我国油田套管损坏的原因探讨

DISCUSSION ON CAUSES OF CASING FAILURE IN OILFIELDS

张光普 陈继明 张效羽 董事尔 李学忠 刘积松 孙建华 孟令祥

Zhang Xianpu Chen Jiming Zhang Xiaoyu Dong Shier Li Xuezhong Liu Jisong Sun Jianhua Meng Lingxiang

西南石油学院 中原石油勘探局

近年来,我国油田套管损坏速度呈直线上升趋势,有的井不足1年时间,有的井刚完井1个月套管就坏了,给原油生产带来重大损失。套管损坏,一是套管柱设计不合理,特别是在盐岩、泥(页)岩地层,设计载荷偏小;二是不合理的注水,加速了套管的损坏;三是套管柱强度设计本来就不富余,射孔给套管带来一定的损害,加速了套管损坏;四是套管的外腐蚀使套管穿孔造成内腐蚀,腐蚀使套管更易损坏;五是油层出砂、固井质量、套管缺陷等使套管损坏。造成套管损坏的因素很多,具体到每口井必然有一些主要因素,找到主要因素才好采取防范措施。

Casing failure is increasing rapidly in recent years.Some wells,for instance,were found the casing damaged only a year or even a month after completion.It has caused great losses to oilfield’s production.Those causes of casing failure are:1.unreasonable design of casing string(especially in salt bed and mudstone(shale) formation);2.unreasonable water injection;3.casing Perforation;4.corrosion;5.sand problems,cementing quality and casing defect.

10.3969/j.issn.1000-7393.1996.05.002