The linkage arm and single caliper log tools have some disadvantages in higher inclined and horizontal well logging, such as loose contact between arm-pads and borewall, untrue caliper curves, etc.

• 联动的单一井径组合测井仪器在大斜度井和水平井测井施工中暴露出某些缺陷 ,如极板不能贴紧井臂 ,井径曲线失真。