SU1452930A1 - Downhole fishing device - Google Patents

Abstract

This invention relates to tools for extraction from; boreholes of small metal objects (MP), for example, chisels, cones, dies, and allows to increase the reliability of gripping an emergency object. The downhole fishing device comprises a housing 1 with springs mounted with hinges relative to

Description

one

The invention relates to the repair of wells, namely, for the extraction of small metal objects from the bottom, such as bits, cones, dies, etc.

The purpose of the invention is to improve the reliability of the capture of the emergency object.

FIG. 1 shows the device, a general view; in fig. 2 is a section A-L in FIG. one; in fig. 3 is a diagram of the process of capturing a retrieved object.

The device consists of a housing 1 with hinged and spring-loaded with a spring 2 relative to the housing 1 gripping elements in the form of petals 3, from a ferromagnetic material of the fixing ring 4 made of non-magnetic material-2A and mounted on the outer part of the petals 3, operation unit gripping elements made in the form of a source installed in the housing

5 current (generator) with impeller located 25 in its upper part

6 and an electromagnetic coil 7 with a rod 8 mounted therein with the possibility of axial movement. At the lower end of the generator 5 there is an electric contact 9 for interacting with the upper end of the rod 8 when the latter interacts with the object to be extracted.

The cavity of housing 1, in which the generator 5 and the electromagnetic coil 7 are installed, is isolated from

0

about 5

about

the washing liquid by the membrane 10, and the electromagnetic coil 7 is connected to the generator 5 by electric drives 11.

The device works as follows.

The safety device on the drill pipe 12 is lowered to the bottom of the well and include pumps. The flushing fluid, the passage through the impeller 6 and the radial channels 13., reaches the bottom of the well, clearing the object from the sludge. Rotating with the passage of pro-i flushing fluid, the impeller 6 drives the generator 5, which generates electricity. When landing the catcher on the bottom of a well, the retrieved object is directed into the space between the petals 3, interacts with the thrust rod 8 and, moving it up, closes the electrical contact 9 of the generator 5. After closing the contact 9 of the generator 5 with the rod 8, a magnetic field occurs from the bottom the end of the rod to the top, which magnetizes the petals 3, moved-to the center of the device and exciting the object to be retrieved. At the same time, a metal object is pulled into the magnetic field and is attracted to the lower end of the rod. 8, and the locking ring 4 moves downward, locking the petals 3 on the object to be removed and preventing them from disengaging when the tool is lifted.

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Claims (1)

Claim Downhole fishing device containing a housing with gripping elements installed in its lower part in the form of spring petals, a retaining ring located in the upper part of the outer surface of the gripping elements, a gripping element actuation unit with a rod located in the housing with the possibility of axial movement, about l A ~ And the fact that, in order to increase the reliability of capture of an emergency object, the response unit of the gripping elements is made in the form of a current source installed in the housing with an electrical contact on it about the lower end and the electromagnetic coil located below it, and the rod of races _{10 is} placed in the electromagnetic coil with the possibility of interaction of its upper end with the electrical contact of the current source and the formation of a magnetic field directed from the lower 15 end of the rod to the upper when the lower end interacts with the extracted object, moreover, the retaining ring is made of non-magnetic material, and the gripping elements 2Q of ferromagnetic material. Srig. 2