热机碎岩钻头摩擦元件材料研究

为了解决热机碎岩钻头摩擦元件耐高温、耐摩擦等性能不足问题,对摩擦元件材料进行研究,包括胎体材料选择、配方设计等。试验结果表明,用陶瓷代替硬质合金作为热机碎岩钻头的摩擦材料是可行的,利用热压烧结工艺可以将陶瓷固定在钻头上。     

热-机碎岩孕镶金刚石钻头的设计及试验研究

为提高钻进效率,合理利用钻进过程中产生的热量,本文采用摩擦热能辅助机械能碎岩(简称:热-机碎岩)的方法,将氮化硅作为摩擦元件引入孕镶金刚石钻头中,以提高钻头工作层的钻进性能。本文通过对钻头水口、摩擦元件的尺寸计算,钻头胎体、结构的设计,制造了一种新型热-机碎岩孕镶金刚石钻头(简称:热-机碎岩钻头),并与常规六水口钻头和三水口钻头开展了室内钻进试验对比。结果表明,与六水口钻头和三水口钻头相比,热-机碎岩钻头加入摩擦元件后能够因摩擦生热而使岩石产生弱化作用,钻头钻速提高,在相同钻井液流量下最高可比六水口钻头的机械钻速高33.3%。热-机碎岩钻头胎体的磨损程度比三水口钻头小,热-机碎岩钻头可用于强研磨性地层的钻进。     

热-机碎岩孕镶金刚石钻头的设计及试验研究

为提高钻进效率,合理利用钻进过程中产生的热量,本文采用摩擦热能辅助机械能碎岩(简称:热-机碎岩)的方法,将氮化硅作为摩擦元件引入孕镶金刚石钻头中,以提高钻头工作层的钻进性能。本文通过对钻头水口、摩擦元件的尺寸计算,钻头胎体、结构的设计,制造了一种新型热-机碎岩孕镶金刚石钻头(简称:热-机碎岩钻头),并与常规六水口钻头和三水口钻头开展了室内钻进试验对比。结果表明,与六水口钻头和三水口钻头相比,热-机碎岩钻头加入摩擦元件后能够因摩擦生热而使岩石产生弱化作用,钻头钻速提高,在相同钻井液流量下最高可比六水口钻头的机械钻速高33.3%。热-机碎岩钻头胎体的磨损程度比三水口钻头小,热-机碎岩钻头可用于强研磨性地层的钻进。     

摩擦热-机械碎岩技术的研究应用现状及新进展

摩擦热-机械碎岩是传统的热力碎岩工艺与机械碎岩工艺的有机结合.介绍了热机碎岩技术的国内外研究发展现状以及碎岩机理、测温、钻具结构、钻头+结构、钻进工艺等方面的最新研究成果.     

超声波辅助PDC切削齿振动破岩仿真分析

PDC钻头在软至中硬地层钻进时具有钻速高、使用寿命长、设计灵活等显著优点,在钻井领域中的需求量逐年增加。而超声波钻进作为一种新型碎岩技术,由于在钻进过程中具有穿透能力强、钻进效率高等优点而获得了广泛关注。以超声波振动辅助PDC钻头破岩有望取得良好的钻进效果。为此,基于线型Drucker-Prager模型,利用ABAQUS软件建立了超声波辅助PDC钻进振动切削岩石的二维有限元模型,分析了不同超声波振动频率下PDC钻进破岩比功和切削力的变化规律,比较了超声波振动切削与常规切削岩屑形成过程的差异。研究结果表明,当激励频率从20 kHz至40 kHz增长的过程中,破岩比功与平均切削力都呈现先减少后增加的变化趋势,即存在一个最优频率位于25~30 kHz间,使破岩比功最小,钻进效率最高;超声波辅助振动切削的破岩方式与常规切削的塑性破坏不同,主要以脆性破坏为主,其切屑形成过程共分为4个阶段,且切削力保持为零的阶段较常规切削更为明显;当激励频率接近岩石固有频率时,超声波振动切削的平均切削力较常规切削小20.5%,并更易产生大块岩屑,使岩石产生更多体积破碎,从而提高破岩效率。     

表镶式金刚石钻头轴心压力与寿命关系的探讨

表镶式金刚石钻头钻进中硬岩层是借钻具的轴心压力，以其胎体唇面镶焊的金刚石之棱角切进岩石一定深度，并随钻具的迴转连续对岩石进行切削和剪切的作用来破碎岩石的。所以，钻头的质量，金刚石的品级，钻进工艺规程等，都直接影响钻头的使用寿命。在钻进工艺规程中，正确选择轴心压力对延长钻头的使用寿命，提高钻进效率，减少金刚石的磨损都是极为重要的。因此，必须分析轴心压力与寿命的关系。     

非常规碎岩技术的研究进展

论述了非常规碎岩方法——热熔岩法、热机碎岩法和脉冲放电碎岩法的碎岩机理、碎岩工具以及工艺等技术的国内外研究取得的成果。国内的热熔岩技术研究在热熔器结构上取得突破,处于国际先进水平。热机钻进产生的温度能达到岩石的最佳热破碎温度,说明工艺是可行的。脉冲放电碎岩法在小直径钻孔中的试验,表明了其比常规碎岩法具有非常低的能量消耗。     

岩石压入硬度试验的简易方法

一、迴转钻进时岩石硬度概念迴转钻进时确定岩石可钻性的最主要因素一般认为是岩石的硬度和研磨性。其理论与实践依据是：第一、现用迴转钻进碎岩工具以硬质合金、金刚石作为钻头齿刃，钻进过程依赖压入—剪切、压裂—压碎的作用；细粒孕镶金刚石钻头以磨削破碎岩石。如果把磨粒放大，也和前者的破碎岩石作用相仿。十分明显，一般较坚硬的岩石总是比较软的岩石难以钻进，也就是钻进速度较低。     

新产品简介

利用新式柱齿,提高凿岩效能瑞典桑德威克公司推出一种用DP(双重特性)系列柱齿制作的钻头。据称,利用这种柱齿制作的钻头具有以下特点:比普通硬岩钻头的使用寿命高达40%;能有效地钻凿坚硬磨蚀性岩、角砾岩和各种混合的覆盖岩;可减少各种可能的钻头损坏现象;由于在钻进过程中提取钻具修复或更换钻头的次数少,经济效益大,因此,满足目标具有较大的保障。DP55是专为制造锥形柱齿研制的坚韧耐磨的胶结硬质合金。这种柱齿可用于制造供软岩和非磨蚀性岩石高速钻进用的钻头。多次试验证明,比球形柱齿钻头的钻进速度高20～25%。DP65是抗磨损性能高的硬质合金,它可用于制造供巷道掘进、台阶凿岩和     

液动冲击回转钻进技术问答(续三)

二十三、液动冲击回转钴进是怎样破碎岩石的？答：冲击回转钻进时，钻头上的硬质合金切削具同时作用着两个力：一个是回转方向的回转力；另一个是轴向的冲击力。因此，它具有回转钻进破碎岩石和冲击钻进破碎岩石的两种特性。目前在分析冲击回转钻进岩石破碎机理问题上，存在着两种不同的观点：一种观点认为，岩石的破碎主要是由冲击载荷引起的，钻具的回转只是移动切削具的位置，以便将破碎了的岩石切剪掉；另一种观点则认为，岩石的破碎仍然是以回转作用为主的，冲击     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2014 second batch of rare earth quota released

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2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586