Multifactorial experiment of acid’s fingering phenomenon in the multi-stage alternating injection of acid fracturing

Luo Zhifeng; Yu Yang; Zhao Liqiang; LI Xiaogang; Zhao Xingdong

doi:10.13809/j.cnki.cn32-1825/te.2018.04.008

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Multifactorial experiment of acid’s fingering phenomenon in the multi-stage alternating injection of acid fracturing
Issue 4, Pages: 36-41(2018)
Published：2018
DOI： 10.13809/j.cnki.cn32-1825/te.2018.04.008
稿件说明：

移动端阅览

[1]罗志锋,余洋,赵立强,李小刚,赵兴东.多因素下多级交替注入酸液指进实验研究[J].油气藏评价与开发,2018,8(04):36-41. DOI： 10.13809/j.cnki.cn32-1825/te.2018.04.008.

Luo Zhifeng, Yu Yang, Zhao Liqiang, et al. Multifactorial experiment of acid’s fingering phenomenon in the multi-stage alternating injection of acid fracturing[J]. Petroleum Reservoir Evaluation and Development, 2018, (4): 36-41. DOI： 10.13809/j.cnki.cn32-1825/te.2018.04.008.

摘要

酸液黏性指进演化特征及最终形态受多种工程地质因素影响

利用可视化指进实验装置

以分形维数和多重分形谱宽度表征指进形态

综合考虑酸液浓度、注入级数、温度、施工排量、前置液酸液黏度比和裂缝倾角六个因素

探究多因素下酸液黏性指进演化特征及最终形态的变化规律。结果表明:各个因素对分形维数的影响程度由高到低依次为:黏度比、注入级数、温度、酸液浓度、施工排量、裂缝倾角;各个因素对多重分形谱宽度的影响程度由高到低依次为:黏度比、裂缝倾角、施工排量、酸液浓度、注入级数、温度;要实现黏性指进酸压

应当提高黏度比至100∶1

50∶1

控制注入级数为2

级

设计酸液用量占比0.3左右

并在注入酸液前注入大量前置液降低裂缝壁面温度。

Abstract

The evolution characteristics and the final shape of acid viscosity fingering are influenced by many engineering and geological factors. So that

we used the visual experimental device to explore the change rules under the multifactor. Six factors were considered

those are the concentration of acid

the injection series

the temperature

the construction displacement

the viscosity ratio of the liquid

and the inclination of crack. The fractal dimension and multifractal spectrum width were used to describe the morphological of fingering. It is concluded that the influence degree of each factor on fractal dimension from high to low is in the order of: viscosity ratio

injection series

temperature

acid concentration

construction displacement

and crack inclination. The influence degree of each factor on the multifractal spectrum width from high to low is in the order of: viscosity ratio

crack inclination

construction displacement

acid concentration

injection series

and temperature. In order to achieve the viscosity fingering of acid fracturing

the viscosity ratio should be increased to the value between 100∶1 and 150∶1

the controlled injection series are at level 2 to level 3