RU2713281C1 - Shoe-valve for installation of expandable system in well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, namely to drilling of wells, in particular to devices for installation of expandable systems in isolation of zones of complications during drilling. Proposed device comprises housing with central pass channel made with external thread to be connected with expandable pipes, valve, seat and sleeve. Body has an internal thread located in the upper part of the central pass channel. Valve is made in the form of a quadrangular prism with a spherical surface interacting with the seat. Said seat is made integral with housing. Sleeve is screwed in internal thread of housing to limit valve stroke and has grooves. Number and width of the bush slots correspond to the number and width of the cutter blades providing for the flapping of the shoe-valve made of easily drilled polymer.

EFFECT: simplified design, increased reliability of operation with provision of disconnection and lifting of shoe-valve or drilling out immediately after flaring of extensible system in one lowering-lifting operation with minimum time costs, and also reduction of emergency situations in well.

1 cl, 5 dwg

Description

The invention relates to the oil and gas industry, in particular to the field of well drilling, in particular to devices for installing expandable systems when isolating zones of drilling complications.

Known shoe valve for installing an expandable system in the well (patent RU No. 2498043, IPC ЕВВ 29/00, publ. 04/10/2013 in bull. No. 31), comprising a housing with a central passage channel in which a hollow valve seat with transfer channels is located connected to the housing using a temporary destructible connection with the possibility of fixing in the upper working position by means of a spring clip and a tight shutoff of the transfer channels. In this case, the housing is threaded to the bottom of the expandable system, provided with a head for the fishing tool on top and radially displaced holes communicated with the central channel, as well as upper end protrusions for the lapel. At the same time, a protrusion coaxial with the valve seat is installed in the housing below the housing openings, which is made with the possibility of hermetically entering the seat cavity in the working position to block the transfer channels.

The disadvantages of the device are:

- a complex structure with a large number of parts reduces the efficiency and reliability of the shoe-valve;

- it is impossible to use the shoe-valve without focusing on the bottom of the well, which limits its use to isolate the zones of complications located above the current bottom;

- it is impossible to hook the shoe-valve with a fishing tool due to the fact that over the shoe-valve in the expandable system (profile pipes), a large amount of sludge is compacted (formation of sludge plug) and, therefore, drilling of the sludge plug with washing is required. Sludge plug is formed when using profile pipes, since during the expansion of profile pipes in the well, the scale exfoliates during the manufacture of profile pipes with multiple heat treatment, and the accumulation of sludge flowing into the expandable system when filling with borehole fluid;

- drilling a metal shoe-valve complicates the process of installing an expandable system in a well and increases the installation time of an expandable system in a well;

- the need for additional tripping with the use of special milling devices for the destruction of sludge plugs and shoe-valve.

The closest is a shoe-valve for installing an expandable system in the well (patent RU No. 58156, IPC ЕВВ 29/10, publ. 10.11.2006 in bull. No. 31), comprising a housing with a central passage channel made with external thread with the possibility of connection with expandable pipes, valve, seat and sleeve. Additionally, the shoe valve includes a ball valve and a retaining ring located in the annular groove. The sleeve is placed in the Central passage channel with the possibility of limited axial movement due to the pins located in the longitudinal grooves in the Central channel of the housing. On the inner surface of the sleeve is an internal thread. In this case, the annular groove of the retaining ring is made on the inner surface of the nozzle rigidly and coaxially mounted in the central passage channel above the sleeve.

The disadvantages of the device are:

- a complex structure with a large number of parts reduces the efficiency and reliability of the shoe-valve;

- the inability to disconnect and lift the shoe-valve, since when the shoe-valve is disconnected after expanding the expandable system at a high feed rate of the flare at the time of opening the shoe-valve, the thread in the sleeve is destroyed. As a result, there is a need for additional tripping operations with high time costs for drilling the shoe-valve with special tools. At the same time, it is impossible to drill the shoe-valve in one tripping operation due to the fact that the shoe-valve is made of metal;

- also the inability to disconnect and lift the shoe-valve, since when the thread of the flare is turned into the sleeve of the shoe-valve, the pins are cut and, as a result, an emergency occurs in the well;

- it is impossible to hook the shoe-valve with a fishing tool due to the fact that over the shoe-valve in the expandable system (profile pipes), a large amount of sludge is compacted (formation of sludge plug) and, therefore, drilling of the sludge plug with washing is required.

The technical objectives of the invention are to simplify the design, increase the reliability of the shoe-valve for installing an expandable system in the well, which allows to disconnect and lift the shoe-valve or drill immediately after expanding the expandable system in one round trip with minimal time, as well as reduce emergency situations in the well.

Technical problems are solved by a shoe-valve for installing an expandable system in a well, including a body with a central passage channel made with an external thread with the possibility of connection with expandable pipes, a valve, a seat, and a sleeve.

New is that the body has an internal thread located in the upper part of the central passage channel, the valve is made in the form of a quadrangular prism with a spherical surface interacting with the seat, the seat is integral with the body, and the sleeve is screwed into the internal thread of the body with the possibility of travel restriction the valve and is made with grooves, while the number and width of the grooves of the sleeve correspond to the number and width of the milling blades, providing the flap of the shoe-valve, while the shoe-valve is made of egkorazburivaemogo polymer.

In FIG. 1 shows the expansion process of an expandable system. In FIG. 2 flap of the shoe-valve. In FIG. 3 section AA. In FIG. 4 section BB. In FIG. 5 section BB.

A shoe valve for installing an expandable system in a well (not shown in FIG.) Includes a housing 1 (FIG. 1, 2) with a central passage 2 (FIG. 1). An external thread 3 is made on the housing 1 for connection with an expandable system — expandable pipes 4 (Fig. 1). In the housing 1 is made of an internal thread 5, located in the upper part of the Central passage channel 2 (Fig. 1). The valve 6 (Fig. 1, 3), located in the Central channel 2, is made in the form of a quadrangular prism with a spherical surface 7 interacting with the seat 8, made integral with the housing 1 (Fig. 1). The sleeve 9 (Fig. 1, 4) is screwed into the internal thread 5 of the housing 1 with the possibility of limiting the stroke of the valve 6 and is made with grooves 10. The number and width of the grooves 10 of the sleeve 9 correspond to the number and width of the blades 11 of the milling cutter 12, (Fig. 1, 2 , 5) providing the flap of the shoe-valve. Reducing the number of parts of the shoe-valve reduces the complexity in the manufacture of the shoe-valve, increases its performance and reliability.

The shoe valve is made of easily drilled polymer, for example, fiberglass, produced in accordance with GOST 10292-74.

The device operates as follows.

The shoe-valve is installed in the lower part of the expandable pipes 4 with an external thread 3 on the housing 1. During the descent into the well of expandable pipes 4 with a shoe-valve, the borehole fluid passes through the central channel 2 of the housing 1 of the shoe-valve, raising valve 6 with a spherical surface 7 from the seat 8. The movement of the valve 6 is limited due to the sleeve 9. In this case, the borehole fluid passes through the grooves 10 of the sleeve 9 of the valve shoe, filling the interior of the expandable pipes 4 (FIGS. 1, 2).

After the expandable pipes 4 reach the installation zones in the expandable pipes 4, an overpressure is created by supplying the flushing fluid with a drilling pump of any known design. At the same time, the pressure of the flushing fluid presses the valve 6 with a spherical surface 7 to the seat 8. Under the action of the valve 6, the expandable pipes 4 straighten out before being pressed against the walls of the well (not shown in the figure).

Next, lower the flare 13 (Fig. 1, 2) into the well, under the influence of which expandable pipes 4 are rolled to the walls of the well. Upon reaching the slurry plug 14, the flare 13 drills and flushes it with the help of a milling cutter 12 with flushing holes 15 installed from the bottom (Fig. 1).

Upon reaching the valve shoe, the rod 16 of the milling cutter 12 is screwed through the sleeve 9 into the valve 6 and the valve shoe body 1. Due to the fact that the valve 6 is made in the form of a quadrangular prism, the rotation of the valve 6 does not occur, which allows the flare 13 with a milling cutter 12, equipped with a shaft 16, to be freely screwed into the valve 6.

Upon reaching the blades 11 of the milling cutter 12 of the sleeve 9, the blades 11 enter the grooves 10 of the sleeve 9, and the valve shoe is disconnected (lapel) by an external thread 3. After that, the expandable pipes 4 are flared until the flare 13 comes out of the expandable pipes 4. the valve is held by the rod 16 of the milling cutter 12, after which the shoe shoe is lifted from the well.

If it is necessary to drill a shoe-valve, the milling cutter 12 is equipped with cutting elements 17. Due to the fact that the shoe-valve is made of easily drilled polymer, the drilling of the shoe-valve is carried out immediately after expanding the expandable system in one round trip operation with minimal time costs, while emergency well situation.

The proposed design of the shoe-valve for installing the expandable system in the well is reliable and simple, allowing to disconnect and lift the shoe-valve, in case of impossibility to disconnect - drilling the shoe-valve immediately after expanding the expandable system in one tripping operation with minimal time costs, as well as reducing emergency situations in the well.

Claims (1)

A shoe-valve for installing an expandable system in a well, comprising a body with a central passage channel, made with an external thread with the ability to connect a valve, a seat and a sleeve to the expandable pipes, characterized in that the body has an internal thread located in the upper part of the central passage channel , the valve is made in the form of a quadrangular prism with a spherical surface interacting with the seat, the seat is made integral with the body, and the sleeve is screwed into the internal thread of the body with the possibility of anicheniya valve stroke and is provided with grooves, while the number and width of the sleeve slots correspond to the number and width of the router blades provide shoe flap valve, wherein the valve shoe made of legkorazburivaemogo polymer.

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