吴起油田注气混相驱油的研究与分析

提高原油的采收率在油田的开发利用过程中是一个永久的话题,它贯穿在油田的开发过程中。注气的方式提高的采收率是一种的应用的相当好的提高的采收率方法,因为的注气效果的受到的很多的油藏条件的限制,所以在注气的之前的将注气候选的油藏的筛选与评价,是注气的能否的成功关键。     

浅谈高等学校的财务管理

教育的快速发展使得全国的高校不断的增多,对于高校的管理是教育部门的日常工作之一,而其中的财务管理具有着十分重要的意义,对高校的发展具有举足轻重的作用,良好的财务管理的体系有助于提高各大高等院校的办学效率和运营效率。研究主要分析了高校的财务管理包括的主要内容、目前的现状和存在的问题以及提高高校的财务管理的主要策略,希望对高校的财务管理提供一定的积极帮助。     

盾构联系测量

盾构的测量,是一个比较精细的过程,对盾构进行联系的测量,是想提高盾构的测量的精确度,同时也是施工的时候的必要的过程,测量的精确度,测量工具的使用,都?是在盾构的测量的时候的重点。本文就是基于对盾构的结构的分析,对测量的工具和测量的技术进行优化,从而提高测量的精确度。     

论石油化工设备防火措施

石油化学工业的不断发展,使之成为在国民经济的发展中它可谓是我国的支柱产业之一,在农业的发展、能源的发展、交通业的发展、还有电子机械等各方面的发展中,它都有着无可厚非的作用,同时为人民的生活也提供了服务与方便。但是当我们看到这些璀璨光辉的业绩的时候,我们也不得不考虑它的负面的影响,石油化工产业是一个十分危险的产业,一不小心引发的各种安全问题造成的人民的健康伤害还有财产安全问题是我们所不容忽视的,尤其是爆炸还有火灾,都有着巨大的破坏力,如何有效的预防,减少甚至说可以杜绝这种情况的出现,是每一个人所希望的,也是我们必须做的,本文通过一些常见的化工安全隐患还有引发的原因来探讨如何的有效的预防火灾和爆炸的出现。     

屋面防水建筑施工技术探究

在建筑的施工中,我们一直在强调建筑的质量的提高,保证建筑的质量和性能的保证,需要对建筑的施工的技术进行改善。作为建筑施工的主要的构架,施工的技术关系到了施工的质量和施工的效率。我们需要提高施工的技术,本文就主要研究了在施工的时候出现的主要的为他,分析出现这些问题的原因,并提出了改进防水的施工技术的方法。     

浅析公路路基施工工艺中的质量控制要点

公路的施工在现在面临的挑战是非常大的,主要是来自于车辆的行车速度在不断的提升,而且车辆的负荷也在增加,与是同时,车辆的数量也在逐渐的增多,这些因素都给公路的路基和路面带来了很大的影响。目前,公路的路基和路面的质量也在不断的提高,作为公路工程的基础,路基的质量会直接影响公路的使用效果,所以在进行公路施工的时候要对公路的路基的质量进行严格的控制。     

关于对水平井冲砂技术的研究与应用

随着我国科技水平的不断发展和石油工业的快速进步,我国的油田开采技术水平不断提高,油井技术的应用也越来越广泛。在这些力量的推动下,水平井的技术也是更上了大的台阶。常规的水平井修井的作业技术相对于普通的油井作业会有很大的不同,这主要是因为水平井的井身的特殊性,它的井段开始处是一段斜段,随之是很长的水平段,这就使得整个井筒的轴线是不规则的,因此对于水平井的修井施工作业会相应的复杂,技术应用也会存在一定的要求。本文就是从水平井的冲砂技术出发,对水平井冲砂技术的现状、水平井冲砂工艺的特点以及施工作业的设计应用进行简单的介绍。     

气体钻井施工存在问题及对策措施探究

随着社会经济的发展和科学技术的进步,使得世界能源的消耗总量不断的增加,市场能源的供需矛盾不断的激化。因而如何提升油气田的开采工艺技术的科技含量与油田实际的开采水平越来越备受关注,引发了许多人对这一技术领域的研究与探讨。而油气田的钻井作业目前也被纳入了高投入的行业,随着开采规模的扩大,钻井技术存在的问题越来越明显,尤其是气体钻井技术造成了钻井施工难度的增加,严重影响了油气田开发的进程。给整个油气田的生产带来严重的影响,影响了整个采油企业的社会经济效益的提高和企业的形象的建立。气体钻井的实际应用情况如何,其存在的问题有哪些,如何采取有效的措施来避免和解决存在的这些难题。通过对实际的生产情况进行分析,在分析的基础上对症下药,从而有效地解决问题。以期了解气体钻井的现状及存在的问题,通过掌握气体钻井解决的有效措施为实际中的油气田的钻井开采提供借鉴和指导,有效提高钻井施工的质量,提高企业的社会经济效益,促进钻井技术的整体水平。     

建筑机电设备安装中管线综合平衡技术

机电设备在我国的各行各业被广发的应用,尤其是建筑业的应用更加的广发。机电设备安装在建筑业中已是非常常见的了,建筑机电设备安装工程的综合管线平衡技术的成熟,对于提高机电设备安全和稳定的质量是非常重要的。机电设备安全性的提高对于国民经济的发展是起着至关重要的作用的,对国民的人身安全也是一种可靠的保障。     

关于化工废水处理常用技术的探析

进入新世纪以来,随着我国的经济持续的发展,工业废水的任意排放,给环境带来了很大的污染,在化工的生产的过程中,会排放大量的废水,这些废水的结构是非常复杂的,都是一些有毒以及有害的物质,是非常难降解的,处理的难度也是非常大的,成本也是相当高的。本文就是对化工废水处理常用的技术进行了简单的探讨。     

Thermal and air permeation properties of a carbon fiber/toughened epoxy based prepreg system

This study addresses thermal and air permeation properties of a new toughened prepreg system. Voids in the uncured prepreg structure can affect the void content in the final composite structure. A new, toughened prepreg system, commercially available for aircraft structural application, was utilized in this study. The prepreg was subjected to thermal and rheological characterization to understand the basic prepreg properties. These experiments were followed by a prepreg air permeation study to investigate prepreg processing and its influence on the prepreg structure. Crosslinking of the resin matrix was monitored with prepreg specimens without extracting resin from the prepreg. Along with thermal property measurements, the air flow rate significantly decreased in initial static experiments, followed by equilibrium permeability values. An air permeation model divided the air permeability into intralaminar and interlaminar permeabilities. Interlaminar air permeation was found to be more pronounced than intralaminar air permeation in this particular prepreg system. These permeation measurement results were explained using optical microscopy, proving that the application of vacuum could eliminate significant porosity in the laminate. Collectively, understanding prepreg thermal and air permeation properties was considered to be important; the voids in uncured prepreg may cause the voids in the final composite structure. Voids in the prepreg can be attributed to the heterogeneity and anisotropy of the toughened prepreg structure, resulting from particular prepreg processing techniques. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 5–16, 1997     

Analysis and characterization of prepreg tack

As part of an engineering analysis and experimental methodology to characterize prepreg tack, a compression-to-tension test was optimized to enhance reproducibility and generate intrinsic property data. With the resulting stress-strain compression and tension data, a theoretical model was developed to describe tack as a bulk viscoelastic property of a prepreg laminate stack. Using the viscoelastic analysis, four intrinsic material parameters to characterize prepreg tack could be defined. These were 1) relaxed modulus, 2) unrelaxed modulus, 3) relaxation time, and 4) initial void content of the prepreg stack. Relaxed and unrelaxed moduli of the prepreg stack were independent of temperature, while the relaxation time was highly dependent on temperature and matrix viscosity. In addition, the relaxation time was found to be influenced by resin/fiber content and prepreg surface characteristics, which also influenced the void content of the prepreg stack. Using these measured parameters, good agreement was observed between theory and experimental data for both the stress-strain curve of the tack test and the simplified compression tack index (CTI*), defined as the ratio of output energy of the prepreg stack during tensile unloading to input energy during compressive loading.     

Self-adhesive honeycomb prepreg systems for secondary structural applications

Porosity in cured honeycomb parts was investigated using model prepreg systems and compared with a commercial solvent produced prepreg. Woven glass fabric was used as the reinforcement in both of the systems. Three main solvents were identified in the commercial prepreg. These solvents were found to cause porosity or reduce thermal properties in model solvent prepreg based laminates when used either separately or in combination. Lowering the solvent content reduced the porosity in the prepreg but was limited by resin staging. The high level of porosity, resulting from solvents, found in these commercial prepreg systems motivated the investigation of the feasibility of changing the method of impregnation from solvent to hot-melt. Hot-melt model prepreg produced essentially void-free laminates as well as honeycomb parts. Model prepreg produced by hot-melt impregnation was found to be more robust, providing the capability of changing the degree of resin impregnation in the fiber bed. A low level of impregnation resulted in the best fillets to the honeycomb core, while still producing essentially void free parts. The use of both solid and liquid carboxyl-functional elastomers was incorporated in the epoxy based resin to provide flow control and self-adhesive characteristics. Mechanical properties of both the model hot-melt and commercial prepreg based honeycomb structures and laminates were compared. The model hot-melt prepreg was found to have better cured properties along with the necessary prepreg characteristics providing an optimized self-adhesive controlled flow prepreg system.     

浅谈碳纤维预浸料中铺放纤维非织造网布的适用性

选取了两种纤维非织造网布,分别在进口单向碳纤维预浸料和国产单向碳纤维预浸料层与层之间进行铺放,采用预浸料成型工艺制备不同性能的层合板,并通过测试层合板试样的力学性能和孔隙率,表明纤维非织造网布在碳纤维预浸料成型技术中的适用性。对比测试数据结果发现:纤维非织造网布经向纤维纤度、纬向纤维纤度、面密度选材合适时,在碳纤维预浸料层合板中表现出了优异的适用性;纤维非织造网布经向纤维纤度及纬向纤维纤度较小、面密度选择较大时,在碳纤维预浸料层合板中虽然也表现出良好的工艺适用性,但是碳纤维预浸料层合板的力学性能会降低,孔隙率会偏大。     

基于变活化能模型的T800/环氧树脂预浸料固化反应动力学研究

为了深入了解某新型高温固化T800/环氧树脂预浸料的固化行为,借助差示扫描量热仪(DSC),采用非等温DSC法研究了T800/环氧树脂预浸料的固化反应过程。基于唯象模型,系统研究了该预浸料的固化反应特征温度及固化动力学参数,确定该预浸料中环氧树脂的固化反应动力学模型为自催化模型。采用等转化率法,分析了预浸料中环氧树脂的反应活化能随固化度的变化情况,结果表明在整个固化反应过程中,树脂固化反应活化能变化较大,传统模型法基于全固化过程活化能不变的假设无法准确描述该固化反应。采用变活化能自催化模型,利用粒子群全局优化算法,得到了T800/环氧树脂预浸料的固化动力学方程,结果表明该模型能较好地描述实验现象,可为进一步研究该预浸料的热力学性能及其成型过程中的质量控制提供理论基础。     

Structural Carbon/Epoxy Prepregs Properties Comparison by Thermal and Rheological Analyses

Two different carbon/epoxy prepreg materials were characterized and compared using thermal (DSC, TGA, and DMA) and rheological analyses. A prepreg system (carbon fiber preimpregnated with epoxy resin F584) that is currently used in the commercial airplane industry was compared with a prepreg system that is a prospective candidate for the same applications (carbon fiber prepreg/epoxy resin 8552). The differences in the curing kinetics mechanisms of both prepreg systems were identified through the DSC, TGA, DMA, and rheological analyses. Based on these thermal analysis techniques, it was verified that the curing of both epoxy resin systems follow a cure kinetic of n order. Even though their reaction heats were found to be slightly different, the kinetics of these systems were nevertheless very similar. The activation energies for both prepreg systems were determined by DSC analysis, using Arrhenius's method, and were found to be quite similar. DMA measurements of the cured prepregs demonstrated that they exhibited similar degrees of cure and different glass transition temperatures. Furthermore, the use of the rheological analysis revealed small differences in the gel temperatures of the two prepreg systems that were examined.     

近红外光谱技术在酚醛预浸布中的应用

为了对预浸布进行快速检测,采用近红外漫反射的方法对高硅氧/酚醛预浸布,碳/酚醛预浸布中的树脂含量、可溶树脂含量和挥发份含量进行在线监测,三项指标同时显示.通过偏最小二乘方法分别建立标准模型,用模型的评价指标评价,分析未知样品.用近红外方法在1 min之内同时分析出结果,没有破坏性.用近红外的测定结果和标准方法的测定结果相比,两者不存在显著性差异.近红外光谱的方法可以应用在酚醛预浸料生产线上.     

Effects of ambient aging of 5245C/graphite prepreg on composition and mechanical properties of fabricated composites

A bismaleimide modified epoxy 5245C/graphite prepreg was subjected to ambient conditions for periods up to 140 days. The effect of this ambient aging on the prepreg composition and mechanical properties of composites fabricated from aged prepreg was investigated. The results show that small but definite composition changes occur as a result of ambient aging. These compositional changes are also reflected in small decreases in shear and flexural properties at room and elevated temperatures, dry and wet.     

炭纤维预浸带表面状态的影响因素及改进机理研究

通过对不同结构预浸带的对比研究,得出了具有良好表面状态单向预浸带所具有的结构,并且从微观上研究了纤维与树脂的结合方式,得出了影响其表面状态的原因。通过对树脂体系的改进,使纤维能够处于树脂体系的交联结构之中,提高了横向撕裂强度,从而改进了单向预浸带的表面状态。     

两种预浸工艺对玻璃布预浸料性能的影响

着重研究了用溶液法和热熔胶膜法工艺所制备的5231/823玻璃布预浸料的物理性能、工艺性能、力学性能和滚筒剥离性能,旨在探讨不同预浸工艺对预浸料及其复合材料性能的影响,试验结果表明:这2种工艺所制的5231/823预浸料的工艺性能和剥离性能相当,但在预浸料树脂含量控制精度方面,热熔法工艺高于溶液法工艺;在预浸料挥发分方面,热熔法工艺的较低,一般低于0.8%。在复合材料常规力学性能方面,一般前者高于后者。