天然气地球科学

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水平井平面射孔实验研究

翁定为,付海峰,包力庆,胥云, 梁天成,张金   

  1. 1.中国石油勘探开发研究院压裂酸化中心,河北 廊坊 065007;
    2.国家能源致密油气研发中心增产改造部,河北 廊坊 065007;
    3.中国石油天然气集团有限公司政策研究室,北京 100007;
    4.长城钻探录井公司,北京 100010
  • 收稿日期:2017-10-08 修回日期:2018-02-05 出版日期:2018-04-10 发布日期:2018-04-10
  • 作者简介:翁定为(1981-),男,湖北枝江人,高级工程师,博士,主要从事压裂工艺研究.E-mail:wendw69@petrochina.com.cn.
  • 基金资助:

    国家科技重大专项“低渗—超低渗油藏提高储量动用关键工艺技术研究”(编号:2017ZX05013-005);中国石油天然气股份有限公司科技项目“老区直井定向井体积改造技术研究与现场试验”联合资助.

Polyaxial test research on in-plane perforation for horizontal wells

Weng Ding-wei,Fu Hai-feng,Bao Li-qing,Xu Yun,Liang Tian-cheng,Zhang Jin   

  1. 1.Fracturing and Acidizing Center,RIPED,Langfang 065007,China;
    2.Stimulation Department of National Energy Tight Oil and Gas R & D Center,Langfang 065007,China;
    3.China National Petroleum Corporation,Policy Research Office,Beijing 100007,China;
    4.International Mudlogging Department of GWDC,Beijing 100010,China
  • Received:2017-10-08 Revised:2018-02-05 Online:2018-04-10 Published:2018-04-10

摘要:

射孔方式对水平井压裂裂缝起裂和延伸有重要影响。提出了一种旨在降低水平井破裂压力和提高水力裂缝完善程度的平面射孔方法,并采用大型物理模拟实验系统开展了对比实验,对比分析了实验与多种经典理论模型的破裂压力,解剖了水力裂缝形态。实验结果表明:提出的平面射孔,即射孔孔眼和孔道位于同一平面,且该平面垂直于地层最小主应力方向,可大幅度降低水平井压裂破裂压力,同时可降低近井筒的裂缝复杂程度,从而使得裂缝扩展更为充分,提高裂缝的完善程度。结论对于实际的射孔参数优化设计和水力压裂施工具有重要指导意义。

关键词: 破裂压力, 裂缝形态, 水平井, 大型物理模拟实验, 平面射孔, 射孔穿透深度

Abstract:

Perforation is important to fracture initiation and propagation in horizontal wells.This study puts forward an in-plane perforation methodology to decrease the breakdown pressure and improve the fracture-wellbore connection,and large-scale polyaxial tests are deployed to confirm the idea.The breakdown pressure of the tests is compared to those of four models,and also the fracture geometry is observed and analysed.The tests show that the in-plane perforation which means perforation holes and tunnels in the same plane and perpendicular to the minimum horizontal stress reduces the breakdown pressure effectively,and also reduces the near wellbore tortuosity and improves the fracture-wellbore connection.These observation and findings could be used to optimize the perforation and fracturing jobs on site.

Key words: Breakdown pressure, Fracture geometry, Horizontal well, Large-scale polyaxial test, In-plane perforation, Perforation penetration depth

中图分类号: 

  • TE357.1

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