三种套管接头抗压缩性能研究

针对套管接头抗压缩强度问题，使用全尺寸实物试验的方法对几种不同钢级、不同螺纹形式的套管接头的抗压缩强度进行了对比试验，并借助材料力学和有限元方法对试验结果进行了分析。实物试验中出现了管体失稳和接箍跳扣两种套管接头压缩失效形式。试验结果和分析结果表明，N80、P110钢级材料的压缩屈服强度高于拉伸屈服强度；偏梯形螺纹套管接头的压缩屈服强度比同钢级、同壁厚特殊扣螺纹套管接头低6.7%～7.7%；上扣是否到位，直接影响套管接头部分的抗压缩能力，上扣不到位的特殊螺纹套管接头的抗压缩性能甚至低于偏梯形螺纹接头。同时指出，为了保证上扣质量，不应使用浮动上扣方法，管柱设计中应进行抗压缩强度设计。     

Drainage and imbibition relative permeabilities at near miscible conditions

The changes in gas and oil relative permeabilities as miscibility is approached are of particular importance in multi-contact miscible displacements. These changes are a function of the detailed phase behaviour of the fluids and their physical properties as well as the properties of the porous medium itself.In this work, we investigate the behaviour of two-phase drainage and imbibition relative permeability curves of four, different, equilibrated fluid pairs from a three component, two-phase system (cyclohexene, isopropyl alcohol and water) that exhibits a critical point at ambient conditions. The tie-lines of these fluid pairs are at varying distances from the system's critical point. Equilibrium phase compositions and interfacial tensions (IFT) were determined for each of the four fluid pairs. Dynamic displacements were then performed in a linear two dimensional, bead-pack. Unsteady state, drainage and imbibition relative permeabilities were determined for the various pre-equilibrated mixtures. The experimental results show a clear change in relative permeability as the fluid pairs approach the critical point. As the interfacial tension decreases the non-wetting phase relative permeability increases more rapidly than the wetting phase relative permeability and hysteresis becomes less important.Two correlations [Coats, K.H., 1980. An equation of state compositional model: SPE J, 20 (5): 363-376.; Whitson, C.H., and Fevang, Ø., 1997. Generalized pseudo pressure well treatment in reservoir simulation. In Proc., IBC Conference on Optimization of Gas Condensate Fields.], commonly used to model the changes in relative permeability with interfacial tension, and the development of miscibility, were compared with the experimental data. The Coats correlation, which uses a single adjustable parameter to model the changes in both relative permeabilities and residual oil saturation as a direct function of the IFT, yielded an unacceptable match to the experimentally determined fractional flow. However the Whitson–Fevang correlation, which relates the changes in relative permeability to the capillary number using two adjustable weighting functions, presents a satisfactory match.     

大截面导线一牵二张力架线的要点及措施

利用现有的牵张设备和工器具，在三峡至广东500kV直流输电线路工程中，分两次一牵二张力展放大截面导线（ACSR-720／50）。这种施工工艺，在紧线及附件安装过程中采取的不同于以往的措施，起到了很好的效果，既安全可靠，又节约一次性投资。     

挡土墙填土曲线破裂面的地震主动土压力分析

在地震作用影响下，墙后填土处于极限平衡状态时，假定破裂面为一条通过墙趾的旋轮线。从墙后土楔中取出一微薄水平层，研究其在水平惯性力下的平衡，得到的地震土压力分布和土压力合力作用点位置均与实验结果相吻合。     

铅黄铜水平连铸棒材熔铸工艺的试验研究

在工业生产条件下，对影响HPb59－1水平连铸律材热轧开裂的熔铸工艺进行了试验研究．取三个熔铸工艺因素：铸造速度、冷却水压力、冷却水温度．试验结果表明；铸造速度对热轧开裂影响极为显著，使其控制在410mm／min左右可获得较为理想的效果．     

非反应性共聚物增容剂的作用

简述了共聚物增容剂在聚合物熔融共混物中的作用方面的研究进展。阐述了A-B、A-C和D-E型非反应性共聚物增容剂。重点介绍了增容剂的分子量、用量对聚合物共混物的界面张力、相畴尺寸和聚结的影响。     

SURFACE TENSION AND BUOYANCY DRIVEN INSTABILITIES IN A LAYER OF LIQUID TIN HEATED FROM BELOW

The linear theory of Pearson (1958) and Nield (1964) is modified here to study liquid tin and include the finite thermal resistances of the bounding layers of boron nitride, copper and air (∼10^-2 torr) in the experiments of Ginde et al. (1989). The magnitude of the ΔT_c across the layer of liquid tin required for the onset of convection depends on the ratios of the thermal conductivities and thicknesses of the supporting layers of boron nitride and copper to those of the tin.

According to our theory surface tension contributes more than buoyancy to the instability observed experimentally. The critical ΔT_c observed required for the onset of convection in the layer of tin, is up to 25% lower than that predicted, which shows the layer is less stable than the theory indicates. Thus the surface of the tin was uncontaminated, or a significantly larger observed critical ΔT_c would be expected.

The boundary condition on the thermal fluctuations at the base of the supporting layer of copper does not appear to be important in these experiments. However, the thermal resistance of the boron nitride would have to be assumed to be unrealistically large to obtain agreement within experimental error with the theory.     

热采水平井整体开发草13块砂砾岩薄层特稠油

热采水平井技术是科学有效开发稠油油藏的重要手段。以胜利油田草13块为例，系统论述了利用热采水平井整体开发具有边底水的砂砾岩薄层特稠油油藏的开发程序和研究方法。在油蒇精细描述的基础上，通过热采筛选、产能评价、直井和水平井数值模拟、开发方式优化及指标预测等油藏工程研究技术方法，综合论证了利用热采水平井整体开发草13块的必要性和可行性，总结了砂砾岩薄层特稠油油藏水平井油藏工程设计中应遵循的原则，并在生产实践中见到明显效果，为胜利油田其它区块和类似油田的开发提供了借鉴和指导。     

Interfacial tension between coexisting polymer solutions in mixed solvents and its correlation with bulk thermodynamics: phase equilibria (liquid/gas and liquid/liquid) for the system toluene/ethanol/PDMS

Vapor pressures, phase equilibria and interfacial tensions σ were measured for solutions of poly(dimethylsiloxane) (PDMS, M_w[equals]75 kg/mol and M_n[equals]50 kg/mol) in mixed solvents of toluene (TL) and ethanol (EtOH) at 30, 40, 50 and 60 °C. The experimental ternary phase diagrams can be modeled quantitatively from the determined concentration and temperature dependent binary interaction parameters χ_ij if the experimentally inaccessible composition dependence of χ_EtOH/PDMS is adjusted. The relations between σ and the equation of state of the system differ from that applying to single solvents. The exponents as well as the amplitude prefactors of the corresponding scaling laws (e.g. the dependencies of σ on the length of the tie lines or on the hump energy, i.e. on the intrusion into the two phase regime quantified in terms of Gibbs energies) change considerably with temperature. However, this variation can be reduced significantly by normalizing the independent variables. Dividing the length of the tie lines by the length for the corresponding binary subsystem proves more efficient than the distance of these tie lines from the critical point of the ternary system relative to the maximum distance of the binary subsystem. A combined normalization does not improve the situation.     

水平井生产测井技术应用

通过技术合作，对水平井生产动态监测测井技术进行了探索，取得了一定效果。介绍了水平井产出剖面测井的关键技术。介绍了将测井仪器送入水平钻穿的地层中的3个传输测井工艺，包括钻杆传输方法、柔性管传输方法和井下牵引输送方法；介绍了所采用的测井系列，重点分析解决油汽水三相分离问题的测井方案；介绍了水平井测井资料的解释和评价技术；通过模拟实验，确定井中4种流体流型，提出持液率关系式和流量测井响应关系式。