At present, top drive drilling system is widely used in oil drilling because of its advantages of high efficiency, timesaving column drilling, low risk of continuous rotation and circulation, good for well control and high safety. Due to the high price of the cock in the system, the screw thread of the cock can be easily damaged if it is often disassembled, which will lead to drilling accidents and safety accidents.In order to protect the top drive cock, a protective joint is installed in the BHA.

The protective joint is located between the lower end of the top drive safety valve and the upper end of the drill pipe. It is an important auxiliary drilling tool to protect the top drive safety valve.

The mud is required to be filtered in the drilling process. Generally, the drilling fluid filter device is placed at the root of the internal thread of the drill pipe and supported in the drill pipe through the chamfer in the drill pipe.

But for the double step drill pipe buckle with high torsion resistance, there is no chamfering inside to support the filter cartridge, so the filter cartridge cannot be placed. This special protective joint is specially designed to solve this problem.

The protective joint of the safety valve is an integrated structure, and the filter cartridge is directly installed in the protective joint. The structure is simple and compact, with good reliability, convenient operation and use, strong universality and easy maintenance. The application of the top drive safety valve protection joint for oil drilling avoids adding a filter joint between the lower part of the safety joint and the drill pipe for filtering mud, improves the quality of the filtering mud, reduces the drilling risk, prolongs the service life of the top drive safety valve, and reduces the production cost

Technical specifications can be reasonably designed according to customer requirements.