水平井井筒气两相流动规律及积液特征研究

由于气田开发中出水气井所占比例逐年增加,明确水平井井筒气两相流动规律及积液特征对于解决气井出水问题具有重要意义。然而,水平气井出水特征规律复杂、无法准确预测积液风险,导致水平井井筒气两相流动规律及积液特征尚不清楚。因此,从水平气井气水两相流动规律研究入手,通过建立水平井气水两相渗管耦合流动模型,我们可以对水平井复杂完井段的积液过程进行深入的数值模拟分析。并在总结前人成果的基础上,深入探讨了水平气井的气水两相流动规律,同时研究了积液过程的携液模型和积液模型。研究结果表明,水平井筒内的气两相流动有多种流型,有分层流、间歇流、环雾流等。这些流型受多种因素影响,如管径,倾角,流体性质等。特别是影响空气和水流类型最显著的是管径和倾斜度。积液过程受到各种因素的影响,如气量、水量、轨迹上的倾角以及轨迹的起伏程度等。

探讨ICU脓毒症患者胸腔积液特征及死亡的相关危险因素分析

对脓毒症患者的致病因素进行分析。方法 本次实验以2020年4月-2021年4月我院收治的60例老年ICU脓毒症患者作为此次的调查对象,根据是否死亡分为死亡组和好转组。收集两组基础资料、入院48小时最差实验室指标、主要干预治疗措施及预后。分析ICU脓毒症患者死亡危险因素。结果 60例患者好转出院43例,死亡17例,病死率28.33%、丙氨酸转氨酶(ALT)、天冬氨酸转氨酶(AST)、乳酸、休克是ICU脓毒症患者死亡的独立危险因素,24小时尿量、机械通气(MV)的使用是ICU脓毒症患者死亡的保护因素,死亡组胸腔积液占比为70.59%,明显高于对照组的25.58%,死亡组患者胸腔积液大量(52.95%)和中等量(35.29%)的比例明显多于好转组的大量(9.30%)和中等量(25.58%)。结论 ALT、AST、乳酸、休克、24小时尿量、MV的使用,以及胸腔积液的分度量对ICU脓毒症患者预后具有重要意义。

Geochemical characteristics of hydrothermal sediments from Iheya North Knoll in the Okinawa Trough

Thirty sediment subsamples were recovered from the Iheya North hydrothermal field （with an average of 38 m away from the hydrothermal vent） in the middle Okinawa Trough. Samples were obtained by the ROV （Remote Operated Vehicle） Faxian during the virgin cruise of the R/V Kexue in 2014 with the application of push cores. The chemical compositions of the sediments show that the hydrothermal sediments near the hydrothermal vent are mainly composed of SO3, ZnO and Fe203. Moreover, the hydrothermal sediments are also highly enriched in Pb, As, Sb, Hg, Se, Ag, Ba, Mo and Cd comparing with previous analysis results. On the other hand, the concentrations of St, Hg andAg in studied sediments are strongly and positively correlated, these elements can be used as an hydrothermal indicator. In addition, a factor analysis of the sediments suggested that the sediments were mainly influenced by hydrothermal origin, and terrestrial and biogenic input are limited in studied area. It is also suggested that different stages of crystallization were involved in the formation of hydrothermal chimney from factor analysis.