Mechanism of the effect of long-term water injection on mechanical
properties of tight sandstone

ZHAO Bo; ZHANG Guang-qing; TANG Mei-rong; ZHUANG Jian-man; LIN Can-kun

doi:10.16285/j.rsm.2018.0989

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Mechanism of the effect of long-term water injection on mechanical properties of tight sandstone

更新时间：2026-06-25

- Mechanism of the effect of long-term water injection on mechanical properties of tight sandstone
- Vol. 40, Issue 9, Pages: 3344-3350(2019)
- 作者机构：
  
  1. 中国石油大学（北京）石油工程学院,北京,102249
  2. 长庆油田油气工艺研究院,陕西,西安,710018
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.0989
  CLC： TE311
- Online First：03 September 2019，
  
  Published：2019
- 稿件说明：
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ZHAO Bo, ZHANG Guang-qing, TANG Mei-rong, et al. Mechanism of the effect of long-term water injection on mechanical properties of tight sandstone[J]. 2019, 40(9): 3344-3350.
DOI：

ZHAO Bo, ZHANG Guang-qing, TANG Mei-rong, et al. Mechanism of the effect of long-term water injection on mechanical properties of tight sandstone[J]. 2019, 40(9): 3344-3350. DOI： 10.16285/j.rsm.2018.0989.

摘要

注水开发是致密砂岩油藏增产的重要手段，长时间注水会改变地层岩石物理力学性质，影响油井产量。为探究长时间注水对地层岩石物理力学性质影响的微观机制，选取同一储层已注水15 a及尚未注水岩芯进行对比试验分析。通过试验得到了注水前后地层岩石在弹性力学参数、矿物成分、微观孔隙结构等方面的差异。长时间注水后，岩石矿物成分及内部结构发生变化，主要表现为黏土矿物及方解石含量降低，岩石颗粒间填充物及胶结物大量减少，中小孔隙发育为大孔隙，孔隙度增大，进而导致致密砂岩力学性质弱化，变形能力增大。

Abstract

Water injection is an important means to increase the production of tight sandstone reservoirs

which is widely used in tight oil and gas exploration. However

long-term water injection changes the physical and mechanical properties of formation rocks and further affects the production of oil wells. Comparison experiments were carried out on the same formation cores with water injection for 15 years and without water injection to explore the microscopic mechanism of the effect. The differences of elastic mechanics parameters

mineral composition and microscopic structure of the formation rocks before and after water injection were obtained through experiments. After the long-time water injection

the mineral composition and internal structure of rock were changed. Especially the loss of clay minerals in the form of cement and fillers caused a decrease in the cohesion among the rock particles and an increase in the porosity. After long-time water injection

clay minerals and calcite content decreased

the fillers and cements between rocks particles reduced

the small pores developed into large pores. Thus

the mechanical properties of sandstone were weakened and the deformation capacity increased.

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