西南石油大学学报(自然科学版) ›› 2011, Vol. 33 ›› Issue (3): 125-129.

• 石油与天然气工程 • 上一篇    下一篇

低渗透储层酸预处理降低破裂压力机理

邓燕 薛仁江 郭建春
  

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-06-20 发布日期:2011-06-20

The Mechanism of High-Pressure High-Temperature and Low Permeability Acid Pretreatment to Reduce Fracturing Pressure

DENG Yan XUE Ren-jiang GUO Jian-chun
  

  1. State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-06-20 Published:2011-06-20

摘要: 针对高压、高温、低渗透等难动用储层安全高效压开的问题,从岩石力学性质因素研究入手,分析酸化过程中酸与矿物的反应,从微观结构上阐述酸化预处理降低破裂压力的机理,结合酸预处理后的铸体薄片、扫描电镜观察的微观实验和酸预处理前后的宏观力学性质测试结果,阐明了酸预处理降低破裂压力的机理。迪那地区过酸前后岩石力学的实验和破裂压力的计算结果表明:酸化预处理能够改变岩石的力学性质,并有效降低破裂压力,为这类储层开发提供技术思路。

关键词:

低渗透, 酸预处理, 岩石力学性质, 微观结构, 降低破裂压力

Abstract: The common ways to fracture reservoirs safely and effectively is hard to satisfy those with high pressure and high temperature but low permeability reservoirs. So the paper analyzes acid-mineral reaction in acid-treating

from mechanics which will affect rock properties, and explains how the mechanism of acid-pretreatment was used to decrease fracture pressure from micro-structure. Also the paper explains how acid-pretreatment can reduce fracturing pressure on the basis of the results of cast thin slice after acid pretreatment, microscopic observation of microcosmic experiments, and macroscopic mechanical test before and after acid pretreatment. The results of rock mechanical test and fracture pressure before and after pre-acid in DINA district show that acid-pretreatment can change mechanical property of rocks and can decrease fracture pressure effectively. The conclusions can provides a new technical solution for exploitation of this kind reservoirs

Key words:

low permeability, acid-pretreatment, rock mechanical property, micromechanism, decrease fracture pressure

中图分类号: