Abstract
Influence of high-density drilling fluid weighted with conventional barite, micronized barite, hematite and manganese tetroxide on the wear behavior of N80 metal surface was investigated. The worn surface morphologies and roughness of the N80 metal was observed and tested respectively by scanning electron microscope and surface roughness meter tester. The wear mechanisms of different weighting materials were also discussed. It was found that the erosion rate of N80 steel worn by micronized barite is 57.8% of it worn by conventional barite, and the erosion rate of N80 steel worn by manganese tetroxide is 43.8% of it worn by hematite. The main wear mechanism of conventional barite, micronized barite, hematite and manganese tetroxide on the metal surface is abrasive wear, plowing, planning action and surface fatigue wear, under conditions of high density drilling fluid. Manganese tetroxide and micronized barite can significantly reduce the wear on the metal surface because of filling and adsorption on the concave and convex of the metal surface, especially the roughness of N80 steel surface worn by manganese tetroxide can be reduced to 50% of the hematite.
Highlights
Casing wear is related to drilling fluid, dogleg severity, contact force between drill pipe and casing, and casing steel grade
The results show that the casing wear depth increases with the increase of dogleg angle, but decreases with the increase of drilling fluid density [6]
This paper reviews the influence of high-density drilling fluid with conventional barite, micronized barite, hematite and manganese tetroxide on the wear behavior of N80 metal surface
Summary
Casing wear is related to drilling fluid, dogleg severity, contact force between drill pipe and casing, and casing steel grade. Liang used different steel grade casings to be tested in drilling fluids with different densities. It was found that with the increasing of drilling fluid density, the casing wear rate decreased quickly and increasing gradually [5]. The results show that the casing wear depth increases with the increase of dogleg angle, but decreases with the increase of drilling fluid density [6]. Micronized barite and manganese tetroxide has become more and more popular weighting material for high density drilling fluid. The study of micronized barite and manganese tetroxide on drilling tools and casings are less [7,8]. This paper reviews the influence of high-density drilling fluid with conventional barite, micronized barite, hematite and manganese tetroxide on the wear behavior of N80 metal surface. The wear mechanism of four weighting materials on metal surface will be discussed
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