SU998728A1 - Drilling tool - Google Patents

Description

(54) DRILLING RING

The invention relates to mining, in particular to tools for core drilling.

A drilling rig is known in which the fixing of the removable core receiver in the outer core tube is carried out by sliding stoppers, the ends of which are facing the lifting fungus SI.

The disadvantage of this projectile is that the stoppers can exit the thrust projection with a slight deformation or wear of the mating surfaces.

It is also known for the projectile, where the stopper, in addition to the spring, is also held by the locking clutch. Such a projectile contains an outer tube, a removable core receiver with a housing, installed in the housing consumable stoppers, a return sleeve with a locking pin and a catching fungus interacting with the C23 overshot.

During jamming of the core receiver in the outer core tube of the said projectile, the stoppers holding the core are complicated, and the receiver does not move up during drilling. This is due to the fact that when stopping, the stoppers must be moved along an arc of a circle centered on the axis of rotation of the stoppers. However, jamming of the core receiver does not allow such movement along an arc.

With a strong core receiver, it is impossible to detach and raise the core receiver with the overshoot, the overshot itself is also difficult to detach from the core receiver, especially when drilling horizontal wells. This is due to the fact that with a strong jamming of the stopper, under the action of the return sleeve, they cannot move and exit from the end of time d by the external core tube.

The aim of the invention is to increase reliability by preventing an accident when a core receiver stumps with a core.

The goal is achieved by the fact that in a drill bit, the return sleeve is made with a contact

25 with an overshot and a movable spring relative to the body, with the stoppers located with diverging ends in the direction away from the fishing fungus, and the fishing fungus attached to

30 enclosure.

Fig, 1 shows a projectile in the working position; in fig. 2 is the same at the time of extraction.

The shell contains an outer tube 1, a removable core receiver 2 installed inside it, a sub-dipstick assembly attached to its upper part to hold the core receiver 2 in the pipe 1 including housing 3 mounted with the possibility of rotating the stopper 4, fishing fungus 5, and wearing a return sleeve b on the case with a spring 7 and a pin 8. The outer pipe 1 is provided with a stop groove 9 under the stoppers 4, and the sleeve 6 with a protrusion 10 for interacting with the overshot 11 with the latches 12. The stoppers 4 are provided with a spring 13.

The device works as follows.

To feed the core receiver along the drill pipe string to the outer core pipe 1, the return sleeve 6 is pushed from the fishing fungus 5, retracted inside the stoppers 4 and the pin 8 comes out of contact with the stoppers, the core receiver 2 is lowered into the drill pipe string, with the stoppers 4 being subdivided The spring 13 slides through the pipe string when dispatching. When approaching the groove 9, the stoppers 4 move apart and occupy their working position, the pin 8, the entrance to the groove formed by the stoppers 4, fixes them in the extended state, thus ensuring fixation of the core receiver 2 in the outer core tube 1.

To remove the core receiver, the overshoot 11 is lowered into the drill pipe string (FIG. 2) and brought to the core receiver, pressure is applied to the slope 10 of the return sleeve 6 and the pin 8 is released from the engagement with the stoppers 4, which are then removed inside the node. . After this overshot 11 snaps 12 capture the fungus 5 core receiver 2.

When the core receiver is sticking with 2 core overshots 11, reached the core receiver, the pressure on the protrusion 10 of the return sleeve b cannot move the return sleeve and, accordingly.

the pin 8 cannot be removed from the hooks 55 nor with the stoppers 4, and the stoppers cannot move inside the knot. At the same time, overshot 11 with its snaps 12 does not capture the fungus 5 of the core receiver 2.

The preferred application area of the proposed drill is drilling inclined, horizontal, and revolting wells.

The implementation of the proposed projectile will reduce the number of emergencies associated with the need to remove the projectile from the well, along with the overshot and the cable to it.

The advantage of the proposed projectile is the possibility of extracting an overshoot without special overslot-freeing nodes, the use of which is currently inefficient and does not preclude emergency situations, including those that are dangerous to staff, I I

Claims (2)

1. A complex of technical tools for diamond drilling of wells with projectiles with a removable core receiver, sec. L, ONTI, VITR, 1975. 2. US patent number 3340939, cl. 175-246, published. 1967 (prototype).