春光油田白垩系储层机械防砂筛管性能评价与优选实验

机械筛管是防砂井井下防砂管柱的关键组成部分,其类型和性能决定了挡砂效果和油井防砂后产能以及总体服务期限。春光油田白垩系储层为疏松砂岩易出砂储层,为了选择合适的机械防砂筛管类型,使用自行研制开发的挡砂介质性能评价径向流驱替实验装置,模拟春光油田地层砂和生产条件,对割缝筛管、复合精密筛管、绕丝筛管、金属棉滤砂管等四种类型的筛管样品进行了性能评价实验。根据动态实验数据,研究提出了筛管的流通性能、挡砂性能及其评价指标的计算方法,系统地评价了四种筛管的流通性能、挡砂性能并得到了具体的量化评价指标。实验综合对比表明,对于春光油田白垩系储层,割缝筛管的挡砂性能和流通性能均较低;金属棉滤砂管的挡砂性能最好但堵塞后的流通性能较差;绕丝筛管的两项指标均衡但总体偏低;复合精密筛管的两项指标相对均衡并均比较高,推荐作为春光白垩系储层首选的机械防砂筛管类型。     

论维吾尔医沙疗对骨质层的转移及力学特性的影响

本文以研究维吾尔医沙疗对骨质层的转移及力学性能的影响为目的,建立好股性关节炎模型的30只新西兰大白兔作为研究对象,由沙疗时间长短之差异将所有兔子分为三组并进行沙疗。在此期间进行四次CT扫描,计算出各股骨骨质层的总体积且统计分析骨质层的转移。取三组兔子左右股骨进行三点弯曲实验。实验结果表明,病态兔子股骨硬质骨和密质骨的增加速度比正常股骨低,而软质骨的减少速度基本一致;软质骨在向硬质骨和密质骨转化;正常兔子股骨的挠度、最大抗弯强度和最大抗弯正应力比病态兔子股骨要高,沙疗会促进股骨骨质层的转化,且改善股骨基本力学性能。     

沙漠砂锂渣聚丙烯纤维混凝土基本力学性能试验研究

通过试验分析了3 d、7 d、28 d时不同沙漠砂替代率对锂渣聚丙烯纤维混凝土立方体抗压强度、轴心抗压强度和劈裂抗拉强度的影响规律。结果表明:在锂渣掺量20%,聚丙烯纤维1.5 kg/m3时,利用沙漠砂替代锂渣聚丙烯纤维混凝土中细度模数小于3的工程用砂成效显著,具有深远的社会意义和优越的经济价值。随着沙漠砂替代率增大,沙漠砂混凝土抗压强度和劈裂抗拉强度均呈先增大后减小趋势,其中当沙漠砂替代率为30%时为最优掺量,较基准组28 d抗拉强度提高53.26%。     

JTS人工井壁防砂技术的研究与应用

随着文中油田进入高含水开发阶段,由于强注强采,降低了地层胶结强度,油水井出砂日趋严重。部分井出现砂埋油层甚至套管损坏现象,常规的化学固砂有效期短,防砂效果不理想。为此,2010年来,开展了JTS人工井壁防砂技术的试验应用,通过施工工艺的创新与改进,取得了成功,为遏制中后期开发油田出砂,闯出了一条新的途径,具有较好的推广价值。     

砂泥交互储层定向井压裂裂缝穿层扩展真三轴实验研究

对于低渗透砂泥互层储层,为沟通更多砂岩层并增加泄油面积,通常采用斜井结合水力压裂技术进行开发。与直井和水平井相比,斜井中水力裂缝的起裂、转向形态复杂,而近井区域的裂缝复杂程度决定了压裂效果。针对储层中砂泥互层的情况,利用物理模拟实验,研究了砂泥互层中不同钻完井参数及地应力条件下水力裂缝起裂、转向和垂向扩展形态。研究结果表明:方位角和水平应力差对裂缝扩展能力有很大影响,当方位角较大,水平应力差较小时,近井区域裂缝扭曲程度大,数量多,不利于裂缝垂向扩展和施工后期加砂;泥岩层会阻碍裂缝垂向扩展,砂岩层与泥岩层之间应力差越高,阻碍作用越大,裂缝越不容易从砂岩层进入泥岩层。根据实验所得结论,提出了组合及分层压裂的判断依据。     

高铁离子涂丝电极的研究与应用

本文报道了以苄基十四烷二甲基四氯高铁酸铵为电活性物质的PVC涂丝电极测定Fe(Ⅲ)的方法。该电极对FeCl_4~-离子的Nernst响应范围为10~(-4)—10~(-1)M,极差为56mV(25℃)。检测下限为1.6×10~(-5)M,内阻3MQ左右。电极的再现性、选择性、响应时间均较好。该电极用于铁矿石中铁含量的测定结果满意。     

内蒙古多伦沙地植物园种子植物区系分析

对内蒙古多伦沙地植物园植物科属的区系特征进行了统计分析,发现种子植物较丰富,优势科属现象较明显;植物属的分布型特征表现出本地区植物区系的温带性质;由于植物园以固定、半固定沙丘为主,生活型特征表明其多年生草本植物占绝对优势,乔木和灌木的种类较多。     

用FDTD方法计算二维各向异性涂层目标的RCS

给出了计算二维情况各向异性介质物体散射的时域有限差分 (finitedifferencetimedomain ,FDTD)方法公式 ,讨论了编程时应注意的问题。用FDTD方法计算了各向异性有耗介质涂层目标的雷达散射截面 (radarcossse tion ,RCS) ,说明这种介质涂层能够缩减金属目标的RCS。     

Luminescence chronology of ＂Old Red Sand＂ in Jinjiang and its implications for optical dating of sediments in South China

A weathered deposit in South China is widespread on the coastal areas of Fujian and Guangdong provinces, China. This deposit consists of slightly cemented, medium- to fine-grained sands, and is characterized by its colors of red, brown red, light reddish brown or dark yellowish orange, and is usually called ＂Old Red Sand＂. The uncertainty in its formation age has been a major obstacle to the study of this type of deposit. In this paper, optically stimulated luminescence （OSL） techniques were used to date the ＂Old Red Sand＂ sediments from Jinjiang, Fujian Province, China. The effect of the geochemical behavior of uranium and thorium in sediment during chemical weathering on estimation of annual dose was investigated. The results show that the change in annual dose due to weathering poses a major problem for the optical dating of such weathered sediments. The optical dating of these weathered deposits will produce erroneous ages if average annual dose during burial cannot be correctly estimated. For the profiles studied, the OSL dates obtained on samples from the upper part do not represent the burial age of the samples. It is highly likely that they are underestimated due mainly to the accumulated radioactive elements as a result of chemical weathering. It is concluded that changes in annual dose due to chemical weathering must be considered when dating similar sediments in South China. With a detailed analysis of the OSL dating results, the chronology of the marine terraces in this area was suggested. The lowest terrace was formed at -3.5 ka and the second terrace was dated to -74 ka. The age of the highest terrace may not be established accurately, but is inferred to be older than the apparent OSL date of -77 ka and so is the Paleolithic artifacts from it.     

砂体精细雕刻技术在庄海8断块沙河街组的应用

大港油田埕海一区庄海8沙河街组为三角洲沉积储层,储层横向变化大,砂体物性和连通性差,厚度变化大。针对这一特点,在提高地震分辨率基础上,应用模型反演及属性提取技术进行薄砂体精细雕刻研究,落实储层展布规律。该技术的成功应用,提高了储层预测水平,方案实施效果显著。