SU1507948A1 - Device for breaking groove portions in borehole wells - Google Patents

Abstract

The invention relates to drilling equipment and m. used to destroy the gutter openings (B) in the walls of the well. The goal is to increase the reliability of work. The device includes cutting elements (E) 3, mounted on the outer surface of the hollow cylindrical body (K) 1, and the protection mechanism E 3 when transporting the device in the well. The latter consists of a sleeve 4, a shear pin 6, pushers 7, hollow toroidal sectors 8, a pre-stretched annular coil spring 9, a sleeve 10 with a saddle and a ball 11 and a perforated partition 12. The sleeve 4 has an outer annular groove 5 and is movably mounted in an axial channel 2 K 1. The outer end of the pin 6 is fixed in K 1, and the inner one is placed in the groove 5. The pushers 7 are installed in the radial holes of the middle part K 1. The sectors 8 are placed on K 1 with a gap between them and fastened to the outer ends of the pushers 7 . Spring 9 ra meschena within sectors 8. The lower portion of the sleeve 4 is designed as a collet sleeve 15, which is installed inside the sleeve 10. The piles 16 K lower part 1 holds the annular broadening 17. Bottom 1 is attached to the K column drill collar. On the drill string device is lowered into the well. When it is lowered, E 3 is protected from contact with the borehole walls by sectors 8. After reaching the upper boundary B, a ball 11 is dropped into the drill string and the washing fluid is injected. Under its pressure, the pin 6 is cut and the sleeve 4 moves down. The inner ends of the pushers 7 are moved to the groove 5 and the sectors are sunk beyond the dimension E 3. At the same time, the sleeve 10 expands the collar 16 and lowers onto the partition 12, after which the circulation of the washing liquid is established. Destruction B is carried out by repeated lowering and lifting of the device in the interval B. 2 Il.

Description

A spring 9, a sleeve 10 with a saddle and a ball And and a perforated partition 12. The sleeve 4 has an outer annular groove 5 and is movably mounted in the axial channel 2 K 1. The outer end of the pin 6 is fixed in K 1, and the inner one is placed in the groove 5. Pushers 7 are installed in the radial holes of the middle part K 1. The sectors 8 are placed on K 1 with a gap between them and fastened to the outer ends of the pushers 7. The spring 9 is placed inside the sectors 8. The lower part of the sleeve 4 is made in the form of a collet sleeve 15, on the inner collar 16 of which a sleeve 10 is installed. In the lower part K 1, an annular broadening 17 is made. From below, an utter drill string is attached to K 1. On the drill string device is lowered into the well. When it is lowered, E 3 is protected from contact with the borehole walls by sectors 8. After reaching the upper boundary B, a dipstick 11 is dropped into the drill string and washing fluid is injected. Under its pressure, the pin 6 is cut and the sleeve 4 moves down. The inner ends of the pushers 7 are moved to the groove 5 and the sectors are sunk beyond the dimension E 3. At the same time, the sleeve 10 expands the collar 16 and lowers onto the partition 12, after which the circulation of the washing liquid is established. Destruction B is produced by repeated descent and ascent of the device in the interval B. 2 Il.

The invention relates to a drilling technique and can be applied to destroy runoff openings in the walls of a well.

The purpose of the invention is to increase the reliability of work.

FIG. 1 shows a device, a longitudinal section; in fig. 2 shows section A-A in FIG. one.

A device for destroying groove workings in the borehole walls consists of a hollow cylindrical body 1 with an axial channel 2, cutting elements 3 fastened to the upper part of the body, and a protection mechanism for the cutting elements when the device is transported in the well (not labeled). The protection mechanism of the cutting elements includes a sleeve 4 with an annular groove 5 on its outer surface, movably mounted in channel 2, shear pin 6, pushers 7, hollow toroidal sectors 8, previously extended annular cylindrical spring 9, sleeve 10 with a saddle (not shown) and a ball 1 1 and a perforated partition 12, attached to the lower part of the housing 1. The outer end of the pin 6 is fixed in the housing, and the inner end is placed in the groove 5. Rubber seals 13 are mounted on the outer surface of the sleeve 4. Pushers 7 with upl tneni E 14 are placed in radial holes (not labeled) of the middle portion of the housing. Sectors 8 are placed on the body circumferentially with a gap between them and fastened to the outer ends of the pushers 7. Spring 9 is located inside sectors 8. The lower part of the sleeve is made in the form of a collet sleeve 15 with an inner shoulder 16. The sleeve 10 is installed on the collar 16. At the bottom

The housing 1 between the partition 12 and the sleeve 4 is provided with an annular broadening 17. A device for destroying groove workings in the walls of the well works as follows.

The device is lowered into the well on the drill string (not shown). A thread of flat drill bits is attached to the thread on the lower end of the body.

Q pipes, the weight of which creates lateral force, which presses the device against the wall of the well, on which grooved workings are located. During the descent of the device, the sleeve 4 is fixed in the axial channel 2 by the pin 6 in the extreme upper position. Pushers 7

 the springs 9 are tightly pressed to the outside of the sleeve 4 below the groove 5. The device dimensions by sector 8 are larger than the nominal diameter of the device by cutting elements 3, therefore, when the device is lowered, the cutting elements 3 are prevented from rubbing against the borehole walls, especially when passing uneven sections of the barrel. After reaching the upper boundary of the gastric mine, the descent of the device is stopped and a ball AND is dropped into the drill string, which is lowered onto the saddle of the sleeve 10. Next, a flushing fluid is pumped into the drill string, under the pressure of which the pin 6 is cut off and the sleeve 4 moves down . When lowering the sleeve 4 internal

0, the ends of the pushers 7 are moved by the action of the spring 9 into the annular groove 5. The sleeve 4 sags on the pushers 7. In this position, the cutting elements 3 protrude beyond the dimensions of the sectors and are ready for the destruction of grooved workings. Under the influence

5, the pressure differential sleeve 10 expands the shoulder 16 of the collet sleeve 15 located in

an annular widening zone 17, and is lowered onto the septum 12. Thereafter, the flushing fluid leaves the body in the annulus and rises to the wellhead. The well walls are planed by repeatedly lowering and lifting the device by an amount equal to the length of the lead (working) pipe. At the same time, the width of the groove development is adjusted to the size, by 5-10 mm of the smaller diameter of the device. If the groove interval is longer than the lead pipe length, the drill string builds up and the well wall planing is repeated at the low-lying interval. To speed up the work, it is possible to install several devices into the drill string at a distance of no more than the length of the lead pipe from each other.

The process of destruction of the gutter development is controlled by the volume of the sludge carried out, by the change in the readings of the weight indicator, and after completion of the work - by metering with a pressure tester.

Claims (1)

Invention Formula A device for destroying groove workings in the walls of a well, including 0 five 0 five cutting elements placed on the outer surface of the hollow cylinder of the housing, and the protection mechanism of the cutting elements during transportation of the device in the borehole with a sleeve installed in the housing with axial movement, characterized in that, in order to increase the reliability of operation, the cutting elements are fastened to the housing, The radial holes are made in the middle part of the body, in the lower part there is an annular extension, an annular groove is made on the outer surface of the sleeve, and the lower part of the sleeve is made in the form of a collet bushing with an inner collar, while the protection mechanism of the cutting elements is provided with a shear pin, the outer end of which is fixed in the housing, and the inner end is placed in the annular groove of the sleeve, pushers mounted in the radial holes of the housing with the possibility of axial movement and placement of their inner ends in the annular groove sleeves in its lower position, hollow toroidal sectors, fastened to the outer ends of the pushers, an annular spring placed inside the sectors, a sleeve with a saddle and a ball mounted on the collet collet collar and perforated partition attached to the bottom of the case.