RU2265712C1 - Bottomhole ball catcher - Google Patents

Abstract

FIELD: oil industry, particularly devices to move, install, fix, release or remove tools from oil production and injection wells.

SUBSTANCE: ball catcher comprises body with wire guiders arranged inside it. The wire guiders extend from bottom to top thereof from one side to another opposite body side. The ball catcher also has conical wire basket directed so that cone apex face downwards and cone base is arranged under upper point of wire guiders.

EFFECT: increased operational reliability.

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Description

The invention relates to the oil industry and may find application in the creation of devices for moving, installing, fixing, releasing and removing tools in oil producing and injection wells.

A device for crimping drill pipes is known, in the cavity of the body of which two bushings are movably mounted. In the cavity of the inner sleeve there is a valve made in the form of a glass spring-loaded relative to the outer sleeve with windows in its wall. The glass and the outer sleeve have spring-loaded clamps, and the inner sleeve for their placement on the inner and outer surfaces is made with annular grooves (RF Patent No. 19868633, CL E 21 V 34/10, publ. 1994.08.30).

The device provides for further work without lifting the column to the surface. However, the device is complex in design, has many moving parts, and has low reliability.

Closest to the proposed device in technical essence is a device consisting of a housing having through grooves, through which a connecting element slides connecting the sleeve installed inside and the cover. The housing is made with flushing windows in the lower part and with a bottom. The housing has a saddle for a waste shutoff member and is made with annular bores separated by an annular shoulder. Above the upper bore there is an annular groove for the entry of a spring retainer mounted on the outer surface of the sleeve (RF Patent No. 2021474, class E 21 17/00, publ. 1994.10.15 - prototype).

For crimping the tubing string, a shut-off element (ball) is thrown inside it, which sits in the seat seat. Inside the column, pressure is raised and judging by its decrease or absence of decrease, the tightness or leakage of the column is judged.

The disadvantage is that to open the washing windows and perform well operations, the device on the tubing string is lowered to the bottom and the shell and sleeve are moved up by the weight of the string, which is locked in the upper position. The device is not applicable with a large depth of the well and a small length of the column. The device is complex in design, has low reliability.

The proposed device solves the problem of simplifying the structure, increasing the reliability of the structure, quickly removing the ball from the seat saddle after crimping the tubing string without tripping.

The problem is solved in that the borehole ball catcher includes a housing, spring wire guides placed inside the housing, rising from bottom to top from one side diametrically opposite to the other and attached to the housing in the upper part, and a wire cone-shaped basket placed with the top of the cone down and the base of the cone below the top of the wire guides.

SUMMARY OF THE INVENTION

The drawing shows the proposed downhole ball scoop. The borehole ball catcher includes a housing 1 with wire guides 2 located inside, rising from the bottom up from one side 3 of the housing 1 diametrically opposite to the other side 4, and a wire cone-shaped basket 5 placed downward by the top of the cone 6 and the bottom of the cone 7 below the top point 8 of the wire guides 2. The housing 1 is connected to the pipe 9, in which the seat saddle 10 with the ball 11 is located. The whole arrangement is lowered into the well on the tubing string 12.

Downhole ball collector operates as follows.

After the entire assembly is lowered from the wellhead, the ball 11 is dropped into the tubing string 12, which descends along the tubing string 12, touches the wire guides 2, descends from the upper part 4 to the lower 3, wringes the wire guides 2 with its weight from side 3, passes down past the cone-shaped wire basket 5 and is placed in the seat saddle 10. After that, the wire guides 2 made of a spring wire are straightened and occupy their original position. In the string of tubing 12 increase the pressure by pumping liquid. At the same time, the ball 11, being in the landing seat 10, ensures the tightness of the tubing string 12. After pressure testing, circulate pumping fluid through the annulus into the tubing string 12. An upward fluid flow occurs in the tubing string 12, which lifts the ball 11 and by means of the guides 2 presses to the side 4 above the wire basket 5. When the circulation stops, the ball 11 under its own weight is lowered into the wire basket 5.

In this position, it is possible to move the liquid up and down the tubing string 12. When the liquid moves up, the ball 11 rises along the guides 2 to the upper point on side 4 and is held there, as in circulation. When the liquid moves down, the ball 11 is lowered into the wire basket 5.

Thus, the need for removing the ball 11 from the tubing string 12 is eliminated.

The use of the wireline design of the borehole ball trap minimizes resistance to fluid movement inside the tubing string.

The proposed device has a simple design, due to this, it has increased reliability of the design, the speed of removal of the ball from the landing seat after crimping the tubing string without tripping.

The application of the proposed device will simplify the design, increase its reliability.

Claims (1)

The borehole ball catcher includes a housing, spring guide wire guides placed inside the housing, rising from bottom to top from one side diametrically opposite to the other and attached to the housing in the upper part, and a conical wire basket placed with the top of the cone down and the base of the cone under the upper point of the wire guides .