摘要
为克服常规自生泡沫强度低、调剖能力有限,针对强非均质性储层无法有效封堵高渗层的难题,提出一种无机凝胶强化自生泡沫体系。利用Waring Blender搅拌机、电子显微镜和双填砂管模型研究了体系的泡沫性能和调剖性能,结果表明:无机凝胶强化自生泡沫体系平均粒径为200μm,析液半衰期达到55.2 min,较常规自生泡沫体系粒径更加细小均匀,稳定性显著增强。常规自生泡沫体系对于渗透率级差为5的并联填砂管模型具有良好的调剖效果,整体采收率可由13%增至30%,但渗透率级差≥10后基本无法动用低渗层;无机凝胶强化自生泡沫体系在不同渗透率级差下都具有良好的调剖效果,渗透率级差≤10时可实现产液率反转,当级差达到15时仍可有效封堵高渗层、启动低渗层,整体采收率可在水驱基础上提高21%。研究结果为在强非均质储层开展自生泡沫调剖提供了参考依据。
Conventional in-situ foams are of poor strength and limited profile control ability,which could not effectively plug the high-permeability layers in highly heterogeneous reservoirs.To solve this problem,in this work,an inorganic gel enhanced in-situ foam system was proposed.The foaming performance and profile control performance of conventional in-situ foam system and inorganic gel enhanced in-situ foam system were both studied by using Waring Blender mixer,electron microscope and double sand-filled tube model.The results showed that,the average particle size of the inorganic gel enhanced in-situ foam system was 200μm,and the drainage half-life reached 55.2 min,which was smaller and more uniform than that of conventional in-situ foam system and exhibited significantly enhanced stability.Conventional in-situ foam system had good profile control effect for parallel sand-filled tube model with permeability ratio of 5,and the overall recovery factor could be increased from 13%to 30%,but low-permeability layers could hardly be used for permeability ratio≥10.In contrast,the inorganic gel enhanced in-situ foam system had good profile control effect at different permeability levels.When the permeability ratio was≤10,the liquid production rate could be reversed.When the permeability ratio reached 15,the high-permeability layer could still be effectively blocked,and the low-permeability layer could be used.The overall recovery factor could be increased by 21%on the basis of water flooding.This work could provide a reference for conducting in-situ foam profile control in highly heterogeneous reservoirs.
作者
康小斌
屈亚宁
马宝鹏
Xiaobin Kang;Yaning Qu;Baopeng Ma(Yanchang Oil Field Co.,Ltd.,Yan’an,Shaanxi 716000,China)
出处
《日用化学工业(中英文)》
北大核心
2025年第4期481-486,共6页
China Surfactant Detergent & Cosmetics
基金
吴起采油厂胜利山低渗透强非均质性储层构型与剩余油挖潜技术对策(ycsy2024cyzc-C-01)。
关键词
非均质油藏
泡沫强度
自生泡沫
调剖
无机凝胶
heterogeneous reservoir
foam strength
in-situ foam
profile control
inorganic gel
