油气藏评价与开发 ›› 2018, Vol. 8 ›› Issue (4): 36-41.

• 石油工程 • 上一篇    下一篇

多因素下多级交替注入酸液指进实验研究

罗志锋1,余洋1,赵立强1,李小刚1,赵兴东2   

  1. 1. 西南石油大学油气藏地质及开发工程国家重点实验室,四川 成都 610500
    2. 中国石油西南油气田分公司工程技术研究院,四川 成都 610000
  • 收稿日期:2017-10-10 出版日期:2018-08-26 发布日期:2018-11-28
  • 作者简介:罗志锋(1981—),男,副教授,博士,油气藏动态及增产改造理论与技术。
  • 基金资助:
    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)

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

Luo Zhifeng1,Yu Yang1,Zhao Liqiang1,Li Xiaogang1,Zhao Xingdong2   

  1. 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    2. Engineering Technology Research Institute of Southwest Oil and Gas Company of CNPC, Chengdu, Sichuan 610000, China
  • Received:2017-10-10 Online:2018-08-26 Published:2018-11-28

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。

关键词: 酸压, 酸液指进, 物理模拟, 分形维数, 多重分形谱宽度

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, 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.

Key words: acid fracturing, acid's fingering, physical simulation, fractal dimension, multifractal spectrum width

中图分类号: 

  • TE319