公开(公告)号：US20190085684A1

公开(公告)日：2019-03-21

申请号：US15970490

申请日：2018-05-03

Applicant: SOUTHERN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xinding FANG ,  Jianxia XU ,  Zhentao YANG

IPC: E21B47/09 ,  E21B47/08 ,  G01V1/52 ,  G06F17/18 ,  G06F17/11

Abstract: A method, device, terminal and computer readable storage medium for determining a cross-sectional shape of a borehole involves obtaining a plurality of logging data items as measured at a same depth of a well via a multi-arm caliper. The logging data items include pad coordinates which use a center of the multi-arm caliper as a reference point. Coordinates of a borehole center and a borehole radius at the depth of the well are obtained by using a least squares objective function with a constraint condition and according to the pad coordinates. The constraint condition is that a distance from a pad of a caliper tool to the borehole center is larger than or equal to the borehole radius. The pad positions are located outside a circle or on the circle obtained by fitting according to the least squares objective function, such that a real borehole cross-sectional shape is obtained. Measuring errors of well logging are reduced, and the reliability of the measurement of the borehole cross-sectional shape is improved.