郭肖,朱争,高涛,张梦黎,刘川琦
GUO Xiao,ZHU Zheng,GAO Tao,ZHANG Mengli,LIU Chuanqi

• 1:西南石油大学油气藏地质及开发工程国家重点实验室
• 2:陕西延长石油(集团)有限责任公司研究院

摘要(Abstract)：

应用热应力理论,从理论角度分析温度对岩石的作用,推导出渗透率随温度变化的理论模型,再结合变围压、变内压法应力敏感实验进行验证,采用应力敏感评价方法,着重分析温度对低渗储层应力敏感性的影响。研究表明理论模型和实验具有一致性,低渗透储层渗透率随温度呈现负指数递减规律。变围压法和变内压法实验均表明:实验温度在60℃之下,渗透率下降缓慢;但当实验温度超过60℃时,渗透率快速下降,变围压法渗透率降低22.2%,变内压法渗透率降低18.5%。通过应力敏感评价方法分析,储层应力敏感性随温度变化呈现较好的递增规律。对于变围压法,20℃应力敏感损害程度0.57,而80℃应力敏感损害程度递增为0.71,岩样呈现强应力敏感;对于变内压法,20℃应力敏感损害程度为0.36,80℃应力敏感损害程度达到0.52,岩样呈现中等偏强应力敏感。
By means of the thermal stress theory,the roles of the temperature on the rocks are analyzed;the theoretical model is deduced for the changes of the permeability with the temperature.And moreover with the help of the verification by the experiments of changing confining pressure and pore pressure respectively,the influences of the temperature on the stress sensitivity in the low-permeability reservoirs are analyzed by the stress sensitivity evaluating methods.The study shows that the theoretical model is consistent with the experimental findings,the exponential decrease is represented for the permeability with the temperature in the low-permeability reservoirs.The experiments show that under the condition of the experimental temperature(below 60 ℃),the permeability decreases slowly,but when the experimental temperature rises over 60 ℃,the permeability declines rapidly,the reduction is22.2%in the experiment of changing the confining pressure,while the reduction is 18.5%in the experiment of changing the pore pressure.For the former method,the stress sensitivity damage degree at 20 X is 57%,while at80 ℃the degree is up to 71%,thus the strong stress sensitivity of the rock samples is demonstrated;for the later,the damage degree at 20℃ is 36%,while at 80 X the degree reaches 52%,the medium and strong stress sensitivities are presented for the rock samples.

关键词(KeyWords)： 应力敏感;温度;理论模型;低渗透;实验
stress sensitivity;temperature;theoretical model;low permeability;experiment

Abstract:

Keywords:

基金项目(Foundation): “十二五”国家油气重大专项专题(2011ZX05015-002)

作者(Author): 郭肖,朱争,高涛,张梦黎,刘川琦
GUO Xiao,ZHU Zheng,GAO Tao,ZHANG Mengli,LIU Chuanqi

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