共查询到20条相似文献,搜索用时 84 毫秒
1.
2.
防喷器的密封检测是防喷器日常检修的必要手段,目的是为了保证防喷器正常发挥其重要的作用,确保钻井作业安全.防喷器密封检测中最常遇到的是泄漏问题,常常由于泄漏部位的隐蔽性和防喷器的高压危险性,使得泄漏位置不能快速准确被发现.利用声发射高灵敏度的特性,结合防喷器的声波传播特性,在大量试验的基础上总结出防喷器泄漏的声发射检测布点方式、分析方法和判断依据,为其他石油设备泄漏检测提供参考. 相似文献
3.
4.
利用PAC24通道SAMOS声发射检测系统实时采集16Mn钢板在不同电流强度下手工电弧焊焊接过程中的发射信号,并进行相应的参数分析和频谱分析处理,探究在不同电流下手工电弧焊焊接过程中的声发射信号特性。实验结果表明,当电流大于标准电流时,对声发射信号中的计数、能量、幅值之间的关系没有太大的影响,总计数与总能量都随时间平稳增加,幅值主要分布在500~850dB,两通道的总计数和总能量都分布在65~95dB,频率主要集中在45kHz。当电流小于标准电流时,只有两通道的总幅值对时间的关系有变化,达到了1 300~600 dB,并且每一个时刻的幅值都远大于标准时的值。 相似文献
5.
6.
简单介绍了声发射检测原理及声发射源定位方法,并且采用声发射检测技术,对5×104 m3常压储罐底板进行了声发射在线检测,在对储罐进行资料审查和现场勘察的基础上制定了声发射检验方案,确定了传感器数量、安装位置并调试了检测仪器。检测结果表明底板出现轻微腐蚀,且有局部集中的现象。通过分析超声波测厚开罐检验罐底的实际情况,表明声发射检测技术可以对储罐的安全生产进行监控与评价。 相似文献
7.
韦淡平 《石油学报(石油加工)》2002,18(4):8-17
与柴油的润滑机理不同,汽油基本上依靠本体组分润滑,笔者从高频往复试验机(HFRR)试验中汽油的磨损现象入手,详细讨论了汽油的润滑机理,非常低的粘度和含量很少的天然极性抗磨杂质使汽油无法在软的下试块上形成有效的保护膜,导致严重的粘着磨损和金属转移。汽油润滑性涉及许多复杂的,相互关联的因素:汽油中的水、含氧掺和物、双烯烃、双芳烃和极微量杂质的存在,汽油的挥发性,粘度效应,以及不同磨损机理的协同作用。汽油在贮存过程中的氧化对汽油的磨损机理也有显著的影响。 相似文献
8.
储层裂缝研究的新方法——声发射实验 总被引:19,自引:4,他引:15
郑荣才 《石油与天然气地质》1998,19(3):186-189
声发射活动对地质体载荷历史中的应力场期次和破裂强度记忆力特征,即Kaiser效应是声发射实验的基本原理,它是建立在测试岩芯或露头样品上的一种研究储层裂缝的新方法。以辽河古潜山油藏为例,此方法不仅能有效的划分潜山裂缝期次,亦能判别潜山储层破裂强度及性质等复杂地质问题,颇具应用前景。 相似文献
9.
10.
《石油化工应用》2016,(6):61-64
随着社会对能源需求的日益增长,页岩气作为一种新型清洁能源受到全球热点关注。本文以四川盆地龙马溪组页岩为研究对象,通过对页岩进行了单轴压缩条件下声发射试验,并使用MATLAB对页岩的累积能量进行统计分析,研究了页岩的力学特性和声发射特征。研究结果表明:(1)通过单轴压缩试验,得到的页岩峰值强度在125.34 MPa~147.80 MPa,弹性模量在4.09 GPa~6.73 GPa。(2)单轴压缩下,页岩的声发射计数、累计能量与其应力之间具有良好的关联性。(3)页岩的声发射能量分布服从幂减定律p(E)~E~(-γ),γ的分布主要集中在0.5附近。 相似文献
11.
12.
Devaraj Rangabashiam K. Logesh U. Yashvanth Ganesan Subbiah 《Petroleum Science and Technology》2019,37(18):2018-2024
This work examines the effect of particle size of silicon oxide (SiO2) nanoparticle on the emissions characteristics of four-stroke, single cylinder water-cooled diesel engine fueled with neat diesel (D100). Silicon oxide as an additive in various particle-size of 10?nm and 20?nm is included to D100 and termed as D100SiO210 and D100SiO220. The experimental result proved that the CO and HC emissions are 3.3% and 3.7% lower for D100SiO210 than D100 at 3.5?bar BMEP. SiO2 nanoparticle further reduces CO and HC emissions by 3.2% and 2.6% correspondingly for D100SiO220 than D100. The degree of NOx emission in D100 is 4.6% higher at 3.5?bar BMEP. When compared to D100, tailpipe NOx emission was found to be 1.7% and 2.6% lower when fueled with D100SiO210 and D100SiO220. In addition, the tailpipe smoke emission was found to be 0.7% lower when fueled with D100. 相似文献
13.
14.
文章对柴油机多参数故障诊断法进行了研究.实际应用表明,该方法能够诊断出柴油机的常规故障,并能根据多个参数的诊断结果给出柴油机的总体技术状态,指导技术人员对柴油机做出维修保养决策,基本能够满足油田钻井公司对现场使用的柴油机进行故障诊断的需要. 相似文献
15.
16.
《Egyptian Journal of Petroleum》2022,31(3):11-19
The study sought to investigate the combined impact of parsley biodiesel blend (PSB) proportion, engine speed, and load on diesel engine parameters. The obtained result revealed that an increase in the proportion of PSB blend as the load increases, led to a rise in brake thermal efficiency (BTE), oxides of nitrogen (NOx), and a decline in brake specific fuel consumption (BSFC), carbon monoxide (CO) and brake specific energy consumption (BSEC) but no interactive effect of both factors hydrocarbon (HC). Also, varying the engine speed and proportion of PSB blend declined BSFC, BSEC, HC, and NOx bur raised BTE and CO. A blend of 20.22%, engine speed of 1483.39 rpm, and engine load of 95.88% were the best variables for the tested engine to achieve better performance and reduced emission utilizing the desirability-based method. The projected values for BTE, BSFC, BSEC, CO, HC, and NOx responses were 20.61%, 0.32 kg/kWh, 6.14 MJ/kW, 0.08963%, 18.28 ppm, and 347.72 ppm respectively. Furthermore, for the tested engine, the engine speed was determined to be the most significant variable (with the most influence) when compared to the engine load and fuel blend. This study is beneficial to researchers and organizations working on improving engine performance and reduction of toxic emissions to the environment. The optimization study can also help overcome the high cost and lengthy experimental techniques. 相似文献
17.
18.
Ashok Kumar Yadav M. Emran Khan Amit Pal Uttam Ghosh 《Egyptian Journal of Petroleum》2018,27(1):89-93
In this study, the performance and emission characteristics of biodiesel blends of 10, 20, 30 and 50% from Schleichera Oleosa oil based on hydrodynamic cavitation were compared to diesel fuel, and found to be acceptable according to the EN 14214 and ASTM D 6751 standards. The tests have been performed using a single cylinder four stroke diesel engine at different loading condition with the blended fuel at the rated speed of 1500 rpm. SOME (Schleichera Oleosa Oil Methyl Ester) blended with diesel in proportions of 10%, 20%, 30% and 50% by volume and pure diesel was used as fuel. Engine performance (specific fuel consumption and brake thermal efficiency) and exhaust emission (CO, CO2 and NOx) were measured to evaluate the behaviour of the diesel engine running on biodiesel. The results show that the brake thermal efficiency of diesel is higher and brake specific fuel consumption is lower at all loads followed by blends of SOME and diesel. The performance parameter for B10, B20, B30 and B50 were also closer to diesel and the CO emission was found to be lesser than diesel while there was a slight increase in the CO2 and NOx. SOME produced by using hydrodynamic cavitation seems to be efficient, time saving and industrially viable. The experimental results revel that SOME-diesel blends up to 50% (v/v) can be used in a diesel engine without modifications. 相似文献
19.
首先分析了催化裂化过程中影响SO_x排放量的因素和硫转移剂的基本原理,在此基础上探讨了FDFCC-Ⅲ工艺低SO_x排放量的机理。结果表明:FDFCC-Ⅲ工艺具有明显降低烟气中SO_x排放量的作用,其主要原因是FDFCC-Ⅲ工艺催化剂循环量较同等规模的常规FCC工艺提高较多,使再生催化剂可携带更多的SO_4~(2-)进入反应系统,并最终在还原气氛中转化为H_2S。从机理分析可知FDFCC-Ⅲ工艺降低烟气中SO_x排放具有普遍适用性,从而可为炼油厂控制催化裂化烟气SO_x排放提供一定的手段。 相似文献
20.
复合驱油体系内含有各种化学剂,这些化学剂与油层岩石间的相互作用及化学剂在各相中的分配与化学反应,都会影响到复合驱物理化学渗流的机理和规律。在前人研究的基础上系统的阐述了复合驱油过程中的物理化学作用和驱油机理;此外,将复合驱过程中的物理化学影响因素归纳为几个等效因素,可以将复合驱物理化学渗流方程归纳为带吸附作用的对流扩散方程。结果表明:复合体系在亲水和亲油多孔介质中的驱油渗流机理有很大的不同。亲水条件下,复合体系驱油的主要特征是原油被驱油体系夹带运移通过喉道;亲油条件下,复合体系驱油的主要特征是体系进入孔隙与原油形成油包水型乳状液,并可变形通过喉道。给出的渗流方程可用来预测化学剂的传输规律。 相似文献