煤层气井动态产能拟合与预测模型

基于现代人工智能理论和数理统计理论，建立了煤层气井动态产能拟合和预测的时间序列BP神经网络模型和月产/累产比值模型，并通过实例分别验证其在煤层气井产能拟合和预测中的有效性。应用实例表明，这两类模型均能很好地拟合煤层气井的生产历史，并能进行准确定量预测，但各有差别。其中神经网络模型对数据点具有极高的拟合程度，且短期预测精度高，但中长期预测精度较差，因此，该模型适合对产气不稳定的气井进行短期产能预测；月产/累产比值模型对月产/累产比值的整体变化趋势具有较高的拟合程度，且中长期预测精度高，但模型的有效性取决于气井产能的稳定性，因此，该模型适用于预测产气稳定的气井产能。     

寺河区块煤与煤层气协调开采方法研究

为了研究煤层气与煤协调开采的评价方法,确定煤层气生产井作业制度以及其开采效益成本边界和煤层气井经济下限产量,指导制定合理的开发措施,提高采气井最佳使用时间区段.基于经济效益最大化建立了煤层气开采经济评价方法,并对寺河区块煤层气开采进行评价分析.研究结果表明:采用考虑资金时间价值的经济评价模型,指导煤层气井田产量和采气井...     

非平衡吸附模型在煤层气数值模拟中的应用

详细论述了煤层气在微孔中吸附、解吸以及由微孔到裂缝扩散的非平衡吸附模型,并将其与裂缝中的气-水两相渗流模型以源汇项的方式联合起来,建立煤层气数值模拟的耦合模型．利用此模型对实际煤层气孔的试验采气动态进行了生产史匹配．结果表明,在煤层气数值模拟中,应用非平衡吸附模型能够充分体现煤层气藏双重介质的性质及煤层气解吸后从微孔向裂缝扩散的时空过程,克服了平衡态模型把煤气层作为单孔隙介质,将微孔中气体浓度只看作是裂缝中压力的函数,而与时间无关的弱点,使数值模型更接近煤层气开发中解吸、扩散、渗流的实际过程,模拟和预测煤层气的开采动态,评价煤层气储量更准确、更可靠．     

沁水潘庄煤层气井全生命周期产气规律与效果

沁水盆地东南部潘庄区块煤层气开发条件得天独厚,已经实现了产业化,部分气井经过近15 a排采产量衰竭,有必要利用气井全生命周期数据评价产气规律和抽采效果。通过对产气量数据统计和实测剩余含气量与原始含气量的对比,分析了潘庄气井全生命周期产气特征,评价了煤层气地面抽采效果。对146口气井产气量统计分析发现,中、高及特高产井占比92%,平均1 a左右实现稳产,稳产期平均持续11 a,年平均采气速度17%,平均最终采收率达214%,与之相比国内大部分煤层气井产量低,而潘庄区块大部分气井稳产期到来早,持续时间长,采气速度快,最终采收率高。高产原因如下:首先,该区煤层气赋存及开采条件优越,煤的热成熟度高,生气量大,赋存了大量游离气资源,地质构造简单和处于地下水滞留区形成了优越的气体保存条件,煤体结构以原生和碎裂结构为主,裂隙发育,为气体产出和运移提供了通道;其次,研究区气井钻完井、压裂、排采措施基本类似,大部分气井单采3号煤层,产量大于3,9,15号煤合层排采,开采方案合理。研究区15年地面煤层气抽采效果明显,抽采5,7,13 a含气量降低率分别为42%,55%和82%,根据原位资源量和累计抽采量估...     

基于DIMINE软件的某锑矿开采沉陷预计

针对矿山开采沉陷问题,提出了在矿山三维模型基础上,运用概率积分法来进行地表开采沉陷预测的方法。该方法已在三维数字矿山软件DIMINE中实现。简述了矿山三维模型构建过程,详细介绍了开采沉陷计算步骤,并将其应用于某锑矿区的开采沉陷预测。应用实践证明,该方法可以作为矿山地质环境监测方面的全新工具。     

煤层气井生产曲线的拟合和产量预测

本文根据煤层气井的储层参数和水文地质数据，通过计算排采在煤层中形成的压力降，再结合兰氏方程、临界解吸压力等参数，进一步计算出煤层气井的产水量和产气量，并与实际的生产曲线相比较，进行拟合校正，建立合理的预测模型，用于煤层气井未来的产水量和产气量的预测。该方法回避了以往数值模拟的解吸、扩散、气水两相流运移的复杂计算。     

低渗欠饱和煤层气井产能分析新方法研究

为准确获取煤层气井物理性能参数,提出了一种简便的基于生产初期排水数据的产能分析新方法,首先,考虑煤层普遍具有的低渗特征,引入调查半径公式,计算各个时刻煤层气井压力波前缘位置,然后,基于连续稳态方法,推导各个时刻考虑应力敏感与压力波扩展的稳态渗流方程;最后,对渗流方程进行线性化处理,得到适用于低渗欠饱和煤层气井的产能分析新方法,该方法的可靠性与应用性通过与数值模拟以及现场实例对比进行研究。研究结果表明:新方法预测的渗透率与实际渗透率间的误差为2.38%,表皮因子的误差为6.59%,满足现场工程应用需求,新方法能够准确获取储层物性参数,为气井后期产能预测,生产制度调整提供有效理论依据。     

郑庄北部Ⅲ类资源区CBM开采特征研究

以郑庄北Ⅲ类资源区的1.5亿m~3先导试验井作为研究对象,通过油藏工程的手段,引入比采气指数、递减率、递减指数等新的参数表征该区煤层气的开发效果,对其产气/水特征、压力变化规律和产量预测方法进行研究。结果显示该区生产井的产气/水和压力变化与实际地质特征存在明显的匹配,同时运用递减规律诊断方程的方法对气井产量降低的初始阶段进行拟合计算可以较为准确的预测后续产气情况。     

矿井规划与煤层气井建设协调发展决策系统

针对不同矿区煤矿生产特点,结合煤层气吸附/解吸特征,得出3种开采方式和掘进工作面上煤矿安全生产的最高允许含气量模型,并编制了相关程序;应用Comet软件对不同井网下垂直井的产气量进行预测,获取安全临界值下的控制面积、生产年限;通过不同井网直接经济效益和间接经济效益的求算,结合矿井、煤层气井建设特点,最后提出矿井和煤层气井的开发规划方案.实例表明：该系统可较好地协调煤层气与煤矿之间的矿权纷争,达到双赢的目的.     

煤粉对煤层气直井产量的影响

根据煤层气藏的特点,利用渗透率平行路径模型和煤层气渗流控制方程推导稳态情形时煤层气直井产量公式。结果表明,对于不同的非堵塞路径占总孔隙路径的百分比,煤粉产出时煤层渗透率和煤层气直井产量有可能增大,也有可能减小。实例计算结果与实际生产资料一致,证明了该方法的可靠性。     

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     

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。     

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     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。