高温、高盐环境双重交联凝胶调堵体系的制备及性能研究
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1.中国石油大学北京非常规油气科学技术研究院;2.中国石油化工股份有限公司西北油田分公司;3.天津大学化工学院

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中国石化科技研发项目:高温高盐油藏注水开发用功能型聚合物研制与应用(421089-2)


Synthesis and Performance Evaluation of Double Cross-linked Gel Plugging Agent Used in High-temperature and High-Salinity reservoirsYANG Zu-guo1,3, MA Qin-jie2,3, GUO Ji-xiang1, GUO Jin-tang4
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    摘要:

    与常规油藏相比较,高温高矿化度油藏的特殊条件对调堵体系的性能提出了更为严格的要求。针对现有油田调堵剂高温地层条件下凝胶时间较短、不耐稀释、长期稳定性差的问题,本文采用二级交联结构设计,研发了以甲基丙烯酸缩水甘油酯(GMA)、二乙二醇二甲基丙烯酸酯(EDMA)为主要原料,聚乙二醇(PEG)为溶剂,过氧化氢叔丁醇(TBHP)为引发体系、气相二氧化硅(AEROSIL)为增强剂,利用溶液聚合法合成了一种耐温耐盐性双重交联凝胶调堵剂。研究了单体加量、交联剂加量、引发剂加量以及增强剂加量对凝胶的成胶时间及弹性模量的影响。结果表明:该体系初始粘度350mPa?s,凝胶时间2~10h,弹性模量5230Pa,抗压强度0.221MPa,,在矿化度为 2.2×105 mg/L 的模拟地层水中140℃高温老化30天,无体积收缩,弹性模量可达4000Pa以上,驱替实验反向突破压力梯度达5.5MPa/m。

    Abstract:

    The high temperature and high salinity reservoirs put forward higher requirements for gel materials, compared with conventional reservoirs. The existing gel has the problems of short gel time, poor dilution resistance and poor long-term stability under high temperature formation conditions. We designed a two-stage cross-linked gel structure, the temperature-resistant and salt-resistant double-crosslinked gel plugging agent was synthesized by solution polymerization using glycidyl methacrylate ( GMA ) and diethylene glycol dimethacrylate ( EDMA ) as main raw materials, polyethylene glycol ( PEG ) as solvent, tert-butanol hydrogen peroxide ( TBHP ) as initiator system and fumed silica ( AEROSIL ) as reinforcing agent. We studied the effects of monomer dosage, crosslinking agent dosage, initiator dosage and reinforcing agent dosage on the gelation time and elastic modulus of the gel. The results show that the initial viscosity of the system is 350mPa . s, the gel time is 2 ~ 10h, the elastic modulus is 5230Pa, and the compressive strength is 0.221MPa.In the simulated formation water with a salinity of 2.2 × 105 mg / L, there is no volume shrinkage after aging at 140 °C for 30 days. The elastic modulus can reach more than 4000Pa, and the reverse breakthrough pressure gradient of the displacement experiment reaches 5.5MPa / m.

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  • 收稿日期: 2024-02-13
  • 最后修改日期: 2024-04-03
  • 录用日期: 2024-04-18
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