Results 71 to 80 of about 565 (152)
Shiyou jixie, 2014 深水钻井导管受力复杂，影响因素较多，主要包括平台偏移、海流流速、土壤强度、固井质量和低压井口出泥高度等，确定各影响因素的优先等级是深水钻井导管钻前设计和现场作业急需解决的问题。建立了深水钻井导管力学分析模型，分析了导管的力学特性，采用正交试验方法安排仿真试验方案，对仿真试验结果进行极差分析和方差分析，从而确定各影响因素对深水钻井导管力学特性的影响大小和显著性。研究结果表明，导管最大应力值出现在泥线以下8 m左右，影响导管最大Mises应力的因素依次为平台偏移、导管外径、导管壁厚、海流 ...
李飞 +4 more
doaj
Identification and on-site application of the main hazard-causing stratum of overlying strata in coal mines [PDF]
In response to the challenging task of accurately identifying the main hazard-causing layer of overlying strata in the coal mine surface hydraulic fracturing construction, this study focuses on the industrial test of ground hydraulic fracturing at the ...
Bing WANG +8 more
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Shiyou jixie, 2012 研究了非均质油藏注水井分层配注水嘴与各小层分注量、分注压力及各小层物性的关系，对各小层调配前、后注水量变化规律与调配水嘴选配问题进行分析，建立了适合非均质油藏分层配注水嘴优选的方法。将配水嘴优选软件在39口井上推广使用，测试层段配注符合率91.3%，比原来提高了10.5%，平均测调周期81.1 d，比原来延长了23.8 d。对胡状油田分注水井的32个层段配水嘴进行优化计算，并与实际测试情况进行对比分析。分析结果表明，实际注水量是稳定后的平均日注水量，最大误差10%，最小误差2%，平均误差3.31%。
蒋国栋 +3 more
doaj
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
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Shiyou jixie, 2014 针对现有的偏心分注工具不能满足薄互层油藏小卡距细分注水、原K344型偏心封隔配水器不适应大斜度注水井分注的问题，研制了P2Y341-115型细分层封隔配水器。该工具将1个压缩式封隔器与2台偏心配水器的功能集成一体，实现多个连续薄夹层注水井的分注，并大幅提高测试调配效率。现场应用7口井，封卡最薄油层4.4 m，最大井斜31.75°，均完成了分层验封、分层流量测试及水嘴投捞，平均配注符合率达到89.8%，平均使用寿命达到1 a以上。
doaj
Commingling production of deep coal-measure gas through hydraulic fracturing: Propagation patterns of induced fractures and their determinants [PDF]
ObjectiveThe commingling production of coal-measure gas represents a pivotal approach to enhancing the single-well production of unconventional gas in China.
Dian LI +7 more
core +1 more source
Shiyou jixie, 2014 压裂水平井已经成为目前开采致密气资源的主要手段。如何评价和分析油气藏压裂后的效果是油气藏工程中一个亟待解决的问题。压裂效果评价需要存储的数据种类越来越多、数据量也越来越大，为此，通过裂缝监测、产能评价、经济评价和区块综合评价等效果评价方法，结合计算机和软件技术，建立了水平井压裂效果评价数据支持系统。系统可以对井的基础数据、地层参数、压裂施工参数等数据进行录入与查询，通过等值线输出线性回归得出影响压裂效果的因素，从而评价致密气水平井的压裂效果。最后，利用大牛地气田某口水平井进行实例分析 ...
杨志浩 +4 more
doaj
Deep coal geomechanical influence mechanism and its control factors of Daji Block in Ordos Basin [PDF]
Influence mechanism of rock mechanical properties and microstructure, the lithological combination of roof/floor, and coal thickness and gangue thickness on their stress of deep coal seam are unclear, which restricts differentiated gas reservoir ...
Feng WANG +9 more
core +1 more source
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
Theoretical and technological concepts of synergistic coal and natural gas extraction [PDF]
There are a large number of overlapping coal and natural gas resources in China, and due to the requirement of resource extraction efficiency, a large number of overlapping coal and natural gas resources need to be extracted synchronously in the same ...
Delin XIN +5 more
core +1 more source