The casing damage becomes more and more serious in China oilfields, casing inspection technique must be improved quickly.

油田开发后期套管损坏越来越严重，人们希望尽快提高套损检测技术水平。

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Downhole video logging technique captures borehole images by downhole camera and can be applied to well casing inspection, downhole fishing, downhole completion quality inspection, etc.

井下视频成像测井利用井下摄像头获取井眼实时图像信息，可用于套管检测、落物打捞、井下作业质量检查等。

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The multifinger caliper tool string to be used for casing inspection was centralized using the combination of a strong, optimally placed, spring loaded roller and stiff arm centralizers.

用于检查套管尺寸的多触点井径测量工具管串，采用结实的、安放位置经过优化的、弹簧加载的滚子及刚性臂扶正器进行居中。

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