Implementation Scheme Analysis and Experience Summary of Offshore Workover Rig Modification Project

In general design,the offshore workover rig is a kind of movable modular structure and thus could be used in different platforms.The original K400 workover rig on Bohai CB-B platform of CNOOC was discarded as useless,so a new heavy workover rig HXJ180MB was installed on the CB-B platform.Because the wellhead zone layout and interface designs of platform had different features,the adaptive modification of the workover rig was complicated.This article summarizes the characteristics and solutions of such project by analyzing the implementation scheme of installing HXJ180MB movable workover rig on the CB-B platform.Because this modification project covered all the adaption or modification work on rig and platform and was typical,it could be an example for similar projects.