Title

Study on the Mechanism of O il W e ll Casing
Collapse Caused by Injec tingWa ter w ith H igh Pressure

作者

许涛1 殷桂琴1 张公社1 许占恒2 于宏超3 李振龙4

Authors

Xu Tao, Yin Guiqin,Zhang Gongshe et a.l

单位

1. 长江大学石油工程学院, 湖北荆州434023; 2. 胜利油田分公司河口采油厂, 山东东营257200;

3. 长庆油田分公司第五采油厂, 陕西西安710021; 4. 华北油田分公司采油工艺研究院, 河北任丘062552

Organization

( School of Petro leum Engineer ing, Yangtze
University, Jingzhou 434023, China ),

摘要

高压注水开采, 在多孔介质中形成渗流场, 使钻井后储层的固体骨架应力重新分

布, 通过有效应力改变储层岩体的渗流参数, 影响渗流场与岩体应力场两者的平衡。高围压下

的井眼附近容易产生应力集中和塑性屈服, 储层经过上述流固耦合作用后, 由于储层多为砂

岩、泥岩等不同岩性、不同厚度岩层相互分层夹杂, 各层间力学参数对注水干扰和应力重新分

布的敏感性都有较大差异, 井眼作为唯一较大的储层应力和位移释放的空间, 周围储层产生的

应力重新分布结果会直接对套管、固井水泥环和周围储层岩体这一组合体系产生弹塑性应力

作用, 产生新的应力集中, 并伴随各部位应变的差异, 从而导致套管破坏。

Abstract

The po rous flow and the stress distributing of the rock
body in o il reservo ir is changed afte r the h igh pressure o f
injecting w ate r, the param ete rs are changed at the sam e tim e
w ith the chang ing of the e ffectiv e stress wh ich can affect the
ba lance o f the po rous fie ld and stress field. The p lastic y ield
and stress concen trating often com e into be ing near the w el-l
bore unde r h igh w a l-l rock pressure. To the po int of the
injection and the stress re-distr ibution a fter the flu id-so lid
coup ling interaction, them echan ica l param eters in the Layers
are quite d iffe rent from the much am ount o f sandstone and
mudstone in o il rese rvo irw ith different th ickness and qua lity.
The we ll ho le is the on ly b ig room in the reservo ir fo r the
stress and displacem en t release where the stress d istribution
w illm ake the casing pipe-cem ent sheath- rock m ass system in
the we ll eng ender new stress d istr ibu tion and stra in
d ifference, then causing the casing dam age.

关键词：

套管注水套损机理高压;

Keywords:

Cas ing, W ater injecting, M echan ism,
H igh pressure.;

基金项目

DOI

高压注水引起套损的机理研究