Research and application of efficient milling process for surface casing

Abstract

In order to solve the problems in the surface casing removal, the casing milling process is proposed to be used. Through the size and material selection of casing milling pipe, mechanical analysis of connection thread and the innovative design of casing milling shoes, a series of casing milling tools and the efficient casing milling process are formed. The field application results show that the milling process can smoothly mill to the predetermined position. After the milling process, the surface casings can be successfully removed by cutting and fishing. The efficient milling process studied in this paper can make the removal of the surface casing with low cast and high efficiency. Both social and economic benefits are remarkable and it has a broad application prospect.