hunch of fringe of land, polar region anddeep water of lake inland. At the normal state one bulk Gas Hydratecan be decomposed to 164 bulks, so we can say that it is a very importantlatent energy in the futureA lot of expert had study the reason how it forms and how to digit out. Through 30 years hard work, we have earned a lot of plentifuland substantial harvest in a lot of facet such as the structure andcharacter of Gas Hydrate, geology, physical geography prove and soon.Drilling is the directly and necessary way, we must dig it outby drilling at last.The equipment for drilling Gas Hydrate has been invent in othercountries ,but they didn't work very well in the practice .Our countryhas not invent this kind of equipment. St .Petersburg mining institutein Russia and building institute of Jilin University work togetherto invent this kind of equipment at this background of the world .Ourbase idea is :freeze the rock and make its temperature low ,from therelation of temperature and stress we can know that if we make thetemperature low then the stress for containing conformation will belower too .Use this method we can restrain the decompose of the GasHydrate .In the same time the water in the rock can be freeze to ice ,itcan besiege the Gas hydrate and protect the Gas hydrate from decomposetoo.In the guidance of this idea we build the experiment equipment,it contains condenser, compressor, sensor and equipment for keeptemperature and so on .The sample was freezed in this experimentalequipment, we can take the temperature in the coach of experiment,and these data will be used in the future when we need to know whetherour mathematics model is right or wrong.We establish a mathematics model from this equipment ,becausemathematical method is finite ,and it can not deal with the complexcondition ,so we should disperse the mathematics model and then wecan analyse the process of freezing by numerical method ,find out howthe temperature change and how long time we can freeze the rock baseon the mathematics model .We take the data of sample in differentdistant in the same time ,we also can take data of some point indifferent time .These data will be used when we need them .then wecan do a lot of experimentation and collect the data ,from the datawe can know whether the mathematical model is right or wrong .and thenwe change the mathematics model until it is right .From the rightmathematics model we can work out how many energy will be need andhow long time we should freeze ,these data will help us for designingthe drilling equipment...