SU1057673A1 - Core-drilling tool - Google Patents

Description

sl vi

00

FIELD OF THE INVENTION The invention relates to mining, in particular to means of drilling wells with coring.

Known are coring tubes that build up a drill string, pipes, a removable core receiver, and a spring lock of a removable core receiver G,

The disadvantages of these projectiles are low reliability and the impossibility of forcibly moving and installing the core receiver by an injecting fluid and without a signal of its p-working position.

Also known are projectiles with a retainer actuated by a pressurized fluid flow, when activated, pressure occurs;

Said projectile contains a drill pipe string, a removable core receiver, and a removable core receiver clamp in the form of a housing with retractable balls, a stepped rod interacting with the balls, and a slide valve connected with the rod in the discharge channel C23. However, in a well-known shot, when the stem moves until the valve opens, on the contact of its surface with the retractable balls, considerable stress is released, which can cause the stem to stick when the load drops when the spool valve opens. As a consequence, the clamping elements do not receive full movement, while a pressure drop in the discharge channel., Indicating installation in the working position, has already occurred.

The purpose of the invention is to increase the reliability of the signal to install the projectile in the working position.

This goal is achieved by the fact that the core tube is additionally equipped with a sleeve with radial holes mn and balls mounted in the radial holes of the sleeve, while the sleeve is placed on a stepped rod with the possibility of axial displacement and interaction with the balls of the fixation unit, and on the matching with the sleeve surfaces of the stem and housing there are annular grooves for displacing the balls. ;

FIG. 1 shows the column. snag d, longitudinal section, general view; in fig. 2 - lock removable core receiver, longitudinal section, general view (in transport position). The column projectile consists of a string of drill pipes 1 and a removable core receiver, including a body 2 with a drill tip 3, extenders 4, a movable thrust 5 dilators 4, a spring 6, and a body

7 retainers, retractable retainer balls 8, a stepped rod 9 with a spool valve 10 and a sleeve 11 with retractable balls 12. The retainer body 7 is hollow and has radial through-holes in which 1 outdresses 8, an annular groove 13 and an emphasis 14 are placed. mounted with the possibility of axial displacement relative to the housing, balls 8 and each other sleeve 11 and a stepped rod 9. Sleeve 11 has through radial holes in the cavity of which balls 12 are placed, and rod 9 has an annular groove 15 and an emphasis 16. The lower part of the rod 9 is made s.up A ring ring 17, which mates with the surface of the cavity of the housing 7, and an injection channel 18 is made inside the stem.

The core receiver body 2 is made hollow and has longitudinal grooves in which sliding submersible extenders 4 are installed. Spline splines are installed on the surface of the body 19. The column of pipes 1 has a landing in the lower part that limits the movement of the removable part of the projectile downwards and ensures the transfer of the moment from the column drill tip. The seat is made in the form of an emphasis 20, an annular groove 21 under the balls 8 and the grooves of the spline connection 19.

Snar d works as follows.

Before descending into the column, the projectile is transferred to the transport position; for this, the rod 9 is moved to the upper position. In this case, the stop 16 moves up the sleeve 11. The balls 12 are displaced into the cavity of the radial holes of the sleeve 11 and are mated with the groove 15. The lower cut of the sleeve 11 takes a position above the radial holes of the housing 7 and the balls 8 are displaced towards the stem Valve 10 overlaps the cavity of the housing 7. In this position, the rod 9 is secured by the forces of the sealing ring 17 against the walls of the housing cavity. Under the force of the spring 6, the body is in its upper position relative to the body 2 of the core receiver. At the same time, the lower C1) without thrust 5 is located above the fixing point of the spring-loaded expanders 4, while the expanders are recessed into the cavity of the core receiver by force of the springs.

A removable capstan projectile is inserted into the column and transported downstream of the flushing fluid. After the housing 2 is seated at the exact location of the column, the fluid pressure in the column increases,

since the bottom of the column is blocked by housing 2.

Under the action of the pressure of the liquid, the rod 9 begins to mix down. The sleeve 11 also moves. since the balls .12 match with the groove 15 prior to mating the lower edge of the sleeve with the balls 8, under the action. . force, represented by sleeve 11, balls 8 are pressed against the inner surface of the column. At the same time, the body 7 begins to move relative to the core receiver body 2 with thrust 5, compressing the spring 6. As soon as the axes of the radial branches, the body versions 7 and the ring groove 21 match, the balls 8 move to the side of the grooves, and the sleeve 11 moves with the stem 9 and down fixes the case in the column. Upon further downward movement of the axis of the radial holes of the sleeve 11, they coincide with the axis of the annular groove 13 and the balls 12 move in the direction of the groove. The sleeve 11 stops (its movement is slowed by the balls 8), and the pin 9 continues to move down until the valve 10 is fully opened. At the same time, the pressure of the liquid in the column decreases sharply. When moving down, thrust 5 spreads dilators 4

in working position. The column leave on the bottom and proceed to drilling.

To remove the snag, the given surface of the column is lifted above the bottom and a natrose is inserted into it, which at the end of the descent is connected to the rod 9. When the catcher is raised, the rod 9 moves to the upper position relative to the housing 7.

0 The snare is loosened in the column and placed in a transport position. The interaction of the parts described above,

5 The presence in the locking mechanism of the projectile of the sleeve 11 with balls 8, mutually acting with annular grooves on the stepped rod 9 and the cavity of the housing 7 provides reliable

. fixing the removable core receiver in the column and full opening of the valve. Since, after fixing the projectile in the column, the balls 8 do not mate with the surface of the stepped stem,

5, they do not prevent it from moving downwards. This also makes it possible to increase the stroke of the li valve to provide a reliable signal on the working position of the removable core receiver.

/eight

Claims (1)

CORE APPLIANCE containing a drill pipe string, a removable core receiver and a detachable core receiver lock in the form of a housing with retractable balls interacting with the balls with a stepped rod and a spool valve connected to the stem in the discharge channel, with I mean that, in order to increase the reliability of the signal that the projectile was set to its working position, it is equipped with a sleeve with radial holes and balls installed in the radial holes of the sleeve, while the sleeve is placed on a stepped rod with the possibility of 'axial' displacement and. interaction with balls fixing node (and on the mating surfaces with the sleeve shaft and the housing performed kol- _Ω tseshe grooves for biasing the balls. § ω c S3. sl m o m co> occurs with the pitching giving the projectile contains a column pipe, a removable core