孤北1断块蒸汽吞吐稠油油藏化学解堵技术

孤北１断块是孤岛油田典型的稠油油藏,以蒸汽吞吐方式投入开采以来,注汽压力高,生产效果很差,采用常规酸化多次均不见效。本文报道了孤北１断块岩心敏感性分析结果,针对油层伤在的主要原因研制的复合解堵剂ＳＤ－４的组成、性能及作用机理,简介了７口井解堵效果。     

The effect of blockage on tidal turbine rotor design and performance

The performance-enhancing effects of closely packing tidal turbines in single row arrays (tidal fences) are evaluated in this computational study. Infinitely long tidal fences are simulated with a range of lateral rotor spacings using a blade element momentum method embedded in a Reynolds averaged Navier–Stokes solver (RANS-BEM).First, a rotor design tool is applied to determine a hydrodynamically optimal rotor design for each lateral spacing. In the RANS-BEM method, the effect of blockage (the ratio of rotor swept area to channel cross-sectional area) on rotor optimization is accounted for. Increased blockage is found to result in increased optimal solidity and decreased optimal pitch. Next, each rotor design is simulated in its design spacing as well as several off-design spacings. The resulting power coefficient is largest when the rotor optimized for the highest blockage case operates in the array with the closest lateral spacing. Further, although a rotor's performance is improved through operation at a blockage higher than its design point, it still exhibits inferior performance relative to a rotor designed for that higher blockage. The results indicate that blockage must be considered in the rotor design process if the optimal rotor efficiency for a given spacing is to be achieved.     

The influence of non-uniform blockages on transient wave behavior and blockage detection in pressurized water pipelines

Blockages in piping systems are formed from potentially complex combinations of bio-film build up, corrosion by-products, and sediment deposition. Transient-based methods seek to detect blockages by analyzing the evolution of small amplitude pressure waves. In theory, such methods can be efficient, nearly non-intrusive and economical but, thus far, studies have only considered symmetrical blockages, uniform in both the radial and longitudinal directions. Laboratory experiments are described here that involve pipe blockages with various levels of irregularity and severity; the way the transient response is affected by a non-uniform blockage is investigated. The differences between uniform and non-uniform blockages are quantified in terms of the rate that wave envelopes attenuate and the degree that phases are shifted. Two different methods for modeling these impacts are compared, namely through an increase in pipe roughness and through a wave scattering model. Wave scattering is shown to play a dominant role in explaining both wave envelope attenuation and phase shift. The accuracy of existing transient-based methods of blockage detection in the frequency domain is also examined, and is found that the predictions of rough blockage locations and sizes by current method are in good agreement with data, with relatively larger discrepancies for rough blockage lengths.     

地铁工程水处理设备调试中出现的问题和防治措施

水处理设备对冷冻、冷却循环水进行处理,使循环水水质稳定在设计的循环水水质范围的成套装置,由具备水质处理、水质过滤、水质监测、全自动控制及通讯接口等功能所组成的设备。根据对北京市地铁6号线工程水处理设备的调试经验,对水处理设备调试中出现的问题进行了详细的分析和总结,并给出了具体的防治措施。     

RIK80-4型空压机运行效率下降、导叶波动原因分析及解决方法

简要介绍南钢2#20000m3/h空分设备RIK80-4型空压机运行效率下降情况,详细分析空压机效率下降原因,介绍了空压机导叶波动原因及处理方法、中间冷却器翅片氧化腐蚀原因及国产化使用后取得的效果,处理后空压机效率明显提高。总结了一些相关经验。     

粒料振动分选器的堵塞与改进

针对洛阳石化聚丙烯装置拉料振动分选嚣Z507的能力不足出现堵塞、影响造粒机组运行的原因进行分析,并分别采取了扩大第一层下料孔直径、抬高物料入口端高度、增加物料入口面积、提升第一层物料的空间高度和增加振动强度的改进措施,取得了良好的效果。     

HB复合解堵技术在二连低渗透油田的应用

根据二连阿南，哈南低渗透砂岩油田的地质和开发特征及造成油层污染的主要原因。研制了以溶蜡，胶质沥青为主的HB有机解堵剂配方和以清除酸溶盐，铁的腐蚀产物，粘土颗粒及乳化水堵塞为主的HB无机解堵剂配方。介绍了HB复合解堵技术解堵机理。解堵剂性能和现场施工工艺。在二连“两南”低渗透砂岩油田现场应用取得了较好的效果。     

管道结垢成因及抑制方法

本文在分析了一铅锌矿选厂输送溶液及管道结垢成分的基础上，探讨了管道结垢的原因；通过实验室试验，研制了以聚氨酯树脂为成膜物，以阻垢添加剂为辅助成分的功能阻垢涂料，并在该选厂现场进行了工业试验，取得了良好的阻垢效果。     

Experimental Study on Particle Deposition and Blockage in Small-Size Straight Fracture Channels

Based on the technology of using particles to block air-leakage fractures around drainage boreholes, pneumatic conveying experiments were conducted to explore the mechanism of particle deposition and blockage in fractures. Two small-size straight fractures (1000 mm × 40 mm × 2 mm and 1000 mm × 40 mm × 4 mm) were performed. The experimental results show that for the conditions under which fractures could not be blocked, average deposition height fluctuates around a certain value. This value is significantly influenced by air pressure but little impacted by mass flow rate. The average deposition height fluctuates sharply when solid flow rate increases. The effective blockage length curve slowly increases followed by a fast decrease. According to the effective blockage length, the optimum blockage effect is obtained at mass flow rate of 0.042 kg/s and air pressure of 0.25 MPa for a 2 mm-wide fracture, while for a 4 mm-wide fracture, the optimum blockage effect is obtained at mass flow rate of 0.042 kg/s and air pressure of 0.15 MPa. Both air pressure and fracture width have approximately equivalent effects on the blockage time, whereas mass flow rate does not contribute a noticeable effect.