SU670721A1 - Plugging device - Google Patents

Description

(54) SPRAY BLADE

The invention relates to the field of drilling wells, in particular, to devices for isolating zones of complications traversed by using drilling drums with removable core receiver.

A grouting device is known, which includes a housing with a glass diaphragm at the bottom and a weight rod suspended at the top of the screen.

The disadvantage of this device is the small volume of the cement mixture transported to the well.

Closest to the invention is a cement plug, comprising an outer and an inner pipe string and a packer with an elastic sealing element mounted on the barrel.

However, the known device cannot be used in drilling shells with removable core receivers due to the inability to provide sealing of the affected space due to the small deformation capacity of the packer sealing element. In order to ensure sealing, it is necessary to remove the outer string of pipes and use packers along the borehole diameter, which requires a considerable amount of time and certain current dimensions of the packer.

The aim of the invention is to increase the reliability of sealing the annular space without lifting the outer pipe string and to ensure that it is possible to use a flexible inner column.

This is achieved by the fact that the barrel of the packer and the section of the sealing element is made of vertically installed elastic metal plates, elastic

0 plates are arranged concentric in two rows with displacement between them by half their width, the inner surface of the outer column of pipes is provided with supporting lugs, the inner pipe is made 5 with slots, the barrel of the packer is equipped with collets installed with the possibility of their interaction with the supporting lugs of the outer column through internal tube cuts.

0

FIG. 1 shows the grouting device; in fig. 2 - the same in the working position.

Snar d includes concentrically located outer / and inner 2

5 pipe columns and a packer with an elastic sealing element 3 mounted on the barrel; the barrel of the packer 4 at the site of the sealing element is made of vertically installed elastic metal plates 5. In the working position, the gaps between the plates can be so large that it is possible for the sealing element to leak . In order to eliminate this, the plates are mounted concentrically in two rows with displacement between them by half the width of the plate.

When using the inner flexible tubing string, the packer barrel is mounted with limited longitudinal movement in the inner tube and provided with collets 6, and through the lower end of the inner pipe, which is made in the form of a metal tip 7, are made through longitudinal slots 8. 9, an auxiliary device 10 is installed over the sealing element of the packer. An aperture 11 is made in the packer barrel through which one of the components of the mixture is delivered. The mixture of components enters the wellbore through an opening 12 above the support 13.

The projectile is operated as follows.

If it is necessary to carry out the isolation work, the column set (removable core receiver) from the drill pipe string 1 is raised below the face of the value determined by the length of the interval being worked. An appropriate length is chosen and the support 13, which, together with the packer, including the barrel with elastic plates 5 on the inner 2 string of pipes, is lowered into the well. When the bearing 13 contacts the bottom of the well and when the internal column 2 is loaded, the sealing element 3 is brought into working position by the bending of the plates 5, in which it comes into contact with the walls of the well, reliably blocking the annulus.

In the case where the inner tube is flexible, when the support 13 contacts

the borehole internal column continues to move down relative to the packer barrel until the collet 6 through the longitudinal slots 8 enter into 5 interaction with the protrusions 9. The further reduction of the sealing element 3 is carried out by pressure transmitted through the outer / pipe.

Then, one of the components of the cementing sludge is delivered through the inner tube 2 and the barrel 4, and the other through the channel between the tubes Y and 2 and the hole 11 in the packer barrel. The mixture components exit to the well through a hole 12.

Claims (3)

1. Cementing d, including concentrically located outer and 0 an internal pipe string and a packer with an elastic sealing element mounted on the barrel, characterized in that, in order to increase the reliability of sealing the annulus without 5 lifting the outer pipe string, the packer barrel in the area of the sealing element is made of vertically mounted elastic metal plates. 0 2. A snapshot according to claim I, characterized in that the elastic plates are arranged concentrically in two rows with an offset between them by half of their width. five 3. A snapshot according to claim 1, characterized in that, in order to enable the use of a flexible inner column, the inner surface of the outer string of pipes is provided with supporting lugs, the inner tube is slotted, and the packer barrel is provided with collets installed with the possibility of their interaction with the support lugs of the outer column through the slots of the inner tube.