气中水含量对气藏流体相态与渗流的影响

考虑地层水的蒸发对烃类气藏生产的影响的研究较少，研究认为，从地层到地面过程中，气中水蒸汽含量的变化规律有3个阶段：近井区域的气-水两相平衡阶段；井底附近的未饱和阶段；井筒中某一点到地面的非平衡的“过饱和阶段”，也就是凝析水的产生。同时考虑到由于井底附近压力的降低，地层水的再蒸发，还可能对井底附近的储层造成盐堵，从而降低其渗透率对生产造成影响。当烃类气的组分含量变大时，平衡时其饱和水蒸汽含量相对较大；考虑实际地层中水蒸汽存在时，无论从实验室还是相平衡计算的结果来看，都使凝析气的露点压力有所降低。     

Analysis of a Feedback Fluid Model for Heterogeneous TCP Sources

In this paper we consider a bottleneck link and buffer used by one or two fluid sources that are subject to feedback. The feedback is such that the model captures essential aspects of the behavior of the Transmission Control Protocol as used in the Internet. During overflow, the buffer sends negative feedback signals to the sources to indicate that the sending rate should be reduced. Otherwise the buffer sends positive signals so as to increase the rate. In this context we find closed form expressions for the solution of the one-source case. The two-source case extends the single-source model considerably: we can control the behavior and parameters of each source individually. This enables us to study the impact of these parameters on the sharing of links and buffers. For the two-source case we solve the related two-point boundary value problem in the stationary case. We also establish a numerically efficient procedure to compute the coefficients of the solution of the differential equations. The numerical results of this model are presented in an accompanying paper.     

L型集箱系统并联管组的水动力推进算法

以不可压流体的连续方程和动量方程为基础，将分支管流速作为未知量，建立推进算法的基本方程和计算方法．在推进计算的每一步中，只需要求解关于分支管流速的代数方程，计算过程简单，易于收敛．计算结果表明，这种算法适用于L型集箱系统的并联管组水动力计算．     

流体力学课程分层次教学模式研究

探讨了流体力学分层次教学模式改革中学生主体层次、教学大纲的层次化、课堂训练和作业布置的层次化、实验课教学的层次化以及考核方法和手段的改革,并分析了保障层次化教学改革的其他关键措施。     

超临界流体萃取技术应用研究

近年来,随着科学技术的发展,超临界流体萃取技术在国内外分离领域取得了巨大进步。本文就超临界流体萃取技的发展概况,原理,应用,以及未来发展做了简单的介绍。     

海上稠油热采井井筒温度场模型研究及应用

摘要：海上稠油油田的开发越来越受到人们的重视,多元热流体吞吐是一项集热采、烟道气驱等采油机理于一体的新型、高效稠油开采技术,该技术在渤海油田进行了现场试验并取得了成功。以渤海 M 油田多元热流体吞吐实验井为例,介绍了海上稠油油田多元热流体吞吐工艺的特点;研究了热流体吞吐井各传热环节及井筒温度场分布模型,建立了井筒综合传热系数的计算方法,并以海上实际热流体吞吐井为例进行了计算。在此基础上,模拟了隔热油管导热系数、下入深度、多元热流体组成等工艺参数对热采效果的影响,并得到了一些有益的结论,为海上稠油油田规模化热力采油工艺方案优化设计起到指导性作用。     

特低渗透油藏入井流体顺序接触储层损害评价

特低渗透油气资源在剩余油气资源中的地位越来越凸显。由于低孔低渗的特点,特低渗透油层在钻井、完井、采油、增产改造、EOR 等全过程均会发生储层损害。以镇泾油田长8 组为研究对象,对钻井完井液、压井液和压裂液顺序接触储层对储层的损害进行了方法探讨和实验评价。结果表明,钻井完井液对储层的损害最严重,压裂液次之,压井液最轻。分析表明,流体敏感性损害和漏失损害是钻完井液损害储层的主要因素。压裂液乳化、残渣、液相圈闭、浸泡时间损害,天然裂缝与水力裂缝堵塞,压裂液的冷却效应是压裂液损害的主要因素。最终提出了加入封堵剂改善钻完井液性能,从压裂工艺、压裂液体系出发改善压裂液的解决方式,实现全过程储层保护是特低渗油藏开发的关键。     

混凝法处理钻井废水的残渣浸出特性研究

用混凝法处理钻井废水可使水中污染物集中于残渣之中。本文总结了两种残渣在不同pH值和不同温度下的浸出实验,并指出由于混凝水解聚合体的影响,残渣的浸出液中只有少量的污染物存在,进而提出了减少残渣污染的建议。     

Strong approximations for time-varying infinite-server queues with non-renewal arrival and service processes

In real stochastic systems, the arrival and service processes may not be renewal processes. For example, in many telecommunication systems such as internet traffic where data traffic is bursty, the sequence of inter-arrival times and service times are often correlated and dependent. One way to model this non-renewal behavior is to use Markovian Arrival Processes (MAPs) and Markovian Service Processes (MSPs). MAPs and MSPs allow for inter-arrival and service times to be dependent, while providing the analytical tractability of simple Markov processes. To this end, we prove fluid and diffusion limits for MAP_t/MSP_t/∞ queues by constructing a new Poisson process representation for the queueing dynamics and leveraging strong approximations for Poisson processes. As a result, the fluid and diffusion limit theorems illuminate how the dependence structure of the arrival or service processes can affect the sample path behavior of the queueing process. Finally, our Poisson representation for MAPs and MSPs is useful for simulation purposes and may be of independent interest.     

集装箱码头外部集卡预约优化模型与算法

针对集装箱码头闸口拥堵问题,建立集卡预约优化模型,目的是减少集卡排队等待时间和拥堵期间的碳排放。该模型在给定的集卡到达调整量水平的限制下,确定每个时段最优的预约份额,同时利用非平稳排队模型描述集卡到达随时间到达的特点。为求解模型,设计基于遗传算法与逐点固定流体近似算法(PSFFA)的求解方法,该算法利用遗传算法搜索最优解,基于PSFFA算法计算集卡排队时间。最后,利用算例对模型和算法的有效性进行了验证。结果表明,集卡预约优化模型可以有效地减少集卡排队时间,PSFFA方法可以较好地求解到达过程不平稳的排队问题。