SU1604988A1 - Packer - Google Patents

Abstract

The invention relates to the mining industry and is intended to segregate the trunk. The goal is to increase the reliability of the packer in directional wells by providing the possibility of eliminating spontaneous disturbances during descent. The packer includes a housing 1, a barrel 2 rigidly connected with it with a radial channel 3. On the latter, a packer 4 is installed and a piston 4 is located for the correlating 5. The packer has a sealing cuff 6 with a support ring 7. On the outer surface of the cuff 6 there is a movable protective sleeve 8 and a junction assembly. The piston 4 has shear elements 13 placed in longitudinal grooves 14 made on the outer surface of the barrel 2. On the inner surface of the cuff 6, an annular groove 15 is formed, which forms a cavity 16 filled with a viscous fluid and filled with a viscous liquid. the piston 4 moves upwards and acts on the ring 7, creating an axial force on the cuff 6. It is released from the sleeve 8 and is compressed in the axial direction, simultaneously increasing in the outer diameter. The increase in force on the cuff 6 leads to an increase in pressure in the cavity 16. At the same time, the volume of viscous fluid in the cavity 16 remains unchanged. The cavity 16 changes its hermetic shape in the radial direction, providing reliable radial expansion of the cuff 6. 1 Il.

Description

The invention relates to the mining industry, in particular to devices for separating a well bore.

The aim of the invention is to improve the reliability of the packer in directional wells by providing the possibility of excluding spontaneous coring during descent.

The drawing shows the packer, a general view. The packer includes a housing I, which by means of a thread is rigidly connected to the barrel 2 with the radial channel 3. On the barrel 2 are installed the packer 4 and the piston 6, which seals 5 pistons, sealing the cuff 6 with the support ring 7. On the outer surface of the cuff 6 there is a movable protective sleeve 8 and a knot for juggling, including the lower 9 and upper 10 cones and the clips 12 connected by an elastic ring 11.

The protective sleeve 8 is rigidly connected to the coring piston 5, and the packer piston 4 has shear elements 13 placed in longitudinal grooves 14 made on the outer surface of the barrel 2. On the inner surface of the cuff 6 there is an annular groove 15, which forms a sealed hole 2 with the barrel 2. a cavity filled with a viscous fluid 16. For fixation of the elements 4 and 5 in the upper and lower positions after they have been triggered in the body of the protective sleeve 8 and in the upper part, stops are installed

17 and 18.

Packer works as follows.

The packer is lowered into the well on tubing (tubing) to the desired depth. Below the packer section in the tubing overlap. Then they create an initial pressure, which through the radial bore 3 of the barrel 2 acts on the pistons 4 and 5. However, the piston 4 is kept from moving upwards by the shear elements 13. The piston. 5, having no restrictions, moves downward under the action of pressure while simultaneously driving the sleeve 8 connected to it. The latter serves as a reliable

protection of the sealing cuff 6 from all sorts of damage in the process of lowering the packer in a directional well.

0 The piston 5 continues to move down to the stop in the upper cone 10. The stroke of the movement of the piston 5 and the protective sleeve 8 exceeds the height of the packer-cuff 6 and the latter is released from the sleeve 8.

The pressure in the lift tubes gradually rises and the piston 5, acting on the upper cone 10, pushes it onto the slips 12, which, overcoming the force of the elastic ring 11, move evenly along

0, the lower cone 9, both axially and radially, begins to penetrate the teeth into the production string. When this occurs, the packer is centered in the production string, which is very important in the conditions

directional wells, where the packer in the initial position practically lies on the inner surface of the column.

With a further increase in pressure, a cut of the previously calculated elements 13 occurs, after which the piston 4 begins to move upwards, which, acting on the ring 7, creates an axial force on the cuff 6. It, released from the sleeve 8, begins to compress in the axial direction, simultaneously increasing Come in 45 outer diameter. When the packer cuff 6 is compressed in the hermetic annular cavity 16, a pressure of a viscous fluid begins to increase, which is proportional to the axial force on the sealing cuff 6. The specified pressure acts evenly 50 on all walls, including in the radial direction, evenly unclamping the cuff 6k. inner surface of the column. An increase in the axial force on the cuff 6 leads to a further increase in pressure in the cavity 16, while the volume of the fluid viscous 55 remains unchanged, the cavity changes its sealed shape in the radial direction, ensuring reliable radial expansion of the packer cuff 6.

From the moment the elements 13 are cut, the piston 5 simultaneously moves downward and the piston 4 upwards. When the calculated packing pressure is reached, the movement of both pistons is stopped and their working position is fixed by the stoppers 17 and 18.

Claims (1)

Invention Formula A packer comprising a body, a barrel rigidly connected to it, with a radial channel on which the packer is installed, And by the correlating pistons, a sealing cuff with a support ring, on the outer surface of which there is a movable protective sleeve and knotting unit, characterized in that, in order to increase the reliability of the packer in directional wells, the possibility of eliminating spontaneous knocking during the descent is ensured, the protective sleeve is rigidly connected to the matching piston, the packer piston and shear elements, and the barrel is made with longitudinal slots on the outer surface for placing the latter in them, wherein an annular groove is formed on the inner surface of the sealing cuff, which forms an air-tight cavity filled with a viscous liquid.