第34卷第4期 2017年7月
钻井液与
完井液
DRILLINGFLUID&COMPLETIONFLUID
doi: 10.3969/j.issn.1001-5620.2017.04.022
注入气体提高砂岩储层酸化效果
刘义刚1，张璐1，张丽平「，邹剑1，张云鹏2，高尚
刘文刚，
张势
LIU Yigang Driling Flerdd &
摘要著爽好于注入酸化育代改者
关链词
中图分类号：
张朋斗 ZHANGI
TE357.2
Vol. 34 No. 4 July2017
气体提高砂岩储层酸化效果[].钻井液与完井液，2017，34（4）：117-121
ZHANG
2017
文献标识码：
al.Injected gas improves acidification job quality of sandistone reservoirs[]] 117-121
充分著虑砂岩错层气井酸化效果
研究过程中分析了气液交替未伤害及受钻完井液性害男心的体能明显提高被污染岩心的
手改化效果不明显效地提高营规酸化效果
：未污染岩民
1001-5620（2017）04-01
文章编号：
17-05
Injected Gas Improves Acidification Job Quality of Sandstone Reservoirs LIU Yigang', ZHANG Lu', ZHANG Liping', ZOU Jian', ZHANG Yunpeng’, GAO Shang(1. Bohai Research Institute of Petroleum, Tianjin Branch of CNOOC, Tianjin 300459:
2. CNOOC EnerTech-Drilling & Production Co., Tianjin 300452)
且总体上注
Abstract It has been noticed in well acidification operation that the acidification job quality is not satisfactory, the effective period of the acidification job is short, and the acidified area is limited. In well acidification operations, it has been found that the results of acidifying a gas well penetrating sandstone reservoirs are much better than the results of acidifying an oil well penetrating sandstone reservoirs. This observation has been used in designing oil well acidification program to improve the acidification job quality, that is, a gas can be injected with acid into the well in oil well acidification. The mechanisms and advantages of alternated injection of gas and acid are extensively studied in this paper. In laboratory experiment, the acidification results of undamaged cores and cores damaged by completion fluid under 3 gas injection models were studied, and the effects of different injected gases on the acidification results were analyzed. It is considered that gas injected in well acidification clearly improved the acidification job quality of damaged cores, especially when an acidification mode in which prepad gas plus altemated gas and acid injections was used during well acidification. For undamaged cores, the effectiveness of gas injection with acid in well acidification was not satisfactory. It was also found that the effectiveness of injecting CO, was better than that of injecting N, Alternated gas injection with acid in well acidification greatly improves the permeability of the reservoir rocks, and is able to enhance the effectiveness of conventional well acidification job. This technology has a broad development prospect.
Key words Acidification; Injected prepad gas; Alternated gas and acid injection; Damaged core; Undamaged core
现场经验表明，对油气井砂岩储层开展基质酸化表现出不同的效果：油井酸化后随注酸量的增加
渗透率逐步增大，达到一定注酸量后渗透率会出现随注酸量增加而渗透率降低的现象；对气井而言，
基金项目：国家重大专项课题“激油田高效采油工程及配套技术示范”(2016ZX05058003)。
第一作者简介：对文测，1969年生，博士，高级工程师，现主要从事于海上油田采油工程相关技术研究。E-mail：
liuyg@cnooc.com.cn 万方数据