稠油分散性降黏剂降黏效果评价及微观驱油机理*
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中石化胜利油田分公司勘探开发研究院 山东 东营 257015

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TE345

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中石化股份公司科研项目“稠油蒸汽吞吐低耗高效开发整体优化技术”(项目编号:P19018-5)


Viscosity Reduction Effect Evaluation and Micro Oil Displacement Mechanism of Dispersive Viscosity Reducer for Heavy Oil
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    摘要:

    为解决胜利油田稠油热采开发成本高的问题,评价了一种水溶性降黏剂-分散性降黏剂的降黏效果,分析了稠油降黏前后的分子结构和粘附力变化,利用微观可视化驱油实验模型研究了微观驱油机理。研究结果表明,地层温度56℃下,分散性降黏剂溶液最佳浓度为2.0%。降黏剂溶液与稠油最佳体积配比为1:6,降黏率达到94.58%。分散性降黏剂分子间作用力以氢键为主,结构稳定。降黏剂与稠油混合后,稠油颗粒发生扩散,降黏剂中的P-OH基团与羧酸跟OH-插层进入稠油分子间,拆散胶质沥青质复杂片状分子结构,破坏胶体分散体系与胶质沥青质空间网络结构,分子结构变得松散,缔合作用减弱,粘附力由1.2×10-7N下降到5.4×10-8N,降幅超过1倍,分子间内摩擦力下降,导致原油黏度降低。分散性降黏剂分子微观上能够将吼道盲端、并联喉道以及低渗通道小孔喉区域的剩余油分散携带并剥离,具有洗油和调驱能力,微观上剩余油分布模式主要表现为包围式簇状、并联式喉道状、死角式点状及绕流式粒间孔喉状。

    Abstract:

    In order to solve the problem of high development cost of heavy oil thermal recovery in Shengli Oilfield, the viscosity reduction effect of a water-soluble viscosity reducer dispersive viscosity reducer was investigated. The changes of molecular structure and adhesion force of heavy oil before and after viscosity reduction were analyzed. The microscopic oil displacement mechanism was studied with microscopic visual oil displacement experimental model. The results show that the optimal concentration of dispersive viscosity reducer solution is 2% at formation temperature of 56 ℃. The optimal volume ratio of viscosity reducer solution to heavy oil is 1:6, and the viscosity reduction rate reaches 94.58%. The intermolecular force of dispersive viscosity reducer is mainly hydrogen bond, and its structure is stable. When the viscosity reducer is mixed with heavy oil, the heavy oil particles diffuse, and the P-OH group and carboxylic acid in the viscosity reducer intercalate into the heavy oil molecules. The complex sheet molecular structure of gum and asphaltene is broken, and the space network structure of colloidal asphaltene is destroyed. The molecular structure becomes loose and the association effect is weakened. The adhesion force decreases from 1.2×10-7N to 5.4×10-8N, with more than double drop. The viscosity of crude oil decreases due to the decline of internal friction between molecules. On the micro level, the dispersive viscosity reducer can disperse and separate the remaining oil from the blind end of the throat, parallel throat and small hole throat of the low permeability channel demonstrating the ability of oil displacement efficiency and profile control. The micro remaining oil distribution patterns are mainly surrounded cluster, parallel throat, dead corner point and circumfluent pore throat.

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  • 收稿日期:2020-10-29
  • 最后修改日期:2020-12-18
  • 录用日期:2020-12-23
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