某高压气井13Cr油管挤毁和脱扣原因分析  

Analysis of Cause for Collapse and Pull-over of 13Cr Tubing Used in a Certain High-pressure Gas Well

作　　者：吕拴录[1] 宋洋 熊茂县 马磊[3] 王华[3] 赵密锋[3] 曾努[3] LV Shuanlu;SONG Yang;XIONG Maoxian;MA Lei;WANG Hua;ZHAO Mifeng;ZENG Nu(China University of Petroleum,Beijing 102249,China;Xi'an Maurer Petroleum Engineering Laboratory,Xi'an 710065,China;CNPC Tarim Oil Field Branch,Kuerle 841000,China)

机构地区：[1]中国石油大学,北京102249 [2]西安摩尔石油工程实验室股份有限公司,陕西西安710065 [3]中国石油天然气股份有限公司塔里木油田分公司,新疆库尔勒841000

出　　处：《钢管》2021年第6期61-64,共4页Steel Pipe

摘　　要：分析高压气井13Cr油管发生挤毁和脱扣事故的原因。分析认为:13Cr油管的化学成分和力学性能满足标准要求,但油管在井下发生了应力腐蚀,应力腐蚀裂纹减小了油管的壁厚,降低了油管的抗挤毁强度,而地层出砂导致油管堵塞,使得油管所受外压大于内压,且其内外压差超过该油管剩余壁厚的抗挤毁强度,成油管先发生挤毁后发生脱扣。Investigated here in the article is the cause for the failure of collapse and pull-over of the 13Cr tubing as used in a certain high-pressure gas well.The cause is identified via the investigation as follows.Although the said tubing is up to the requirements as specified under applicable standard in terms of chemical composition and mechanical property,the tubing is subjected to the stress corrosion in the well,and the stress corrosion crack gets the wall thickness of the tubing reduced,and thus collapse resistance of the tubing is reduced too.And in this case,once formation sand production happens,the tubing is blocked,which makes the external pressure borne by the tubing is greater than the internal pressure,and also gets the difference between the external pressure and the internal pressure exceeds the collapse strength of the tubing's remaining wall so as to get the collapse inevitably happens,and then follows the pull-over.

关 键 词：油管 挤毁 脱扣 应力腐蚀 抗挤毁强度 

分 类 号：TE983[石油与天然气工程—石油机械设备]