SU1541374A1 - Catching device for wells - Google Patents

Abstract

The invention relates to the drilling of wells. The goal is to simplify the design of the device while reducing energy costs in the production of fishing operations. For this, on the outer surface of the housing 1 under the radial hole 9 opposite the screen 12 there is a grooved-shaped notch 20. The inner surface of the screen 12 is concave made as part of a sphere. The connection of the screen 12 with the housing 1 is made in the form of a hinge located in the upper part of the screen 12. The longitudinal axis of symmetry of the recess 20 of the screen 12 and the axis of the hole 9 are located in the same vertical plane. In the wall of the housing 1 there is a magnetic latch opposite the screen 12 on the side diametrically opposite to the hinge. The width of the screen 12 is selected so that the liquid stream from the nozzle 10 does not fall on the walls of the well, protecting them from erosion. Reflected from the screen 12 is focused and directed back to the housing 1, where it is reflected in the recess 20 and again directed to the screen 12. This improves the efficiency of using the energy supplied by the liquid. This device allows eliminating accidents both in cased and uncased wells, traversed by rocks of any hardness. 1 hp ff, 4 ill.

Description

The invention relates to the field of drilling wells, and more specifically to drilling devices used to eliminate accidents with pipes, the upper end of which is significantly different from the axis of the well (this has a place in the case of the presence of cavities or grooves). or in the case of the use of pipes whose diameter is significantly smaller than the diameter of the well).

The purpose of the invention is to simplify the design of the device while reducing energy costs during production operations.

FIG. 1 shows the device, a general view in section; FIG. 2 is a cross section. | a) A-A in FIG. one ; in fig. 3 cross section ™ ieB-Bnafig. one; in fig. k - device in working position, general view.

The downhole fishing device includes a housing 1 with a gripping unit in the form of a tap 2 for connecting to an emergency column and a threaded sleeve 3 for connecting to a column pipe k on which the device is lowered into the well. In case 1, an axial hole 5 is made, in which a plug 6 is placed with through axial channels 7, the total area of flow areas of which ensures flushing through the pipe connected to the fitting (tap or gearbox) without significant pressure differences of the drill solution o The plug 6 also has a channel 8 connected to the radial hole 9 in the housing 1, at the exit of which a cone nozzle 10 is placed.

In the upper suit of the body 1 there is a groove 11, where it is placed with the possibility of radial movement.

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screen 12, ball connected to housing by means of pin 13. To fix screen 12 in transport position in the lower part of groove 11 in the wall of the case opposite the screen on the side diametrically opposite to screen hinge, a magnetic clamp made in the form of a permanent magnet 1. Radial hole 9 is brought into groove 11, where a screen 12 is placed opposite this opening.

The upper surface of the plug 6 is inclined towards the inlet of the channel-8, which is offset on the plug 6 towards the radial hole 9. The entrance of the channel 8 is made in the form of a hemispherical hole 15 under the ball discharged into the pipes.

The fishing device is equipped with a flow shut-off unit made in the form of a discontinuous diaphragm 16 installed in the axial channel of the tap 2 and secured by an annular nut 17. The screen 12 is made with an internal concave surface 18 as part of a sphere that provides the focusing of flushing liquid jets and the direction of the reflected jets 19 into a groove-shaped recess 20 located below the radial hole 9, the longitudinal axes of the screen 12, the notches 20 and the radial hole 9 being located in the same vertical plane, which increases There is no focusing efficiency for reflected jets (Fig. b.

Plating works using the proposed device are as follows.

In the event of an accident — leaving the pipe in the borehole — the character of

breaking the emergency pipe. Taking into account the nature of breaking and the internal diameter of the pipe, a gripping unit is selected, for example, a tap of the appropriate size.

The prepared tap is lowered into the well on the drill pipe 4 (FIG.). At the approach of the tap to the upper end of the emergency pipe 21, the axis of which is 0, - 0, is deflected from the axis of the well Og - 0, the pump of the drilling rig is turned on and the drilling fluid is supplied with a corresponding pump performance. The drilling mud 19, exiting the cone nozzle 10, creates a reactive force deflecting the tap 2 from the axis of the well O-02 in the opposite direction.

The flow coming out of the nozzle acts on the screen 12, which turns on the pin 13 until it contacts the wall of the well, after which the reactive force of the pressure jet deflects the device in the opposite direction. At the same time, the width of the screen 12 is selected so that the liquid stream from the nozzle 10 does not fall on the walls of the well, protecting them from erosion. The jet 19 reflected from the screen is focused and guided back to the housing 1, where it is reflected in the groove-shaped recess 20 and again the screen is not directed.

Thus, the energy of the jet 19 is reused to create an additional deflecting effect, which increases the efficiency of using the energy supplied by the fluid.

The azimuthal deviation of the tap is provided by slow rotation of the rotor in the drilling rig. At the same time, a string of drill pipes with a tap is fed down to contact with the upper part of the emergency pipe 21, which is determined by the reduction in the weight of the pipes - by means of a hydraulic weight indicator. Next, screw the tap into the emergency pipe. In order to maintain the subsequent flushing, they destroy the diaphragm 17 by increasing the pressure of the drilling mud over tared by lowering a ball into the pipes k, which, having reached

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plugs 16, rolls down the slope of hole 15. Channel 8 is blocked, the pressure on the diaphragm 17 is increasing.

After the tool is connected to the emergency column, the latter is lifted to the surface, while the screen 12 is adjacent to the wall of the housing 1 and is held in this position by the magnet 1, without interfering with the launch-lifting operations.

The use of the proposed fishing device provides the possibility of eliminating accidents in both cased and uncased wells traversed by rocks of any hardness. The use of the screen prevents the erosion of the walls of the well and reduces energy consumption during fishing operations.

Claims (2)

Claim 1. Borehole fishing device comprising a body with axial and radial holes, a flow shut-off unit and a screen with a radially displaceable body and opposite the radial hole of the body mounted in the body under the radial hole , characterized in that, in order to simplify the design of the device while reducing energy consumption in the production of fishing operations, on the outer surface of the housing under the radial of A chord-shaped notch is made opposite the screen, the inner surface of the screen is concave as part of a sphere, the screen and body being connected in the form of a hinge located in the upper part of the screen, and the longitudinal axes of symmetry of the groove-shaped notch, the screen and the axis of the radial hole are one vertical plane. 2. The device according to claim 1, about tl and is so that it is equipped with a magnetic retainer located in the wall of the housing opposite the screen 1 on the side diametrically opposite to the hinge of the screen. Aa eleven FIG. g 6-6 Fig.z about, Fig.C