Übergangsstück

Crossover sub acts for conversion and connection of drill stem components. It’s used to connect lower drill tools and upper drill tools while the lower connections is not matched with the upper connections. The crossover subs are made from 4145H alloy steel, that are heat-treated according to drill collar specifications to ensure a hardness range of 285-341. Brinell. Charpy “V” notch minimum impact strength of 40 ft-lb at 700F are guaranteed one inch below the surface. It acts as connecting and change-over, deliver torque function in different types of drill tools. All connections are phosphated or coppered coating to minimize galling on initial make-up and drilling operation. Main parameters: ItemDescriptionUpper connectionLower connectionSizeType1Kelly crossover subKellyDrill pipeAll sizeA or B2Drill pipe crossover subDrill pipeDrill pipeAll sizeA or B3Crossover subDrill pipeDrill collarAll sizeA or B4Drill collar Crossover subDrill collarDrill collarAll sizeA or B5Drill Bit crossover subDrill collarDrill bitAll sizeA or B6Swivel crossover subSwivel lower subKellyAll sizeC7Fishing crossover subKellyDrill pipeAll sizeCDrill pipeFishing toolAll sizeCRemarks: Type A: One crossover has one same OD. Type B: One crossover has two sizes OD. Type C: The connection type is left hand type. Specification and Sizes TypeSize (in)Standardσb (MPa)σ0.2 (MPa)δ4 %Akv (J)HBCrossover Sub3 1/8 6 7/8API Spec.7≥965.3≥758≥13--->2857 10≥931≥6893 1/8 7 3/4SY5200-93≥965≥760≥13≥54285 3408 11≥930≥690277 340