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射孔作为井筒与储层之间的液流通道,是水力压裂过程中的重要可控性参数。为研究水平井射孔-近井筒破裂机制,采用岩层变形-流体渗流方程描述应力状态变化,应用连续损伤破裂单元表征三维破裂位置与形态演化,并开发有限元求解程序模拟分析了射孔对水平井初始破裂压力、破裂位置及近井筒裂缝复杂性的调控作用。通过与解析模型及射孔压裂物理模型试验结果对比,验证了模型及有限元程序的有效性;水平井破裂压力数值分析结果与现场测试数据吻合较好。研究表明:射孔可调控水平井破裂压力与初始破裂位置,同时对近井筒区域裂缝扩展形态影响显著。通过优化射孔参数可以引导初始破裂向最优破裂面扩展、有效降低破裂压力,减小由于螺旋射孔空间排布引起的水平井近井筒裂缝迂曲与复杂程度,提高致密油气藏压裂改造效果。 相似文献
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结合SET 1X全站仪在雅泸高速公路菩萨岗隧道贯通测量中的实际应用,阐述隧道贯通测量所采用的方法及各项技术措施,从而确保隧道精确贯通. 相似文献
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PBR01井是河南省有色金属地质矿产局在平顶山北组织实施的一口地热勘查示范井。完井深度2248.56 m,终孔直径216 mm。施工过程中遇到涌水、漏失、坍塌掉块、水敏失稳造浆等复杂地层及岩心采取率低等问题。本文从地层情况、井身结构设计、钻井工艺技术等方面介绍了该井的施工情况,总结取得的成果。通过采用改善钻井液性能、工艺堵漏、改进坚硬地层取心工艺、平衡法固井等措施解决施工中遇到的难题,为今后该地区中深部地热钻探积累一定的经验和技术。 相似文献
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Numerical analysis of projectile penetration and perforation of plain and fiber reinforced concrete slabs 下载免费PDF全文
The research presented in this paper deals with the numerical analysis of projectile impact on regular strength concrete (RSC), high‐strength concrete (HSC), and engineered cementitious composites (ECC) using the Lattice Discrete Particle Model (LDPM). The LDPM is chosen in this study as it naturally captures the failure mechanisms at the length scale of coarse aggregate of concrete, and its capabilities include the accurate depiction of both intrinsic and apparent rate effects in concrete, as well as fiber reinforcement effects. The model is used to predict the experimental impact response performed by four independent testing laboratories, and for each data set the model parameters are calibrated and validated using a combination of uniaxial compression, triaxial compression, uniaxial strain compression, and dogbone tests. In the first study, perforation experiments on RSC and HSC for varied impact velocities are carried out, and the exit velocity is compared with the available experimental data. The second study focuses on ECC, where multiple impact of steel and plastic fiber reinforced concrete panels are explored. A third investigation is performed on four RSC panels with varied thicknesses and subjected to the same impact velocity. In this instance, the model is used to predict the penetration depths for the different cases. Finally, in the last study, the response of large‐thickness infinite panels of sizes ranging from 300 mm to 700 mm under projectile impact is considered. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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BZ34-5-A井原属高产井,但后期出现一系列复杂问题导致该井无法生产。为了恢复该井产能,需要对其进行综合治理。通过对该区块前期钻完井资料的分析和该井投产后期出现的问题进行深入分析研究,对综合治理方式进行比选,形成最终作业方案:使用强抑制无固相钻井液侧钻开钻,裸眼段下入打孔管,在打孔管内以电缆射孔的方式完成对该低效井的治理,安全快速地完成了该井的综合治理工作,最大限度地保护了储层,使该井恢复了产能。该治理技术可大幅节约成本,对于附近区块类似低效井的治理提供了很好的技术借鉴。- 相似文献
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