岩性油气藏 ›› 2020, Vol. 32 ›› Issue (5): 170–176.doi: 10.12108/yxyqc.20200518

• 石油工程 • 上一篇    

顺北油田缝内转向压裂暂堵剂评价实验

张雄1, 王晓之2,3, 郭天魁3, 赵海洋1, 李兆敏3, 杨斌4, 曲占庆3   

  1. 1. 中国石化西北油田分公司 石油工程技术研究院, 乌鲁木齐 830011;
    2. 中国石化天然气分公司, 北京 100020;
    3. 中国石油大学 (华东)石油工程学院, 山东 青岛 266580;
    4. 中国石化胜利油田分公司 科技处, 山东 东营 257000
  • 收稿日期:2019-12-05 修回日期:2020-04-16 出版日期:2020-10-01 发布日期:2020-08-08
  • 第一作者:张雄(1986-),男,硕士,工程师,主要从事酸化压裂方面的研究工作。地址:(830011)新疆乌鲁木齐市新市区长春南路466号中国石化西北油田分公司石油工程技术研究院。Email:zhangnoland@163.com。
  • 基金资助:
    国家自然科学基金项目“热储层水力压裂低温诱导热应力致裂机理研究”（编号：51874338）、中国石化重大科技攻关项目“顺北一区采输关键技术研究与应用”（编号：P18022-001）和山东省自然科学基金项目“增强型地热系统（EGS）低温诱导热应力致裂机理研究”（编号：ZR201702180073）联合资助

Experiment on evaluation of temporary plugging agent for in-fracture steering fracturing in Shunbei oilfield

ZHANG Xiong1, WANG Xiaozhi2,3, GUO Tiankui3, ZHAO Haiyang1, LI Zhaomin3, YANG Bin4, QU Zhanqing3   

  1. 1. Research Institute of Petroleum Engineering and Technology, Northwest Oilfield Company, Sinopec, Urumqi 830011, China;
    2. Sinopec Tianranqi Company, Beijing 100020, China;
    3. School of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    4. Department of Technology, Shengli Oilfield Company, Sinopec, Dongying 257000, Shandong, China
  • Received:2019-12-05 Revised:2020-04-16 Online:2020-10-01 Published:2020-08-08

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摘要： 缝内暂堵压裂是开发断溶体油藏的关键技术之一，该工艺可以使新裂缝在已压出裂缝的其他位置起裂，从而大幅度提高井周弱势通道的动用程度，增加裂缝复杂度，达到增产的目的。顺北油田奥陶系油藏埋深大，缝洞特征明显，温度可达到160℃，导致普通可降解型堵剂快速失效，为此优选了一种油溶性树脂粉，开发了一种自降解颗粒。基于桥堵机理明确了粒径配比和有效暂堵厚度要求，对堵剂稳定性及高温下的降解、吸水后的膨胀情况进行了评价；通过改进的驱替装置对堵剂在裂缝中形成的暂堵隔板强度进行了评价；最后反向注入，记录解堵情况。实验结果表明：油溶性树脂粉不溶于水和酸、碱，但任何温度下都可溶于油，厚度为14 cm的油溶性树脂粉暂堵隔板在不同粒径颗粒质量比为1.0：2.0：2.3时，可耐受10 MPa的压力；A型自降解颗粒不溶于酸、碱、盐，且不溶于油，在高温油相或水相中均可自我降解，厚度为16 cm的A型自降解颗粒暂堵隔板在不同粒径自降解颗粒质量比为1.0：1.3时，可耐受10 MPa的压力。该研究成果为顺北油田提供了2种暂堵压裂时使用的暂堵剂。

关键词: 暂堵压裂, 暂堵剂, 颗粒暂堵, 暂堵强度评价, 物理模型试验, 顺北油田

Abstract: Temporary plugging and fracturing in fractures is one of the key technologies for the development of fault-karst reservoirs. This technology can make new fractures break at other places where the fractures have been pressed out,so as to greatly improve the utilization degree of weak channels around the well,increase the fracture complexity,and achieve the purpose of increasing production. The Ordovician reservoir in Shunbei oilfield has a deep buried depth,obvious fracture and hole characteristics,and the temperature can reach 160℃,which leads to the rapid failure of common degradable plugging agent. Therefore,an oil-soluble resin powder was selected and a self degradable particle was developed. Based on the mechanism of bridge plugging,the requirements of particle size ratio and effective temporary plugging thickness were defined,and the stability of plugging agent,degradation at high temperature and expansion after water absorption were evaluated. The strength of temporary plugging diaphragm formed by plugging agent in fractures was evaluated through improved displacement device. Finally, reverse injection was carried out to record the plugging removal. The results show that the oil-soluble resin powder is insoluble in water,acid and alkali,but soluble in oil at any temperature. When the mass ratio of particles with different sizes is 1.0:2.0:2.3,the oil-soluble resin powder temporary plugging partition with a thickness of 14 cm can withstand 10 MPa pressure. A-type self degradable particles are insoluble in acid,alkali,salt and oil, and can self degrade in high-temperature oil or water phase. The A-type self degradable particles temporary plugging diaphragm with a thickness of 16 cm can withstand 10 MPa pressure when the mass ratio of different particles is 1.0:1.3. The research results can provide two kinds of temporary plugging agents for Shunbei oilfield.

Key words: temporary plugging and fracturing, temporary plugging agent, temporary blockage of particles, temporary plugging strength evaluation, physical model test, Shunbei oilfield

中图分类号: 

  • TE355
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