SU1283354A1 - Magnetic milling cutter - Google Patents

Abstract

The invention relates to a technique for cleaning bottom holes and improves the efficiency of metal trapping. For this, a hollow cylindrical nonmagnetic body (K) 1 of a magnetic mill (MF) with an adapter 3 in the upper part, a milling crown 4 in the lower part and a magnetic system on the inner surface radial holes 2 located symmetrically around the circumference and

Description

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height in several Russ. They contain magnetic cells (ME) of the magnetic system. Each ME is made in the form of a ferromagnetic cup 5. Inside it there is a dielectric casing 6 with a plug 7 of ferromagnetic material and a permanent magnet 8 between the plug 7 and the bottom of the cup 5. On the outside of the cup 5 there is a dielectric probe1

The invention relates to tools for cleaning the bottom of a well from ferromagnetic metal objects.

The purpose of the invention is to improve the efficiency of metal trapping.

The drawing shows schematically the proposed Map Mill, general view.

The magnetic milling cutter consists of a cylindrical hollow non-magnetic body 1 with radial holes 2. In the upper part of the body 1 there is an adapter 3, in the lower part there is a milling crown 4 magnetic cells, each of which is made in the form of a ferromagnetic cup 5, the bottom of which faces the outer side of the case, installed in the cavity of the cup of the dielectric casing 6 with a stopper 7 of ferromagnetic material and a permanent magnet 8 between stopper and the bottom of a cup located on the outer side of the last dielectric stopper 9.

The device works as follows.

The magnetic mill is lowered into the well on the string of drill pipe. No income to the bottom, begin flushing and rotation of the drill string. When the mill is rotated on the face, metal objects are destroyed with a simultaneous tool feed.

VNIIPI Order 7394/27 Circulation 532

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ka 9, the bottom of the glass 5 is turned to the outside of K 1. In the process of operation, the MF is rotated over the face, contributing to the destruction of metal objects. They fall into K 1 and are attracted to ME. Next, MF raise to the surface. Thus, as the ME works as an independent system and in. At the same time, the lifting force of the MF is the sum of the forces of all ME. 1 il.

The destroyed metal objects fall inside the housing 1 and are attracted to the elements of the magnetic cells. After that, the rotation of the tool is stopped, the rinsing of the well, and the mill is raised with attracted metal objects to the surface. Each magnetic cell operates as an independent system, and at the same time the mill lifting force is the sum of the forces of all the cells.

Claims (1)

Invention Formula Magnetic mill, containing a hollow cylindrical non-magnetic body with a threaded adapter in the upper part, a milling crown in the bottom and a magnetic system on the inner surface of the cylindrical body, characterized in that the body is made with radial holes symmetrically around the circumference and along the height of several Rus, and the magnet system is made up of magnetic cells installed in the holes of the casing, each of which is made up of a fairy a romagnetic cup, the bottom of which is facing the outer side of the housing, installed in the cavity of the cup of a dielectric housing with a stopper made of ferromagnetic material and a permanent magnet between the stopper and the bottom of the cup with a dielectric stopper located on the outside. Subscription