Comparative Analysis of Friction and Wear Properties of Titanium Alloy Drill Pipe and Steel Drill Pipe

Abstract

During the drilling process of complex structural wells such as horizontal wells, the wear, and tear of the drill pipe can lead to its weakened strength, which is one of the important reasons for the damage accidents of the drill pipe. Titanium alloy drill pipes are widely used in major oil fields as a new type of lightweight drill pipe with high fatigue life. To compare the wear performance of titanium alloy drill pipe with wear-resistant zones and traditional S135 steel drill pipe, this article tested and analyzed the chemical composition, hardness, and metallographic structure of these two drill rod materials and established models for these two materials. In the experiment, the wear morphology and wear rate before and after the experiment were analyzed and compared. Finally, based on the experimental results, an in-depth analysis was conducted on the wear mechanism of the drill pipe, and anti-wear measures were proposed. The results show that the hardness of the two materials decreases from the wear-resistant belt to the inner wall, and the microhardness of the S135 drill pipe is about half of that of titanium alloy drill pipe with wear-resistant belt drill pipe; the wear test shows that the wear loss of the S135 drill pipe is 0.1667 g, the wear rate is 0.042 g/h; through measurement, it was found that the wear loss of titanium alloy drill pipe reached 0.0055 g, and the wear rate is 0.0063 g/h. The wear rate of S135 steel drill pipe under the same conditions is 6.7 times that of titanium alloy drill pipe. Through analysis, it is shown that under the same conditions, titanium alloy wear-resistant belts have excellent wear resistance, which can effectively protect the inner matrix and prevent excessive wear of drill pipes. The research results of this article can provide theoretical references for the on-site use of titanium alloy drill pipe and experimental research on drilling tool wear resistance.