Analysis on Corrosion Failure of Aluminum Alloy Drill Pipe for Scientific Ultra-deep Well Drilling

Abstract:

In view of the service conditions of aluminum drill pipe in complex ultra-deep well drilling engineering, the main external drilling engineering factors of the corrosion behavior of aluminum alloy drill pipe are analyzed, the test and analysis on corrosion degree of the aluminum drill pipe engineering sample of Songke-2 well in the project of deep drilling of resources and environment in Songliao basin. The results show that the structure of drill pipe, wear and stress, drilling fluid medium as well as high temperature and high pressure are the main factors of corrosion; the corrosion at the connection point of aluminum rod and steel joint is the most serious and the aluminum rod body is the next; the corrosion resistance of pipe upsetting end is the best, the main components of the corrosion products are Al2O3 and Al (OH)3 phase.