EXACT SOLUTION TO THE PROBLEM OF FLOW OF SLIGHTLY COMPRESSIBLE FLUIDS IN A BOUNDED CONFINED “PRACTURE-PORE” MEDIUM AND ITS APPLICATION TO WELL TESTING

The problem of flow of slightly compressible fluids through a bounded confined fracture-pore medium is solved and studied thoroughly in this paper. Some essential natures of flow of elastic liquids through a medium with double porosity under the condition of neglecting the flow in matrix system were revealed and clarified further. The method of estimating all parameters commonly interested in a bounded confined fracture-pore medium reservoir through a series of flow tests in wells by use of the solution obtained is presented.     

辉光放电质谱法测定高纯钛中痕量杂质元素及其相对灵敏度因子校正EI北大核心CSCD

通过选择合适的同位素及分辨率,建立了辉光放电质谱法(GDMS)测定高纯Ti中57种痕量杂质元素的方法。辉光放电过程优化条件为Ar流量500 mL/min,放电电流2.2 mA,预溅射时间30 min。利用高纯Ti标准样品获得了与基体匹配的13种元素的相对灵敏度因子(RSF)值。用建立的方法对高纯Ti溅射靶材样品进行检测,主要杂质元素为Al, Si, S, Cl, V, Cr, Mn, Fe, Ni, Cu, Zr,含量在0.051~2.470μg/g之间,相对标准偏差(RSD)<23%,杂质总量<5μg/g。其中,Ca, Nb元素的检出限为0.5μg/g,其余元素的检出限低至10 ng/g级或1 ng/g级,而且Th, U元素的检出限达到0.1 ng/g。该方法能够满足5N级高纯金属Ti溅射靶材的检测要求。