煤层气储层应力敏感性定量表征及影响因素研究

王镜惠; 梅明华; 梁正中; 王华军

doi:10.11781/sysydz201806859

煤层气储层应力敏感性定量表征及影响因素研究

doi: 10.11781/sysydz201806859

1. 榆林学院化学与化工学院, 陕西榆林 719000;
2. 中国石油长庆油田分公司第二采气厂, 陕西榆林 719000

基金项目:

陕西省自然科学基础研究计划“鄂尔多斯盆地东北部异常压力形成与页岩气富集机理研究”（2017JM4017）资助。

详细信息

作者简介:
王镜惠(1984-),男,硕士,讲师,从事油气地质勘探及油气田开发研究。E-mail:361828422@qq.com。

中图分类号: TE135
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出版历程
- 收稿日期: 2018-05-25
- 修回日期: 2018-09-17
- 刊出日期: 2018-11-28

Controls and quantitative characterization of stress sensitivity for coal seams

1. School of Chemistry and Chemical Engineering, Yulin University, Yulin, Shaanxi 719000, China;
2. Second Gas Production Plant, PetroChina Changqing Oilfield Branch Company, Yulin, Shaanxi 719000, China

摘要

摘要: 煤层气储层应力敏感性较强，对煤层气开发具有重要影响。采用不同区块天然煤样开展应力敏感性室内实验，应用应力敏感性系数和渗透率伤害系数2个参数评价了各煤样应力敏感性程度，并研究了煤阶、渗透率和储层气体压力等参数对煤岩应力敏感性的影响。结果表明：镜质组反射率R_o<1.7%时，煤阶越低，应力敏感性程度越大，渗透率伤害程度越高；而镜质组反射率R_o>1.7%时，煤阶越高，应力敏感性程度越大，渗透率损害程度越高；煤岩初始渗透率越高，应力敏感性系数越低，应力敏感性越弱，利用初始渗透率与其应力敏感性系数之间的经验公式可以估算煤岩应力敏感性，方便现场应用；储层气体压力越低，渗透率越高，越有利于煤层气开发，而煤岩应力敏感性系数和渗透率伤害系数也略高，需预防应力敏感性造成的渗透率伤害。
- 煤层气 /
- 应力敏感性 /
- 渗透率伤害系数 /
- 影响因素 /
- 实验研究
Abstract: The stress sensitivity of coalbed methane reservoirs is strong, which has an important influence on the development of coalbed methane. Natural coal samples from different blocks were used to carry out stress sensitivity experiments, and two parameters, stress sensitivity coefficient and permeability damage coefficient were applied to evaluate the degree of stress sensitivity of coal samples. The stress sensitivity effects of coal rank, permeability and the gas pressure of a coal reservoir were studied. The results showed that when R_o is lower than 1.7%, the lower the coal rank is, the greater the degree of stress sensitivity is and the higher the extent of the permeability damage. When R_o is higher than 1.7%, the higher the coal rank is, the greater the degree of stress sensitivity is and the higher the permeability damage is. The empirical formula, put forward by this paper, between initial permeability and stress sensitivity coefficient can be used to predict the stress sensitivity coefficient of coal samples, which is convenient for pilot application. The lower the pressure of a gas reservoir is, the higher the permeability, which is advantageous for CBM development. However, lower gas pressure results in a slightly higher stress sensitivity coefficient and permeability damage coefficient, so avoiding stress sensitivity is important.
- coal-bed methane /
- stress sensitivity /
- permeability damage coefficient /
- influencing factor /
- experiment study

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