Abstract: Annual workover workload in offshore oil fields continues to increase. There are complex problems underground,such as string corrosion,scaling,casing deformation,and screen breakage. With the underground situation remaining unknown,it often leads to weak program,and “empty drilling” often occurs. On the basis of the existing downhole visual tools,the development of supporting tools for storage downhole visual equipment is carried out,and a set of storage downhole visual system is designed,so that the visual tools can be inserted into the well with the pipe string,and the washing fluid can be circulated underground,so as to achieve a clear record of downhole conditions and assist the analysis and judgment of well conditions,so as to improve the success rate of the workover plan and the operation efficiency.

Key words: offshore oil fields, storage type, downhole visual tools, tool development