Device and method for measuring well wall hole size by using parallel light ruler

The invention belongs to the technical field of oil well logging, and particularly relates to a device and method for measuring a well wall hole size by using a parallel light ruler. According to the technical scheme, the device for measuring the well wall hole size by using the parallel light ruler is characterized by comprising an underground tool unit, the other end of the underground tool unit is rotationally connected with a measuring light ruler short section, a lens is installed on the measuring light ruler short section, four point light sources are arranged around the lens of the measuring light ruler short section, light rays of the four point light sources are parallel to one another, the four point light sources project light spots on a well wall, and a pattern defined by the four light spots is a measuring light ruler. The invention provides the device and method for measuring the well wall hole size by using the parallel light ruler. 本发明属于石油测井技术领域，具体涉及一种利用平行光尺测量井壁孔眼尺寸的装置及方法。其技术方案为：一种利用平行光尺测量井壁孔眼