RU2451156C1 - Drilled bottom-valve for installation of reamed string in well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device includes housing with central through channel tightly inserted and fixed in lower end of reamed string made in the form of metal connection pipe. The channel is equipped with hollow cylindrical insert with untight plug from above, inside of which ball valve is arranged with possibility of axial movement. Metal connection pipe is designed with possibility of rigid connection, for example by welding to reamed string. Plug is inserted into hollow cylindrical insert, which upper part is above the housing. Lower part arranged in the housing is provided with annular grooves from outside. Above the housing there is cylindrical platform installed, it seals the space between metal connection pipe and upper part of cylindrical insert. Housing external surface contacting to outside environment is covered with sealant.

EFFECT: improving reliability, simplifying the design and reducing the manufacturing costs.

1 dwg

Description

The proposal relates to the oil and gas industry, in particular to the field of well drilling, in particular to expandable columns to isolate areas of drilling complications.

The well-known "Profile overlap" (patent PM No. 64262, IPC E21B 29/10, publ. Bull. No. 18 dated 06/27/2006), including a profile pipe with cylindrical end sections, in the head of which the anchor assembly is located, and in the tail - a shoe mounted above the rolling end section and made in the form of a liner with a seal around the perimeter and the conical surface below, made with the possibility of interaction with the rolling shank of the profile pipe, and the shoe bottom is equipped with a removable latch that interacts with the lower end of the tail ovik profile pipe.

The disadvantages of this device are:

- low efficiency of the device when using cement for the shoe body, associated with the saturation of cement with water and its subsequent destruction due to the lack of a cement sealant from the environment;

- the complexity of the design due to the use of the embedded element for fixing the latch;

- the lack of a valve to fill the profile overlap when it is lowered into the well.

A device is known “Shoe for installing a profile overlap in the well” (patent PM No. 56454, IPC E21B 29/10, publ. Bull. No. 25 of 09/10/2006), including a housing made with the possibility of connection with the shutoff, with a central passage a channel, a seat and a ball valve, while on the outer surface of the casing there is an annular selection and annular protrusions located above, respectively, for connecting to the overlap and for sealing this connection, and the central channel above the saddle, rigidly connected to the casing, is equipped with a hollow a cylindrical insert with internal longitudinal channels, inside of which a ball valve is located with the possibility of axial movement, and the housing is made of easily drilled material.

The disadvantages of this device are:

- low efficiency of the device when using cement for the shoe body, associated with the saturation of cement with water and its subsequent destruction due to the lack of a cement sealant from the environment;

- after the destruction of the shoe body, it is necessary to use a tool to destroy or remove the seat and ball valve made of metal.

An object of the invention is the creation of a reliable drillable shoe-valve that can withstand high pressures when using expandable columns, is easy to manufacture and use, which eliminates the additional material costs of manufacturing and additional tripping operations for its destruction.

The technical problem is solved by a drilled shoe-valve for installing an expandable column in a well, including a hermetically inserted and fixed in the lower end of an expandable column made in the form of a metal pipe, a body with a central passage channel equipped with a hollow cylindrical insert with an unpressurized plug on top, inside of which with the possibility axial displacement is a ball valve, and the metal pipe is made with the possibility of rigid connection, for example, by welding with expansion scraped column.

What is new is that the plug is inserted into a hollow cylindrical insert, the upper part of which is located above the housing, and the lower part located in the housing is equipped with ring grooves from the outside, while a cylindrical platform is installed on top of the housing, which seals the space between the metal pipe and the upper part of the cylindrical insert moreover, the outer surface of the housing in contact with the external environment is covered with sealant.

The drawing shows a drillable shoe valve for installing an expandable column with an axial longitudinal section.

Drill shoe valve for installing an expandable column in the well includes a hermetically inserted and fixed in the lower end of the expandable column, made in the form of a metal pipe 1, a housing 2 with a central passage channel 3, equipped with a hollow cylindrical insert 4 with an unpressurized plug 5 on top, inside of which axial displacement is located ball valve 6. The metal pipe 1 is made with the possibility of rigid connection, for example, by welding 7 with an expandable column. The plug 5 is inserted into the hollow cylindrical insert 4, the upper part of which is located above the housing 2, and the lower part, located in the housing 2, is equipped with ring grooves 8 on top. A cylindrical platform 9 is installed on top of the housing 2, which seals the space 10 between the metal pipe 1 and the upper part of the cylindrical insert 4 by the cuff 11. The outer surface 12 of the housing 2 in contact with the external environment (not shown in the drawing) is covered with sealant.

The device operates as follows.

The assembly assembly is welded to the bottom of the expandable column 1 by welding 7 and lowered into the well, while using the valve 6 in the cylindrical insert 4, the shoe and expandable column 1 are filled. Next, the column is expanded with hydraulic pressure, while valve 6 sits in the saddle 13 of the cylindrical insert 4. Due to the fact that the housing 2 is equipped with a sealing pad 9, the liquid does not come into contact with the housing material, such as cement, and does not destroy it. And also due to the platform 9, the load from the hydraulic pressure of the liquid is distributed evenly over the upper part of the housing 2. Due to the fact that the outer surface 12 of the housing 2 in contact with the external environment is covered with sealant, contact of the material of the housing 2 with the external environment is excluded, and, as a result , its destruction is excluded. After installing the expandable column, it is expanded by a flare mill with a milling head (not shown in the drawing). Upon reaching the shoe, a flare tool equipped with a milling head from below destroys the shoe and all its parts, which are made of easily destructible material, for example, PCB.

The proposed drilled shoe-valve is reliable in operation, can withstand high pressures when using expandable columns and is simple to manufacture and use, eliminating the additional material costs of manufacturing and additional tripping operations for its destruction.

Claims (1)

Drill shoe valve for installing an expandable string in a well, including a hermetically inserted and fixed at the lower end of the expandable string, made in the form of a metal pipe, a body with a central passage channel equipped with a hollow cylindrical insert with an unpressurized plug on top, inside of which axially displaceable is located a ball valve, and the metal pipe is made with the possibility of rigid connection, for example, by welding with an expandable column, characterized in that that the plug is inserted into the hollow cylindrical insert, the upper part of which is located above the housing, and the lower part, located in the housing, is equipped with ring grooves from the outside, while a cylindrical platform is installed on top of the housing, sealing the space between the metal pipe and the upper part of the cylindrical insert, and the outer surface the case in contact with the external environment is covered with sealant.