特种油气藏 ›› 2023, Vol. 30 ›› Issue (2): 161-167.DOI: 10.3969/j.issn.1006-6535.2023.02.023

• 钻采工程 • 上一篇    下一篇

致密油藏压裂井气驱暂堵调剖剂研制与评价

唐可1, 赵勇1, 李凯1, 宁朦1, 蒲万芬2, 田开平2   

  1. 1.中国石油新疆油田分公司,新疆 克拉玛依 834000;
    2.西南石油大学,四川 成都 610500
  • 收稿日期:2021-11-01 修回日期:2022-12-11 出版日期:2023-04-25 发布日期:2023-05-29
  • 通讯作者: 田开平(1994—),男,2017年毕业于西安石油大学石油工程专业,现为西南石油大学油气田开发专业在读博士研究生,主要从事油田化学处理剂和提高采收率研究工作。
  • 作者简介:唐可(1985—),男,工程师,2008年毕业于西南石油大学化学工程专业,2011年毕业于该校应用化学专业,获硕士学位,现从事提高采收率技术研究工作。
  • 基金资助:
    国家自然科学基金“黏度可控的原位增黏体系构建及高效驱油机理研究”(U19B2010)

Preparation and Evaluation of Temporary Plugging and Profile Control Agent for Fractured Wells in Tight Reservoirs

Tang Ke1, Zhao Yong1, Li Kai1, Ning Meng1, Pu Wanfen2, Tian Kaiping2   

  1. 1. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China;
    2. Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2021-11-01 Revised:2022-12-11 Online:2023-04-25 Published:2023-05-29

摘要: 玛湖高温致密油藏开发过程中气窜现象严重,聚合物凝胶封堵大裂缝可有效防止裂缝气窜,但同时也易封堵基质和微裂缝,造成采收率下降。为此,研制了一种耐温型暂堵调剖剂MHZD,并从成胶性能、微观形貌、注入性能、封堵能力等方面进行评价。结果表明:暂堵调剖剂配方为0.6%耐高温型阳离子聚丙烯酰胺+0.3%铬离子交联剂,该封堵体系在90 ℃高温下可以稳定成胶,成胶时间为38 h,凝胶强度为H级,凝胶稳定7~10 d后可自动降解成黏度为5.63 mPa·s的水溶液;注入暂堵剂后,岩心阻力系数小于30.000,最大突破压力梯度大于30.000 MPa/m,封堵率和解堵率均大于90%,暂堵剂可有效封堵大孔隙,动用小孔隙中的剩余油。该研究对于玛湖致密油藏压裂井封窜和提高采收率具有重要的支撑作用。

关键词: 暂堵剂, 气窜, 阻力系数, 突破压力, 致密油藏, 玛湖油田

Abstract: There is serious gas channeling in the development of Mahu high-temperature tight reservoir. Polymer gel can be used to plug large fractures, which effectively prevents gas channeling from fractures, but it also plugs matrix and micro fractures, resulting in decline in oil recovery. Therefore, a temperature-resistant temporary plugging and profile control agent MHZD was developed and evaluated from the aspects of gelling performance, microscopic morphology, injection performance and plugging capacity. The results show that: The temporary plugging and profile control agent is prepared by 0.6% temperature-resistant cationic polyacrylamide and 0.3% chromium ion cross-linking agent. The plugging system can be stably gelled at 90 ℃ within 38 h, with Grade H gel strength, and the gel can be automatically decomposed into an aqueous solution with a viscosity of 5.63 mPa·s after 7-10 d stabilization. After the injection of temporary plugging agent, the core resistance coefficient is less than 30.000, the maximum breakthrough pressure gradient is greater than 30.000 MPa/m, and the plugging rate and unplugging rate are both greater than 90%. The temporary plugging agent can effectively plug the large pores and recover the remaining oil in the small pores. This study plays an underlying role in plugging against gas channeling and enhancing oil recovery of fractured wells in Mahu tight reservoir.

Key words: temporary plugging agent, gas channeling, resistance coefficient, breakthrough pressure, tight reservoir, Mahu Oilfield

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