石油学报 ›› 2018, Vol. 39 ›› Issue (4): 427-434.DOI: 10.7623/syxb201804006

• 油田开发 • 上一篇    下一篇

弹性冻胶分散体与孔喉匹配规律及深部调控机理

戴彩丽1, 邹辰炜1, 刘逸飞1, 由庆1, 佟颖2, 吴川3, 单朝晖4   

  1. 1. 重质油国家重点实验室 中国石油大学石油工程学院 山东青岛 266580;
    2. 中国石油化工股份有限公司石油工程技术研究院 北京 100101;
    3. 中国石油化工股份有限公司石油勘探开发研究院 北京 100083;
    4. 中国石油新疆油田公司风城油田作业区 新疆克拉玛依 834000
  • 收稿日期:2017-10-12 修回日期:2018-01-23 出版日期:2018-04-25 发布日期:2018-05-03
  • 通讯作者: 戴彩丽,女,1971年3月生,1993年获石油大学(华东)学士学位,2006年获中国石油大学(华东)博士学位,现为中国石油大学(华东)石油工程学院教授、博士生导师,主要从事提高采收率与油田化学的研究与应用工作。Email:daicl306@163.com
  • 作者简介:戴彩丽,女,1971年3月生,1993年获石油大学(华东)学士学位,2006年获中国石油大学(华东)博士学位,现为中国石油大学(华东)石油工程学院教授、博士生导师,主要从事提高采收率与油田化学的研究与应用工作。Email:daicl306@163.com
  • 基金资助:

    国家重点基础研究发展计划(973)项目(2015CB250904)、国家杰出青年科学基金项目(No.51425406)、教育部长江学者奖励计划项目(T2014152)和山东省泰山学者攀登计划项目(tspd20161004)资助。

Matching principle and in-depth profile control mechanism between elastic dispersed particle gel and pore throat

Dai Caili1, Zou Chenwei1, Liu Yifei1, You Qing1, Tong Ying2, Wu Chuan3, Shan Chaohui4   

  1. 1. State Key Laboratory of Heavy Oil;School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
    2. Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China;
    3. Sinopec Petroleum Exploration & Production Research Institute, Beijing 100083, China;
    4. Fengcheng Oilfield Operation Area, PetroChina Xinjiang Oilfield Company, Xinjiang Karamay 834000, China
  • Received:2017-10-12 Revised:2018-01-23 Online:2018-04-25 Published:2018-05-03

摘要:

弹性颗粒型调驱剂与油藏孔喉匹配规律研究的缺乏是造成现场弹性颗粒调驱施工盲目性大、措施成功率低的主要原因。针对这一技术问题,通过室内物理模拟实验,以弹性冻胶分散体在岩心中的注入性及调控能力为指标,研究了不同匹配系数条件下弹性冻胶分散体(DPG)颗粒与油藏孔喉的匹配规律,并提出了冻胶分散体颗粒在岩心孔喉中的匹配及深部调控机理,为其在油田的实际应用奠定了基础。实验研究表明:冻胶分散体颗粒呈较规则的圆球状且粒径分布均匀集中;当匹配系数优选为0.20~0.31时,冻胶分散体颗粒在岩心中兼具良好的注入性能和调控能力;通过多点测压和扫描电镜实验观察到,在优选的匹配系数范围内,冻胶分散体颗粒在岩心的前端、中端、末端均有堆积,且长岩心各区间封堵率均可达到80%以上,证明了冻胶分散体颗粒能够在多孔介质中实现深部运移,并且在多孔介质深部实现有效调控;根据压差梯度分析得到匹配规律及深部调控机理:当匹配系数较大时,冻胶分散体颗粒在近井地带快速堆积,造成注入压差急剧升高,甚至堵塞、污染地层;当匹配系数较小时,冻胶分散体颗粒不能在大孔喉或优势通道中实现有效堆积,无法对大孔喉或优势通道实现有效调控;当匹配系数在优选范围内时,冻胶分散体兼具良好的深部运移能力及深部调控能力,可以实现地层深部液流转向,大幅度提高波及系数。

关键词: 冻胶分散体, 封堵率, 匹配关系, 深部调驱, 提高采收率

Abstract:

The lack of studies on matching principle between elastic-particle profile control agent and reservoir pore-throat is a main reason for a serious blindness during field elastic-particle profile control and flooding and the low success rate of treatment. In response to this technical difficulty, by performing physical simulation experiments in laboratory and taking the injection property and plugging capacity of elastic dispersed particle gel (DPG) in cores as indices, the matching principle between elastic DPG particles and pore throats in reservoir was studied using different matching coefficients. Meanwhile, the matching and in-depth profile control mechanism of DPG in core pore-throat was put forward to lay a foundation for its application in oilfields. The experimental results show that DPG particles are shaped as regular sphere with uniform distribution of particle size. When the optimal matching coefficient is within the ranged of 0.20-0.31, DPG particles have favorable injection property and plugging capacity. Through multipoint pressure measurement and SEM experiment, it can be observed that in the range of optimized matching coefficients, DPG particles are accumulated in the front end, mid-end and rear end of cores, and the plugging rate in each interval of long core can reach 80% and above, proving that DPG particles can realize the in-depth migration and effective in-depth profile control in porous media. The matching principle and in-depth profile control mechanism can be obtained by pressure difference gradient analysis. In case of large matching coefficient, DPG particles can be rapidly accumulated in the immediate vicinity of wellbore, leading to a sharp increase in injection pressure difference, and even blocking and polluting formations. In case of small matching coefficient, DPG particles are unable to be effectively accumulated in the large pore throats or preferential channels. When the matching coefficient is within the optimal interval, DPG has excellent in-depth migration and profile control ability, so as to divert the direction of subsequent fluid and greatly improve the sweep efficiency.

Key words: dispersed particle gel, plugging rate, matching relationship, in-depth profile control and oil displacement, enhanced oil recovery

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