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Advantages of non-magnetic drill pipe

发布时间：

2022-04-07

The non-magnetic drill pipe is mainly used in the horizontal directional drilling system of the coal mine tunnel. Compared with the non-magnetic drill pipe made of beryllium copper, the advantages of the special alloy non-magnetic drill pipe are as follows:

(1) Non-magnetic: It has the characteristics of non-magnetic. Under the condition of 20 Oersted, its permeability is 1.00005-1.0001 H/m, and it will not be magnetized in a strong magnetic field;

(2) Low density: the density is 4.5×103 kg/m3, which is 98% lower than that of beryllium copper;

(3) Low elastic modulus: the elastic modulus of beryllium copper is 1.35×105 MPa, while the elastic modulus of this alloy is 1.17×105 MPa, and beryllium copper is 1.15 times that of this alloy;

(4) High strength-to-mass ratio: the yield strength of this alloy is 840MPa, and its strength-to-mass ratio is 1.8 times that of beryllium copper;

(5) Good plasticity: the elongation at break is 2 to 5 times that of beryllium copper, which can reach the level of 120 steel grade;

(6) Corrosion resistance: It has anti-corrosion resistance and adaptability to the underground environment, and can operate in an acidic and highly corrosive environment of hydrogen sulfide, and its corrosion resistance is better than that of beryllium copper;

(7) Corrosion fatigue resistance: This alloy does not suffer from corrosion fatigue, and its fatigue properties in the drilling fluid environment are the same as in air, and its corrosion fatigue resistance is better than beryllium copper.