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∶1~150∶1,控制注入级数为2~3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。
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,and the designed acid dosage is about 0.3.Meanwhile,a large number of pre-liquid was injected to reduce the crack wall's temperature before the acid injection.
作者
罗志锋
余洋
赵立强
李小刚
赵兴东
Luo Zhifeng;Yu Yang;Zhao Liqiang;Li Xiaogang;Zhao Xingdong(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Engineering Technology Research Institute of Southwest Oil and Gas Company of CNPC,Chengdu,Sichuan 610000,China)
出处
《油气藏评价与开发》
CSCD
2018年第4期36-41,共6页
Petroleum Reservoir Evaluation and Development
基金
国家自然科学基金"致密油气藏体积酸压复杂缝网扩展延伸仿真模型研究"(51404207)
关键词
酸压
酸液指进
物理模拟
分形维数
多重分形谱宽度
acid fracturing
acid's fingering
physical simulation
fractal dimension
multifractal spectrum width
