低渗透储层应力敏感实验研究及应用  

Research and application of stress sensitive experiment on low permeable reservior

作　　者：杨彬[1] 侯大力[1] 龙刚[2] 任超群[1] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石化西南油气分公司工程技术研究院,四川德阳618000

出　　处：《油气藏评价与开发》2012年第5期41-45,共5页Petroleum Reservoir Evaluation and Development

摘　　要：国内外对上覆岩层压力作用下岩心渗透率的研究十分重视,有必要基于室内实验,研究上覆岩层压力对岩心渗透率的影响。实验表明,岩心的气体渗透率是净有效覆盖压力的函数。随净有效覆盖压力的增加,气体渗透率逐渐变小,而且岩心的气体渗透率是不可逆的,从最大的净有效覆盖压力下逐次降压,渗透率逐渐变大,到一定大时出现滞后现象,但不能恢复到原始渗透率。在考虑应力敏感的情况下,对低渗储层进行了产能计算,结果表明,实际地层条件下计算的气井绝对无阻流量大于实验室条件下计算的绝对无阻流量,并且在相同井底流压下的气井产量也是实际地层的更大。Researches on core permeability under overburden pressure are attached importance to nowadays at home and abroad. It is necessary to study the impact of under overburden pressure on the core permeability based on laboratory experiments. The re- sults of these experiments indicate that the core gas permeability is the function of net effective overburden pressure. The gas per- meability reduces gradually along with the increasing net effective overburden pressure. And the change of the gas permeability is irreversible. Net effective overburden pressure drops from the max. Meanwhile, the gas permeability increases. When the gas per- meability reaches a certain value, the hysteresis phenomena will appear. But the gas permeability cannot return to the original. In consideration of the stress sensitive, the capacity of low permeable reservoir was calculated. The result indicated that the AOF po- tential of gas well in actual formation condition was higher than that in lab conditions. And the gas well in actual formation condi- tion also had higher production under the same well bottom flowing pressure.

关 键 词：低渗岩心 渗透率 净上覆岩层压力 应力敏感 损害率 产能 

分 类 号：TE122.2[石油与天然气工程—油气勘探]