RU2467154C1 - Anchoring packer - Google Patents

Abstract

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil and gas industry and serves to lock, seal and protect equipment in the well against high pressure. Proposed packer comprises expanding branch pipe lowered on string with lower contraction and upper circular expansion and seal arranged there between, on outer surface of said branch pipe. Mandrel with expanding cone, seat and valve is arranged in upper expansion and tightly pressed against expanding branch pipe. Said mandrel is made from easy-to-drill material and furnished with limiter arranged above seat and valve. Expandable branch pipe has lower annular expansion with bottom contraction below said seal made from easy-to-drill material and jointed with lower expansion to allow detachment in interaction with mandrel. Said seal is composed of annular glands regularly spaced apart. Said mandrel is provided with sealing glands above expanding cone. Diameter of said glands should be smaller than or equal that of branch pipe annular expansions. Faces of said glands may be provided with self-sealing flanges.

EFFECT: higher reliability.

3 cl, 2 dwg

Description

The invention relates to the oil and gas industry and is intended for fixing equipment in the well, in particular expandable systems, as well as to means for sealing the production casing and protection against high pressure.

The well-known "hydraulic Anchor" (patent RU No. 2337231, IPC E21B 23/00, publ. Bull. No. 30 dated 10.27.2008), containing a hollow body connected to the column, communicated from the inside with the pipe string is hermetically sealed with an elastic sleeve connected by the ends with the body and provided with a concentric transition adapter inside, made with the possibility of limited axial movement relative to the body, while the cuff is located inside the body, on which longitudinal grooves provided with anti-seals are made between the ends of the elastic cuff, conductive elastic sleeve with inside and outside ends of the elastic sleeve on the body are made internal stops, the transit adapter is designed as a hollow sleeve with the outer stops on the ends of which interact outside of the cuff elastic respective internal abutments of the housing.

The disadvantages of this device are:

- to fix equipment using this anchor, it is necessary to constantly maintain high pressure in its cavity and pipe string or use a valve that blocks the passage section and holds the anchor in the working position;

- to separate the production casing together with the anchor, it is also necessary to use a packer, which significantly increases the cost of the equipment lowered into the well;

- repeated anchoring of the device can lead to fracture of the working bodies made of metal due to alternating loads, which can lead to jamming of the device in the well.

The closest in technical essence and the achieved result is “Packer” (patent RU No. 2215864, IPC E21B 33/12, publ. Bull. No. 31 dated 10.11.2003), including the upper and lower hollow pipes lowered on the tubing string. enclosures, an expandable nozzle attached to the end of the lower case with a sealing element placed on its outer surface in the form of an elastic shell, a mandrel installed in the housing, and a hydraulic chamber, while the expandable nozzle is made with an outer annular protrusion, above which the anchor is located the second section with serrated notches, and under it there is a sealing element, the upper part of which contacts the conical surface of the annular protrusion, and its lower end is made in the form of a dovetail and in a compressed state is placed in a centralizer cup fixed to the end of the lower case, its mandrel is equipped with a removable valve, made hollow and two-stage and placed in the upper case with the possibility of jamming by the second stage in the area of the annular protrusion of the expandable pipe when it is installed, and the hydraulic the chamber is formed by a housing, mandrel cavities with a valve and tubing.

The disadvantages of this device are:

- reduced flow area due to fixed mandrel after installing the packer;

- the difficulty of removing the device from the well due to the need for preliminary engagement with a special device and lifting the mandrel to relieve the interference between the anchor element of the packer and the production string.

The technical task of the invention is the creation of an anchor packer for fixing equipment in the well, in particular expandable systems, as well as for sealing small violations of the production string and its protection from high pressure.

The technical problem is solved by an anchor-packer, including an expandable nozzle lowered on the pipe string with a lower restriction and an upper annular extension, between which there is a sealing element located on the outer surface of the expandable nozzle, a mandrel with an expanding cone, seat and valve located in the upper extension with a sealed pressing to the expandable branch pipe.

New is that the mandrel, made of easily drilled material, is equipped with a stop above the seat and valve, the expandable nozzle below the sealing element is equipped with a lower annular extension with a lower restriction made of easily drilled material and connected to the lower extension with the possibility of detachment when interacting with the mandrel and the sealing element is made in the form of annular cuffs installed in series with a certain distance, and the mandrel is equipped around the perimeter above the expanding nusa sealing cuffs.

Also new is the fact that the diameter of the cuffs of the sealing element is less than or equal to the diameter of the annular extensions of the expandable nozzle.

Also new is the fact that the sealing cuffs at the ends are equipped with self-sealing collar elements.

Figure 1 shows the anchor-packer in the production casing with an axial section in the transport position.

Figure 2 shows the anchor-packer in the production casing with a cut after punching and removing the mandrel.

The anchor packer includes an expandable nozzle 2 lowered on a pipe string 1 (Fig. 1) with a lower restriction made in the form of a passage shoe 3 and an upper annular extension 4, between which a sealing element 5 is located, located on the outer surface 6 of the expandable nozzle 2. The mandrel 7 with an expanding cone 8, a seat 9 and a valve 10 is placed in the upper expansion 4 with a tight seal against the expandable nozzle 2. The mandrel 7, made of easily drilled material, is equipped with a stopper 11 above the saddle 9 and the valve 10. Expandable nozzle 2 below the sealing element 5 is equipped with a lower annular extension 12 with a passage shoe 3 made of easily drilled material and connected to the lower extension 12 with the possibility of detachment when interacting with the mandrel 7. The sealing element 5 is made in the form of annular cuffs 13 installed in series with a certain distance Dorn 7 is equipped around the perimeter above the expansion cone 8 with sealing cuffs 14. The diameter of the cuffs 13 of the sealing element 5 may be less than or equal to the diameter of the annular extension s 4 and 12 of expandable sleeve 2. The sealing cuff 13 at the ends are equipped with self-sealing collar 15 elements.

The device operates as follows.

The hydromechanical anchor packer is lowered on a drill pipe string or expandable pipe 1 into a well (not shown). The passage shoe 3 is used to direct and freely lower the device into the well. In this case, the filling of the device and the pipe string 1 occurs through the saddle 9 of the mandrel 7 and the stopper 11. After the anchor-packer is lowered into the required interval of the production string (EC) 16 or the uncased part of the well (not shown in the drawing), a pressure drop over the mandrel 7 is injected with fluid through the pipe string 1. At a certain pressure drop, the mandrel 7 moves downward, expanding the expandable pipe 2 by the cone 8. In this case, the cuffs 13 installed in series are pressed against the wall of the EC 16 or the uncased part of the well. When the mandrel 7 reaches the shoe 3, the shoe 3 and the mandrel 7 are pushed to the bottom of the well, after which, if necessary, they are destroyed and removed by washing the well. When sealing small violations of the production string, pipes 1 are disconnected (Fig. 2) from the expanded pipe 2, for example, along the left-hand thread, and the expanded pipe 2, located opposite the EC violation, seals the violation. When using the anchor packer to fix the expandable pipes, the pipes and, if necessary, the anchor packer are expanded in any known manner. Due to the fact that the mandrel 7 is equipped with sealing cuffs 14, it is possible to create the necessary pressure difference for the movement of the mandrel 7. Due to the fact that the diameter of the cuffs 13 of the sealing element 5 can be less than or equal to the diameter of the annular extensions 4 and 12 of the expandable pipe 2, the cuffs 13 are protected from interaction with EC wall or uncased part of the well. Due to the fact that the sealing cuffs 13 at the ends are equipped with self-sealing collar elements 15, the hydraulic break pressure increases when using the anchor packer to seal the EC.

An anchor packer allows you to fix equipment in the well with a slight decrease in the flow area, in particular, expandable systems, as well as to seal small violations of EC and its protection from high pressure.

Claims (3)

1. An anchor-packer, including an expandable nozzle lowered on a pipe string with a lower restriction and an upper annular extension, between which there is a sealing element located on the outer surface of the expandable nozzle, a mandrel with an expanding cone, a seat and a valve located in the upper expansion with hermetic pressing to the expandable nozzle, characterized in that the mandrel, made of easily drilled material, above the seat and valve is equipped with a stop, the expandable nozzle below the sealing element Shchen lower annular extension of the lower constriction made of legkorazburivaemogo material and connected with the lower extension is releasably interacting with the mandrel and the sealing member is formed as a series arrangement with a certain distance annular cuffs, the mandrel is equipped on the circumference above the spreading cone sealing cuffs. 2. Anchor-packer according to claim 1, characterized in that the diameter of the cuffs of the sealing element is less than or equal to the diameter of the annular extensions of the expandable pipe. 3. The anchor packer according to claim 1, characterized in that the sealing cuffs at the ends are equipped with self-sealing collar elements.

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