空心杆中管掺热液体闭式循环井筒流体温度计算模型

针对稠油井井筒流体流动条件和举升效果差的问题,研究了抽油机井空心杆中管掺热液体闭式循环举升工艺,建立了抽油机井空心杆中管掺热液体闭武正循环和闭式反循环的井筒流体温度计算模型,并分析了掺入热液体的温度和质量流率对井筒中地层产出流体的温度分布和抽油机井的悬点载荷的影响.结果表明,提高掺入热液体的温度和质量流率,井筒中地层产出流体的温度升高;正循环和反循环方式分别有利干提高热交换井段下部和上部的地层产出流体的温度;反循环方式时地层产出流体在井口温度较高,更有利于地面集输;抽油机井的最大悬点载荷减小,最小悬点载荷增加,载荷差降低,举升效果得到改善,且正循环方式的举升效果优于反循环方式.     

油田聚合物产出液黏度的影响因素

三次采油含聚污水中残留HPAM的含量体现在采出液的黏度上,直接影响到含聚污水的处理.实验以乌氏黏度计法测量聚合物溶液的黏度下降率,通过对pH值、水质阴阳离子量、黏均分子量和剪切速率等相关因素的研究发现,渤海JZ9 -3油田注聚用FP3640C型聚合物的溶液黏度在pH值2～4范围内影响明显,pH＞7以后,黏度损失率减小;...     

胜坨油田污水水质对聚丙烯酰胺凝胶堵剂成胶影响研究

水质对聚丙烯酰胺凝胶堵剂的成胶有较大的影响,该文通过分析不同水质中的pH值,矿化度中钙离子、镁离子、钠离子,以及机械杂质、含油量、不同离子浓度等各种因素,对聚丙烯酰胺凝胶堵剂的成胶强度和时间影响进行试验,得到了聚丙烯酰胺的最佳成胶条件和成胶时间,即pH值范围5～7,钙离子浓度范围2 000～3 000 mg/L,镁离子浓度范围2 500～4 000 mg/L,钠离子浓度范围为10 000～30 000 mg/L,污水中机械杂质对成胶也有很大影响,但含油量对成胶影响较弱。通过一系列的研究实验,用不同区块水质配制的堵剂,达到了现场堵水调剖施工工艺的要求。     

发动机油的表观粘度

发动机油的表观粘度反映了发动机油的使用特性.简要介绍了发动机油表观粘度的意义和测定方法.     

影响测定润滑油运动粘度的因素

运动粘度是润滑油最重要的质量指标,也是选用润滑油的一项重要依据.分析了粘度计,温度控制,试样清洁度和试样量等因素对测定运动粘度的影响,只有严格控制测定条件才能保证测定的准确性.     

A criterion for flow mechanisms through vertical sharp-edged orifice and model for the orifice discharge coefficient

According to the experimental data of the orifice discharge coefficient for the flow through a vertical sharp-edged orifice obtained in the previous study of this work,a theoretical criterion for flow mechanisms of small orifice(viz.thick-walled orifice and nozzle) and large orifice(viz.thin-walled orifice) was proposed based on the ratio of orifice diameter to plate thickness.It can help explain the dissipation of the mechanical energy loss in the flow process for the two flow mechanisms under different operating regimes.The main parameters such as orifice diameter,plate thickness and liquid head were correlated,and a semi-empirical model for orifice coefficient and an empirical model with high precision at the stable region were developed.     

苏里格气田苏20区块气水关系研究

苏20区块是苏里格气田近几年投入开发的重要区块,伴随开发的不断深入,局部生产井出现了不同程度的产水现象。为进一步提高油气开发效率,通过引入水文地质学理论和方法,对地层水的化学性质进行了分析,利用矿化度和水化学特征系数(变质系数、脱硫系数、成因系数)等判别标志参数对产出水的类型进行了划分,系统研究了苏20区块岩性气藏的气水分布规律。认为产出水是天然气运聚成藏的产物,其分布受生气强度、砂顶微幅度构造、藏内温度、压力条件、天然气充注程度和储集层质量控制。     

掺钕磷酸盐玻璃的小信号增益性能

测试了应用于神光Ⅱ系列装置93片N31型钕玻璃的小信号增益系数。结果表明,Nd2O3质量分数为2.2%的钕玻璃平均小信号增益系数为0.0387 cm-1,Nd2O3质量分数为3.0%的钕玻璃平均小信号增益系数为0.0416 cm-1,两种浓度的钕玻璃不同样品间小信号增益系数的起伏范围分别为0.86%和0.76%。根据所测定的增益值,表明N31型钕玻璃的增益起伏符合神光Ⅱ系列装置要求,为实现该装置中每一路增益性能的平衡提供了有力保障,也为今后对更大尺寸钕玻璃增益性质的控制提供了经验。     

三孔干涉条件下部分相干电磁光束的偏振特性

推导了三孔干涉条件下的交叉谱密度矩阵,研究了该条件下部分相干光偏振特性的变化情况。比较了x、y方向场分量不相关和相关的情况,并与同样条件下双孔干涉的偏振度变化进行了对比。研究表明,偏振度在观察面上是振荡变化的,离中心越远振荡越剧烈;不同位置的偏振度传输足够长的距离后都将趋于稳定,其稳定值与参量Bxy和δxy有关,且离中心越远其偏振度达到稳定的传输距离越长;轴上偏振度与三孔的初始相干度是密切相关的。特别指出,当x、y方向场分量相关时,对应点偏振度的值远远大于其不相关的情况。     

Identification of rod dynamics under influence of Active Magnetic Bearing

The purpose of this paper is to apply the wavelet transform algorithm to identify the magnetic damping and magnetic stiffness coefficients of the drive rod with which a set of 4-pole Active Magnetic Bearing (AMB) is equipped. By taking advantage of time–frequency analysis feature, the ridge curve of rod free response after wavelet transformation can be extracted to find the natural frequency of the rod/AMB system. In other words, due to the influence of magnetized field by the AMB, the stiffness of the rod dynamics is not linear any more and can be estimated from the curve of the amplitude versus frequency by wavelet transformation. On the other hand, the nonlinear damping coefficients can be estimated from the derivative of amplitude versus amplitude by wavelet transformation of rod free vibration. It is found that the nonlinear magnetic damping coefficients are up to 2nd-order in polynomial and the stiffness coefficient is mainly of 3rd-order respectively. In addition, the identified 2nd-order damping coefficient is negative and hence implies that under specific rod displacement and speed, the dynamic of the rod/AMB system in axial direction is unstable.