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Geochemical modeling and experimental evaluation of high-pH floods: Impact of Water-Rock interactions in sandstone

机译：高pH洪水的地球化学建模和实验评估：砂岩中水-岩相互作用的影响

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摘要

Injection of alkaline solutions in reservoir leads to mineral dissolution and precipitation, possibly resulting in changes in permeability and porosity, and consequently altering solution pH. Accurate prediction of pH, alkali consumption and aqueous chemistry changes are required to design suitable chemical blends in alkaline-polymer (AP) or alkaline-surfactant-polymer (ASP) flooding. Excessive consumption of alkali can result in degradation of flood performance and lower than expected oil recovery. We report state-of-the-art geochemical simulation results for sandstone reservoir mineral assemblages and alkali solutions (NaOH, Na_2CO_3, and NaBO_2) employed in AP and ASP formulations. Single-phase high-pH core-floods were completed using Berea sandstone and reservoir samples to calibrate and validate geochemical simulations. Results show that rock-fluid interactions depend strongly on mineral type and amount, alkaline solution injection flowrate, and composition of the injected and formation water. Anhydrite, a commonly found calcium sulfate, significantly impacts pH buffering capacity, water chemistry and permeability damage against conventional alkali agents in chemical flooding particularly for Na_2CO_3, but no significant pH buffering is observed during NaBO_2 flooding. Experimental data and model results show that the pH-buffering effect is maintained even after several pore volumes of alkaline solution are injected, if a sufficient fraction of relevant minerals is present. The end consequence of this is insufficient alkalinity for reactions with the oil phase and the likely formation damage.
机译：将碱性溶液注入储层会导致矿物溶解和沉淀，可能导致渗透率和孔隙率变化，从而改变溶液的pH值。要设计碱性聚合物（AP）或碱性表面活性剂聚合物（ASP）驱油中的合适化学共混物，需要准确预测pH，碱消耗和水化学变化。过量消耗碱会导致防洪性能下降，且采油率低于预期。我们报告了用于AP和ASP配方中的砂岩储层矿物组合和碱溶液（NaOH，Na_2CO_3和NaBO_2）的最新地球化学模拟结果。使用Berea砂岩和储层样品完成了单相高pH岩心驱替，以校准和验证地球化学模拟。结果表明，岩石-流体的相互作用在很大程度上取决于矿物的类型和数量，碱性溶液注入的流量以及注入的和地层水的组成。硬石膏是一种常见的硫酸钙，在化学驱中，特别是对于Na_2CO_3，显着影响pH缓冲能力，水化学性质和对常规碱剂的渗透性损害，但在NaBO_2驱过程中未观察到显着的pH缓冲。实验数据和模型结果表明，即使存在足够数量的相关矿物质，即使注入了几个孔体积的碱性溶液，pH缓冲作用也能保持。最终的结果是碱度不足以与油相反应，并可能破坏地层。

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  • 来源
    《Fuel》 |2012年第1期|p.216-230|共15页
  • 作者

    Mahdi Kazempour; Eric Sundstrom; Vladimir Alvarado;

  • 作者单位

    Department of Chemical and Petroleum Engineering, University of Wyoming, Laramie, WY 82071, USA;

    Department of Chemical and Petroleum Engineering, University of Wyoming, Laramie, WY 82071, USA;

    Department of Chemical and Petroleum Engineering, University of Wyoming, Laramie, WY 82071, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    alkaline flood; anhydrite; ph buffering; oil recovery; chemical flooding;

    机译：碱性洪水硬石膏ph缓冲采油;化学驱;

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