Results 61 to 70 of about 553 (152)
Physical simulation experiment on horizontal docking well leaching for salt cavern storage [PDF]
Objective Horizontal docking well leaching is prevalently applied among salt chemical enterprises for brine extraction. However, controlling the cavern shape becomes challenging when this technique is utilized, primarily due to the absence of dissolution
Jianchao JIA +5 more
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Dianci bileiqi, 2017 针对深井接地板设计过程中通常将实际的水平多层土壤结构视为均匀土壤或简化为两层水平分层结构导致设计值与测量值相差较大的问题,提出了基于数值分析的多层水平分层结构下的深井接地极接地阻值计算模型。并结合桌220 kV变电站运用深井爆破法降阻的案例,通过数值分析的方法获取变电站的土壤分层结构后运用上述模型进行了计算。最后通过仿真验证了深井接地极分层计算模型的准确性,并分析出深井爆破法降阻效果与井深以及下层土壤电阻率的关系。
禹荣勋 +6 more
doaj
, 2017 页岩气储层体积压裂后进行注气开采时提高页岩采收率的重要手段之一,进行页岩气注CO_2开发数值模拟是明确页岩气储层注CO_2开发增产机制,优化注入工艺方案的关键。基于页岩气储层双重介质地质特征,且考虑页岩孔隙度和渗透率的应力敏感性,建立了页岩气注气开采多组分气体扩散和流动控制方程组,并进行数值模拟,分析了不同注气组分和渗透率敏感性对页岩气产量的影响。结果表明:注CO_2比未注CO_2开采的产气量有显著提升,且应力敏感性对产量预测结果影响较大,CO_2注入组分等因素也会对日产量产生影响 ...
时贤, 李东杰, 杨柳, 祝东峰
core
Experimental study and application of hydraulic fracturing in underlying coal seam [PDF]
The coalbed methane resource under goaf is rich, but has not been effectively developed for a long time. Hydraulic fracturing technology stands as an effective means to augment coalbed methane recovery.
Cun ZHANG +7 more
core +1 more source
Shiyou jixie, 2011 内管法免钻塞固井技术存在注水泥排量受限制，达不到紊流所需的顶替排量，固井质量不理想等问题；无内管不钻塞半程注水泥技术虽然解决了原钻塞的工序问题，但由于它采用缩径台阶，给采油作业带来了麻烦，尤其是影响了大直径工具的使用。为此，研制了一种免钻塞分级注水泥完井管柱。它在注水泥管柱中采用带定位机构的堵塞器来代替原完井管柱中的盲板，省去了钻塞工序。免钻塞分级注水泥完井管柱已在胜利油田、车排子油田应用30余口水平井，平均完井周期比原来缩短1 d，施工成功率100%。大通径完井给后续作业施工带来了极大的便利 ...
田启忠 +4 more
doaj
[Relationship between imaging features and intraoperative perilymph gusher in patients with Mondini inner ear malformation]. [PDF]
Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi, 2022 Lu J +6 more
europepmc +1 more source
Research progress and breakthrough directions of the key technical fields for large scale and efficient exploration and development of coalbed methane in Xinjiang [PDF]
The Xinjiang Uygur Autonomous Region has presented the expected resource conditions and work foundations for a large-scale coalbed methane (CBM) exploration and development, which shows that its CBM resources below the depth of 2000 m are 7.5 trillion m3,
Bo WEI +12 more
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Shiyou jixie, 2012 为解决水平井注蒸汽测试中高温高压下动密封和连续管注入头超温问题，成功研制了水平井注蒸汽测试井口防喷密封装置。该装置采用二级密封及长密封段自密封方式，采用耐高温氟橡胶、碳纤维及钢垫的组合形式做密封件，采用耐350 ℃高温导热油自动控制加压密封件，采用水循环冷却管给连续管、密封系统降温，可确保起下时注入头不超温和施工安全。在测试起下过程中，2口水平井井口注汽压力均在13 MPa以上，井口防喷密封装置未发生蒸汽泄漏，注入头处温度低于120 ℃，完全可以满足高温高压下用连续管测试施工要求。
吴国伟 +4 more
doaj
, 2015 王忠民获乔治城大学经济学博士学位,现为美国未来资源研究所(Resource for Future)研究员。 Alan Krupnick 获马里兰大学经济学博士学位,现为美国未来资源研究所高级研究员。本文回顾了美国页岩气开发的经济史、政策史和技术史。本文的主要目的是弄清引发美国“页岩气热潮”的因素,为希望开发本国页岩气资源的国家提供借鉴。本文研究发现：政府政策、私有企业的活动、私有土地权和矿产权以及二十世纪初天然气价格的高涨等因素,对“页岩气热潮 ...
Alan Krupnick, 王忠民
core
Engineering practice of advance gas control for crushed soft coal seams through directional fracturing using a long borehole in the coal seam roof [PDF]
Objective and MethodsThe crushed soft coal seams susceptible to intense coal and gas outbursts exhibit high gas content and pressure. Consequently, during borehole drilling for regional gas pre-drainage in such coal seams, high blowout intensity is prone
Bingyi JIA +3 more
core +1 more source