RU91738U1 - DEVICE FOR DIVIDING LAYERS IN A WELL - Google Patents

Abstract

A device for separating the layers in the well, containing connected pipes, the end sections of which are upset in their middle part, and the upset sections are provided with closed rims, the hollows between which are filled with a sealing compound, characterized in that the pipes are connected by welding, and one of the pipes is corrugated , playing the role of an anchor during inflation and interaction with the walls of the well, and the remaining pipes are made cylindrical, while the sealing composition is made in the form of rubber elements.

Description

Device for separation of formations in a well. The proposal relates to the oil and gas industry and is intended for separation of formations in a well.

There is a method of separating the layers in the well with a profile cutter (a.s. No. 907220, IPC ЕВВ 33/12, publ. Bull. No. 7 of 02.23.82), including profiling of its constituent pipes with the formation of longitudinal corrugations (folds) and cylindrical ends, settling these ends of the pipes to the diameter of the described circumference of their profile part, filling the corrugations (folds) in the cavities with sealant, screwing the pipes and lowering the overlap to the required interval of the well, radial expansion of the overlap to the diameter of the well in the interval of its installation and flaring. The disadvantages of the device used in the method are:

- the complexity of manufacturing shaped pipes and, as a result, high material costs;

- when the overlap expands with pressure from the inside, the convex parts of the corrugations by touching the well wall prevent the sealant from spreading around the overlap, as a result of which it is squeezed out in longitudinal directions along the corrugation cavities, leaving depressurized sections, as a result of which the tightness and reliability of the separation of the layers are not ensured;

- extrusion and leaching of sealant due to exposure to fluid from the reservoir during water development or exposure to flushing fluid during well drilling.

The closest in technical essence and the achieved result is a method of separating the layers in the well with a profile cutter (patent RU No. 2083798, IPC ЕВВ 33/12, published July 10, 1997), including a device for separating the layers in the well, containing profile pipes connected by a thread, equipped with cylindrical end sections, which are externally deposited in its middle part and filled with a sealing compound.

The disadvantages of this device are:

- the complexity of manufacturing shaped pipes and threads on them and, as a consequence, high material costs;

- extrusion and leaching of sealant due to exposure to fluid from the reservoir during water development or exposure to flushing fluid during well drilling.

The technical task of the proposed device is to reduce material costs due to the simplification of the design, reducing time and efforts for expansion, increasing the reliability and tightness of the separation of layers using the proposed device.

The technical problem is solved by a device for separating the layers in the well, containing connected pipes, the end sections of which are upset in their middle part, the upset sections being provided with closed rims, the hollows between which are filled with a sealing compound.

What is new is that the pipes are interconnected by welding, one of the pipes being corrugated, playing the role of an anchor during inflation and interaction with the walls of the well, and the remaining pipes are cylindrical, while the sealing composition is made in the form of rubber elements.

In Fig.1, a device with an axial section in the interval of its installation in the well; in Fig.2 a device with an axial section after radial expansion; figure 3 is a section aa.

A device for separating the layers 1 (see Fig. 1) in the well 2, contains connected pipes 3. The end sections 4 of the pipes 3 are upset in their middle part, and the upset sections 5 are provided with closed rims 6, the cavities 7 between which are filled with sealing rubber elements 8 The pipes 3 are made cylindrical and interconnected by welding 9. One of the pipes 3 'is made corrugated with the possibility of interaction with the walls of the well 2 in the interval of the installation 10 during inflation after descent.

The device operates as follows.

After examining the installation interval 10, determine the area in this interval 10, where the rocks are less prone to destruction (the diameter in this area is constant and without caverns). Next, the device is assembled at the mouth, connecting the cylindrical pipes 3 constituting it, and the profile pipe 3 'is inserted so that it falls on a previously defined section of the installation interval 10. The end sections 4 of the pipes 3 are upset in their middle part, and the upset portions 5 are provided with closed rims 6, the cavities 7 between which are filled with sealing rubber elements 8. To reduce material costs, the pipes 3 are not profiled, that is, left cylindrical. Pipes 3 and 3 'are connected to each other by welding 9. The complete assembly is lowered into the necessary previously extended interval 10 of the well 2 on the drill pipe string, for example, with a flare (not shown in FIG.). In this case, the end sections 4 of the pipes 3 are respectively above the disjoint formation and below. The device is fixed in this interval 10 of the well 2 with the anchor 3 '(Fig. 1 is shown below) blowing the corrugated pipes 3' until it is pressed against the walls of the well 2. Next, the device is radially expanded, for example by flaring, until the rubber elements 8 are pressed against the walls well 2 (see figure 2 and 3). Due to the fact that the sealing elements are made of rubber, their extrusion and leaching due to exposure to liquid from the reservoir during water development or exposure to flushing fluid during well drilling is excluded. Due to the fact that closed rims 6 are located between the rubber elements 8, during the descent, the contact of the rubber elements 8 against the borehole wall 2 is eliminated, and when the device is expanded, the rims 6 are introduced into the borehole wall 2. Thus, the reliability and tightness of formation separation are increased. And due to the fact that pipes 3 do not profile, but use cylindrical ones, and are connected together by welding 9, a significant reduction in the cost of manufacturing and use of the device occurs, without requiring additional effort to straighten and calibrate the profiled sections, with the exception of a small portion of the corrugated pipe - the anchor 3 '.

The proposed device has a simple design, which reduces the time and effort for flaring and increases the reliability and tightness of the separation of layers.

Claims (1)

A device for separating the layers in the well, containing connected pipes, the end sections of which are upset in their middle part, and the upset sections are provided with closed rims, the hollows between which are filled with a sealing compound, characterized in that the pipes are connected by welding, and one of the pipes is corrugated , playing the role of an anchor during inflation and interaction with the walls of the well, and the remaining pipes are made cylindrical, while the sealing composition is made in the form of rubber elements.