稠油热采井注汽及油层出砂对套管的影响  

Influence of steam injection and sand production on casing in heavy oil thermal recovery wells

作　　者：姜泽菊[1] 安申法[1] 赵延茹[1] 翟勇[1] 于彦[2] 周化彬[3] 

机构地区：[1]胜利油田有限公司采油工艺研究院 [2]胜利油田有限公司孤岛采油厂 [3]胜利油田有限公司胜利采油厂

出　　处：《石油机械》2005年第7期17-20,92,共4页China Petroleum Machinery

基　　金：中石化集团公司2000年立项课题"稠油热采井套损机理及预防技术"研究的内容。

摘　　要：对胜利油田单二区块稠油热采井注汽及油层出砂进行了有限元数值模拟研究,得出如下结论:(1)油层注汽引起岩层温度升高,套管应力增加,易造成套管轴线偏离,发生错断;(2)热采井出砂严重时,出砂区域地层软化,地层骨架失去承载能力,出砂区域内套管轴向应力为压应力,当超过极限应力时,易发生套管弯曲变形、错断和缩径;(3)随着出砂量的增大,套管射孔孔眼应力集中系数增大,当孔边应力达到套管材料的屈服极限时,会导致孔眼塑性破坏。A finite element numerical simulation investigation is made in the steam injection and sand production of the thermal recovery wells in Dan 2 block in Shengli Oil Field. Conclusions are drawn as follows: (1) steam injection causes rise of formation temperature and increase of casing stress, resulting in casing breakage; (2) While serious sand problem occurs, the formation in the sand entry area is softened, therefore the axial stress on the casing is actually a press stress, and when this stress becomes higher than the stress limit, the deformation, bending and shrinking of the casing occur; (3)With the increase of the sand production rate, the stress concentration coefficient at the perforating tunnel increases, and when the stress at the perforation edges reaches the yielding limit of the casing material, plastic damage of the perforation may occur.

关 键 词：稠油热采井 油层出砂 注汽 数值模拟研究 应力集中系数 胜利油田 温度升高 套管应力 区域地层 承载能力 轴向应力 极限应力 弯曲变形 射孔孔眼 孔边应力 塑性破坏 有限元 压应力 内套管 出砂量 管材料 错断 增大 区块 

分 类 号：TE358.1[石油与天然气工程—油气田开发工程] TE345