SU866114A1 - Drill string - Google Patents

Description

(54) DRILL PIPE COLUMN

I

This invention relates to a device for protecting a drill string and may be used in the oil and gas industry.

Known columns of drill pipe, including wear-resistant ski, welded on the outer cylindrical and end surface of the castle

The disadvantage of the design lies in the difficulty of restoring the end surface of the support step, on which the pipe string rests upon landing on the elevator, when it is worn, as the thermal effect of the chuck leads to additional stress concentrators.

The known string of drill pipe, comprising an element installed in the annular groove of the coupling of the drill string L2JI

However, the known column has insufficient strength, since loosening the outer surface of the lock coupling in a dangerous section, the protective sleeve must be loosened by additional units, a significant increase in the diameter of the lock, as well as a thin-walled protective sleeve may lead to breakage and fall into the wellbore.

The purpose of the invention is to improve the reliability of the column while increasing its fatigue strength.

This goal is achieved by the fact that the groove under the protective element is made in front of the end surface of the lock-up clutch.

Moreover, the protective element can be made in the form of a split ring.

In addition, an elastic element, such as a spring, can be placed between the protective element and the bearing surface of the lock-up clutch.

Claims (2)

And also the fact that the protective element is bimetallic. 3 In FIG. 1 shows a drill string turbo; in fig. 2 — node 1 in FIG. 3 shows section A-A in FIG. one; in fig. 4 shows an embodiment of a drill pipe string with elastic inserts; in fig. 5 - installation of the protective element with elastic inserts; in fig. 6 shows an embodiment of a security element for operation with a conical elevator; in fig. 7 is a variant of mounting the security element for operation with a conic elevator. The drill pipe string includes a pipe 1, on a cylindrical thickened surface of which directly in front of the supporting end surface of the lock coupling 3 there is an annular straight point 4 having a rounded profile in which a protective element 5 is installed, made for example in the form of a back ring having a wear-resistant outer cylindrical surface 6 and end support surface 7. For a quick change, the ring can be made detachable from two halves, mounted with screws 8 with an internal hexagon and locking pins 9, C mind When loading the drill string to the elevator between the protective element and the supporting end surface of the lock coupling, an elastic element such as a belleville springs 10 can be mounted. The outer surface of the protective element can be made flush with the outer surface of the lock, or protrude above this by the surface. The protective element can be made from one or from different material compositions with different processing. In order to provide the necessary hardness of its surface with the provision of a viscous core to prevent splitting and the formation of cracks from impacts, the protective element can be made bimetallic, have weld-resistant, extruded or otherwise wear-resistant surfaces 6 and 7, or be made of cemented steels, etc. For working with various types of elevators, for example, conical electric heaters, the outer surface of the protective elements can be made conical. 44 During the lifting operation of the drill string, the bearing surfaces of the security element interact with the elements of the elevator. At the same time, the placement of the protective element in the groove directly in front of the supporting end of the lock outs of the lock provides reliable protection against wear at the same time of both the cylindrical surface of the lock and its stop end. The implementation of the protective element in the form of a split ring simplifies the work associated with the replacement of a worn protective element, and also provides a quick replacement of the rings of one form for another if it is necessary to replace the elevator. The placement of the elastic element between the protective element and the supporting end surface of the 3aMKai coupling ensures damping of shock loads without reducing the rigidity and strength of the drill string. When the drill string is working in the well, the protective element ensures its reliable protection from wear due to contact with the well walls of the wear-resistant outer cylindrical surface 6. At the same time, the protective element is installed in the groove in front of the supporting end surface of the lock coupling, i.e. in place of a sharp transition stiffness. Where the failure rate of welded and all-metal drill pipes is greatest, the operation of the drill string is ensured by increasing its fatigue strength. Claim 1. Column of drill pipe, including connecting sleeves and a protective element installed in the annular flow of the drill pipe, with the aim of increasing reliability. columns while increasing its fatigue strength and ring groove made before the bearing end surface of the lock coupling. 2. The column according to claim 1, in which the protective element is designed as a split ring. 3. Column on PP. 1-2, that is, it is provided with elastic inserts, for example Kharelchaty springs, which are installed first between the protective element and the supporting end surface of the lining locks 4. Column in PP. 1-2, this is due to the fact that the protective element is bimetallic. 866 14 Sources of information taken into account at. examination 1.Patent of Germany 1106714, cl. 5a 17/10, pub. 1971. 2. The patent of the USA 2592854, cl. 308-4, pub. 1952 irototype) ““ If R five .