SU1677261A1 - Apparatus for cementing wells - Google Patents

Abstract

The invention relates to the mining industry and is used in casing cementing. The goal is to increase the reliability of the device. The device includes a housing 1, inside of which are placed the upper 2 and lower 4 stops. The upper stop 4 has a hole 3. On the lower stop 4 is placed a package of magnetic disks consisting of a base 5, a head 6, magnetic disks 7, spacer rings 8 and a clip 9 that tightly encloses the magnetic disks 7. The package of magnetic disks is axially displaced and cover the holes 3 in its upper position. The guide rods 10 are rigidly connected to the lower end of the upper stop 2. The base 5 and the head 6 are installed respectively in the lower and upper parts of the package of magnetic disks. Spacer rings 8 are placed between the magnetic disks 7. The package of magnetic disks is assembled into a single unit using a core 11 connected by a lower end with a lower stop 4, and an upper end with a head 6. The outer diameter of the holder 9 is equal to the outer diameter of the spacer rings 8. Guide rods 10, the base 5, the head 6, the frame 11, the clips 9 and the spacer rings 8 are made of a diamagnetic material. Magnetic disks are turned towards each spacer with poles of the same name. When cementing casing, the device is installed at the bottom of the well. Before pumping the cement slurry in the reverse direction, a ferromagnetic powder is introduced into its first batch. When a portion of the cement slurry is reached with the ferromagnetic powder of the device, it interacts with the magnetic field of the device and with the flow of the solution the magnetic disks together with the head rise to the upper position, and the opening 3 closes. 2 Il. About VI VI chae o

Description

The invention relates to the mining industry, and more specifically to the oil and gas industry, and can be used in the cementing of casing strings in wells, both directly and in the reverse direction.

The purpose of the invention is to increase the reliability of the device.

Figure 1 shows the device, a general view; figure 2 - node 1 in figure 1.

The device includes a hollow body 1, an upper abutment 2 with an opening 3 and a lower abutment 4 installed inside the housing 1. On the lower abutment 4 there is a package of magnetic disks consisting of a base 5, a head

b, magnetic disks 7, spacer rings 8 and holders 9 tightly covering magnetic disks 7. The package of magnetic disks is installed with the possibility of axial movement and blocking the holes 3 of the upper support in its upper position; The guide rods 10 are rigidly connected with the lower end of the upper support 2 Base 5 and head 6 are installed respectively in the lower and upper part of the magnetic disk pack. Spacer rings 8. Fitted between the magnetic disks 7. (The magnetic disk is assembled into a single unit using a core 11 connected by a lower end to a lower stop 4, and an upper end to a head 6. The outer diameter of the sleeves 9 is equal to the outer diameter of the intermediate rings 3. The guide rods 10 , the base 5, the head 6, the skeleton 11, the holder 9 and the spacer rings 8 are made of a diamagnetic material.To each spacer ring 8 adjacent magnetic disks are turned with the same poles.

The geometrical dimensions of the package of magnetic disks (magnetic disks and its components) are chosen so that the main part of the Magnetic Flux closes along the circuit: magnetic disk - spacer ring - gap - Housing - gap - spacer ring - Magnetic disk.

The device works as follows.

When cementing casing strings in the reverse way, a ferromagnetic powder is introduced into the first portion of the cement slurry, and the device itself is placed in the lower part of the casing string. When pumping the solution at the moment when the first batch of cement mortar comes in with the ferromagnetic powder, the latter interacts with the magnetic field of the device and moves the package of magnetic disks to the upper position, while the opening 3 of the upper disk 2 closes. On the surface, an increase in pressure is detected to the device area. The cementing process is completed and after 03 C

proceed to further work.

In direct cementing, the ferromagnetic powder is injected into the last portion of the cement slurry, and during the injection of the cement slurry

record the volume of the squeeze fluid equal to the internal volume of the casing, and record the pressure parameters. After the cement mortar has been pushed, a pressure surge indicates

completion of the operation.

Claims (1)

The invention The device for cementing wells, comprising a hollow body, an upper abutment with a hole and a lower abutment installed inside the body, a package of magnetic disks placed on the lower abutment and mounted with the possibility of axial movement and blocking the upper abutment hole in its upper position, in order to increase the reliability of the device, it is provided with guide rods rigidly connected to the lower end of the upper stop, the base and the head, installed respectively in the lower and upper parts of the magnetic disk pack, spacer rings placed between the magnetic disks, the clips tightly covering the magnetic disks, and a skeleton connected by a lower end with a lower stop, and an upper end with a head on which the magnetic disk pack is fixed, while the outer diameter of the sleeve is equal to the outer diameter of the spacer rings, and the guide rods, base, head, frame, holders and spacer rings are made from diamagnetic material, with magnetic disks facing each spacer ring with poles of the same name. Fig-t Fig2