PROTECTOR CASING HYDRIL511 CLOSED END PIN THREAD PROTECTORS
Casing drilling has changed the operation mode of conventional drilling, synchronizing downhole rock breaking drilling and casing operation, and has the technical characteristics of integration of drilling and completion. It can not only reduce engineering costs, but also reduce downhole complexity and accidents, so it has good development and application prospects. In casing drilling, the stress on the casing string is much more complex than that of ordinary cementing casing, and the working environment is even worse. During drilling, the casing not only bears axial force and external extrusion force