SU1266955A1 - Drill string - Google Patents

Abstract

The invention relates to the technique of well drilling and is intended to increase the reliability of operation in drilling wells of 6, 4BHJoro diameter with forced core cutting. To do this, on the outer surface of each pipe (T) 4 of the inner) and the drill string are fixed the top 5 and bottom 6 stops. The outer diameter T 4 is equal to the inner diameter of the adapters 2, attached from above to the T 1 of the outer row of the drill string. Couplings 3, connected to the bottom of T 1, are provided with restrictive plates 8 with locking washers 9. The washers 9 are made with openings for not tempering T 4 in them. A spring 7 is installed between the plate 8 and the stop 6 of each T 4 the hydraulic actuator transmits the force to T 4, which moves downward by the magnitude of the spring stroke 7. In this case, the force T 4 is transmitted to the core trimming mechanism. After the core cut-off, the drive is turned off and the T 4 moves up to the extreme upper (L position fixed by the stop 5. 2 Il. ND O5 O5 CO ate SP

Description

The invention relates to a bu-e and borehole technique, namely to devices for drilling wells of a bore diameter with a forced cutter;

The aim of the invention is to improve reliability.

FIG. 1 shows a double hermetic drill string, longitudinal section; in fig. 2 shows section A-A in FIG. one.

The drill string consists of an outer row of pipes 1, to which nerehodniki 2 are attached from above, and below - couplings 3. A number of inner pipes 4 are mounted into the outer pipes, on the outer surface of which are fixed upper holes that restrict the upward movement of the inner pipes lower abutments 6, which are the upper limiter of the spring 7, which by its lower end rests on the limiting plate 8 held by the locking H-9.

The device works in the following way.

At the end of the drilling process for performing core trimming, a hydraulic power actuator located on the drive drill pipe (not shown) is turned on. The force from the drive is transmitted to the inner tubes 4, which begin to move downward by the amount of the working stroke of the spring 7 located between the lower abutments 6 and the limiting bar; Asthina 8. Internal pipes transmit force to the core trimming mechanism located in the drilling tool. At the end of the nose cut, the power cut-off cut-off is turned off and the internal cuttings return to their original position, while at the top-most position they are fixed by the upper stops 5 in contact with the adapters 2.

Claims (1)

Invention Formula The drill string, including the inner and outer with adapters and couplings, has a row of pipes, characterized in that, in order to increase reliability of operation, it is equipped with springs, and the inner row of pipes is made with an external diameter equal to the inner diameter of the adapters, and equipped with fixed on the outer surface of each pipe, the upper and lower ones, while the couplings are provided with restrictive plates with stoner washers, made up with holes for non-displacement of the inner row of pipes in them, and springs They are installed between the restrictive bottom plate and the bottom hole of each tube of the internal row, and the internal row of pipes is mounted with the possibility of longitudinal movement by the amount of spring travel and contact with the adapters by the upper stops.