Results 41 to 50 of about 6,092 (204)
Stress transfer mechanism and engineering practice of hydraulic fracturing roof cutting in roadway [PDF]
Aiming at the problem that the hard roof in the goaf is difficult to collapse, which causes severe mine pressure in the roadway, the transport roadway in the eighth mining area of Jingfang Coal Mine is taken as the engineering background, through ...
Fantai MA +5 more
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Shiyou jixie, 2014 针对国内外对流固耦合条件下起裂压力研究的不足，建立了流固耦合条件下滑套－水泥环－地层三维非线性有限元模型，基于该模型分析了水泥环起裂时水泥环及地层的应力场分布特征。结合最大拉应力准则，提出了固井滑套压裂起裂压力的计算方法，并用现场试验验证了该方法的合理性。基于该模型及方法，研究了端口的主要结构参数对起裂压力的影响规律。首先比较了端口面积相同条件下圆形端口与矩形端口对起裂压力的影响，认为矩形端口有利于降低起裂压力；其次，对矩形端口研究了端口长度、端口个数及端口宽度对起裂压力的影响，研究结果表明 ...
付钢旦 +5 more
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Development status and prospect on key technical equipment of high efficiency fully mechanized mining in super high and super long working face [PDF]
As an important energy support for China”s economic development, coal will remain dominant in energy consumption for a period of time in the future.
Desheng ZHANG +10 more
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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
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Physical simulation study on the transport of biomimetics dandelion proppant in similar coalbed methane fracture network [PDF]
Accelerating the exploration and development of deep coalbed methane resources is a key direction for developing coalbed methane. However, with large-scale volume fracturing in deep coalbed methane development, the complexity of the fractures formed by ...
Jun LI, Nianyin LI, Pingli LIU
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Shiyou jixie, 2015 目前国内的测试装置只能满足105 MPa以下压裂泵的整机测试与试验需要，对于105 MPa以上超高压压裂泵的测试与试验，一方面配套设备很难满足要求，另一方面还有较高的安全风险。为此，研究了一种超高压压裂泵液缸测试装置及试验方法。压裂泵液缸测试装置适应环境温度-20～50 ℃，试验压力最高达207 MPa，可为以后更高压力压裂泵提供检验方法；测试装置装有安全气控阀，确保整个系统压力不超过275 MPa，气源压力0.7 MPa，气源排量不超过1.6 m3/min；气泵输入口增加安全溢流阀，使气压值不超过0 ...
吴苗法, 姜, 涌, 李婧源
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Critical technologies and geology-engineering integration practices for deep CBM production in the Yanchuannan CBM field [PDF]
Objective and Methods This study introduces the adjustments for coalbed methane (CBM) production in the Yanchuannan CBM field‒the first deep CBM field in China.
Bin CUI +6 more
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Shiyou jixie, 2015 针对裂纹对厚壁筒自增强处理效果影响的问题，采用有限元软件分析了2种径比不同裂纹的厚壁筒自增强处理后的残余应力分布规律，并通过节点位移外推法计算了裂纹尖端处的应力强度因子。研究结果表明，不同径比时自增强压力的变化决定了含裂纹厚壁筒在裂纹尖端残余压应力的分布，以及裂纹尖端应力强度因子的变化率；尖端前缘自由表面存在残余压应力区域，促进了裂纹的闭合；随着自增强压力的增大及裂纹长度的减小，扩大了裂纹尖端沿裂纹扩展方向的残余压应力区域范围。
李宁, 廖建敏, 周思柱, 韩冬
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Engineering application and demonstration of intelligent mining control technology for rockburst coal seam [PDF]
How to achieve intelligent, safe and efficient mining of rockburst coal seams is a major engineering and technical challenge facing deep coal mining. The core connotation of this issue lies in the intelligent, unmanned, and inherently safe mining of coal
Baoyan ZHI +8 more
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Shiyou jixie, 2015 页岩气等致密油藏开发过程中常采用分簇射孔和复合桥塞分段大型水力加砂压裂的方式来改造储层，在作业过程中出现了大量的油层套管失效现象，导致正常的完井增产作业无法进行，严重影响了增产效果，降低了完井质量。为此，运用ABAQUS有限元分析软件建立地层-水泥环-套管的三维有限元模型，模拟计算压裂后套管Mises应力及变形分布。通过对有限元结果分析和对比压裂后MIT多臂测井曲线，认为套管失效原因为压裂后局部地层岩石强度非均匀降低，套管受挤压变形，致使套管截面椭圆度和弯曲曲率过大，导致井下工具下入遇阻遇卡 ...
于浩 +5 more
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