RU2747279C1 - Cemented liner hanger - Google Patents

Abstract

FIELD: oil industry.SUBSTANCE: invention relates to the oil industry and is intended for the arrangement of wells. The device includes a shoe, a check valve, a stop ring, a plug, a centralizer, a funnel, a disconnector. The plug consists of cuffs mounted on a rod. The centralizer includes upper and lower rings, spring bars. In this case, the shoe consists of a steel body and a drillable polymer insert. Flushing holes are made in the body. Bevels are made in the lower part of the body. The insert contains a check valve and a stop ring. The plug is made with the possibility of fixing in the stop ring. The plug has cuffs of different diameters. A tip, an O-ring and a retainer in the form of a split annular spring are installed at the lower end of the rod. The funnel has an internal thread at the top. A disconnector with a tubing is connected to the funnel by means of a thread.EFFECT: increasing the reliability of the device, simplifying it, ensuring tightness throughout the column.1 cl, 1 dwg

Description

The invention relates to the oil industry, is intended for the arrangement of wells.

The cemented liner hanger (PCH) is designed for running, hanger and sealing of the liner in the well with cementing, performing technological operations related to cementing and sequential actuation of the anchor and packer assemblies and subsequent disconnection of the transportation string and the liner.

Field of application of the device: vertical, inclined (flat) wellbores and boreholes with horizontal ends, into which liners (hidden casing strings) are lowered and cemented.

State of the art.

A device for cementing a liner in a well is known, including a liner with a funnel at the top and a pressure saddle at the bottom, a pipe string with a nipple made with the possibility of tight interaction with the liner funnel, a disconnector connecting the upper part of the liner and the lower part of the pipe string, a valve assembly connected with the lower part of the shank and consisting of the upper and lower bodies, in which two spring-loaded check valves are installed one above the other, and the funnel is equipped from the inside with an annular narrowing under the nipple and pins located above, the disconnector is made in the form of a hollow body located on the pipe string above the nipple, with the same external grooves for the funnel pins, the nipple is designed to be located below the annular narrowing of the funnel (RU 2425958 C1, 08/10/2011). This device has a complex design.

A device for cementing a liner in a well is known, including a liner with a funnel at the top and a pressure seat at the bottom, a pipe string with a nipple, a valve assembly with spring-loaded valves, and an annular groove is made in the funnel, and the disconnector is made in the form of a hollow body located on the pipe string above the nipple , with an annular constriction, in which radial windows are made, and a hollow bushing inserted into the annular constriction with the possibility of a tight movement limited by the stop and fixed with a shear element (RU 2431732 C1, 20.10.2011). This device also has a complex design and does not always provide the required tightness.

A cemented liner suspension is known, including a shoe, a check valve, a stop ring, a squeezing plug, a cleaning plug, a centralizer, a funnel, a disconnector, and the plugs consist of cuffs mounted on the rod, the centralizer includes upper and lower rings, spring strips (Technological regulations for casing of wells with a "liner" ø 102 mm using the installation tool VM.UI-114M.000 and technological equipment TGS-114.102.000 manufactured by JV CJSC UDOL, Izhevsk, 2014).

As the closest analogue, you can take the device according to (Technological regulations for casing wells with a "liner" ø 102 mm using the installation tool VM.UI-114M.000 and technological equipment TGS-114.102.000 manufactured by JV CJSC UDOL, Izhevsk, 2014) ...

A technical problem, typical for both the closest analogue and for other devices, is the complexity of the design, which creates additional costs in the construction of wells, and insufficient tightness.

A cemented liner hanger is offered, including a shoe, a check valve, a stop ring, a plug, a centralizer, a funnel, and a disconnector. The plug consists of cuffs installed on the rod, the centralizer includes upper and lower rings, spring bars. The shoe consists of a steel body and a drillable insert made of polymer, moreover, there are flushing holes in the body, bevels in the lower part of the body, and a check valve and a stop ring are installed in the insert. The plug consists of cuffs installed on the rod, with the cuffs of different diameters, and a tip, an O-ring and a retainer in the form of a split annular spring are installed at the lower end of the rod. The centralizer includes upper and lower rings, upper and lower shells; the funnel has an internal thread at the top.

The technical result is the reliability of the structure, its simplification, tightness throughout the column.

The device is illustrated in Fig., Where are indicated:

1 - shoe,

2 - cork,

3 - centralizer,

4 - funnel,

5 - disconnector.

Shank hanger includes:

Shoe pos. (Fig. 1) consists of a steel body and a drillable insert made of polymer (rimamide, polyamide), in which a check valve and a "stop ring" are installed. Flushing holes are made in the steel body, and bevels are made in the lower part.

Plug pos. 2 (Fig.) Consists of rubber cuffs, assembled on an aluminum rod and tightened with a nut. Attached to the lower end of the rod are a tip, an O-ring and a split annular spring retainer. The plug is necessary to push the drilling fluid and create a tightness in the string.

The spring centralizer pos. 3 (fig.) Is made of sheet spring steel and has only two welded seams - on the shells. The upper and lower rings prevent axial movement of the centralizer along the column pipe.

Funnel pos. 4 (fig.) Is a coupling with a tapered guide surface and a left-hand internal thread on top.

Disconnector pos. 5 (Fig.) Is a sub with an external left internal thread on top.

Operation of the cemented liner hanger.

The equipment is run into the well as part of the liner. A funnel is installed on the top of the liner, which will remain inside the casing. A disconnector with a tubing is connected to the funnel by means of a left-hand thread. Drill pipes are connected to the disconnector. A spring centralizer is used to center the shank. The shoe is mounted on the end of the suspension. A non-return valve and a "stop ring" are installed in the shoe.

After running the liner, the cement slurry is injected. After that, the squeezing plug is lowered. Under the pressure of the displacement fluid, the plug passes through the string of drill pipes and tubing, cleaning their inner surface from the cement slurry, and is compacted in the shoe, fixing itself in the "stop ring".

After the cement slurry has hardened by right-hand rotation, the drill pipes are disconnected from the hanger.

The uniqueness of the liner hanger, developed by the design bureau of the MC LLC "TMS Group", is as follows:

developed and applied in the manufacture of parts (proprietary technology),

use in the manufacture of polymer material (rimamide, polyamide),

combination of a check valve and a "stop ring" in one body,

simplicity and reliability of the design allows to reduce costs during well construction,

the plug has different diameters of the collars, which contributes to the tightness and cleaning throughout the string,

the presence of threaded connections, a limited number of structural elements facilitates assembly and disassembly.

Claims (2)

1. The liner hanger is cemented, including a shoe, a check valve, a stop ring, a plug, a centralizer, a funnel, a disconnector, and the plug consists of collars mounted on a rod, the centralizer includes upper and lower rings, spring strips, characterized in that the shoe consists of made of a steel body and a drillable insert made of polymer, moreover, flushing holes are made in the body, bevels are made in the lower part of the body, and a check valve and a stop ring are installed in the insert, the plug is made with the possibility of fixing in the stop ring, has cuffs of different diameters, and a tip, an O-ring and a retainer in the form of a split annular spring are installed at the lower end of the rod, the funnel has an internal thread in the upper part, and a disconnector with a tubing is connected to the funnel by means of a thread. 2. Cemented liner hanger according to claim 1, characterized in that the drillable insert is made of rimamide or polyamide.

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