Study On The Coupling Model And Numerical Simulation Of Glauberite Deposit's Solution-Pervasion In-situ

This paper reveals the characteristic and regulation of glauberite by study of the experiment and analysis of theory, establishes a coupling model of glauberite dissolved in-situ by making use of the related knowledge of the rock fluid mechanics ,and then this coupling model is numerical simulated .The main research contents and results of this paper are as follows:(1)Through the micro- experimental research on the dissolve characters and regulations of glauberite, the experiment illustrates that the process of dissolution includes the process of crystal's dissolution and rime, this two processes take place at the same time; Dissolution happens in cracks at first and then expands around; The process of dissolution is a mutual interaction process of dissolution and pervasion;The flow of water in glauberite deposit can be looked as a flow in pore-medium and a process of convection-pervasion; (2)To establish the coupling model of glauberite deposit's solution-pervasion in-situ. The result of the research illustrates that: the process of dissolution is a process of interactions of dissolution and pervasion. If the glauberite deposit is dissolved in-situ, the characters of mechanics will affect it. So the author establishes a coupling model of glauberite deposit's solution-pervasion in-situ by making use of rock mechanics, fluid mechanics and physical chemistry, etc.(3) To numerical simulate the coupling model of glauberite deposit's solution-pervasion in-situ. The result of computations illustrates that: (1) Between the well of injection and the well of producing, the water pressure at the well of injection is the most high, the water pressure at the well of producing is the most low; the distance from the well of injection is farther, the water pressure is smaller; the decreasing rapidity of the water pressure is slower with distance from the well of injection when the time of glauberite dissolved in-situ is 240 and 288 hours, the decreasing rapidity of the water pressure is line with distance from the well of injection when the time of glauberite dissolved in-situ is 960 and 1200 hours; the water pressure in vertical direction varies specially small, and can look it as a constant.(2) Between the well of injection and the well of producing, the rapidity of seepage at the well of injection is the most high, the rapidity of seepage at the well of producing is the most low; the distance from the well of injection is farther, the rapidity of seepage is smaller; the decreasing rapidity of the rapidity of seepage is slower with distance from the well of injection when the time of glauberite dissolved in-situ is 240 and 288 hours, the rapidity of seepage varies specially small when the time of glauberite dissolved in-situ is 960 and 1200 hours; the rapidity of seepage in vertical direction varies specially small, and can look it as a constant.(3) Between the well of injection and the well of producing, the concentration of solution at the well of injection is the most low, the distance from the well of injection is farther, the concentration of solution is larger, and the largest value is lies around the well of producing. (4) Between the well of injection and the well of producing, the height of dissolving upward at the well of injection is the biggest, the height of dissolving upward around the well of producing is the lowest; the distance from the well of injection is farther, the height of dissolving upward is smaller. (5)The influence on the displacement of rock mass around the zone dissolved is more than the farther from the zone dissolved.