CL区块登娄库组致密砂岩气藏压裂液体系适应性评价  

Evaluation of Adaptability of Fracturing Fluid System for Tight Sandstone Gas Reservoirs in the Denglouku Formation of CL Block

作　　者：肖杭州[1] Xiao Hangzhou(PetroChina Jilin Oilfield Company,Songyuan,Jilin 138000,China)

机构地区：[1]中国石油吉林油田分公司,吉林松原138000

出　　处：《特种油气藏》2023年第3期143-147,共5页Special Oil & Gas Reservoirs

基　　金：中国石油吉林油田分公司科技重大专项“压裂关键技术攻关与现场试验”(JY21A2-12)。

摘　　要：为进一步开展压裂液及支撑剂对CL区块登娄库组致密砂岩储层的适应性评价工作,选取目标层位常用的压裂液及支撑剂,开展了岩心渗透率测试实验、返排实验、CT重构实验及储层导流能力实验等,综合评价了不同类型压裂液和支撑剂对岩样渗流能力的影响。研究表明:压裂液返排后对岩心仍存在一定损害,胍胶压裂液的损害率大于滑溜水压裂液,主要表现为水敏损害、水锁损害及残渣损害,其机理在于胍胶压裂液处理后的岩样孔隙结构发生显著变化,孔喉半径为7~22μm的微小孔隙占比增多;致密砂岩储层渗流能力受支撑剂嵌入影响,导流能力与粒径及闭合压力呈负相关。该研究成果可为CL区块登娄库组致密砂岩气藏压裂液体系优选提供理论指导。To further evaluate the adaptability of fracturing fluid and proppant to the dense sandstone reservoir in the Denglouku Formation of CL block,the commonly used fracturing fluid and proppant in the target formation were selected for core permeability testing experiments,flowback experiments,CT reconstruction experiments and reservoir conductivity experiments to comprehensively evaluate the effects of different types of fracturing fluid and proppant on the permeability of rock samples.The study shows that there is still some damage to the core after fracturing fluid flowback,and the damage rate of guar gum fracturing fluid is larger than that of slickwater fracturing fluid,mainly manifested as water-sensitivity damage,water-locking damage and residue damage,and the mechanism is that the pore structure of rock samples treated with guar gum fracturing fluid changes significantly,and the percentage of micropores with pore throat radius of 7-22μm increases;the permeability of dense sandstone reservoir is affected by proppant embedding,and the conductivity is negatively correlated with the particle size and closure pressure.The research results can provide theoretical guidance for the preferential selection of fracturing fluid system for dense sandstone gas reservoirs in Denglouku Formation of CL block.

关 键 词：压裂液 支撑剂 导流能力 致密砂岩 气藏 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]