company news about Precautions for the use of double-wall drill pipe

Double-wall drill pipe reverse circulation drilling technology is a new type of drilling technology developed on the basis of double-wall drill pipe. Drilling fluid is pumped into the well from the double-wall drill pipe, and cuttings are carried from the inner drill pipe to clean the bottom of the hole. Return to the surface to realize closed-loop circulation of drilling fluid.

Initially, in order to solve the problem related to wellbore cleaning in drilling, the double-arm drill pipe reverse circulation drilling technology was proposed. Since the establishment of the double-wall drill pipe reverse circulation drilling technology in 2004, Statoil and the Norwegian Scientific Research Committee have carried out theoretical research, development and testing of supporting equipment. In 2005, the feasibility of the double-wall drill pipe reverse circulation drilling technology has been carried out. analysis and research. In 2006, the research and development and testing of key supporting equipment were completed. In the same year, Shell also joined the research on this technology; in 2007, the full-size "pull drill" test bench was tested; In 2009, the pilot well was successfully drilled onshore and offshore; in 2013, the double wall was launched at the off-site trade fair. Drill pipe reverse circulation for riserless drilling. Double-wall drill pipe reverse circulation drilling technology has great advantages in controlled pressure drilling, large displacement drilling, deep water drilling, and pressure layered formation drilling.

When drilling with double wall drill pipe, special drill bits must be used. Most of the existing drilling rigs have a split structure composed of an inner tube and an outer tube. The structure has the advantages of low processing difficulty and low manufacturing cost, but has poor structural strength. The shortcomings are also very prominent in the prior art. There is also a steel body drill bit in the prior art. It is an integrated structure and has excellent structural strength, but the production cost of the drill bit is high, and the construction cost is increased. In addition, the drilling rig can only rely on a single cycle of drilling fluid to remove chips, and the bottom hole can be removed. The pressure difference is large and the chip removal ability is poor.