Drill pipe specification diversification, according to the different main sulfur resistant drill pipe, drill aluminum, titanium drill pipe, drill ultra-high strength steel, carbon fiber composite drill pipe, the drill pipe material of Kevlar material, etc. . Lightweight, thin-walled drill ultra-high strength steels can be used to solve large displacement wells, deep and ultra-deep water drilling drilling problems. However, due to the high strength steel brittle at low temperatures and is difficult to achieve a balance between impact toughness and tensile strength, but recently, GrantPrideco developed ultra-high-strength steel drill UD- 165 (VM- 165 ultra high strength steel ), its unique heat treatment process makes the drill not only meet but also to meet the requirements of the yield strength and toughness requirements. UD- 165 steel drill comparative strength of gravity Increasing the S- 135 22%, second only to the titanium drill; UD- 165 steel drill superior strength of gravity than aluminum drill pipe; As a result of thin-walled structure makes Hydraulic performance is superior to aluminum and titanium drill pipe, which is especially important for large displacements and deep wells.