共查询到20条相似文献，搜索用时 171 毫秒
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在对外石油技术服务中,OMNI阀与LPR-N阀联合进行地层测试,只需周期性的环空加压、放压即可实现不动管柱多次开关井作业。利用OMNI阀不同的功能状态能反复出现的特点,OMNIN与LPR-N阀联合使用的测试管柱,还可以完成酸化替液、气举诱喷等特殊作业。针对不同的井况及试油方案,合理应用OMNI阀和LPR-N阀能有效解决完井测试中的实际问题。 相似文献
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在煤矿巷道施工中,对于不稳定岩层中掘进,通常采用架设金属棚或发碹支护,但在使用中或实际施工中均存在不足之处,为了克服架棚和砌碹支护所存在的不足,集贤矿二井在现场应用锚网喷联合支护,取得了成功。 相似文献
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在煤矿巷道施工中,对于不稳定岩层中掘进,通常采用架设金属棚或发碹支护,但在使用中或实际施工中均存在不足之处,为了克服架棚和砌碹支护所存在的不足,集贤矿二井在现场应用锚网喷联合支护,取得了成功。 相似文献
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<正>完井液是指从钻开油气层开始到油气井枯竭为止所有作业使用的所有工作液。近年来,保护储层的新型水基完井液主要有甲甙完井液、绒囊完井液,生物完井液,隐形酸完井液,固化水完井液,甲酸盐完井液,无渗透完井液及广谱油膜暂堵完井液等。 相似文献
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特低渗透油藏要求井网密度高、投入大,常规压裂产量下降快,开发效果差。直井长缝压裂完井技术通过压裂造长缝,增大泄油面积,提高特低渗透油藏单井产能,可实现少打井,降低投资。本文介绍了直井长缝压裂工艺优化、压裂液体系优选、综合降滤、射孔优化、控制缝高等技术。该技术在义7-6、滨660和樊142等多个区块进行了应用,现场的实践证明,与常规压裂相比,直井长缝压裂完井技术能够提高单井产能,延长油井有效期,对特低渗透油藏提高压裂开发效果具有重要意义。 相似文献
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文章分析阐述了对该分厂发生炉煤气生产的自动化控制改造方法和经验,通过改造仪表检测设备,更改阀门控制系统、增设鼓风机变频器,增加对煤气生产全流程进行检测和控制的DCS系统,并根据生产工艺以及生产设备的特点,重点开发编制了发生炉自动加煤系统、鼓风机变频控制系统、煤气负荷平衡调节控制系统。经过项目改造后该厂提高了满料层煤气生产的自动化控制程度,稳定了煤气生产,降低了操作工劳动强度。各项技术经济指标有了较大的提升:煤气热值升高,煤气放散率由改造前平均6.4%降低至平均0.09%,年可减少煤气放散量2500Km3;发生炉煤气电单耗改造前年均48.37KWh/Km3降至年均44.61KWh/Km3。 相似文献
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We demonstrate the method of non-inertial lift induced cell sorting (NILICS), a continuous, passive, and label-free cell sorting approach in a simple single layer microfluidic device at low Reynolds number flow conditions. In the experiments, we exploit the non-inertial lift effect to sort circulating MV3-melanoma cells from red blood cell suspensions at different hematocrits as high as 9%. We analyze the separation process and the influence of hematocrit and volume flow rates. We achieve sorting efficiencies for MV3-cells up to EMV3 = 100% at Hct = 9% and demonstrate cell viability by recultivation of the sorted cells. 相似文献
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蔡玉川 《科技成果管理与研究》2010,(2):73-75
本文应用一组产量和流压数据,通过最小二乘法回归得到二项式产能公式中的系数A和B绘制气井流入动态曲线。该曲线能较直观地反映气井产量和井底流压之问的关系,也反映了气体从气藏流入井底的动态,同时也能分析气井的生产制度是否合理。根据气水在井筒中的流动规律,确定气井携液临界流量及临界流速,从而可以确定油管的直径、下入深度等参数,以便对有杆泵排水采气进行优化设计。根据气井的流入动态、气水两相流动、有杆泵的优化设计,用数学手段精确地描述各个系统的参数动态规律,建立各种数学模型,编制计算机程序进行计算。 相似文献
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针对川西地区敏感脆弱的生态坏境,中石化西南油气分公司提出了川西气田油气绿色开采战略目标,致力于油气开采过程中的成套技术研发,着重在压裂返排液重复利用技术、钻井液重复利用技术、地层水利用技术3个方面积极开展工程技术创新,并取得了显著的社会效益和经济效益。基于对西南油气分公司技术创新内外环境的分析,揭示西南油气分公司技术创新的本质,阐明在需求拉动和技术推动的双重作用下企业要同时具备因地制宜、与时俱进的指导思想和创新增效的理念及良好的制度保障,才能真正实现绿色低碳、持续创新的原理。 相似文献
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Flow-focusing microfluidic devices (FFMDs) can produce microbubbles (MBs) with precisely controlled diameters and a narrow size distribution. In this paper, poly-dimethyl-siloxane based, rectangular-nozzle, two-dimensional (2-D) planar, expanding-nozzle FFMDs were characterized using a high speed camera to determine the production rate and diameter of Tween 20 (2% v/v) stabilized MBs. The effect of gas pressure and liquid flow rate on MB production rate and diameter was analyzed in order to develop a relationship between FFMD input parameters and MB production. MB generation was observed to transition through five regimes at a constant gas pressure and increasing liquid flow rate. Each MB generation event (i.e., break-off to break-off) was further separated into two characteristic phases: bubbling and waiting. The duration of the bubbling phase was linearly related to the liquid flow rate, while the duration of the waiting phase was related to both liquid flow rate and gas pressure. The MB production rate was found to be inversely proportional to the sum of the bubbling and waiting times, while the diameter was found to be proportional to the product of the gas pressure and bubbling time. 相似文献
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杜瑞萍 《科技成果管理与研究》2009,(2):90-91,89
气井一点法试井工艺技术简单,施工成本低,施工周期短,已广泛应用于大牛地气田气井产能预测和评价,一点法试井只要求测取稳定的地层压力、一个工作制度下的稳定流压,但一点法对资料的分析带有一定的经验性和统计性,分析误差较大。特别是大牛地气田属于低渗透气藏,压力恢复缓慢,所测的地层静压值偏低,求产开井3天以上多数井测取不到稳定的流压,所取流压值偏高,计算的无阻流量均偏高。因而根据一点法所得到的产能方程来预测地层产能往往偏大,经验统计表明,开井时间越长,所求的无阻流量越低。 相似文献
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本文分析了目前常用管道燃气安全阀的不足和技术上所存在的问题,着重阐述了一种实用新型技术,该实用新型技术提供了一种改进的管道燃气磁控安全阀门,它将阀门的推拉式开关改变为旋转式开关,更提供了一个更强的机械锁紧力,除了能对阀门通断进行人为可靠控制．更能对停气、气压过低、过高、软管断脱过流外泄实行自动控制和可靠关闭,确保用气安全。 相似文献
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Hai-Peng Ren Xuan Wang Jun-Tao Fan Okyay Kaynak 《Journal of The Franklin Institute》2019,356(12):6160-6174
Gas flow has fractional order dynamics; therefore, it is reasonable to assume that the pneumatic systems with a proportional valve to regulate gas flow have fractional order dynamics as well. There is a hypothesis that the fractional order control has better control performance for this inherent fractional order system, although the model used for fractional controller design is integer order. To test this hypothesis, a fractional order sliding mode controller is proposed to control the pneumatic position servo system, which is based on the exponential reaching law. In this method, the fractional order derivative is introduced into the sliding mode surface. The stability of the controller is proven using Lyapunov theorem. Since the pressure sensor is not required, the control system configuration is simple and inexpensive. The experimental results presented indicate the proposed method has better control performance than the fractional order proportional integral derivative (FPID) controller and some conventional integral order control methods. Points to be noticed here are that the fractional order sliding mode control is superior to the integral order sliding mode counterpart, and the FPID is superior to the corresponding integral order PID, both with optimal parameters. Among all the methods compared, the proposed method achieves the highest tracking accuracy. Moreover, the proposed controller has less chattering in the manipulated variable, the energy consumption of the controller is therefore substantially reduced. 相似文献