Production capacity prediction of U-shaped horizontal wells for in-situ pyrolysis of tar-rich coal: Experimental and numerical simulation study [PDF]
Under the goal of “dual carbon”, “taking hydrogen and retaining carbon” has become an inevitable choice for the clean utilization of coal, and underground coal pyrolysis provides a new idea for increasing domestic tar and gas production.
Bo REN +10 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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Theoretical and technological system for Highly efficient development of deep coalbed methane in the Eastern edge of Erdos Basin [PDF]
Aiming at the development problems of deep coal reservoirs, such as deep burial, low permeability and complex stress field, this paper clarifies that the resource enrichment conditions, effective fracturing volume, effective horizontal section length ...
Borui XU +12 more
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Sedimentary patterns and exploitation practices of tight-sand gas reservoirs in coal measure strata: A case study of the 3rd submember of the second member of the Permian Shanxi Formation in the Daning-Jixian block [PDF]
BackgroundThe third submember of the second member of the Permian Shanxi Formation (also referred to as the Shan 23 submember) in the Daning-Jixian block along the eastern margin of the Ordos Basin is identified as a primary target layer for tight-sand ...
Feng WANG +9 more
core +1 more source
Shiyou jixie, 2012 为满足海上油田水平井及大斜度定向井防砂完井需求，研制了水平井防砂完井物模试验装置。该装置是根据海上油田的钻完井井筒尺寸、射孔方式以及主要完井类型等进行设计的，主要由模拟井筒、加砂混砂、泵注、沉砂过滤、数据及视频采集分析、远程控制及升降支架辅助等系统组成，可针对海上不同的油藏类型和特点，优选出水平井（定向井）防砂完井方式。采用该试验装置开展了水平井砾石充填过程中排量、砂比、携砂能力和漏失量等参数优化的试验研究。试验结果表明，该装置可以提高海上水平井防砂完井成功率，延长防砂完井有效期 ...
高斌 +5 more
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Method and key technologies of underground and surface combined stepwise progressive anti-outburst for deep coal seam groups [PDF]
Modern high-yield and high-efficiency mines still face the situation of tight replacement among roadway driving, mining and extraction, and put forward higher requirements for the regional scope and advanced time of outburst prevention and control ...
Junjian XU, Siqian LI, Yongjiang ZHANG
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Shiyou jixie, 2014 针对吉林油田大安北致密油水平井采用裸眼滑套可开关封隔器多段分压工艺开采，对压后段间矛盾突出，呈现产量低、含水高的情况进行了出水治理技术研究。采用普通油管或连续管带动开关工具，可以将任意层的滑套打开或关闭进行逐层试采，也可以将高含水层段关闭，达到堵水消除段间干扰目的。2口井的现场施工结果表明，施工成功率100%，有效率100%，其中施工后的红平X1井由原来平均日产油0.5 m3增至5.0 m3，红平X2井由原来平均日产油1.8 m3增至8.5 m3。研究结果可为该类水平井的出水治理提供参考。
林其勇, 谢敏
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Inter-cluster and intra-cluster flow distribution and proppant allocation in deep coalbed methane orientation fracturing [PDF]
China has abundant deep coalbed methane (CBM) resources with significant potential for development and utilization, which is expected to become an important supplement to national natural gas supply.
Mengmeng ZHOU +5 more
core +1 more source
Shiyou jixie, 2015 针对国内传统开关阀不适用于水平井控水稳油的分层开采，设计了水平井压差平衡式开关阀。水平井压差平衡式开关阀在设计上充分考虑了高压密封性、防震抗冲击性及防砂堵技术性能。尤其是采用了独特的自适应动态压力平衡系统及电子开关体精密检测限位等高新技术设计，确保了仪器井下工作的长期稳定性和可靠性。现场试验结果表明，该开关阀克服了现有的开关阀在调整开关时泵车压力精度不易控制，多级使用时造成开关误动作的不足，提高了水平井找水的效率和准确性。
陈江烨, 王一良, 侯庆春
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Shiyou jixie, 2015 大牛地气田部分水平井存在井底出砂现象限制了气井产能，采用常规冲砂工艺时井筒内流体易漏失到地层，造成地层伤害，为此开展了速度管泡沫冲砂工艺技术研究。综合考虑压力、温度、黏度和流体密度的影响，由力平衡原理建立了水平井泡沫临界携砂流速计算模型，经计算得知水平段临界携砂流速是垂直段1.5倍，倾斜段介于两者之间。基于气井泡沫携砂模型，以鄂尔多斯盆地伊陕斜坡东北部的1口水平井DPS-9井为施工试验井，设计了该井施工参数，即井口回压在5.0 MPa内，泡沫液与氮气注入比不超过3∶1，冲砂管柱外径优选为38.1 mm ...
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