排序方式: 共有44条查询结果,搜索用时 812 毫秒
1.
该文建立高效凝胶渗透色谱法 (HPGPC) ,明胶比浊法 ,氧瓶燃烧法三种分析方法考察海洋硫酸多糖药物几丁糖酯的稳定性 ,采用这三种方法分别考察几丁糖酯原料药在高温、高湿、强光照射及加速条件下分子量及分布宽度、样品中硫酸根含量及样品含量的变化情况。结果表明 :三种方法均适用于几丁糖酯的稳定性考察 ,几丁糖酯在上述影响因素条件下稳定性良好 相似文献
2.
Numerical simulation of oil migration and accumulation is to describe the history of oil migration and accumulation in basin
evolution. It is of great value to the evaluation of oil resources and to the determination of the location and amount of
oil deposits. This thesis discusses the characteristics of petroleum geology and permeation fluid mechanics. For the three-dimensional
problems of Dongying hollow of Shengli Petroleum Oil Field, it puts forward a new model and a kind of modified method of upwind
finite difference fractional steps implicit interactive scheme. For the famous hydraulic experiment of secondary migration–accumulation,
the numerical simulation test has been done, and both the computational and experimental results are basically identical.
For the actual problem of Dongying hollow, the numerical simulation test and the actual conditions are basically coincident.
Thus, the well-known problem has been solved. 相似文献
3.
Summary
Hydrofracture Mechanisms in Rock During Pressure Grouting. The paper examines the basic meachnisms controlling the initiation of fractures in rocks and layered soils during pressure grouting, and their subsequent propagation into the ground mass. Previous analyses of fracture initiation have tended to concentrate on simplified models in which the ground is treated as an impervious elastic or Mohr-Coulomb continuum. The present method allows for the porous or fissured nature of the ground by considering the effect of seepage forces induced by the pore pressure gradient. The effect is quantified by use of a parameterN such that the ratio of fluid force used in expanding the injection hole, to that used in forcing fluid through void spaces, isN to (1—N).Analysis of hydrofracture propagation is based on stress analysis of a borehole in an elastic continuum, the propagating fracture zone around the borehole being represented as a non-elastic material governed by the Mohr-Coulomb failure criterion. This is supplemented by an energy approach which equates the energy supplied to the ground from the injection pump, with the energy stored in the ground and the energy necessary to fracture it.
Nomenclature A area of new cracks created per unit volume of time t - E total work done by injection fluid - E i irrecoverable component of energy - E i c work done in fracturing rock or soil - E i l work done to overcome various frictional forces in grouting system - E i p work done to cause plastic deformation of fractured zone - E i s work done to overcome shear strength of fluid during flow - E i v work done to overcome frictional drag between fluid and rock in soil surfaces during flow - E r recoverable component of energy - E r f elastic strain energy stored in fluid - E r s elastic strain energy stored in rock or soil - h height of overburden - i j 1, 2, 3 - K 0 coefficient of horizontal earth pressure - k permeability of ground to grout - L length of cylindrical grout source - n rock or soil porosity - p average fluid pressure between timet and (t + t) - p 0 injection pressure - R radius of grout front - r radial distance from borehole axis - r 0 radius of borehole - r 1 radius of fractured zone - S specific surface area of rock or soil - S T tensile strength of rock or soil - t time - u grout seepage velocity - V volume of grout injected - v volumetric strain - specific surface energy of rock - bulk density of rock or soil - i j e elastic strain increment tensor - i j plastic strain increment tensor - v Poisson's ratio - i j average stress tensor in the ground during timet and (t + t) - R , T, Z radial, tangential and vertical stresses induced by grouting - r , t , z radial, tangential and vertical stress around borehole before grouting - grout shear strength - angle of internal friction of rock or soil With 7 Figures 相似文献
Zusammenfassung Brucherscheinungen im Fels bei Verprearbeiten. In der Arbeit wird der grundlegende Mechanismus untersucht, welcher bei Verpreßarbeiten in Fels und geschichtetem Boden zur Einleitung und Ausbreitung von Brüchen führt. Frühere Untersuchungen des Bruchbeginns stützten sich im wesentlichen auf vereinfachte Modelle, in denen der Untergrund als undurchlässiges Kontinuum angesehen wird, das entweder elastisch ist oder der Mohr-Coulombschen Bruchbedingung genügt. Die neue Methode berücksichtigt dagegen eine Porosität oder Klüftung des Untergrundes durch Ansatz der vom strömenden Medium auf das Gebirge ausgeübten Belastung. Diese Belastung wird aufgeteilt in einen Druckverlust an der Bohrlochwand (gleich ParameterN mal Verpreßdruck) und die entsprechende, über den gesamten durchströmten Bereich verteilte Belastung.Die Untersuchung der Bruchausbreitung geht von der Spannungsermittlung um ein Bohrloch in einem elastischen Kontinuum aus, wobei in der sich ausbreitenden Bruchzone um das Bohrloch herum nichtelastisches Material angenommen wird, das dem Mohr-Coulombschen Bruchkriterium genügt. Zur Ergänzung dient eine Energie-Betrachtung, bei der die von der Injektionspumpe abgegebene Energie gleichgesetzt wird der im Untergrund gespeicherten Energie und der aufgewendeten Brucharbeit.
Résumé Les mécanismes de la fracturation hydraulique dans les roches pendant les injections sous pression. Le mémoire examine les mécanismes fondamentaux qui gouvernent l'initiation des ruptures dans les roches et les sols stratifiés, au cours des injections et leur propagation dans les massifs. Les analyses antérieures de l'initiation de la rupture, se sont concentrées sur des modèles simplifiés où l'on considérait la roche comme un milieu élastique et imperméable, ou comme un milieu de Mohr-Coulomb. La présente méthode admet que le massif est poreux ou fissuré, en considérant l'action des forces de percolation engendrées par le gradient de pression interstitielle. Cette action est quantifiée par un paramètreN, tel que le rapport de la force du liquide employée à dilater le forage d'injection, à celle employée pour forcer le coulis à travers les vides soitN/(1—N). L'analyse de la propagation des ruptures se base sur l'analyse des contraintes autour d'un forage dans un milieu élastique, alors que la zone de la rupture qui se propage autour du forage est représentée par un milieu non-élastique admettant le critère de rupture de Mohr-Coulomb. Cette analyse est complétée par une approche énergétique, où l'énergie qui est fournie au massif par la pompe d'injection est égalée à l'énergie emmagasinée dans la roche et à l'énergie de rupture.
Nomenclature A area of new cracks created per unit volume of time t - E total work done by injection fluid - E i irrecoverable component of energy - E i c work done in fracturing rock or soil - E i l work done to overcome various frictional forces in grouting system - E i p work done to cause plastic deformation of fractured zone - E i s work done to overcome shear strength of fluid during flow - E i v work done to overcome frictional drag between fluid and rock in soil surfaces during flow - E r recoverable component of energy - E r f elastic strain energy stored in fluid - E r s elastic strain energy stored in rock or soil - h height of overburden - i j 1, 2, 3 - K 0 coefficient of horizontal earth pressure - k permeability of ground to grout - L length of cylindrical grout source - n rock or soil porosity - p average fluid pressure between timet and (t + t) - p 0 injection pressure - R radius of grout front - r radial distance from borehole axis - r 0 radius of borehole - r 1 radius of fractured zone - S specific surface area of rock or soil - S T tensile strength of rock or soil - t time - u grout seepage velocity - V volume of grout injected - v volumetric strain - specific surface energy of rock - bulk density of rock or soil - i j e elastic strain increment tensor - i j plastic strain increment tensor - v Poisson's ratio - i j average stress tensor in the ground during timet and (t + t) - R , T, Z radial, tangential and vertical stresses induced by grouting - r , t , z radial, tangential and vertical stress around borehole before grouting - grout shear strength - angle of internal friction of rock or soil With 7 Figures 相似文献
4.
侯东城 《成都信息工程学院学报》2001,16(3):203-208
网络生产力是一个复杂的系统,它包括构成要素层次,渗透性因素层次与组合性因素层次而有别于一般生产力的新质。 相似文献
5.
深层渗滤效应普遍存在于多孔介质的渗透注浆过程中,并起着非常重要的作用。基于质量守恒方程、线性滤过定律、渗流连续性方程及Darcy定律,建立了水泥浆三维锋面的理论模型;通过现场试验,研究了水泥浆三维锋面扩散运移及沉积层渗透系数的变化规律,并将试验值与模型理论值进行了对比分析。结果表明,沉积层渗透系数随水泥浆锋面的扩散运移动态变化;当注浆压力恒定时,水灰比越小,深层渗滤效应越显著,浆液扩散距离相应越短;相同扩散距离时,受重力效应的影响,注浆点源之上的沉积层渗透系数大于注浆点源之下的沉积层渗透系数;浆液扩散距离及固定位置处的沉积层渗透系数均与水灰比呈正相关。研究成果可指导工程设计,具有一定的实际应用价值。 相似文献
6.
7.
杨振华 《中国海洋大学学报(自然科学版)》1997,(4)
采用声学方法精密测定汞被高压强压入储油岩样的渗入体积,对岩芯孔隙结构测定中的汞体积计量方法作了重要改进。本方法以无水酒精作为计量工作介质,在其中发射声波,通过对汞界面反射声波的识别,进行非接触的声学测量,从根本上解决了当前国内外采用的电阻法,电容法无法避免的由于汞腐蚀或油污染而要求经常进行与有毒汞接触的清洗,并且确保了计量系统工作性能的长期稳定与准确可靠。在0.01MPa至50MPa压强范围内连续计量,量程0~10ml,准确度0.01ml。 相似文献
8.
凝胶渗透色谱法测定壳聚糖分子量 ,以葡聚糖为标准品 ,用 2种不同的凝胶柱 (PLaquagel- OH柱和 TSK G4 0 0 0 PWXL柱 )测定 4种样品的分子量及其分布 ,并经过普适标定。比较结果发现 :PL aquagel- OH柱效果稍好于 TSK G4 0 0 0 PWXL柱。两柱所得重均分子量平均偏差为 0 .17%~ 3.38% ,数均分子量的平均偏差为 0 .90 %~ 3.5 7% ,分子量分布宽度指数 1.34~ 1.5 4。 相似文献
9.
10.
遥感技术在鄂尔多斯盆地东南部煤层气勘探中的应用 总被引:1,自引:0,他引:1
从鄂尔多斯盆地黄土塬区煤层气勘探的实际需要出发,通过遥感解译,利用裂缝密度统计分析方法,对研究区煤层气高渗区带进行了预测,并对区内煤层气勘探的有利区带进行了初步评价,为煤层气勘探提供了重要的参考资料. 相似文献