RU2679459C1 - Pneumatic catcher of sucker rods - Google Patents

Abstract

FIELD: oil and gas industry.SUBSTANCE: invention relates to the oil industry and can be used for well drilling. Device includes a built-in high-pressure cylinder with compressed air, used as an energy source and including a pressure indicator. Body is made with a centering stop and with the possibility of communication in the cylinder through the hole overlapped by a spring-loaded spool, installed with the possibility of interaction. When the catcher descends into the well, the upper dangling end of the extracted sucker rod is moved away from the wall of the production column by the guide funnel of the catcher, it is centered by the protrusion of the catcher case and, passing through the collet hole, pushes the valve and opens the hole. Compressed air from the cylinder exits through a slightly open hole into the cavity in front of the piston and acts on the piston. Piston, moving, pushes the collet. Collet rests on the ledge of the safety device body during the movement, and sliding on it, squeezes the extracted sucker rod. Safety cylinder has a nipple for pumping compressed air, a pressure alarm.EFFECT: reliability of fishing works increases.1 cl, 2 dwg

Description

The invention relates to the oil industry, namely to underground well repair. The aim of the invention is to increase the reliability of the capture of dangling or turned pump rods by a fishing tool during the repair of an emergency well.

Various types of sucker rods are known, some of which are described in [1].

The disadvantage of these catchers is the unreliability of capture, there is a high probability of failure of an already captured rod string.

The design of the proposed catcher is illustrated by drawings:

FIG. 1 is a drawing of a General view

FIG. 2 is a view of a pressure switch.

The catcher consists of a cylinder 1 with compressed air, a nipple 2 for pumping air, a spring 3, a spool 4 for bleeding air, a piston 5, a collet 6, a housing 7 and an indicator 8 for the presence of high pressure air in the cylinder 1.

The catcher in the well descends on the suspension from tubing or sucker rods, or on a rope suspension.

During the descent of the catcher, the upper ragged end of the pump rod 9 or the upper unscrewed pump rod is moved away from the wall of the tubing string or production string using the guiding funnel 10, centered on the protrusion 11 in the center of the catcher body, passes through the hole of the collet 6 and pushes the spool 4, hole 12 opens and compressed air from the cylinder, leaving the cavity in front of the piston 5, acts on the piston. Moving, the piston pushes the collet 6. The collet rests on the protrusion 11 and squeezing the rod 9 sliding along the protrusion.

The presence of high pressure in the cylinder 1 is controlled by the indicator 8. If the end face 13 of the indicator is recessed, then the pressure in the cylinder is low.

The catcher is equipped with interchangeable elements for all sizes of rods.

The proposed solution will allow to reliably carry out work on lifting the rod string with a torn or unscrewed sucker rod.

1. Equipment, tools and devices for underground and capital repair of wells. The catalog is a reference. NPP Nefte-Khimmash. Kazan. PO Box 156. 1996

Claims (1)

A pneumatic trap for sucker rods, comprising a housing with a guiding funnel in its lower part, a collet made with the possibility of clamping the retrievable rod, characterized in that it is equipped with an integrated high-pressure cylinder for compressed air or gas used as an energy source and including a pressure indicator, the housing is made with a centering stop and with the possibility of communication with the cylinder by means of an opening blocked by a spring-loaded spool installed with the possibility of interaction with the collet, constant with the piston.

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