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Microscale mechanism of tailing thickening in metal mines

International Journal of Minerals,Metallurgy and Materials 2023年第8期30卷 1538-1547页

作者： Huazhe Jiao Wenbo Yang Zhu’en Ruan Jianxin Yu Juanhong Liu Yixuan Yang School of Civil Engineering Henan Polytechnic UniversityJiaozuo 454000China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China

Water-locking flocs formed by ultrafine tailings particles will damage the thickener underflow concentration in the thickening process during paste preparation.The relationship between the mesostructure and seepage characteristics of tail mortar is typically ignored when investigating the deep dehydration stage.A shearing seepage test of an unclassified tailing-sedimentation bed was performed with copper tailings,and the morphology and geometric distribution of micropores were analyzed via X-ray computed tomography.Moreover,the shearing evolution of the micropore structure and seepage channel was investigated to evaluate the dewatering performance of underflow slurry using a three-dimensional reconstruction approach.The results show that porosity decreases considerably under shearing.The connected-pore ratio and the average radius of the throat channel reach peak values of 0.79 and 31.38μm,respectively,when shearing is applied for 10 min.However,the reverse seepage velocity and absolute permeability in the bed decrease to various extents after shearing.Meanwhile,the maximum flow rate reaches 1.537μm/s and the absolute permeability increases by 14.16%.Shearing alters the formation process and the pore structure of the seepage channel.Isolated pores connect to the surrounding flocs to form branch channels,which then become the main seepage channel and create the dominant water-seepage flow channel.

关键词： paste thickening computed X-ray tomography shear action pore structure seepage channel

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Numerical Simulation Study on the Effect of Horizontal Well Reservoir Stimulation for Gas Hydrate Production

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Acta Geologica Sinica(English Edition) 2022年第2期96卷 701-712页

作者： LI Xiaoyang TIAN Yingying ZHANG Xin SONG Gang ZHAO Ming LIANG Jinqiang HUANG Wei MENG Fanle Institute of Exploration Techniques China Geological SurveyLangfangHebei 065000China Directional Drilling Technology Innovation Center China Geological SurveyLangfangHebei 065000China Guangzhou Marine Geological Survey China Geological SurveyGuangzhou 511466China Research Institute of Petroleum Exploration and Development Beijing 100083China

A new gas hydrate reservoir stimulation method of in-situ fracturing with transient heating is proposed, in line with analysis of the technological bottlenecks faced by marine gas hydrate production. This method injects the developed chemical reagents into a hydrate reservoir through hydraulic fracturing, releasing heat during the chemical reaction to increase the hydrate decomposition rate. The chemical reaction product furthermore has a honeycomb structure to support fractures and increase reservoir permeability. Based on the geological model of natural gas hydrate in the South China Sea, three development methods are simulated to evaluate hydrate production capacity, consisting of horizontal well, fractured horizontal well and in-situ fracturing with transient heating well. Compared with the horizontal well, the simulation results show that the cumulative gas production of the fractured horizontal well in one year is 7 times that of the horizontal well, while the cumulative gas production of in-situ fracturing with transient heating well is 12 times that of the horizontal well, which significantly improves daily efficiency and cumulative gas production. In addition, the variation patterns of hydrate saturation and temperature-pressure fields with production time for the three exploitation plans are presented, it being found that three sensitive parameters of fracture conductivity, fracture half-length and fracture number are positively correlated with hydrate production enhancement. Through the simulations, basic data and theoretical support for the optimization of gas hydrate reservoir stimulation scheme has been provided.

关键词： natural gas hydrate horizontal well reservoir stimulation transient heating seepage channel hydraulic fracturing production enhancement technology

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