Experimental research on growth mechanism of acid wormhole in carbonate matrix

YANG Zhaozhong; DENG Zhuang; YU Mengnan; LI Xiaogang; HE Rui; HUANG He

doi:10.13809/j.cnki.cn32-1825/te.2020.02.004

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Experimental research on growth mechanism of acid wormhole in carbonate matrix
Vol. 10, Issue 2, Pages: 24-29(2020)
Published：2020
DOI： 10.13809/j.cnki.cn32-1825/te.2020.02.004
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DOI：

YANG Zhaozhong, DENG Zhuang, YU Mengnan, et al. Experimental research on growth mechanism of acid wormhole in carbonate matrix[J]. Petroleum Reservoir Evaluation and Development, 2020, 10(2): 24-29. DOI： 10.13809/j.cnki.cn32-1825/te.2020.02.004.

摘要

基质酸化是碳酸盐岩增产改造的重要措施之一

酸蚀蚓孔的形成规律及其影响因素研究是碳酸盐岩基质酸化的基础理论问题。设计了考虑酸液浓度、反应温度以及注酸排量三个影响因素的正交实验方案

并对取自A油田某碳酸盐岩储层的岩心进行酸液驱替实验

以分形维数及多重分形谱宽度为表征参数研究了各因素对酸蚀蚓孔形态的影响规律。优化目标是在获得最大分形维数的同时

尽量保证多重分形谱宽度最小。研究得出

在因素水平取值范围内

最优蚓孔形态对应的实验参数组合为：酸液浓度20 %

温度50~70 ℃

注酸排量2 cm

/min。各因素对分形维数及多重分形谱宽度影响程度从大到小依次为：注酸排量、酸液浓度及反应温度。设计基质酸化施工参数时应当着重考虑注酸排量的优化。

Abstract

Matrix acidification is one of the important measures for the stimulation of carbonate reservoirs. The studies on its formation regularity and influencing factors of acid wormhole are the basic theories of carbonate matrix acidification. An orthogonal experimental scheme considering three factors of acid injection rate

acid concentration and reaction temperature was designed. Acid displacement experiments were carried out on the cores taken from a carbonate reservoir in oilfield A. The influence of the factors on wormhole shape was studied by fractal dimension and multi-fractal spectrum width used as the target parameters. The optimization goal is to try to ensure the minimum width of multifractal spectrum while obtaining the maximum fractal dimension. Th

e results showed that in the range of factor values

the optimal combination of experimental parameters for wormhole shape was when the acid concentration was 20 %

the temperature was 50~70 °C

and the acid injection rate was 2 cm

/min. The factors affecting the fractal dimension and multi-fractal spectrum width were in a descending order as: acid injection rate

acid concentration and reaction temperature. Therefore

the optimization of the acid injection displacement should be emphasized in the design of the construction parameters of carbonate matrix acidification.