Chemical Industry and Engineering Progress ›› 2025, Vol. 44 ›› Issue (11): 6542-6551.DOI: 10.16085/j.issn.1000-6613.2024-1648

• Materials science and technology • Previous Articles    

Influence regulation of different molecular structure relative permeability modifier on controlling water cut and stabilizing oil performance

WEN Xuejun1(), GUO Yongjun1,2,3(), ZHANG Wei3,4, PU Di3,5, LI Huabing3,4, JIN Cheng2, LI Zhenwu1, ZHANG Xinming1,3   

  1. 1.School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China
    2.School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, Sichuan, China
    3.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, China
    4.Sichuan Guangya Polymer Chemical Co. , Ltd. , Nanchong 637900, Sichuan, China
    5.Xinjiang Guangya Oil and Gas New Technology Development Co. , Ltd. , Karamay 834000, Xinjiang, China
  • Received:2024-10-13 Revised:2024-11-18 Online:2025-12-08 Published:2025-11-25
  • Contact: GUO Yongjun

不同分子结构相对渗透率改善剂对控水稳油性能的影响规律

闻学军1(), 郭拥军1,2,3(), 张伟3,4, 蒲迪3,5, 李华兵3,4, 金诚2, 李镇武1, 张新民1,3   

  1. 1.西南石油大学化学化工学院,四川 成都 610500
    2.西南石油大学新能源与材料学院,四川 成都 610500
    3.西南石油大学油气藏地质及开发工程国家重点实验室,四川 成都 610500
    4.四川光亚聚合物化工有限公司,四川 南充 637900
    5.新疆光亚油气新技术发展有限公司,新疆 克拉玛依 834000
  • 通讯作者: 郭拥军
  • 作者简介:闻学军(1999—),男,硕士研究生,研究方向为油田功能化学剂。E-mail:13890560192@163.com
  • 基金资助:
    克拉玛依八区压舱石示范工程研究课题(2023YQX10206);新疆维吾尔自治区“天池英才”第二批引进计划(2023)

Abstract:

Currently, polyacrylamide, used as a relative permeability modifier (RPM), exhibits limited effectiveness in water control and enhancing production in high water cut reservoirs. To improve the performance of polymers in controlling both water and oil, this study selected three polymers with distinct molecular structures as RPMs. Under specific conditions, the water cut control, oil stabilization and injection performance of these RPMs were compared and analyzed. Among them, RPMs-Ⅰ (polyacrylamide modified with a cationic adsorption group), adsorbed onto the pore surface via electrostatic interactions, significantly reducing the pore channel radius. This resulted in a high water shutoff rate (83.86%—96.66%) and a substantial oil shutoff rate (37.14%—53.52%) although it demonstrated poor injection performance. RPMs-Ⅱ (polyacrylamide modified with a hydrophobic association group) formed a reversible supramolecular network within the pore channels through intermolecular associations, which effectively hindered water while allowing for oil dissociation release the flow channel. This RPM achieved a moderate water shutoff rate (37.78%—43.30%) and oil shutoff rate (20.45%—30.00%) while maintaining excellent injection performance. RPMs-Ⅲ combined both cationic adsorption and hydrophobic association mechanisms. By optimizing the functional group content, an adsorption associate RPM with a high water shutoff rate (64.58%) and a low oil shutoff rate (19.05%) was identified, showcasing excellent injection performance. The optimized adsorption associate RPMs exhibited water shutoff rates of 64.58%—71.15% at molecular weights of 5 million and 7 million, corresponding to permeabilities of approximately 200mD and 500mD. Conversely, "oil penetration" occurred at a molecular weight of 3 million. Specifically, polymers with molecular weights of 5—7 million were more suitable for reservoirs with permeabilities of 200—500mD, while those with a molecular weight of 3 million were appropriate for reservoirs below 200mD. Reservoirs exceeding 500mD may necessitate higher molecular weight polymers for effective adaptation. This research provided valuable guidance for optimizing RPMs tailored to various high water cut reservoirs.

Key words: polymers, relative permeability modifier, controlling water cut and stabilizing oil, cationic, hydrophobic association, adsorption, permeability

摘要:

目前,聚丙烯酰胺作为相对渗透率改善剂(RPM)在高含水油藏控水增产中效果有限。为进一步提升聚合物控水稳油性能,本文选用3类典型分子结构模型聚合物作为相渗剂,在一定条件下,对比研究了不同结构相渗剂控水稳油性能和注入性能。其中,Ⅰ类相渗剂(引入阳离子吸附基团的改性聚丙烯酰胺)通过静电作用大量吸附在孔隙表面,极大减小了孔隙通道半径,具有高堵水率(83.86%~96.66%)、高堵油率(37.14%~53.52%)和注入性能差的特性;Ⅱ类相渗剂(引入疏水缔合基团的改性聚丙烯酰胺)通过分子间缔合作用在孔隙通道内形成可逆的超分子网状结构,对水具有阻碍能力的同时,遇油通过“解缔合”作用释放通道,具有适当的堵水率(37.78%~43.30%)和堵油率(20.45%~30.00%),且注入性能优秀的特性;Ⅲ类相渗剂(同时引入阳离子吸附基团和疏水缔合基团的改性聚丙烯酰胺)同时具有“吸附+缔合”双重机制,通过功能基团含量优化,可优选出具有高堵水率(64.58%)和低堵油率(19.05%)的吸附缔合型相渗剂,其注入性能优秀。优选出的吸附缔合型相渗剂在500×104和700×104分子量、约200mD和500mD渗透率下,具有较高堵水率(64.58%~71.15%),在300×104分子量下皆出现“透油”现象。结果表明,500×104~700×104分子量聚合物可能更适用200~500mD的储层,300×104分子量聚合物可能适用于200mD以下的储层,500mD以上的储层可能需要更高分子量聚合物进行适配。本文为指导优选适应各种高含水油藏的相渗剂提供方向和参考意见。

关键词: 聚合物, 相对渗透率改善剂, 控水稳油, 阳离子, 疏水缔合, 吸附, 渗透率

CLC Number: 

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