MS-215型大直径绳索取心器及其在煤层气井中的应用     

唐胜利  刘凤琴 《煤田地质与勘探》2002,30(5):61-63

根据煤层气井快速、安全的取心要求,结合现场条件,研制了MS-215大直径绳索取心器。文中介绍了取心器的设计思路、结构特点及现场应用效果。结果表明,该取心器设计合理,机构动作可靠,岩煤心直径大、采取率高、提出速度快,尤其适合煤层气井煤心的采取。   相似文献   

岩土压力传感器匹配误差的特性     

曾辉  余尚江 《岩土力学》2004,25(12):2003-2006

在介绍了岩土压力传感器匹配误差概念的基础上,论述了匹配误差的稳定性、等效性、真实性和实用性以及各特性之间的相关性。通过研究得出：匹配误差特性的核心是稳定性;传感器刚性饼状设计是保证稳定性的必要条件;等效匹配误差不一定是真实的,但即使是不真实,也不影响实用性。  相似文献   

低密度钻井液DMZ的开发与应用     

范万庆  周国庆  高峰 《煤田地质与勘探》1999,(Z1)

钻井液是钻探施工的血液,低密度无固相钻井液ＤＭＺ,能有效解决小口径绳索取心钻探中出现的钻杆内结泥皮、岩粉携带能力差、失水量高等问题。  相似文献   

地质灾害的监测及监测系统   总被引：6，自引：0，他引：6  

廖椿庭 《地质力学学报》1999,5(3):76-83

概要介绍地质灾害的监测与监测系统的总体构思。即:地质灾害监测系统应具有数字化、自动化和网络功能;将灾害发生前的特征信息通过传感器转化为数字化信息、数字化传输、数据库存储并提供使用。文中还介绍了位移传感器的实验研究和在长江三峡链子崖危岩体监测中的应用情况。   相似文献   

复杂地层钻进绳索取芯适岩钻头的研究与试验   总被引：1，自引：0，他引：1  

张克桃 《煤田地质与勘探》1993,21(3):60-63

研究了南方煤矿区复杂地层钻进中钻头的磨损机理,研制出了适合于复杂地层钻进的绳索取芯钻头。探讨了电镀钻头内、外径的保径方法。试验钻头在复杂煤矿区不同类型的地层中均取得了显著的钻进效果。   相似文献   

A SYSTEM OF CAPACITIVE HIGH-VOLTAGE PULSE RECHARGE/DISCHARGE AND ITS IMPLICATION ON EXPERIMENTALLY TRIGGERED EARTHQUAKE          下载免费PDF全文

ZHANG Zhi-he  GUO Yan-shuang  CHEN Shun-yun 《地震地质》2018,40(6):1417-1426

An external small disturbance may trigger seismic events when the fault is in a critical state. The problems related with earthquakes triggered by the dynamic stress such as blasting loads, impact loads, volcanic eruptions and strong earthquakes, have usually drawn wide concerns in earthquake science, and the corresponding research contents are quite extensive, including earthquake triggering mechanisms, triggering earthquake uncertainty, aftershock triggering, and so on. Among them, experimental research is an important way to understand the stress triggering conditions and physical mechanisms, such as the influence of load disturbance on fault friction traits, the influence of periodic disturbance of tidal stress on fault instability, etc., all of which can be gained through experimental investigations. Among them, "how to trigger" is a basic scientific problem to increase the understanding of earthquake prediction theory, thus receiving more attention. There are also some studies that focus on "what happened after the trigger", that is, the sliding instability generated by the triggering method, and then the evolution characteristics of the sliding instability process. The well-known experimental study of the super-shear rupture process is conducted by using the electric explosion method to trigger the fault instability, and the high-speed camera records the super-shear rupture during the fault instability. This means that when the trigger source is controllable, it is possible to generate different types of instability processes, and then to explore which earthquakes will be triggered at different time and space positions under different stress states by means of active triggering. The study of stability analysis and instability process has important scientific significance.A stable system of capacitive high-voltage pulse discharge and recharge is one of basic techniques for studying the triggered earthquakes in laboratory. Based on the wire electric explosion method, this paper develops a controllable trigger experiment system. By designing a new capacitive high-voltage pulse charge and discharge system, while considering the actual needs of monitoring and system timing, multiple functions are integrated into one system. Functionally, in addition to realizing the dynamic loading and unloading function of the wire electric explosion method, the discharge process can be monitored, and the triggering, synchronization and timing signal output is performed with other observation systems, thus realizing the whole process monitoring of the dynamic disturbance action. After testing, the following functions are achieved:1)The voltage and current of the high-voltage charging power supply system can be automatically adjusted, and the system can be shut off after charging; 2)Control modes include manual and remote controls. These two modes can control the recharge, release and pulse discharge of the high voltage capacitor; 3)The system can produce multi-channel synchronous output, which satisfy multiple systems working together. In particular, the remote sensing method greatly improves the experimental maneuverability and security; 4)The system has multiple sets of gas discharge tube to trigger discharge, with a wide range of discharge voltage of 500~5 000V; 5)Roche coil resistance integral current detection can meet the transient resistance, large current detection. Test results indicate that this system has good repeatability and stability with the same discharge energy and discharge energy regulator, which is conducive to carry out single channel trigger of high-pressure discharge experiment. In short, the new charging and discharging system can meet the requirements of experimental study of triggering earthquake. In addition, this system can be used to generate the stress disturbance under certain static and dynamic conditions, and then judge whether this kind of mechanical conditions in active fault systems is currently stable.In short, a controllable single-shot discharge system is developed by a capacitive high-voltage pulse discharge system, which provides a good technical basis for experimental research on triggering earthquakes. In addition, the new system also has application significance:1)multiple triggering output can simultaneously start multiple systems and improve the efficiency of observation. Fault instability is a characteristic of transient response, so, its observation requires high-speed acquisition equipment, which is difficult to control on observation; the trigger system is controllable, with active synchronization observation using physical parameters; 2)stress disturbance can be triggered under static and dynamic loads to detect the safety and stability of the fault system with active trigger.  相似文献   

Measuring drop size distribution and kinetic energy of rainfall using a force transducer     

A. W. Jayawardena  R. B. Rezaur 《水文研究》2000,14(1):37-49

The relatively high cost of commercially available raindrop spectrometers and disdrometers has inhibited detailed and intensive research on drop size distribution, kinetic energy and momentum of rainfall which are important for understanding and modelling soil erosion caused by raindrop detachment. In this study, an approach to find the drop size distribution, momentum and kinetic energy of rainfall using a relatively inexpensive device that uses a piezoelectric force transducer for sensing raindrop impact response is introduced. The instrument continuously and automatically records, on a time‐scale, the amplitude of electrical pulses produced by the impact of raindrops on the surface of the transducer. The size distribution of the raindrops and their respective kinetic energy are calculated by analysing the number and amplitude of pulses recorded, and from the measured volume of total rainfall using a calibration curve. Simultaneous measurements of the instrument, a rain gauge and a dye‐stain method were used to assess the performance of the instrument. Test results from natural and simulated rainfalls are presented. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

水源钻机在超深土层绳索取心钻进中的应用          下载免费PDF全文

杨联锋  段云星 《探矿工程》2020,47(11):44-50

山西省清徐县区域地质调查项目设计800、2000、3000 m科学钻探孔,以调查填补新生界底板埋深控制空白区,各孔钻入基岩30 m完钻。要求全孔取心,岩心采取率≮85%,岩心直径≮60 mm,采用塑料保护管采取原状岩样。针对超深软土层、各组地层特性及厚度未知、钻遇基岩完钻深度未知、大直径高保真全孔取心、项目价格远低于目前市场成本等难题,经过“水源钻机+大提钻取心+长裸眼孔段”实施800 m孔、“岩心钻机+绳索取心+套管固井”实施640 m参数对比孔,创新性使用“水源钻机+绳索取心+长裸眼孔段”工艺完成了2000 m孔的施工。该工艺岩心采取率达到93%,孔径和孔斜符合地质要求,为3000 m孔顺利施工打下了坚实的基础,为同类型项目提供了经验和借鉴。  相似文献   

利用全站仪直线放样功能测量定线的精度分析   总被引：2，自引：0，他引：2  

何英伟  刘飞  曹军奇  徐思睿 《北京测绘》2010,(4):35-38

针对测量定线过程中出现的问题,介绍了全站仪直线放样功能用于测量定线的基本原理,并对测线上的转点和整条测线进行了精度分析。为了提高测线精度,提出了依据实地观测条件,分别在各测线段引入转点分段测量的方法。  相似文献   

金刚石工具在钢筋混凝土结构修复改造中的应用与研究现状          下载免费PDF全文

段隆臣  谭松成 《探矿工程》2016,43(6):34-38

我国正处于钢筋混凝土结构应用与发展的大规模新建与修复改造并重阶段。为对钢混结构进行局部或整体的拆除与修复改造,传统机械破碎与爆破拆除方式存在施工效率低、安全隐患大和环境污染严重等问题,而利用金刚石工具对其进行静力切割拆除的施工方法在近年来得到迅速发展。目前,在钢混结构拆除与修复改造施工中应用最多的金刚石工具为金刚石薄壁钻头、金刚石锯片和金刚石绳锯。本文对上述3类金刚石工具在钢混结构修复改造施工中的应用现状、钻进与锯切机理、制造技术和施工工艺等研究现状进行了总结与分析,在此基础上指出了其可能的研究趋势与发展方向。研究成果可为金刚石工具在工民建和部分特殊领域的广泛应用提供技术参考。  相似文献