摘要
为了评价应力敏感对微裂缝超低渗透储层渗流的影响,采用微波炉加热方法,制备热应力微裂缝超低渗岩心(钻井取心很难取到微裂缝岩心),近似模拟实际成岩、沉积过程中形成的微裂缝;通过微裂缝岩心的应力敏感性室内实验,进行应力敏感性评价。结果表明:制造的微裂缝能够近似地模拟地层在成岩、沉积过程中形成的微裂缝;微裂缝岩心的渗透率应力敏感滞后程度不明显,应力卸载后渗透率恢复程度高,不存在强应力敏感;对岩石进行应力敏感性评价时,应以地层压力条件下的渗透率为初值,否则会夸大岩石的应力敏感性;在微裂缝低渗透岩心中,随着微裂缝所占导流能力的增加,微裂缝岩心的渗透率滞后恢复程度越高;应力敏感性对微裂缝超低渗储层的产能影响很小。
In order to evaluate the influence of stress sensitivity on the permeability of microfracture ultra-low permeability reservoirs,the thermal stress microfractures in ultra-low permeability cores are made by microwave heating(it is generally difficult to obtain microfracture cores by coring) to approximately simulate the microfractures formed in the deposition and diagenesis process. The stress sensitivity experiments are carried out using the microfracture ultra-low permeability cores. The evaluation results show that: the made microfractures can approximately simulate the microfractures in reservoir rocks. The permeability hysteresis loss of the thermal-stress microfracture cores is little,and the permeability recovery degree is high after the stress is removed. In the evaluation of the stress sensitivity of rocks,the permeability under formation pressure should be as the initial value of permeability,or the stress sensitivity of rocks will be exaggerated. The permeability recovery degree of microfracture ultra-low permeability cores increases with the increasing of the microfracture seepage. The influence of stress sensitivity on the productivity of microfracture ultra-low permeability reservoirs is little.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2015年第1期30-33,37,共5页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家自然科学基金"超低渗透岩石非饱和流体运移机理与相对渗透率数学表征"(编号:51204193)
关键词
微裂缝超低渗透储层
应力敏感性
实验研究
渗透率恢复程度
microfracture ultra-low permeability reservoir
stress sensitivity
experimental study
permeability recovery degree
作者简介
张海勇（1988-），男，博士研究生，主要从事油气田开发方面的研究。E—mail：zhanghmyong2010@sina．cn
