SU874952A1 - Expander - Google Patents

Description

(54) EXTENDER

one

The invention relates to mining, namely, equipment for a well.

Known dilator roller, comprising a housing with bypass channels, a piston unit and retractable working bodies mounted on the upper sliders 1.

The disadvantage of this expander is its low load capacity due to the cantilever attachment of the working bodies.

Also known extender, comprising a housing, a piston unit and sliding interchangeable working bodies mounted on the upper and lower sliders, interacting with the housing and the piston 2.

A disadvantage of the known extender is the limited functionality it has, since the support assemblies fail due to high dynamic loads.

Thus, the known extenders cannot be used, for example, to expand the pipes when the loads on the supports increase further.

The purpose of the invention is to expand the functionality of the extender by increasing the strength of the support assemblies.

The goal is achieved by the fact that in the diverter, which includes the housing, the piston assembly, and the retractable replaceable working elements installed on the aperture and lower sliders, interacting with the housing. catfish and piston surface glide

 upper and lower sliders are parallel to each other.

FIG. 1 shows the instrument in the transport position, general view; on fng. 2 - tool in working position

IQ when performing a borehole expansion operation, general view; on fng. 3 is a section BB in FIG. 2; on fng. 4 - - section A-A in FIG. one; in fig. 5 - tool when performing the operation of milling the ends of the overlap, general view; in fig. 6 - - tool 5 cop when performing the operation of expanding the walls of the ceiling, general view; on fng. 7 shows an instrument and an overlay, a cross-section B-B in FIG. 6

Claims (2)

The scraper contains (fig. 1, 2, 3, and 4) 20 body 1 with bypass channels 2 and 3, the outputs of which are disconnected by 1-luke 4, piston 5 mounted in a cylindrical casing of the body n and equipped with an nt upper face shaped groove 6 , removable retractable working bodies 7, mounted on a sliding bearing, located between the upper 8 and lower 9 sliders, interacting with the shaped support surfaces made in the piston and in the housing. Surfaces 10 and P of the lower slider are located in mutually - perpendicular directions. The sliding surfaces 10 and 12 of the upper to lower sliders are parallel to each other. The extension of the working bodies is limited to the ring 13. Channels 14 are provided for cleaning the working bodies from the Aya drill. Using threaded connections, the tool is connected to the drill string 15 and a guiding device (not shown). Working bodies 7 in the proposed device is made in the form of a single cone cones. equipped with rock-breaking elements In this case, it is used to expand the borehole at a predetermined interval. In other versions, the working bodies 16 of the expander are integral with the sliders (Fig. 5) and equipped with cutting or rock-breaking elements, as well as multi-conical rollers 17, facing downwards with the large base of the main cone 18. The proposed tool works as follows. . The tool is connected to the drillstring 15 (Fig. 1 and 2) and lowered into the well. After reaching a predetermined interval, flushing fluid is injected into the drill pipes, which flows through the bypass channels 2 under the piston 5. Due to the pressure difference inside the tool and in the annulus, the piston 5 moves the sliders 8 and 9 and the working bodies 7 to the upper position until it stops in the ring 13. At the same time, the tool is rotated, and the working bodies 7 and 17 destroy the rock or mill or flare a profile interrupter 19 installed in an extended portion of the borehole. DETAILED DESCRIPTION OF THE INVENTION An extender, an enclosure, a piston assembly, and retractable interchangeable bodies installed on top and bottom sliders that interact with the body of the piston, characterized in that, in order to expand the functionality, the sliding surfaces of the upper and lower sliders are parallel to each other. Sources of information taken into account in the examination 1. USSR Authorship number 582373, cl. E 21 B 9/28, 1974. 2. US patent number 2809015, cl. 175-232, published: 1954 (prototype).