套损检测技术在青海油田的应用

The Casing Damage Detection Technology in Qinghai OilField

青海油田测试公司先后引进SONDEX公司生产的MTT+MIT多臂井径成像测井仪和俄罗斯生产的MID-K多层管柱电磁探伤成像测井仪,针对不同的测井目的优选套损检测测井手段,取得了较好的效果。MTT+MIT套损检测技术在套管变形检测方面主要用于检测套管弯曲变形、错断、缩径等套管物理形变情况,在MTT的辅助作用下,可检测套管腐蚀、穿孔等;MTT+MIT测井前应通井、洗井。若井筒出液,应挂接井温系列,放慢测速(最佳测速为600m/h),可有效识别疑似孔、洞、缝等不易识别的情况;加测MID-K电磁探伤测井进行辅助验证效果会更好。MID-K套损检测技术在套管腐蚀等化学形变检测方面主要用于检测多层套管技术状况、套管变形、腐蚀情况,尤其是识别小直径孔、洞、缝等套损情况效果明显。射孔对套管的影响非常大,有近1/4的变形是在射孔部位。在后期开采中应选择适合油田的套管类型,优化射孔方案,在保证施工成功率的情况下最大限度地保护套管。完成MTT+MIT测井133井次、MID-K测井125井次套损检测测井作业,给出了8个具体实例,为套损修复措施提供了科学依据。

Qinghai Oilfield testing company has introduced SONDEX company＇s MTT ＋ MIT multi arm caliper imaging logging tool and the Russian MID-K multilayer casing string electro- magnetic detection imaging logging instrument. According to different purposes of well logging, casing damage detection technologies are optimized and good results are achieved. The former is used to detect physical deformations of casings, such as buckling, distortion, offset and shrink- age, etc. Also, it may detect casing corrosion and holes. Wells should be drifted and flushed be- fore making MTT＋MIT log. If the wellbore leaks, well temperature log is added, in which the best log speed is 600 m/h, thereby, effectively recognizing suspectable or probable casing holes, seams and fractures. Supplementary MID-K log is added so to get much better detecting results. MID-K tool is used in chemical deformation of casings, such as, multlayer casing state, casing distortion, corrosion, etc. , especially in the small diameter holes and thin fractures. Perforation has serious influence on the casings, about 1/4 distortion is in the perforated locations. In the lat- er oilfield development, we should select suitable casings and optimize perforation schemes to successfully perforate and protect the casings. So far, the MTT＋MIT tool has finished 133 times logs and the MID-K tool has completed 125 times casing damage detections. 8 detection examples provide better scientific proof for the damaged casing maintenance and repair.