RU1790665C - Device for location and fishing of parted pipes in well - Google Patents

Abstract

Usage: oil and gas industry. Fishing operations when pipe breaks in the well. SUMMARY OF THE INVENTION: a pipe depth gauge is made in the form of a flux gate and placed in the tube between the screens, the flux gate is made of loops. In the gap between the ends of which there is a gasket made of a material with increased magnetic permeability. The deflecting unit is made of a cone-shaped guide, deflecting movable element, a hydraulic cylinder and a moving device. 4 ill.

Description

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The invention relates to the oil and gas industry, in particular to fishing operations when pipes are broken in a well.

A device is known for determining the location of pipes in a well using cameras. The device includes a camera by which the location of the pipe break in the well is determined. The camera is lowered by pipes, fluid is replaced in the well, then raised to the surface. This method is not economical, because firstly, it is not always possible to get a clear picture, and secondly, it is required to make several approximate flights to the well, with the replacement of fluid in the well.

Closest to the present invention is a device for measuring the depth of pipes, consisting of a sealant, a counter, a carriage moving along the pipes, a centralizer. The device descends on a cable

into the well to the end of the dangling pipe string. After beating the depth, the device rises to the surface and the depth of the pipe break in the well is determined from the counter. After that, a fishing tool for catching dangling pipes is lowered.

The analysis of this prototype revealed its shortcomings: the great complexity of the work, obtaining data on the depth of the pipe arrangement, it is necessary to lower it into the well and raise the device to the surface, only after that you can lower the fishing tool. The disadvantages of this device include: the complexity of the design, the complexity of manufacturing and operation, high cost. In addition, the device (prototype does not give a complete picture of the location of dangling pipes.

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Therefore, the fishing tool can be idled without reaching the final goal, i.e. trapping broken pipes.

The aim of the invention is to increase the reliability and efficiency of fishing operations.

In FIG. 1 shows a layout of equipment; in FIG. 2 - deflecting unit; in FIG. 3 is a design of a flux gate; in FIG. 4 - location of the flux gate.

The device for determining the location and trapping of dangling pipes in the well (Fig. 1) consists of a fluxgate made in the form of a loop 1 located inside the tube 2 to which a deflecting unit 3 and a fishing tool (tube) 4 are attached. Above the fluxgate 1 is installed inside the tube an electronic unit 5 for measuring and converting the fluxgate signals and transmitting it to the surface, an electric separator 6 of the drill string, a turbogenerator 7 is installed in the upper part to generate electric energy. A drill string 8 is mounted on top of the pipe 2. A surface panel 9 is located on the surface, the poles of which are connected to the drill string 8 and ground 10.

To the lower end of the pipe 2, a deflecting unit 3 is fastened, which consists (Fig. 2) of a housing 11, in the upper part of which a cone-shaped guide 12, a deflecting movable element 13 is located. The latter is connected via a rod 14 to a piston-pusher 15 abutting against the spring 16. Outside is a cylinder 17 with rubber sealing rings. In the housing 11 there is an opening 18 below the piston pusher 15. The deflector assembly is connected to the pipe string and fishing tool by means of a coupling 19.

The flux gate 1 (Fig. 3) is made in the form of a loop consisting of rings 20 cut and elongated in the form of protrusions 21, in the gap between the ends there is a gasket 22 with a magnetic permeability greater than that of the loop. This is done in order to center the magnetic lines at the ends of the loop. A winding 23 is wound around a loop of rings 20 /

The flux gate 1 is placed inside the tube 2 (Fig. 4), which is the sensor screen, and screens 24 are also located at the top and bottom, and the ends of the loop are brought out of the tube 2. The flux gate 20 is connected to the ground equipment via cable 25.

The device operates as follows.

Before the device with the fishing tool is lowered into the well, calibration is performed with the metal of the dangling pipes and the readings are checked on the scale of the ground equipment, where constant indicators are fixed taking into account the screen of the flux gate.

After that, the layout is lowered (Fig. 1) of the fishing tool 4 with the deflecting unit 3 and the device. During the descent of the instrument, the readings on the scale of the panel 9 of the ground equipment will be

constant because there are no metal objects in the well. As the fishing tool 4 approaches the metal (broken pipe), the screen will increase due to the fact that when the fluxgate 1 device approaches the broken pipe, the magnetic permeability (s) of the loop core consisting of rings 20 changes, therefore, the EMF decreases , which is transmitted through the amplifier of the electronic unit 5 to the scale of the ground panel 9. The distance to the end of the broken pipe is determined by the value of the readings.

In order to determine the deviation of the dangling pipe in the well in order to reliably capture it with a fishing tool, it is necessary to rotate the drill pipes 8 with the tube 4 and the flux gate 1. When the flux probe 1 is rotated, the reading on the scale of the device increases or decreases.

When the protrusions 21 of the loop of the fluxgate 1 approach the deflected pipe located in the well, the permeability (/.)

will increase more and, consequently, the readings on the panel of the ground equipment will increase. In the case when it has been shown that the end of the dangling pipe is in the cavity and the pipe 4 cannot fit into the dangling pipe, a deflecting unit 3 is used for this and when pumping liquid into the pipes 8, pressure is created under the piston-pusher 15, which is conical in shape guide

12 raises the movable element 13. The latter, abutting against the wall of the well, deflects the fishing tool 4 in the opposite direction, and when the pipes 8 are rotated, the fishing tool 4 leads the end of the dangling pipe out of the cavity and at the same time captures it.

The technical and economic effect consists in increasing productivity and lowering material costs by reducing tripping operations while simultaneously determining the location of the end of the dangling column, its removal from the cavity and catching with a fishing tool.

Claims (3)

SUMMARY OF THE INVENTION 1. A device for determining the location and trapping of dangling pipes in a well, including a depth gauge for dangling pipes, a fishing tool and a deflecting unit, characterized in that, in order to increase the reliability and information content of fishing operations, it is provided with a pipe to which the fishing tool and the deflecting assembly are fixed, the depth gauge for dangling pipes is made of two screens installed in the pipe perpendicular to its longitudinal axis and placed between the screen mi a flux-gate installed with the possibility of interaction with axial Fi9.1 0 5 movements and rotations of the focused magnetic flux with the end of dangling pipes. 2. The device according to p. 1, characterized in that the flux gate is made in the form of a loop with a gasket of a material with a magnetic permeability greater than that of the loop located in the gap between its ends. 3. The device according to claim 1, characterized in that the deflecting unit is made of a cone-shaped guide, a deflecting movable element, a hydraulic chamber and a moving device located therein, connected by a link to the deflecting movable element. 1 7 J -I Figure 1