共查询到10条相似文献,搜索用时 218 毫秒
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基于分形理论和连续性假设,考虑页岩气吸附解吸、基质-裂缝窜流等机制,建立分形裂缝性页岩气藏多段压裂水平井试井解释模型,并通过拉氏变换、点源函数及压降叠加原理等方法得到模型的解.绘制无因次压力随时间变化的双对数曲线,研究分形裂缝性页岩气藏多段压裂水平井的压力特征,分析分形指数、分形维数等参数对压力动态的影响.结果表明:分形裂缝性页岩气藏多段压裂水平井的压力动态可划分为7个流动阶段;分形指数越大或分形维数越小,晚期径向流直线段的斜率越大;其它参数对水平井的压力动态也有一定的影响. 相似文献
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低渗透油藏压裂水平井井筒与油藏耦合的非稳态模型 总被引:5,自引:1,他引:4
推导低渗透各向异性油藏压裂水平井井筒与盒式油藏耦合的非稳态模型,并给出求解方法.模型考虑摩阻和加速度的影响,并可以使用不同类型的约束条件.实例计算表明,压裂水平井的流动可分为非稳态阶段和拟稳态阶段.在非稳态阶段,各条裂缝的产量相差不大,总产量随着裂缝条数的增加呈线性增加;在拟稳态阶段,两端裂缝产量高于中部裂缝的产量.受摩阻和加速度压降的影响,空间上位置对称的裂缝在流量上呈现不对称性.井筒内压力损失的存在将使水平井的产量降低,并使井筒内的压力分布不均匀.在最小井底流压的基础上固定流量时,裂缝条数越多,稳产期也越长. 相似文献
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基于保角变换和镜像反映原理,建立五点法水平井与直井混合注采井网流场数学模型,导出其势函数和流函数数学表达式,得到五点法混合注采井网内部等势线和流线分布.研究水平井长度、水平井与直井连线夹角、平面各向异性及水平井不同平面位置等因素对混合注采井网内部流场分布的影响.结果表明:混合注采井网水平井跟端和趾端,流线分布相对密集,两端位置产液能力较强;水平段越长,其流线控制的泄油面积越大;水平井与直井连线成45°角时,水平井与正对的两口直井间的驱替强度相对较大;水平井垂直于主渗透率方向时,流线均匀密集地汇聚到生产井,易形成线性驱替;混合注采井网内部水平井偏离中心位置程度越大,流线分布疏密分化越明显. 相似文献
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A static physical model of the larynx (model M5) was used to obtain a large set of volume flows as a function of symmetric glottal geometry and transglottal pressure. The measurements cover ranges of these variables relevant to human phonation. A generalized equation was created to accurately estimate the glottal volume flow given specific glottal geometries and transglottal pressures. Both the data and the generalized formula give insights into the flow behavior for different glottal geometries, especially the contrast between convergent and divergent glottal angles at different glottal diameters. The generalized equation produced a fit to the entire M5 dataset (267 points) with an average accuracy of 3.4%. The accuracy was about seven times better than that of the Ishizaka-Flanagan approach to glottal flow and about four times better than that of a pressure coefficient approach. Thus, for synthesis purposes, the generalized equation presented here should provide more realistic glottal flows (based on steady flow conditions) as suitable inputs to the vocal tract, for given values of transglottal pressure and glottal geometry. Applications of the generalized formula to pulses generated by vocal fold motions typical of those produced by the Ishizaka-Flanagan coupled-oscillator model and the more recent body-cover model of Story and Titze are also included. 相似文献
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流动注射在线液-液萃取-ICP-AES测定土壤和化探样品中痕量铌和钽 总被引:5,自引:0,他引:5
应用流动注射在线萃取技术将Nb,Ta萃入甲基异丁酮(MIBK)和磷酸三丁脂(TBP)混合溶剂直接进行ICP-AES测定.研究了流动注射在线萃取-电感耦合等离子体原子发射光谱法测定土壤和化探样品中Nb和Ta的实验条件、流路参数、酸度条件的选择,考察了共存元素的干扰.采样速率为20样@h-1,RSD(n=10)为Nb4.5%;Ta5.1%,测定检出限(K=3)为Nb0.5ng@mL-1;Ta0.8ng@mL-1.方法操作简便、快速,经对国家一级标准物质分析,结果与推荐值一致. 相似文献