RU65093U1 - DEVICE FOR REPAIR AND INSULATION WORKS IN A MULTIPLE HORIZONTAL WELL - Google Patents

Abstract

The device relates to the field of exploitation of oil and gas horizontal wells with several branches in the horizontal plane, namely, technical means.

The objective of the utility model is to ensure the use of grouting compositions with fillers and visco-plastic compositions and to expand the technological capabilities of the device for controlling its orientation during insulation works in multilateral wells with horizontal branching of trunks.

The proposed device for directed work in the branched trunk of a multilateral well consists of a housing 1, on which a sleeve 2 is mounted with two elastic support-centering bars 3 located on it and installed at an angle equal to the angle between the planes in which the main barrel and the lateral barrel are located , articulated coupling 4 for connection with the column of compressor pipes 5 and funnel 6.

The proposed device allows you to mechanically accurately fall into the branch from the horizontal trunk, in which it is planned to carry out insulation work, and without the use of telesystems used in the construction of multilateral wells, the use of which is expensive. The proposed device due to the presence of a hydraulic channel without any restrictions, gratings allows you to pump a viscous-plastic fluid into the well, including with fillers, which significantly improves the quality and efficiency of insulation work in branches from a horizontal well. 2 pf, 3 sheet fig.

Description

The device relates to the field of oil and gas horizontal wells with several branches in the horizontal plane.

A device for directional drilling by the rotary method (Overview. Series "Well construction". "Regulation of azimuthal curvature when drilling directional wells using non-directional BHA. Issue 1, Moscow 1989, pp. 48-49).

The device has a hollow shaft, supporting elements in the form of longitudinal strips on the rotation sleeve. The device has a control unit in the form of a plunger. The direction of the bottom of the drill string is fixed by pressure manipulations when pumping fluid.

The device is limited by the scope - namely, drilling of directional wells. It cannot be used for repair and insulation work in the well. It is difficult to pump the grouting fluid through this device and adjust the location of the open end of the pipe string.

The closest technical solution chosen for the prototype is a device that can be used for repair and insulation works in horizontal wells. (see USSR AS No. 613073, class E21B 7/08, from 1978).

The device consists of a housing, on the outer surface of which a deflecting element is installed, made in the form of centering strips of different heights.

This device can be used to pump grouting compositions into the branched trunk of multilateral wells in the following order. The layout with a downhole motor is oriented toward the branched trunk at a certain position of the linings relative to the lower wall of the trunk. Then the cement composition is pumped into the barrel, and the device rises from the well.

The given device in its application has a drawback - it is impossible to pump through the device as grouting compositions with fillers, as it can become clogged as well as visco-plastic compositions due to the possibility of high pressures.

The objective of the proposed utility model is to ensure the use of grouting compositions with fillers and viscous-plastic compositions and to expand the technological capabilities of the device for controlling its orientation during insulation works in multilateral wells with horizontal branching of trunks.

The problem is solved due to the fact that the device for repair and insulation work in a multilateral horizontal well, including a body, on the outer surface of which there is a deflecting element made in the form of strips of different heights, is equipped with a sleeve mounted on the body with two angles located on it elastic support-centering strips made of different heights and installed with the possibility of axial movement, while one end of the housing using a hinged clutch is connected to Ba tubing, and another - with the guide funnel, furthermore straps arranged at an angle equal to the angle between the planes in which are located the main trunk and a branch of it.

The inventive device is illustrated by drawings.

Figure 1 shows a General view of the device; figure 2 "a" is a section along AA, when the device is directed to the left of the main trunk; figure 2 "b" is a section along AA, when the device is directed to the right of the main trunk; figure 3 is a device used when working in a horizontal trunk, composed of low-strength rocks.

The proposed device for directed work in the branched trunk of a multilateral well consists of a housing 1 (Fig. 1), on which a sleeve 2 is mounted with two elastic support-centering bars 3 mounted on it, installed at an angle equal to the angle between the planes in which the main barrel and side barrel, articulated coupling 4 for connection with the column of compressor pipes 5 and funnel 6.

The device operates as follows.

A device (FIG. 1) is lowered into the well along the main trunk, which must be directed into the well drilled along a different path from the horizontal well. When descending in the main trunk, the device goes in contact with that side of the main horizontal trunk, where the additional trunk is drilled. When approaching the “fork”, i.e. to the transition to the branch from the main trunk, the device due to the deflecting action of the strips will ensure the movement of the column into it.

In ordinary practice, branches (additional trunks) from the main horizontal trunk are held at an angle of 90 ° or 120 °

When carrying out work in a horizontal trunk, carried out in low-strength rocks, in which there may be some abnormally extended intervals of the trunk. In such cases, several devices are included in the layout of the descent pipes (Fig. 3). The installation of several devices allows you to enter the funnel in the extended interval cutoff from the main trunk to the desired side trunk.

Thus, by adjusting the location of the support-centering slats, the funnel trajectory is determined.

The claimed device has several advantages over the known.

1. The proposed device allows you to mechanically accurately fall into the branch from a horizontal shaft, in which it is planned to carry out insulation work, and without the use of telesystems used in the construction of multilateral wells, the use of which is expensive.

2. The proposed device due to the presence of a hydraulic channel without any restrictions, gratings allows you to pump into the well a viscoplastic fluid, including fillers, which significantly improves the quality and efficiency of the insulating work in the branches from the horizontal trunk.

Claims (2)

1. A device for repair and insulation work in a multilateral horizontal well, comprising a body, on the outer surface of which a deflecting element is installed, made in the form of strips of different heights, characterized in that the device is equipped with a sleeve mounted on the body with two elastic supporting-centering slats made of different heights and mounted with the possibility of axial movement, while one end of the housing is connected to the pump-compressor using an articulated coupling quarrels, and the other with a guide funnel. 2. The device according to claim 1, characterized in that the planks are located at an angle equal to the angle between the planes in which the main trunk and the branch from it are located.