Results 21 to 30 of about 3,481 (150)
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 水平井分段压裂技术是水平井增产改造的重要技术。该技术可在第1层压裂结束后，投球加压，使滑套下移，将下面一层关闭，露出第2层喷砂循环孔，开始第2层压裂，实现不动管柱多层压裂。在介绍水平井分段压裂技术关键工具结构及性能的基础上，以水平5-1井为例，对该技术的应用情况进行了介绍。应用结果表明，封隔器分段压裂技术分段准确、施工方便，对开发低渗透油藏具有良好效果。建议进一步开展压裂工具的优化设计和不动管柱封隔器分段压裂技术研究。
孙骞 +4 more
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Evolution of broken pressure and fracture morphology in indirect fracturing for broken-soft coal [PDF]
Indirect fracturing using a horizontal well in roof is a promising technology for methane exploitation in broken soft and low-permeability coal seams. Stratum-penetration fracturing and a complex fracture network with good conductivity are two keys for ...
Dijie ZHU +5 more
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Shiyou jixie, 2012 针对水平井分段有效压裂难题，研发了水力分段射孔压裂配套工具。该工具主要由万向接头、偏心定位器、喷射器、单流阀等组成。应用水力分段射孔压裂工艺对吴平1井、吴平6井等6口井进行了作业。应用结果表明，美国喷嘴抗磨性能优于硬质合金喷嘴，压裂阶段排量保持在1.8 m3/min左右时，分阶段加大砂质量浓度对喷嘴损伤影响不大，目前喷射器设计壁厚28 mm，安全系数较高，可以满足喷射压裂3段的安全需要。
丁青山 +4 more
doaj
Petroleum Exploration and Development, 2011 Taking the Kenjiyak Oilfield in Kazakhstan as an example, the fracture characteristics and genetic mechanism of carbonate reservoirs with overpressure were discussed.
Dezhi Bian +4 more
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Typical characteristics of deep coal seams with high outburst risk, outburst inducing mechanism and prevention measures [PDF]
Coal mining in China has gradually entered deep levels. With the continuous increase in mining depth, the outburst risk of coal seam has significantly increased, with both the frequency and intensity of outbursts rising noticeably, posing huge challenges
Baiquan LIN, Tong LIU, Wei YANG
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Key problems in in-situ pyrolysis of tar-rich coal drilling for extraction of coal-based oil and gas resources [PDF]
, 2023 Tar-rich coal is a special coal resource with the property of oil and gas resources. Developing the oil and gas resources contained in the tar-rich coal is of great significance for ensuring energy security and realizing the goal of "dual carbon".
Dan HE +6 more
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Shiyou jixie, 2014 针对目前国内外超低渗透油藏水平井压裂改造工艺复杂、工具应用效率低和可靠性差的现状，设计了不动管柱多级水力喷砂分段压裂工具，研发了投球式滑套喷射器与封隔器，将多套喷射器串接，施工时通过投球的方式逐级打开各级喷射器和封隔器，实现射孔及压裂。该工艺管柱具有井下工具少、不泄压投球等特点，能够不动管柱一次性完成水平井3层段分段压裂。现场试验结果表明，该工艺管柱性能可靠，提高了分段压裂改造成功率和施工效率，是一种先进、安全、可靠、高效的水平井分段改造工艺技术 ...
殷桂琴 +5 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
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Research and application of pressure relief technology for fracturing thick hard roof in super-high mining face [PDF]
Aiming at the problems of super-large mining space, strong ore pressure and ultra-high coal wall stability control faced by full-mechanized mining face with ultra-large mining height and thick hard roof, this paper takes the 122104 working face of ...
Futang ZHAO +11 more
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