SU746083A1 - Earth-drilling tool - Google Patents

Description

(54) BURRAY SHOOTING

I

The invention relates to mining, in particular, to devices for drilling wells without lifting a drill string for changing a rock-breaking tip and removing a core.

Drilling tools are known that contain a string of drill pipes and removable elements with a locking mechanism 1. In these tools, the rock-breaking tip is fixed from longitudinal displacement and from turning, and the core receiver is only from longitudinal mixing.

The disadvantage of this technical solution is the possibility of damaging the fixing elements of the core receiver when various core pins and projectile elements are attached.

This disadvantage is partially eliminated in the shells, where the core receiver, as well as the rock-breaking tip, is fixed against rotation relative to the drill string.

A well-known drilling rig containing a string of drill pipes, a removable part with a rock formation, a tip, a core receiver and a mechanism fixing the core receiver, performed as

spring dies interacting with the surface of the longitudinal grooves on the inner surface of the pipe 2.

The reliability of such a projectile depends on the accuracy of the fixing elements with the adjacent surfaces of the drill string at the same time at the locations of the core receiver and the rock-breaking tip.

The purpose of the invention is to increase the reliability of the operation of the drilling projectile by preventing the longitudinal displacement of the removable part at the moment of its fastening with the locking core receiver mechanism in the longitudinal grooves.

The goal is achieved by an annular bore on the inner surface of the pipes above the longitudinal grooves, and protrusions for interacting with the annular boring on the dies.

FIG. 1 shows the proposed projectile, longitudinal section; in fig. 2 — a device fixing the core receiver, a longitudinal section, the moment of installation of the plates in the grid; in fig. 3 - the same at the moment of complete fixation; in fig. 4 - the same, when moving the removable elements in the column while lifting the removable elements of the projectile; in fig. 5 is a section A-A of FIG. 3; in fig. b - section bb fig. four..

The drill consists of drill pipes 1, core 2, fixing core receivers, containing spring-loaded plates 4 interacting with the bore 3 of the outer pipe, and rock cutter tip 5. The pipe 1 is provided with windows 6, which form the grooves closed from the outside by sleeve 7, and the dies are ledges 8 and 9, interacting with the bore and window of the outer tube. Dies 4 are provided with oblique slits 10, through which pin 11 is connected, connected with lifting lug 12, and rock breaking tip 5 is a pipe 13 with a crown 14 and a sliding spreader 15 of the collet type:

The rock breaking tip 5, together with the core core 2 and the locking mechanism, form the removable part of the drill bit.

Snar d works as follows.

When the core receiver connected to the tip 5 is lowered, the plates 4 slide along the inner surface of the outer tube 1 of the projectile and when the bore 3 is reached, they are inserted into it by the projections 8 under the action of the spring b: {fig. 2), and the removable elements extend into their working position (wherein the keys 17 of the housing 18 of the expander 15 fit into the wedge-shaped grooves 19 of the orienting device of the outer composite pipe 1, turning the housing 18 so that the incisors 21 connected with it by the flexible plates 20 the expander 15 is oriented opposite the sockets 22 at the lower end of the outer pipe and is pushed into these sockets by a crown 14 and a core receiver pipe 13 (see Fig. 1). After this, they are lowered to the bottom of the well and the pipe 1 is rotated; rotates (since neither Its part, terminating with the crown 14, rests on the bottomhole and engages with it), in the case of the 6jB window head some time is opposite the projections 9 of the dies 4, and immediately under the action of the spring 23 the protrusions of the 9 dies are recessed into window B (Fig 3) and the outer pipe 1 is engaged with the core receiver 2, and the entire projectile with all its components rotates as one rigidly fixed both in the axial direction and in the plane of rotation.

When lifting the core 2 together with the tip 5, the plates 4 are withdrawn from.

746083

the engagement with the bore 3 and the windows 6 of the outer pipe, and with the help of a flattened cable on the rope, the detachable part is lifted to the wellhead. In this case, the head 24 of the earring 12 is lifted and raised, the pin of which, pressing the oblique slits 10 of the dies 4, compresses the latter, overcoming the resistance of the springs 6 and 23 and releases the dies from the interaction with the outer tube (see Fig. 4). At the same time, the tube 13, connected with the core 0 receiver 2, also rises together with the crown 14, freeing the incisors 21 of the expander 15, which, in turn, come out of the sockets 22, heading towards the center, and the expander, hanging by the housing 18 on the collar 25, pipe 13 also rises.

The implementation of fixing the core receiver not only in the axial-axial direction, but also in the plane of rotation with the same plates eliminates the need for additional devices for fixing removable elements, prevents the caps from turning B into the bore of the outer tube and prevents the plates and boring from wear the result of such a twist, and generally contributes to increased reliability of fixation

removable items in snar de.

Claims (2)

1. US patent number 3437159, CL. 175--260, published. 1972. 2. US patent number 2184361, cl. 175-246, published. 1939 (prototype). i5, i8 / J 25 20 -22 -21 / A 1 / (Rig.5 12 but 2 12 FIG. 6 -23