SU800339A1 - Packer - Google Patents

Description

(54) PLKER

The invention relates to the oil industry and can be used to isolate a well interval when surveying absorbing formations when drilling wells.

A known packer containing a barrel with radial channels, a sealing element and a packing mechanism 1.

The disadvantage of the packer is the complexity of the design and the need to rise to the surface when changing the interval of the study.

Also known is a packer containing a hollow barrel with radial channels, sealing elements, an anvil ring and a cone, provided with shanks and forming a chamber connected to the barrel cavity and dies 2J with the barrel.

The packer has low performance, as it does not allow to investigate several layers in the well during one descent of the tool. To relocate the packer, it is necessary to lift it to the surface in order to replace the pins of the pins and drive the ratchet mechanisms to their original position.

The purpose of the invention is to ensure that the wellbore is repeatedly blocked during one descent of the packer into the well.

The goal is achieved in that the packer is provided with a yoke rigidly connected to the stop ring with windows for accommodating dies.

Figure 1 shows the packer in section;

0 in Fig. 2 is a section A-A in Fig. 1; on fig.Z - packer in the working position.

The packer consists of a hollow stem 1 with a sub 2 for connection

5 it with a drill string. On the body of the barrel 1 are placed the sealing elements 3, separated by an intermediate ring 4. The lower sealing element is limited by a stop ring 5,

0 screwed into the cage 6. In the windows 7 of the cage there are installed dies 8 connected by means of grooves 9 of the dovetail type with a cone 10. The cone is equipped with a sealing sleeve 11c with the shank 12. The retaining ring 5 is also provided with a sealing sleeve 13 with the shank 14. Camera 15 , formed by the shanks and the barrel, connected by a radical channel 16 of the barrel with

0

cavity 17 of the trunk, and through the nozzle l8 with annular space. A sleeve 19 is installed inside the barrel with a spring 20 with a saddle 21 under the ball 22, the spring 20 with its lower end rests against the step of the sleeve 23 connected to the sub 24.

Packer works in the following way.

The packer is lowered into the well on the drill string. Upon reaching the required interval in the well, a ball 22 is thrown into the drill string, which sits in the saddle 21 and overlaps the central channel 17, the cavity of the barrel. Then the flushing fluid is pumped, under the action of which the ball 22 with the sleeve 19 moves downward, compressing the spring 20 and opening the liquid access to the chamber 15 through the channel 16. Under the pressure of the fluid, the retaining ring 5 and the holder b, deform the sealing elements 3, move upward 8 along the cone 10 to engage with the borehole wall. Further, the weight of the drill pipe string creates a load, under the action of which the barrel 1 with the sub 2 moves downward, compressing the elastic sealing elements 3

and overlapping the annulus, the unpacking CL of the packer relieves pressure and tension, as a result of which the dies are released from engagement with the borehole walls and occupy the transport position.

Claims (2)

The invention of the Packer containing a hollow barrel with radial channels, sealing elements, a stop ring and a cone, provided with shanks and forming a chamber connected to the barrel cavity and dies, about 5 and 5 with the barrel in order to ensure that the well bore is repeatedly blocked during one descent The packer is fitted in the well with rigidly connected to the stop ring with windows for accommodating dies. Sources of information taken into account during the examination 1. Zaitsev Yu.V. Packers and flow diagrams of their installations. VNIIOENG, 5 M., 1969 p.98. 2. Patent US 3456723, ( cl. 166-120, pub. 1969 (prototype). 17 lfut.1 Aa iPui. i G7