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| 1 | 核磁共振技术对热解煤孔隙结构分形特征研究显示文摘为研究煤经过热处理后孔隙结构的变化,通过低场核磁共振(NMR)技术,获得不同温度处理的煤岩横向弛豫时间,根据不同横向弛豫时间的信号强度分析了不同孔径的孔隙含量,进而得出孔隙特征随温度的变化规律。利用体视镜获得表面的微观照片,以Matlab数字图像处理法辅助观察煤岩表面变化过程与加热后的现象。对核磁数据进行了分形分析,获得各孔径区间的分形维数D_(x)与整体分形维数D_(NMR)。结果表明:微孔对D_(NMR)的影响最大,呈正比关系,而与温度、总孔隙度相关性不大。 | 胡鑫 王超勇 孙强 董再田 | 2021 | 矿业研究与开发2021，41，11： | 3 |
| 2 | Estimation of pore volumes to breakthrough number in limestone cores by derivation of an empirical model显示文摘Acidizing in carbonate formations is an inevitable stimulation treatment method for oil and gas wells.In the limestone,acidizing stimulation makes capillary wormholes to increase fluids flow reservoir production.The pore volume to breakthrough number is one of the main indexes for recognizing the wormhole structure.Therefore,finding the pore volume to breakthrough number is one of the main goals in the limestone acidizing.Obtaining this number is always required for experimental works,which needs time,energy and cost.The purpose of this research is to develop an empirical method to estimate an acceptable result for this number merely by implementing limestone core and acid properties without any experimental work.In order to create a wormhole,an empirical method is developed using the law of conservation of mass considering that the core of limestone as an isolated package and the overall mass is constant in this package in the acidizing period.Also,to develop the mathematical section,the Damk€ohler number is used.Since this number must be calculated experimentally,a constant number is created in the model to eliminate the Damkohler number.An average accuracy of 92.31%is obtained for the developed empirical model by comparing the results obtained from the other three experimental and numerical works.This study conclusively provides a thoroughly empirical method for estimating a high accuracy of the pore volume to breakthrough number by only using known physical properties limestone core and acid. | Sina Lohrasb Radzuan Junin | 2021 | Petroleum Research2021，6，3： | 0 |
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