SU759703A1 - Hydraulic packer sleeve - Google Patents

Description

The invention relates to oil and gas industry, namely to the cuff hydraulic packers used to isolate stem portions during drilling, fastening, sampling, testing and repairs zhine ₅ into the well.

The cuff of a hydraulic packer is well-known, consisting of individual sections placed on a rod, connected along the entire length by elastic tubes, which are stretched along the entire package of sections through coaxial holes arranged in them [1].

A disadvantage of known sleeves is the presence rotatably its sections relative to one another, which may occur when the destruction of the elastic tube, whereby no stable operability cuff ¹⁵ will be provided during the operation in the borehole.

The closest technical solution known to this is the cuff of the hydraulic packer, consisting of 20 elastic cylindrical sections placed on the rod with longitudinal channels and end fittings made in the form of discs and sleeves [2].

2

Known cuff is equipped with rigid rods placed inside the elastic tubes, which creates inconvenience during ex-. cuff cutaway.

When packing, the known cuff is compressed in the axial direction and stretches in the radial direction. When unpacking the cuff is not fully returned to its original position due to residual deformations and its length is reduced.

Due to the fact that the length of the rigid rods remains the same, and the length of the cuff is reduced, a gap is formed in the joints between the sections.

Violation of the joint between the sections contributes to their turning relative to each other. This can lead to the destruction of the elastic tubes connecting the sections in the package. In addition, the gaps in the joints between the sections can be blocked in the well by mechanical inclusions, which at the next packing will prevent the sections from closing together, which also contributes to the breaking of the elastic tubes and the cuff failure.

Thus, this cuff is not reliable enough in operation.

· '“--- · з -. 759703

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

This is achieved due to the fact that the disks of the connecting fittings of the cuff are made with grooves that communicate between Himself the longitudinal channels of the sections, and

'btyh ..... channels from one end zaglu ..... shena. ’

FIG. 1 shows a cuff in a transport position, a longitudinal section of FIG. 2 - section A — A in FIG. one. ________'

The cuff of the hydraulic packer consists of elastic elements placed on the stem 1.

..... cylindrical sections 2 with longitudinal

axial channels 3, and some of them, for example channels 4, are made deaf on one side. Deaf channels are made in sections in order to increase the reliability and operability of the cuff due to the unloading of the most intense of its lower part, working at the maximum pressure drop. They can be of any configuration. Almost all channels of section 2 can be plugged with the exception of two. Each sec "" CI has an end fitting, made in the form of discs 5 and sleeves 6.

The disks are made with grooves 7, which communicate with each other the longitudinal channels of sections 2. Each section is interchangeable, which makes it possible to replace it in ...... case of failure and allows you to assemble a cuff of any desired length from sections. The stem 1 of the cuff has threads at the ends ’′ for connecting pipes to it.

Cuff hydraulic packer works as follows ... ,,

four

The cuff is lowered into the well on the pipes in the complete set of the formation tester or any other tool, depending on the type of work that needs to be done in the well. The exact pressure created in the tubes of hut ₅ is transferred to the cavity B and through the bypass channels 8 and 9 in the disks 5 and bushings 6 and the groove 7 - in. channels 3 and 4. Under the action of pressure, the elastic sections of the 2 cuff expand to their tight contact with the borehole wall.

Due to the distinctive features of the proposed cuff, the reliability of its operation in the well is significantly increased, the design of the cuff is simplified, and consequently, its operation is facilitated, i.e. assembly and disassembly.

Claims (1)

Claim The cuff of the hydraulic packer, consisting of ₂₀ straps of elastic cylindrical sections placed on the rod. longitudinal channels and end fittings made in the form of discs and sleeves, characterized in that, in order to increase the reliability of the cuff, the dies are made with grooves that communicate the longitudinal channels of the sections, with some of these channels being plugged at one end.