drill pipes used for equipment for gas and oil wells.With the help of such equipment made the ascent and descent into the wellbore rock cutting tool is transmitted to the torque created by the load (axial) on the tool as well as a supply of compressed air or rinse solution to the face.Their production is mainly carried out by the standards GOST № 50278-92.According to this regulation, the product manufactured from steel and formed by a seamless manner have upset ends, which are welded to the locks.
Drilling pipes may have different types of planted portions including the inner, outer, or combined landing (denoted RO, Mo or PC, respectively).Articles of PX produced with nominal outside diameter of 73 to 101.6 mm, wall thickness from 8.4 to 11.4 mm, the mass per meter of a smooth tube ranges from about 14 to 22 kg.
diameters of drill pipe class PCs reach face value of 139.7 mm (minimum value is 114.3 mm).A pipe with an outer landing (Mo) have a smaller nominal diameter according to the above reviews (127 mm).In addition to the diameter, for nominal pipe considered parameters such as the diameter of the lock (manufactured in accordance with GOST 27834) and the diameter of the weld joint, including the interior and the diameter of a grain elevator.Another important parameter is the length of which is represented by three groups: from 5.9 meters to 6.3 from 8 to 8.6 m and from 11.9 to 12.5 meters.Modern pipe production allow both large and smaller length, but in this case they do not fit the established standards.
quality drill pipe must be made so that their surfaces are not cracked, bundles, shells and other defects.Correcting these flaws can only be along the axis of the tube, thus sealing, and welding zachekanka problem areas are not allowed, they can only clean up or cut down.
production of drill pipes is organized so that the mass fraction of phosphorus and sulfur in each smelting was under careful supervision.If a company uses a third-party materials, the manufacturer of the required documents according to the quality.Today, some companies produce products with an inner coating (for example, TC-34R), which helps protect the pipe from corrosion Abrasive wear, corrosion rack, reducing the likelihood of fatigue failure and hydraulic losses while drilling.The coating surface is applied to the powder method and allows the pipe to withstand more than 500 hours in temperatures of more than 150C to obtain impact of more than 8 J at the temperature of 20 C and others.
Drill pipes are known as the equipment, which often breaks down due to wear diameter of the castle (outdoor up60% of all cases).At the same time the rest of the pipes are suitable for operation.Recently, to solve this problem, methods practiced carbide hardfacing locks.This prevents cracks formed under high tension and other factors, extreme exploitation.
