油气藏评价与开发 ›› 2019, Vol. 9 ›› Issue (2): 25-32.

• 石油工程 • 上一篇    下一篇

闭合酸蚀裂缝导流能力模拟研究

赵立强1,缪尉杰1,罗志锋1,龚云蕾2,汪鹏3,李屹洋4   

  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. 中海石油湛江分公司,广东 湛江 524057
    3. 中国石油新疆油田公司第一采油厂,新疆 克拉玛依 834000
    4. 中国石油新疆油田公司重油开发公司,新疆 克拉玛依 834000
  • 收稿日期:2017-11-17 出版日期:2019-04-26 发布日期:2019-05-07
  • 作者简介:赵立强(1957—),男,博士生导师,油气藏增产改造理论与技术、采油气工程。
  • 基金资助:
    国家科技重大专项"大型油气田及煤层气开发——四川盆地大型碳酸盐岩气田开发示范工程"(2016ZX05052)

Simulation study on conductivity of closed acid cracks

Zhao Liqiang1,Miao Weijie1,Luo Zhifeng1,Gong Yunlei2,Wang Peng3,Li Qiyang4   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    2. Zhanjiang Branch of CNOOC(China), Zhanjiang, Guangdong 524057, China
    3. No. 1 Production Plant, Xinjiang Oilfield Company, CNPC, Karamay, Xinjiang 834000, China
    4. Heavy Oil Development Company, Xinjiang Oilfield Company, CNPC, Karamay, Xinjiang 834000, China
  • Received:2017-11-17 Online:2019-04-26 Published:2019-05-07

摘要:

酸蚀裂缝导流能力是影响酸压改造效果的关键所在。由于岩石性质、刻蚀形态及闭合压力等因素影响,很难对酸蚀裂缝导流能力进行准确的预测。目前,对于酸蚀裂缝几何形态和酸穿距离的计算模型较多,而就酸蚀裂缝导流能力的计算模型研究较少。为此,基于自仿射分形理论建立裂缝酸压模型,进行酸压模拟,利用局部立方规律(LCL)对闭合酸蚀裂缝导流能力进行预测,对影响闭合酸蚀裂缝导流能力的主要因素进行了正交模拟计算。结果表明,影响闭合酸蚀裂缝导流能力主要因素的影响程度从大到小依次为:闭合压力>分形维数>注酸时间>地层基质渗透率>注酸排量>标准偏差>地层基质孔隙度。

关键词: 分形理论, 酸蚀裂缝, 酸压模拟, 导流能力

Abstract:

The conductivity of acid cracks was the key to the transformation effects of acid fracturing. Due to the influences of rock properties, etching morphology and closing pressure, it was difficult to accurately predict the conductivity of acid fractures. Currently, there were many computational models for acid fractures geometry and acid penetration distance, but there were few researches on the computational model of flow capacity. For this reason, we built the acid fracturing model of cracks based on the improved self-affine fractal theory and applied it to the fractal fractures. And then, by the local cubic law(LCL), we built the acid fracture conductivity calculation model and applied the quadrature analysis to the main factors which affected the conductivity of the acid fracture after closure. The results showed that the influencing degree of those factors which affected the acid fracture conductivity were as follows: closure stress>fractal dimension>injection time>matrix permeability>injection rate>standard deviation>matrix porosity.

Key words: fractal theory, acid cracks, acid fracturing simulation, conductivity

中图分类号: 

  • TE357.2