基于压力振荡法的致密储层损害评价方法及应用研究  

Research on damage evaluation method and application of tight reservoir based on pressure oscillation method

作　　者：郑晓斌 苏延辉 耿学礼 史斌 ZHENG Xiaobin;SU Yanhui;GENG Xueli;SHI Bin(Engineering Technology Branch of CNOOC Energy Development Co.,Ltd.,Tianjin 300452,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《精细石油化工进展》2024年第4期17-22,共6页Advances in Fine Petrochemicals

摘　　要：页岩气、煤层气、致密气等致密储层具有孔渗极低、渗流过程不完全遵循达西定律的特点,传统的储层损害评价方法在时效性、准确性等方面存在诸多局限性。为研究适合致密储层的损害评价方法,从测试原理上对比了稳态法、压力脉冲法、压力振荡法等评价方法,优选压力振荡法。以压力振荡法为基础,试制了一套集合工作液污染、渗透率测试、敏感性分析等功能的致密储层损害模拟评价设备,并针对煤层气、致密气的储层进行储层敏感性评价、工作液对致密储层的损害程度评价。室内实验表明:该方法在实验准确性和时效性上具有一定优势。现场应用结果表明:优选的工作液体系在现场应用良好。Dense reservoirs such as shale gas,coalbed gas and tight gas are characterized by extremely low porosity and permeability and incomplete compliance with Darcy’s law in seepage process.Traditional reser⁃voir damage assessment methods have many limitations in terms of timeliness and accuracy.In order to study the damage evaluation method suitable for tight reservoir,the steady state method,pressure pulse method and pressure oscillation method were compared from the test principle,and pressure oscillation method was select⁃ed as the best method for damage evaluation of tight reservoirs.Based on the pressure oscillation method,a set of simulation and evaluation equipment for dense reservoir damage with the functions of aggregate working flu⁃id pollution,permeability test and sensitivity analysis had been developed.Reservoir sensitivity evaluation and damage degree evaluation of working fluid to tight gas reservoirs were carried out for coalbed methane and tight gas reservoirs.Laboratory experiments showed that this method had certain advantages in experimental accura⁃cy and timeliness.The field application results showed that the optimized working fluid system was well ap⁃plied in the field.

关 键 词：压力振荡法 致密储层 储层损害 渗透率 储层敏感性 

分 类 号：TE258[石油与天然气工程—油气井工程]