The 40-arm caliper, that is specially applied to inspect casing deformation, casing opening and casing corrosion, has a broad usage in oil resevior exploraton and develpment.

• 40臂井径仪是专门用于检查套管变形、孔洞和内壁腐蚀的精密仪器。该仪器在油藏勘探和开发过程中的应用是比较广泛的。