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渤海油田聚合物凝胶渗流特性及驱油效果实验研究

Study on the Percolation Property and Flooding Effect of Polymer Gel in Bohai Oilfield

作者: 专业:油气田开发工程 导师:卢祥国 年度:2015 学位:硕士  院校: 东北石油大学

Keywords

Bohai-oilfield, instant polymers, Cr3+ polymer gel, parameter optimization, Adaptability evaluation

        渤海油藏具有储层厚度大、平均渗透率高、非均质性严重、原油粘度高和注入水矿化度高等特点,导致水驱开发效果较差,亟待采取强化液流转向措施来扩大波及体积和改善水驱开发效果。近年来,在SZ36-1和LD10-1油田开展了聚合物驱和聚合物凝胶调驱矿场试验,取得了明显增油降水效果,但现有聚合物干粉熟化技术还不能完全满足渤海油田调驱技术需求,如何缩短聚合物干粉熟化时间是技术人员关心的问题。依据渤海油田开发技术需求,本课题以油藏工程、物理化学和高分子化学为理论指导,以仪器分析、化学分析和物理模拟为技术手段,以粘度性能、流变学性能、渗流特性和驱油效果为评价指标,以渤海主要油田油藏地质特征和流体性质为工程依据,开展了速溶聚合物溶液和聚合物凝胶组成优化和性能评价,并进行了聚合物凝胶调驱技术油藏适应性实验研究。结果表明,采用正交试验方法和粘度为评价指标,优化聚合物凝胶组成为:速溶聚合物(CP=3000mg/L),有机铬交联剂(聚:Cr3+=270:1)。聚合物凝胶性能各因素水平变动对综合指标影响重要程度顺序为:聚合物浓度>聚合物类型>交联剂类型>聚:Cr3+。与相同浓度聚合物溶液相比较,Cr3+聚合物凝胶阻力系数和残余阻力系数较大,并且后续水驱阶段初期注入压力不降反升,表现出独特渗流特性。交联剂Cr3+与聚合物分子可以在多孔介质内发生交联反应,岩心渗透率愈高,孔隙空间尺寸愈大,成胶效果愈好,并且静态条件下成胶效果要好于动态条件下的成胶效果。随岩心平均渗透率和渗透率变异系数增加、调驱时机提前,聚合物凝胶调驱增油效果变好。采用物理模拟方法和采收率指标,优化Cr3+聚合物凝胶组成:速溶聚合物,Cp=1000mg/L~2500mg/L。交联剂为有机铬“交联剂3”,“聚:Cr3+”=120:1~270:1。段塞尺寸范围0.05PV~0.15PV。
    Bohai oilfield is characterized by large reservoir thickness, high average permeability, serious heterogeneity, high viscosity of crude oil and high water salinity, which influenced greatly the oilfield water flooding development results. Therefore, it is urgent to take technical measures for profile controlling in order to expand swept volume. In recent years, polymer flooding and polymer gel flooding field test have been carried out in SZ36-1 and LD10-1 oil field,with an obvious effect in increasing oil production and decreasing water production, but the existing polymer powder curing technology can not fully meet the needs of Bohai oilfield flooding technology, and how to shorten the polymer powder curing time is problem which technical personnel concerned. According to the Bohai oilfield development technology requirements, optimization for soluble polymer and its polymer gel composition and performance evaluation has been conducted and study on polymer gel reservoir adaptability for profile controlling has been carried out through reservoir engineering, physical chemistry and polymer chemistry as theoretical guidance, instrumental analysis, chemical analysis and physical simulation as technology, the viscosity properties, rheological properties, seepage characteristics and oil displacement efficiency as the evaluation index and the geological characteristics and fluid properties in Bohai main oilfield as engineering basis. The results show that using the orthogonal test method and the viscosity as the evaluation index,optimization of polymer gel combination is the production of instant polymer Shengli oil field(CP=3000mg/L), organic chrome crosslinking agent(poly Cr3+=270:1). The level of each factor of properties of polymer gel changes impact on the comprehensive index important degree sequence is polymer concentration > polymertype > cross-linking agent type > poly: Cr3+. Compared with the same concentration of polymer solution, Cr3+ polymer gelresistance coefficient and residual resistance coefficient is larger, and the injection pressure during the subsequent water flooding stage did not fall but rise, showing the unique seepage characteristics. Cross linking agent Cr3+ and polymer can occur crosslinking reaction in porous media,and the higher permeability and the bigger pore space size, the better gelling effect,and the gelling effect in static conditions is better than the one in dynamic conditions. With the average core permeability and the permeability variation coefficient increaseing and flooding time advanced, polymer gel flooding oil increasing effect is better. Based on physical simulation method and recovery index, optimization of Cr3+ polymer gel composition should be as follow: Shengli oilfield production of instant polymers,Cp=1000mg/L ~ 2500mg/L. The crosslinking agent is the organic chromium “crosslinking agent 3”, "poly:Cr3+" =120:1 ~ 270:1. Slug size ranges from 0.05 PV to 0.15 PV.
        

渤海油田聚合物凝胶渗流特性及驱油效果实验研究

摘要4-5
ABSTRACT5
第一章 绪论9-12
    1.1 聚合物凝胶发展历史、技术现状和存在问题9-11
        1.1.1 发展历史和技术现状9-10
        1.1.2 存在问题10-11
    1.2 论文研究内容11-12
第二章 Cr~(3+)凝胶性能评价及其配方优选12-34
    2.1 实验条件12-16
        2.1.1 实验材料12
        2.1.2 仪器设备12-13
        2.1.3 方案设计13-16
    2.2 结果分析16-32
        2.2.1 聚合物溶液粘度性能评价16-18
        2.2.2 聚合物凝胶配方筛选及其性能评价18-28
        2.2.3 聚合物溶液渗流特性及其影响因素28-29
        2.2.4 聚合物凝胶渗流特性及其影响因素29-32
    2.3 小结32-34
第三章 多孔介质对Cr~(3+)聚合物凝胶成胶效果影响研究34-44
    3.1 实验条件34-37
        3.1.1 实验材料34
        3.1.2 仪器设备34-35
        3.1.3 实验原理35-36
        3.1.4 方案设计36-37
    3.2 结果分析37-43
        3.2.1 静态成胶效果及其影响因素37-40
        3.2.2 动态成胶效果评价40-43
    3.3 小结43-44
第四章 Cr~(3+)聚合物凝胶油藏适应性实验研究44-52
    4.1 实验条件44-46
        4.1.1 实验材料44
        4.1.2 仪器设备44-45
        4.1.3 方案设计45-46
    4.2 结果分析46-51
        4.2.1 岩心平均渗透率的影响46-47
        4.2.2 岩心渗透率变异系数的影响47-48
        4.2.3 注入时机的影响48-50
        4.2.4 原油粘度的影响50-51
    4.3 小结51-52
第五章 Cr~(3+)聚合物凝胶调驱工艺参数优化52-65
    5.1 实验条件52-54
        5.1.1 实验材料52
        5.1.2 经济效益评价52
        5.1.3 仪器设备52-53
        5.1.4 方案设计53-54
    5.2 结果分析54-64
        5.2.1 聚合物凝胶强度的影响54-57
        5.2.2 剪切作用的影响57-58
        5.2.3 注入速度的影响58-59
        5.2.4 聚合物凝胶段塞尺寸的影响59-61
        5.2.5 其它工艺参数的影响61-64
    5.3 小结64-65
结论65-66
参考文献66-70
发表文章目录70-71
参加科研项目71-72
致谢72-73
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