碳酸盐岩基质酸化蚓孔生长机理实验研究

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

Abstract

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. The 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 ³/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.

Key words: carbonate rock, wormhole, core flow test, X-Ray scan, fractal

CLC Number:

TE357

YANG Zhaozhong,DENG Zhuang,YU Mengnan,LI Xiaogang,HE Rui,HUANG He. Experimental research on growth mechanism of acid wormhole in carbonate matrix[J].Reservoir Evaluation and Development, 2020, 10(2): 24-29.

Figures/Tables 10

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References 21

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岩心编号	直径/mm	长度/mm	孔隙度	渗透率/10^-3 μm²
1-1	25.1	30.2	0.233	19.5
1-2	25.0	30.0	0.217	21.1
1-3	25.0	30.4	0.221	21.2
1-4	24.9	29.8	0.223	20.4
1-5	25.0	29.8	0.219	21.4
1-6	24.8	30.1	0.242	18.0
1-7	25.0	30.3	0.240	18.5
1-8	24.9	30.3	0.239	18.3
1-9	25.1	30.5	0.226	20.5

序号	酸液浓度/%	反应温度/℃	注酸排量/（cm³·min^-1）
水平1	20	90	2.0
水平2	15	70	1.0
水平3	10	50	0.5

岩心编号	酸液浓度/%	反应温度/℃	注酸排量/（cm³·min^-1）
1-1	15	70	2.0
1-2	10	90	1.0
1-3	15	90	0.5
1-4	10	50	2.0
1-5	20	50	0.5
1-6	10	70	0.5
1-7	20	90	2.0
1-8	15	50	1.0
1-9	20	70	1.0

岩心编号	酸液浓度/%	反应温度/℃	注酸排量/（cm³·min^-1）	表征参数
岩心编号	酸液浓度/%	反应温度/℃	注酸排量/（cm³·min^-1）	分形维数	多重分形谱宽度
1-1	15	70	2.0	1.294	0.495
1-2	10	90	1.0	1.215	0.563
1-3	15	90	0.5	1.116	0.592
1-4	10	50	2.0	1.325	0.517
1-5	20	50	0.5	1.267	0.514
1-6	10	70	0.5	1.203	0.582
1-7	20	90	2.0	1.312	0.516
1-8	15	50	1.0	1.277	0.489
1-9	20	70	1.0	1.381	0.471

Experimental research on growth mechanism of acid wormhole in carbonate matrix

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岩心编号	酸液浓度/%	反应温度/℃	注酸排量/（cm³·min^-1）
1-1	15	70	2.0
1-2	10	90	1.0
1-3	15	90	0.5
1-4	10	50	2.0
1-5	20	50	0.5
1-6	10	70	0.5
1-7	20	90	2.0
1-8	15	50	1.0
1-9	20	70	1.0

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岩心编号	酸液浓度/%	反应温度/℃	注酸排量/（cm³·min^-1）
1-1	15	70	2.0
1-2	10	90	1.0
1-3	15	90	0.5
1-4	10	50	2.0
1-5	20	50	0.5
1-6	10	70	0.5
1-7	20	90	2.0
1-8	15	50	1.0
1-9	20	70	1.0

岩心编号	酸液浓度/%	反应温度/℃	注酸排量/（cm³·min^-1）
1-1	15	70	2.0
1-2	10	90	1.0
1-3	15	90	0.5
1-4	10	50	2.0
1-5	20	50	0.5
1-6	10	70	0.5
1-7	20	90	2.0
1-8	15	50	1.0
1-9	20	70	1.0