A geochemical reaction-transport simulator for matrix acidizing analysis and design
A geochemical reaction-transport simulator for matrix acidizing analysis and design
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DOI：
10.1016/s0920-4105(96)00064-2
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发表时间：
1997-02
影响因子：
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通讯作者：
Xinghui Liu;A. Ormond;K. Bartko;L. Ying;P. Ortoleva
中科院分区：
文献类型：
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作者：
Xinghui Liu;A. Ormond;K. Bartko;L. Ying;P. Ortoleva
一个新的二维地球化学模拟器，CIRF。介绍了其在基质酸化分析与设计中的应用。该模拟器基于流体流动、物质输运和岩石/流体反应全耦合方程的求解，包括颗粒生长/溶解的影响以及矿物反应对孔隙度和渗透率的改变。我们的程序有一个大的内置热力学和动力学数据库。利用岩心酸化实验结果对模拟装置进行了测试。仿真结果与实验结果吻合较好。实验室和模拟结果都表明，酸化处理可能会引起地层损害，这是由于酸与岩石矿物反应产生的副产物的沉淀。在不同条件下进行了一系列模拟运行，以确定最小化酸致地层损害的策略。高注入速度和较高的酸浓度可以减少矿物沉淀和地层损害。该模拟器还用于预测砂岩地层中未受损和受损井的典型酸处理的渗透率和产能改善情况。我们的模拟器能够模拟所有的砂岩酸化过程，包括预冲洗、泥浆酸化处理、后冲洗和反生产。在碳酸盐岩地层中，基质酸化可能导致溶蚀指的发育和虫孔的形成。仿真结果表明，该仿真器还能捕捉到指动和虫洞现象。我们相信这种新的地球化学模拟器是基质酸化分析和设计的宝贵工具。
A new two-dimensional geochemical simulator, CIRF.A, and its application to matrix acidizing analysis and design are presented. The simulator is based on the solution of the equations of fully coupled fluid flow, species transport and rock/fluid reactions and includes the effects of grain growth/dissolution and the alteration of porosity and permeability due to mineral reactions. Our program has a large built-in thermodynamic and kinetic database. The simulator is tested by laboratory core acidizing results. It is demonstrated that simulation results are in good agreement with experimental observations. Both laboratory and simulation results indicate that an acidizing treatment may induce formation damage due to the precipitation of byproducts from the reactions of acids with rock minerals. A series of simulation runs have been carried out under different conditions to determine the strategy for minimizing the acid induced formation damage. High injection velocity and higher acid concentration are shown to reduce mineral precipitation and formation damage. The simulator is also used to predict permeability and productivity improvements for typical acid treatments of undamaged and damaged wells in sandstone formations. Our simulator is shown to be capable of simulating all the sandstone acidizing procedures that include pre-flush, mud acid treatment, after-flush and back production. In carbonate formations, matrix acidizing may lead to the development of dissolution fingers and the creation of wormholes. It is demonstrated that the simulator can also capture the fingering and wormholing phenomena. We believe this new geochemical simulator is an invaluable tool for matrix acidizing analysis and design.