摘要
北部构造带侏罗系阿合组吐格尔明段的速度敏感性实验表现出明显的差异特征,以往伤害机理归咎于储层内的颗粒运移等因素,本次实验从速度敏感性实验的本质仍是在储层产生力的作用这一观点,设计两种不同的实验方式进行分析对比,结合CT扫描、铸体薄片等方法进行微观验证。研究表明:在速度敏感性实验中,TD-1不可逆损害率为48.62%,JE-1不可逆损害率为7.31%,TD-1岩心的无因次渗透率差值逐渐增大,而JE-1岩心的无因次渗透率差值先增大后减小,且在两种不同的应力敏感性实验中可观察出近似的下降趋势;此外,根据最大球孔隙网络提取算法结果发现,在0.40 MPa进口压力下,平均裂缝开度为9.36μm,进口压力增加到7.83 MPa时,平均裂缝开度为5.71μm;分析岩心、岩石薄片、扫描电镜实验数据可知,岩屑组分及晶间孔等因素也是造成速度敏感性损害的主要因素,原因在于这类因素易受到力的作用造成敏感性实验中渗透率发生显著变化现象。
The velocity sensitivity experiment of Tugerming section of the Jurassic Ahe formation in the northern structural belt shows obvious differences.The previous damage mechanism is attributed to the migration of particles in the reservoir and other factors.From the point of view that the essence of velocity sensitivity experiment is still the role of the reservoir in generating force,this experiment designed two different experimental methods for analysis and comparison,combining with CT scanning,casting thin section and so on,microscopic verification was carried out.The results showed that the irreversible damage rate of TD-1 was 48.62%,and that of JE-1 was 7.31%.The dimensionless permeability difference of TD-1 core increased gradually,while that of JE-1 core increased first and then decreased,and the similar decreasing trend was observed in two different stress sensitivity experiments;In addition,according to the results of the maximum spherical pore network extraction algorithm,the average fracture opening was 9.36μm at the inlet pressure of 0.40 MPa,and 5.71μm when the inlet pressure increased to 7.83 MPa;According to the analysis of the experimental data of core,rock slice and SEM,it was seen that the components of rock cuttings and intercrystalline pores were also the main factors that caused the damage of velocity sensitivity.The reason was that these factors were easy to be affected by the force,resulting in the significant change of permeability in the sensitivity experiment.
作者
李鑫羽
欧阳传湘
曹杰
赵鸿楠
曾羽佳
LI Xin-yu;OU-YANG Chuan-xiang;CAO Jie;ZHAO Hong-nan;ZENG Yu-jia(College of Petroleum Engineering,Yangtze University,Wuhan Hubei 430100,China)
出处
《辽宁化工》
CAS
2021年第10期1518-1522,共5页
Liaoning Chemical Industry
基金
国家自然科学基金青年科学基金项目(项目编号:51804039)。
关键词
速度敏感性
微粒运移
晶间孔
岩屑组
Tight sandstone reservoir
Velocity sensitive
Particle migration
Intercrystal pore
Detritus
