SU855193A1 - Apparatus for cleaning walls of oil and gas wells - Google Patents

Description

I

The invention relates to the drilling of oil and gas wells with the identification of downhole motors, namely, devices for cleaning the walls of wells from mudcake.

A device is known for cleaning the walls of a borehole from shale clay, comprising a body, in the slots of which the scrapers are inserted with the possibility of radial movement relative to the body fl.

A disadvantage of this device is that the rotating scraper is short-lived, therefore, when the turbine bumps and rhenium in the opschea, distortions and seizing occur.

A device is known for cleaning the walls of oil and gas wells, comprising a housing with a cemetery and sockets in which radially displaced sleeves are mounted with fastening. scraper elements inside them 2.

The disadvantage of this device lies in the unreliability of its operation, since.

unable to axially move, the scraper elements in the process of work break quickly.

The goal of the isofotensh is to increase the reliability of the device operation by providing axial movement of the scraper elements.

The goal is achieved by the fact that the device is equipped with a concentric-mounted housing with end-to-end long Tphoresis in the middle part for accommodating the scraper elements, and elastic shells are installed on the sleeves ..

FIG. 1 shows a device, a longitudinal section; FIG. 2 is a section A-A in FIG. 1; FIG. 3 shows the node I in FIG. 2

The device consists of a crush 1, in the sockets 2 of which scraper elements 3 are placed rigidly fixed in sleeves 4 with angle shells 8 on the outer surface. Cleaning elements are held in slots 2 enclosures

1 1fn pts ptshtsy sleeve 6, when vsholiena with longitudinal through slots

7in the middle part. In these slots is placed the middle part of each cleaning element 3, one end of which is placed in the nest 2 of the cone 1, and} Zrut (L, working, stands for the dimensions of the sleeve 6,

The sleeve 6 is fixed on the housing 1 between the centralizers S and 9 | phi using the adjusting ring 10.

The housing I in the upper and lower parts is threaded to connect on top of the drill bit KOLSYNYA or the downhole motor, and from the bottom - the bit.

The cleaning of the borehole walls by the proposed device is carried out as follows.

The cleaner is attached either to the downhole motor shaft or to the drill string above the bit. During the rotation of the clay tool, the crust is removed from the borehole walls by the scraper elements 3. At the same time, the scraper elements 3 can make axial movements in the slots of the sleeve 6 and radial movements as a result of the deformation of the elastic shells 5. At the same time, the centralizers are calcined

8 and 9, which protect the cleaning elements 3 against wear.

The device under consideration increases the AND 9-axle. The integrity and durability of the scraper elements.

Claims (2)

1. US patent number 2670046, class. 166-173, published. 1954. 2. USSR author's certificate according to application no. 2526809, class E 21 O 37 / OO, 1977.