深层致密双重介质气藏应力敏感研究及应用
Study on Stress Sensitivity of Deep Dual Media Tight Gas Reservoir and its Application
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- 引用格式:
-
王海洋,杨胜来,李武广,杨健坤,黄,伟.深层致密双重介质气藏应力敏感研究及应用[J].天然气与石油,2013,31(4):0.doi:
.Study on Stress Sensitivity of Deep Dual Media Tight Gas Reservoir and its Application[J].Natural Gas and Oil,2013,31(4):0.doi:
- DOI:
- 作者:
- 王海洋 杨胜来 李武广 杨健坤 黄 伟
- 作者单位:
- 中国石油大学（北京）石油工程教育部重点实验室
- 关键词:
- 致密气藏；双重介质；应力敏感；产能；动态储量
Tight gas reservoir； Double media； Stress sensitivity； Productivity； Dynamic reserves
- 摘要:
- 随着气藏中的天然气不断被采出和气藏压力的下降，将会产生严重的应力敏感问题，为了研究应力敏感对气藏开发的影响，需要进行室内实验研究。通过定围压变内压和定内压变围压两种方式进行岩心应力敏感评价，在定围压变内压实验中，降内压使岩心渗透率下降的幅度高达30 %~70 %，重新升内压使岩心渗透率值只能恢复到初始值的50 %~80 %。在定内压变围压实验中，升围压可使岩心渗透率下降40 %~80 %，重新降围压使岩心渗透率值仅能恢复到50 %~80 %左右。考虑应力敏感新产能方程和物质平衡方程计算得到的无阻流量及动态储量与普通产能方程和物质平衡方程得到结果存在较大偏差。结果表明，岩心的渗透率越大，其应力敏感就会越强，且对渗透率的伤害不能完全恢复，渗透率与有效应力呈现明显的幂律规律。应力敏感对于深层致密双重介质气藏的产能和动态储量影响也非常大，考虑应力敏感新产能方程和动态储量计算方法对深层致密双重介质气藏的开发具有一定的实用价值。
With continuous natural gas development，reservoir pressure drops gradually and serious reservoir stress sensitivity occurs consequently. In order to study the effect of stress sensitivity on gas reservoir development，it is necessary to conduct laboratory experiment. The core stress sensitivity can be evaluated through reducing the internal pressure and changing the confining pressure. In internal pressure reduction experiment，the initial core permeability can be decreased by 30 %-70 % through internal pressure reduction and the permeability value can be only restored by about 50 %-80 % of the initial value through re-increasing the internal pressure. In the confining pressure change experiment，the core initial permeability can be decreased by 40 %-80 % through confining pressure increase and the permeability value can be only restored by about 50 %-80 % of the initial value through re-decreasing the confining pressure. The open flow capacity and dynamic reserves obtained from the new productivity equation and material balance equation considering stress sensitivity are largely different from those obtained from common ones. The results show that the larger the core permeability is，the stronger the stress sensitivity is. The new productivity equation considering stress sensitivity and dynamic reserves calculation method have a certain practical value for double media gas reservoir development.
