Investigation of Removing AsphalteneResin-Paraffin Deposits by Chemical Method for Azerbaijan High-Paraffin Oil Production Process

沥青质-树脂-石蜡沉积物（ARPD）是油气行业中一个复杂且普遍存在的问题，它影响着石油开采、生产、运输和加工系统的效率和完整性。本文针对阿塞拜疆油田中观察到的ARPD问题，提出了一种化学方法，并优化了化学抑制剂的类型和浓度。通过储层模拟检测了选定化学试剂对抑制ARPD量和提高油采收率的效果。在实验室条件下，测试了三种新化学化合物（即Chemical-A、Chemical-B和Chemical-C）对阿塞拜疆高石蜡油田样品（X、Y和Z）流变性的影响。实验结果表明，Chemical-C以600克/吨的浓度具有最佳的效率。添加Chemical-C后，原油的冰点从12°C降至-4°C，ARPD量从0.185克降至0.016克，油有效粘度从16.2 mPa·s降至3.1 mPa·s。研究确定，对于水驱和CO2驱，较高的注入压力导致沥青质沉淀减少。添加选定的ARPD抑制剂后，水驱的油采收率可以从52%增加到62%，而CO2驱可以从55%增加到68%。

CMG软件应用情况：

CMG软件中的GEM模拟器用于模拟研究，通过GEM和Winprop模拟器模拟了水驱和CO2驱生产过程中的沥青质沉淀。研究了沥青质形成机制及其在储层中的影响。模拟了沥青质沉淀在储层中的行为，并研究了沥青质沉淀对油藏的影响。模拟结果显示，考虑沥青质沉淀的水驱和CO2驱的石油采收率率分别提高了62%和68%。

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Abstract:

Asphaltene-resin-paraffin deposition (ARPD) is a complicated and prevalent issue in oil and gas industry, impacting the efficiency, integrity of petroleum extraction, production, transportation and processing systems. Considering all witnessed ARPD problems in Azerbaijan oil fields, this paper proposed a chemical method and optimized the type and the concentration of chemical inhibitors. And then the effect of selected chemical reagent on inhibiting the ARPD amount and thus enhancing oil recovery was detected by reservoir simulation during both waterflooding and CO2 flooding production. Three new chemical compounds (namely, Chemical-A, Chemical-B and Chemical-C) were examined in laboratory conditions and their impact on rheological properties of high-paraffin oilfield samples of Azerbaijan (X, Y and Z) were investigated. Experimental results show that Chemical-C with concentration of 600 g/t has the best efficiency for alleviating the problems. After adding Chemical-C to the crude oil, the freezing point of oil is decreased from 12 °C to (- 4) °C, ARPD amount is declined from 0.185 to 0.016 g and oil effective viscosity is reduced from 16.2 mPa·s to 3.1 mPa·s. It is determined that for water and CO2 flooding, higher injection pressure resulted in reduced asphaltene precipitation. Adding selected ARPD inhibitor, the oil recovery for waterflooding can increase from 52% to 62%, while it can rise from 55% to 68% for CO2 flooding.

Keywords: asphaltene-resin-paraffin deposition (ARPD); rheological properties; freezing point; enhanced oil recovery.

中文作者单位：

  1. 中国石油大学（北京）石油工程学院
  2. 阿塞拜疆国立石油和工业大学油气运输与储存系
  3. 阿塞拜疆国立石油和工业大学无机物质化学与技术系

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