HWDP drill pipe

The HWDP's uses AISI 4145H alloy structural steel, the technique of production exactly carries on the SY/T5146-1997 standard, HWDP is one kind of medium weight and the drill pipe similar drilling tool, its wall thickness is thicker than the drill pipe, is thinner than the drill collar, on its thick wall body connected special and lengthen drilling joint. Generally adds between the drill pipe and the drill collar, prevents to drilling string's sudden change, reduces drill pipe's weariness; Uses in the directional well, might in compare the low torque in the situation to sneak in high speed, reduces drilling string 's attrition and the breakage. Because its rigidity are less than the drill collar, less contact area with wall of a well , is also not easy to form differential pressure sticking. Dimensions of heavy weight drill pipeSpecifi- cationsoutside diameter Cinside diametertool jointtubesingle qual itymmin formoutside diameterChamfering the shoulder internal and external threadsome guy sizemmincentralEndI type (single length of 9300mm)ZH-JZ55-51/2FH-I139.792.15 1/2FH177.87170.7152.4144.5730ZH-JZ50-NC50-I127.0 76.2NC50(4 1/2IF)168.36 5/8154.0 139.7130.2700ZH-JZ45-NC46-I114.371.4NC46(4IF)158.86 1/4145.3127117.5585ZH-JZ35-NC38-I88.952.4NC38120.74 3/4116.3101.692.1370ZH-JZ29-NC31-I73.0350.8NC31104.84 1/8100.484.181.0 220II type (single length of 13500mm)ZH-JZ50-NC50-II127.0 76.2NC50(4 1/2IF)165.16 1/2154.0 139.7130.2945ZH-JZ45-NC46-II114.371.4NC46(4IF)158.86 1/4145.3127.0 117.5790Note: An overall increase drill pipe and drill collar section modulus section modulus ratio should not exceed 5.5 Mechanical Propertiesyield strength σ0.2tensile σbrlongat ion δ4(%)brinell HBCharpy impact energyALV(J)≥758≥964≥13285∼341≥54