力学与实践 ›› 2018, Vol. 40 ›› Issue (4): 402-408.DOI: 10.6052/1000-0879-18-058

• 应用研究 • 上一篇    下一篇

定面射孔新工艺对套管强度的影响研究1)

王素玲*,2), 苏义宝*, 孙延安, 宋微*   

  1. * 东北石油大学机械科学与工程学院,黑龙江大庆 163318;
    † 大庆油田采油工程研究院,黑龙江大庆 163318
  • 收稿日期:2018-02-01 出版日期:2018-08-08 发布日期:2018-09-11
  • 通讯作者: 2) E-mail: wsl19751028@163.com
  • 基金资助:
    1) 国家973项目(2015CB250900)和国家自然科学基金项目(51374074)资助

THE INFLUENCE OF THE NEW TECHNOLOGY OF FIXED SURFACE PERFORATION ON CASING STRENGTH1)

WANG Suling2,*, SU Yibao*, SUN Yan'an, SONG Wei*   

  1. * College of Mechanical Science and Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
    † Daqing Oil Recovery Engineering Research Institute, Daqing 163318, Heilongjiang, China
  • Received:2018-02-01 Online:2018-08-08 Published:2018-09-11

摘要: 用于非常规储层的定面射孔工艺可有效地降低水力裂缝的起裂压力,提高近井筒的泄油面积;但该工艺对套管强度的影响研究较少。本文基于流固耦合理论,建立了地层$\!$-$\!$-$\!$水泥环$\!$-$\!$-$\!$射孔套管的应力耦合模型,退化为裸套管与API标准进行比对,效验了模型,并发现地层约束条件下套管承受内压的能力提高了1.48$\sim$2.16倍,在此基础上,给出了套管尺寸、射孔直径及射孔相位角对套管承压能力的变化规律。计算表明:螺旋射孔方位角为45$^\circ$时,定面射孔间夹角为30$^\circ$时,套管内径越小,套管壁厚越厚,则套管的承压能力越高;相同参数下,定面射孔工艺比螺旋射孔工艺引起的套管承压能力略低。

关键词: 定面射孔|螺旋射孔|套管|射孔参数|承压能力

Abstract: The surface perforating process in unconventional reservoirs can effectively reduce the cracking pressure of hydraulic fractures and increase the drainage area near the well-bore. The influence of the technology on the casing strength is an important research issue. Based on the theory of the fluid - solid coupling , a stress-coupling model of the formation-cement-perforation casing is established. With the model being reduced to a bare casing to be compared with the API standards, the effectiveness of the model is tested, and it is found that the constraints of the strata under the casing pressure can withstand an increased internal pressure of 1.48$\sim$2.16 times. On this basis, the relations of the casing size, the perforation diameter and the perforation phase angle with the casing pressure bearing capacity are obtained. The results show that when the diameter of the casing is smaller, the thickness of the casing is thicker. Calculations show that the bearing capacity of the casing is higher when the azimuth angle of the spiral perforation is 45$^\circ$ and the angle between the fixed plane perforations is 30$^\circ$, the pressure bearing capacity of the casing is higher. With the same parameters, the perforating process of the fixed perforation is slightly lower than that of the casing caused by the spiral perforation.

Key words: fixed perforation|spiral perforation|casing|perforating parameter|loading

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