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ú��ѹ��Һ��ʧϵ�����㷽��̽�� 总被引:5,自引:0,他引:5
压裂液滤失系数是压裂设计中的一个重要参数,在对煤层进行压裂设计时,如果直接利用试井和测井测得的渗透率和孔隙度值代入该滤失系数计算公式,算出的结果将与实际情况大相径庭,这是因为煤层中的渗透率与孔隙度等特性对应力极为敏感(相对砂岩而言),当压裂液注入煤层时,煤层中极度发育的原始天然裂缝(割理,节理等)重新开启,导致渗透率和孔隙度大大增加,而试井和测井只能测得有限范围内的这些原始天然裂缝闭合状态下的地层渗透率和孔隙度,文章通过考虑煤层物性的应力敏感性,对石油上成熟的压裂液滤失系数计算公式进行修正,初步探讨了煤层压裂时计算滤失系数的方法。 相似文献
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ú��������ģ�⼰���ú�����γɵ�ʾ������ 总被引:3,自引:0,他引:3
??The thermal simulation experiment of coal rock can provide a scientific basis for understanding the evolution of hydrocarbon generation in coal??bearing basin and the geochemical characteristics of coalbed methane and its resource prediction. The thermal simulation experiments of gas generation of the upper Paleozoic coal rock samples collected from Qinshui Basin were carried out at the temperatures of 336.8-600 ?棬 the pressure of 50 MPa and the temperature??rising rates of 20 ??/h and 2 ??/h. The results indicated that the gaseous products (relative percent content) were mainly composed of methane?? C2-5 hydrocarbon gases and carbon dioxide?? the bydrogen content and hydrogen sulfide content being extremely low?? along with the increase in simulation temperature?? the methane and hydrogen increased but carbon dioxide decreased?? and the C2-5 hydrocarbon gases and hydrogen sulfide increased first and decreased afterwards?? the low temperature??rising rate was favourable to the generation of methane?? C2-5 hydrocarbon gases?? hydrogen and carbon dioxide?? their formation being stage?? the relative productivity of carbon dioxide or hydrogen was positively correlated with that of methane at the same temperature??rising rate?? which reflects that they and the methane were the products of simultaneous parallel reaction in the process of the pyrolysis of coal rocks?? and the ability of generating methane and C2-5 hydrocarbon gases of Shanxi Formation coal rocks was higher than that of Taiyuan Formation coal rocks at the same simulation temperature and temperature??rising rate?? which means that the Shanxi Formation coal rocks were more beneficial to coalbed methane formation in natural conditions. Finally?? the significance tracing coalbed methane formation is discussed in the paper according to the experimental results. (Financed by the National Basic Research Program Project??No. 2002CB211701) 相似文献
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��Through investigation of gas experiment information and listing still more data,the characteristics of the heavy hydrocarbons contained in the coal bed gas in Permian and Trassic of Sichuan basin under normal atmospheric temperature and 95�� and that contained in the fragments of coal core heated to 95�� are respectively expounded in this article and the factors controlling the change of heavy hydrocarbons are primarily summarised also. 相似文献
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��Based on the model experiment,the characteristics of the isotope composition of carbon and hydrogen in methane and the gas components of the coal-formed gas and Oil-formed gas are discussed,and the indicators distinguishing the coal-formed gas and the Oil-formed gas and their changing rules under different muturity conditions are summarized. 相似文献
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��Based on demonstration of the gas source,the thermal evoluation of organic matters and the conditions of forming gas reservoir etc.,the authors consider that the north part in Erduosi basin is the favourable region for expiorating the coal-formed gas.Source beds are mainly thy coal series in Carboniferous and Permian,reservoirs and cap rocks are mainly the Shihezi formation of Permian.There are many types of trap in this region,but the key point of exploration should be the anticlines.Four favourable areas are respectively evaluated in this paper also. 相似文献
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ú�����⾮���ۼ��� 总被引:1,自引:0,他引:1
由于煤层结构的特殊性,使得煤层气的测井评价方法有别于常规天然气层的评价方法。针对煤层的物性特点及其储气机理,借鉴国内外煤层气测井评价方面的经验,从灰分组分分析,固定碳含量分析,煤质分析,割理程度的评价,割理孔隙度求取等几方面入手,全面详细地论述了煤层含气量和可采储量的测井评价方法。 相似文献
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我国已将煤层气正式列为鼓励开发的新矿种,近几年的勘探和生产实践也昭示了中国煤层气资源的良好开发潜势,许多煤层气田的煤层气勘探已经进入了申报储量阶段。因此,亟待建立诸如规范煤层气资源评价、科学地计算和管理煤层气储量等的管理体系。分析了煤层气作为独立新矿种的特殊性及其对储量管理的客观要求,分析了美国煤层气储量管理的经验,探讨了我国煤层气储量管理的最终目标与现实储量实施之间的距离。结果认为,规范我国煤层气储量管理工作的关键在于健全储量管理体系。提出了建立我国煤层气储量管理规范的技术思路和储量分类分级体系。 相似文献
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苯与丙烯烷基化固定床反应器气液分布的研究 总被引:2,自引:1,他引:1
对苯与丙烯烷基化气液固反应器的分布系统进行了研究。在对工业装置的气液分布系统进行分析后,提出了扩产1 6倍的分布器设计方案;惰性床层液相混合与传质的计算结果表明,液相中丙烯浓度在惰性床层约0 4m处达到平衡,惰性床层中传质速率很快。按照等动量放大法设计的气体分布器,反应器生产能力提高前后的压降不会有大的变化。颗粒大小对摩擦压降变化敏感,而较之摩擦压降,持液静压对总压降的贡献可以忽略。压降的计算结果与工业装置实际值基本一致。 相似文献
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总结了近年来国内固定床苯氧化制顺酐工艺技术的新进展,主要从顺酐催化剂的多段床技术和器外活化技术两个方面进行了介绍,阐述了多段床技术中催化剂的配方、反应器的操作条件等因素对顺酐收率的影响;同时总结了催化剂器外活化条件对催化性能的影响。相对单段床技术,多段床技术的苯负荷和顺酐收率均更高,熔盐温度和热点温度均较低,达到了降本增效的目的。器外活化技术不需企业对催化剂进行活化,降低了企业的生产成本,增加了企业的经济效益。 相似文献
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在煤层气井排采过程中,通常用回声仪来监测环空液面变化,通过控制液面下降速度来实现稳定、连续降压.目前,常用的回声仪基于油气井液面测定而设计,应用于煤层气井排采中.但煤层气排采的特殊性要求其具有浅液面、高精度、抗干扰的测试性能,还要具有安全高效的发声源和直观的液面资料管理系统.针对煤层气生产特点,研制开发的MCJ-1煤层气井液面测试仪较好的满足了这些要求. 相似文献
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煤层井壁稳定技术研究进展与发展趋势 总被引:4,自引:1,他引:3
井壁失稳是制约煤层气规模化开发的主要因素之一。掌握国内外最新研究动态、全面了解井壁失稳的影响因素和研究方法是开展井壁失稳研究的重要基础。从时间和地区上对煤层的井壁稳定进行了分类,归纳了煤层井壁稳定研究中存在的三大难点问题和三种主要研究方法。从煤层的井壁失稳机理、影响因素和研究方法入手,将其细分为煤岩机械力学、微观结构、化学特性、煤层的宏观地质构造、力学环境、煤层的力学分析模型和数值模拟等七个方面,结合各方面综述了国内外的煤层井壁稳定研究成果,预测了煤层井壁稳定技术的发展趋势。 相似文献