用于致密气提高采收率的储集层干化方法  

A reservoir drying method for enhancing recovery of tight gas

作　　者：张烈辉[1] 熊钰[1] 赵玉龙[1] 唐洪明[1] 郭晶晶[1] 贾春生[1] 雷强 王秉合 ZHANG Liehui;XIONG Yu;ZHAO Yulong;TANG Hongming;GUO Jingjing;JIA Chunsheng;LEI Qiang;WANG Binghe(State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Institute of Exploration&Exploitation,PetroChina Yumen Oil Company,Yumen 735019,China)

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,成都610500 [2]中国石油玉门油田公司勘探开发研究院,甘肃玉门735019

出　　处：《石油勘探与开发》2022年第1期125-135,共11页Petroleum Exploration and Development

基　　金：国家自然科学基金重点项目“致密气藏储层干化、提高气体渗流能力的基础研究”(51534006);四川省应用基础研究项目“致密气藏储层无固相残留深度干化技术基础研究”(2019YJ0424)。

摘　　要：基于广义水锁伤害机理及水锁解除方法研究,研制用于提高致密气采收率的干化剂并对其基础性能、注入方式、干化效果进行评价。结合室内实验研制出适用于不同类型致密储集层的干化剂体系,研究了干化剂的化学效应、热效应、抗盐作用、抗盐配方以及干化反应延迟作用机理与方法,测试了超临界CO_(2)对干化剂体系的溶解与增溶特性,提出了干化剂超临界CO_(2)溶解注入方法,分析了超临界CO_(2)与基质微孔中地层水作用机理,对比研究了干化前后储集层微观孔隙结构特征和渗流特征,在建立核磁共振和激光刻蚀模型联合表征方法基础上,定性和定量评价了干化剂对不同产状束缚水的干化效果,采用格子Boltzmann方法评价了干化效应对气体微观渗流能力影响,结合数值模拟方法分析了干化效应等对气井产能及生产动态的影响。研究表明,干化可大幅降低致密储集层含水饱和度,提高井筒附近或压裂缝附近气体渗流能力,可在储集层干化基础上发展新的致密气增采工艺措施。Based on the study of damage mechanisms of generalized water lock and related water lock removal methods,drying agents for enhancing tight gas reservoir recovery were developed,and the basic properties,injection mode and drying effect of the drying agents were evaluated.The chemical effect,thermal effect,salt resistance,salt resistance formulas and delay mechanism of the drying agent systems for different types of tight reservoirs developed through lab experiment were investigated.The solubility and solubilization properties of supercritical carbon dioxide on drying agent systems were tested.The injection mode of dissolving drying agent in supercritical carbon dioxide was proposed.The mechanisms of supercritical carbon dioxide with water in formation matrix micropores were analyzed.Micro-pore structures and seepage characteristics of reservoir before and after drying were compared.Based on the characterization combining NMR and laser etched pore structure model,drying effects of the drying agents on bound water of different occurrences were evaluated qualitatively and quantitatively.Lattice Boltzmann method was used to evaluate the influence of drying effect on gas micro-seepage ability.The influence of drying effect on productivity and production performance of gas well was analyzed by numerical simulation.The drying can greatly reduce water saturation of tight reservoir and improve the seepage capacity of gas near wellbore and fractures.The new measures enhancing recovery of tight gas reservoirs on the basis of reservoir drying could be developed.

关 键 词：致密气 储集层干化 提高采收率 水锁解除 干化剂 渗流能力 

分 类 号：TE312[石油与天然气工程—油气田开发工程]