...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Natural Gas Industry B >A new post-frac evaluation method for shale gas wells based on fracturing curves
【24h】

A new post-frac evaluation method for shale gas wells based on fracturing curves

机译：基于压裂曲线的页岩气井压裂后评价新方法

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Post-fracturing evaluation by using limited data is of great significance to continuous improvement of the fracturing programs. In this paper, a fracturing curve was divided into two stages (i.e., prepad fluid injection and main fracturing) so as to further understand the parameters of reservoirs and artificial fractures. The brittleness and plasticity of formations were qualitatively identified by use of the statistics of formation fracture frequency, and average pressure dropping range and rate during the prepad fluid injection. The composite brittleness index was quantitatively calculated by using the energy zones in the process of fracturing. It is shown from the large-scale true triaxial physical simulation results that the complexity of fractures is reflected by the pressure fluctuation frequency and amplitude in the main fracturing curve, and combined with the brittleness and plasticity of formations, the fracture morphology far away from the well can be diagnosed. Well P, a shale gas well in SE Chongqing, was taken as an example for post-fracturing evaluation. It is shown that the shale beds are of stronger heterogeneity along the extension directions of horizontal wells, and with GR 260 API as the dividing line between brittleness and plasticity in this area, complex fracture systems tend to form in brittleness-prone formations. In Well P, half of the fractures are single fractures, so it is necessary to carry out fine subsection and turnaround fracturing so as to improve development effects. This paper provides a theoretical basis for improving the fracturing well design and increasing the effective stimulated volume in this area.
机译：利用有限的数据进行压裂后评价对压裂程序的持续改进具有重要意义。本文将压裂曲线分为两个阶段（即垫前注水和主压裂），以进一步了解储层和人工裂缝的参数。利用地层破裂频率，注浆前注水期间的平均压降范围和速率的统计数据，定性地确定了地层的脆性和可塑性。利用压裂过程中的能量区定量计算了复合材料的脆性指数。从大规模真实的三轴物理模拟结果可以看出，裂缝的复杂性是由主压裂曲线中的压力波动频率和幅度反映出来的，再加上地层的脆性和可塑性，裂缝的形态远离好可以诊断。以重庆东南部页岩气井P井为例，进行压裂后评价。结果表明，页岩床沿水平井延伸方向的非均质性较强，以GR 260 API作为该地区脆性与塑性之间的分界线，易发生脆性的地层往往形成复杂的裂缝系统。在P井中，一半的裂缝是单条裂缝，因此有必要进行精细的分段和周转压裂，以提高开发效果。本文为改善该地区压裂井设计和增加有效增产提供了理论依据。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号