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第十届全国渗流力学学术会议暨2009渗流力学及应用国际论坛

作者： Nakayama Akira Institute of Poromechanics Wuhan Polytechnic University Department of Mechanical Engineering Shizuoka University

In order to investigate the seepage characteristic for fracture network filled with porous medium,using hydrodynamic theory,based on the N-S equation,the numerical experiments of fractured porous media filled with porous medium were *** relationship of filled fracture network permeability,porosity and particles diameters was deduced by the numerical *** results shown that when(?)>0.6,the analytical expression agrees well with experimental data,then modified the expression when(?)≤0.6,finally represented a new *** helps us to research the seepage characteristic of filled fracture network.

关键词： filled fracture network N-S equation seepage characteristic numerical experiment

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seepage characteristics of a fractured silty mudstone under different confining pressures and temperatures

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Journal of Central South University 2020年第7期27卷 1907-1916页

作者： FU Hong-yuan JIANG Huang-bin QIU Xiang JI Yun-peng CHEN Wen ZENG Ling School of Traffic&Transportation Engineering Changsha University of Science&TechnologyChangsha 410114China School of Civil Engineering Changsha University of Science&TechnologyChangsha 410114China Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux Universitéde LorraineMetz 57070France

To investigate the influence of confining pressures and temperatures on the seepage characteristics of fractured rocks, seepage tests were conducted on a fractured silty mudstone using a self-developed experimental system, and the effects of different factors on coefficient of permeability were discussed. The results showed that the increasing confining pressure will gradually decrease the coefficient of permeability, and this process is divided into two stages: 1) the fast decrease stage, which corresponds to a confining pressure less than 30 kPa, and 2) the slow decrease stage, which corresponds to a confining pressure larger than 30 kPa. Unlike confining pressure, an increase in temperature will increase the coefficient of permeability. It is noted that fracture surface roughness will also affect the variation of coefficient of permeability to a certain extent. Among the three examined factors, the effect of confining pressure increases is dominant on fracture permeability coefficient. The relationship between the confining pressure and coefficient of permeability can be quantified by an exponential function.

关键词： silty mudstone seepage characteristic confining pressure temperature permeability

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Experimental Study on seepage characteristics of a Soil-Rock Mixture in a Fault Zone

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Fluid Dynamics & Materials Processing 2022年第2期18卷 271-283页

作者： Pengfei Wang Xiangyang Zhang Key Laboratory of Safety and High-Efficiency Coal Mining Ministry of EducationAnhui University of Science and TechnologyHuainan232001China School of Architecture and Civil Engineering Huangshan UniversityHuangshan245041China

A mixture of fault gouge and rubble taken out from a fault zone is used to prepare a S-RM(Soil-Rock Mixture)sample with rock block proportions of 20%,30%,40%,50%,60%and 70%,respectively.A GDS triaxial test system is used accordingly to measure the seepage characteristics of such samples under different loading and unloading confining pressures in order to determine the variation law of the permeability *** test results show that:(1)The permeability coefficient of the S-RM samples decreases as the pressure increases,and the decrease rate of this coefficient in the initial stage of confining pressure loading is obviously higher than in the semi-late period;(2)The permeability coefficient at different confining pressure levels presents a common trend as the rock block proportion is increased,i.e.,it decreases first then it increases(the permeability coefficient of the sample with rock block proportion 40%being the smallest,70%the largest);(3)In the stage of confining pressure unloading,the recovery degree of the permeability coefficient grows with the increase of rock block proportion(the recovery rate of S-RM sample with rock block proportion 70%reaches 50.2%);(4)In the stage of confining pressure loading and unloading,the sensitivity of the permeability coefficient to the rock block proportion displays the inverse“Z”variation rule(when rock block proportion reaches 60%,the sensitivity is highest);(5)In the stage of confining pressure loading,the relationship between the permeability coefficient and confining pressure can be described by an exponential relationship.

关键词： Fault zone rock block proportion soil-rock mixture confining pressure loading and unloading seepage characteristic

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The influence of water disposal method on the property of chemical oil-displacement agent–taking Guan 109-1 area of Dagang oilfield as example

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Petroleum 2018年第1期4卷 50-55页

作者： Shengwang Yuan The Second Oil Production Plant of Daqing Oilfield Daqing163318China

Aiming at the actual demand of Guan 109-1 block in Dagang oilfield,by means of instrumental analysis,chemical analysis,modern physical simulation,viewing polymer viscosity and seepage characteristic as evaluation index,the experimental research on the influence of water disposal method on the property of chemical oil-displacement agent was carried *** showed that through adding scaling agent,scale was formed because of the reaction between scaling agent and Ca^2+,Mg^2+ in the flooding water,which could enhance the viscosity of polymer *** comparing the resistance factor and residual resistance factor of polymer solution which was respectively prepared with flooding water,softened water and scale,the resistance factor and residual resistance factor of polymer solution with scale was the largest,that of polymer solution prepared with softened water was second and that of polymer solution prepared with flooding water came ***,scaling agent weakened the gelling effect between cross-linking agent Cr^3+ and polymer molecule *** earlier the crosslinking agent Cr^3+ was added,the larger the polymer viscosity,resistance factor and residual resistance factor of Cr3t polymer were.

关键词： seepage characteristic Water disposal Scaling agent Resistance factor and residual resistance factor

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