RU1816843C - Lubricator - Google Patents

Abstract

Usage: oil and gas production techniques, in particular, processes for servicing pressurized oil and gas wells, instruments and tools lowered on a geophysical cable. SUMMARY OF THE INVENTION: in a lubricator, the sealing element is made in the form of separate alternating elastic (13) and metal (14) rings having a conical cross-section, moreover, elastic rings (13) are made with the base of the cone to the center of the body (9), and metal rings

Description

Aa

22 ft

Ј

The invention relates to techniques for oil and gas production, in particular to processes for servicing pressurized oil and gas wells, instruments and tools lowered on a geophysical cable.

The aim of the invention is to increase the reliability of sealing of the geophysical cable due to more uniform wear of the elastic rings,

In FIG. 1 shows the proposed lubricator; FIG. 2 is a section AA in FIG. 1; in FIG. 3 - node I in FIG. 2.

The lubricator (Fig. 1) consists of a sealant 1, a receiving section 2, a trap 3 and a preventer 4. A geophysical cable 5 with a geophysical instrument (not shown) passes through the lubricator. The lubricator is installed on the wellhead 6 with a valve 7 through the adapter pipe 8.

The sealant has a housing 9, in the lower part of which an opening 10 is made for cable passage 5, and in the upper part there is an external thread for fastening the cover 1.1 with the hole 12. In the housing 9, elastic 13 and metal 1.4 rings are installed, separated by pressure sleeves 15 and 16 on the upper 17 and lower 18 group of rings 13 and 14. The bushings 15 and 16 are separated by a cavity 19 connected through an opening 20 in the housing 9 to a source of working fluid (not shown) under pressure. In the lower inner part, the housing 9 has a conical end 21. Between the cover 11 and the upper group 17 of rings 13 and 14, a sleeve 22 is installed, also having a conical end 23 at the point of contact with the elastic ring 13. A hole 24 is made in the sleeve 22 for cable 5 to pass. The pressure sleeves 15 and 16 have respectively conical ends 25 and 26 in contact with the elastic sleeves 13, The metal rings 14 have a cross section in the shape of a cone with a base to the walls of the housing 9. The elastic rings 13 also have a cross section in the shape of a cone with a base to the center of the body 9 Meta tallic ring 14 in contact with the elastic rings 13 on the conical surfaces 27. Moreover, elastic rings 13 are in contact with each other on the annular surface 28, an inner diameter d which is equal to the diameter of the cable 5 and the outer diameter D is equal to the inner diameter of the metal ring 14.

The lubricator is placed near the wellhead 6, the geophysical cable 5 is threaded into the hole 12 of the cover 11, the hole 24 of the sleeve 22, through the upper group 17 of elastic 13 and metal 14 rings, the holes of the pressure sleeves 15 and 16, the lower

a group of 18 rings 13 and 14, a hole. 10 of the housing 9 of the seal 1. After this, the head of the geophysical instrument is closed, the instrument itself is fixed. After that, the appliance plant t

into the receiving section 2 and the lubricator is assembled. The lubricator is installed on the wellhead 6 with a valve 7 through the adapter pipe 8. To lower the geophysical instrument into the well, open

a valve 7, a preventer 4 and a trap 3. Depending on the pressure in the well under one pressure or another, a working fluid is fed into the cavity 19 through the hole 20. When this clamping sleeve 15 conical

end 25 presses the upper group 17 of the rings 13 and 14 to the conical end 23 of the sleeve 22.

Similarly, the pressing sleeve 16 with a tapered end 26 presses the lower group 18 of the rings 13 and 14 against the tapered end 21 of the housing 9. In this case, the contact of each metal ring 14c with the elastic ring 13 occurs along the conical surface 27. Moreover, the extreme elastic rings 13

the upper group 17 are also pressed by the tapered ends 23 and 25, and the extreme elastic rings 13 of the lower group 18 are pressed by the tapered ends 26 and 21. In addition, the elastic rings 13 are in contact with each other along the annular surface 28. All this ensures that any point of the elastic rings is pressed 13 to the geophysical cable 5 with the same force, which allows reliable sealing of the cable 5.

After geophysical surveys, the device is lifted and the lubricator removed.

Based on the foregoing, we can conclude that the implementation of elastic

13 and metal 1.4 rings with a cross section of a conical shape, moreover, with the base of the cone of elastic rings 13 to the center of the housing 9 and with the base of the cone of metal rings 14 to the walls of the housing 9, as well as the execution of the elastic rings 13 in contact with each other along the annular surface 28 will ensure uniform pressing of each elastic points 13 to the geophysical cable 5. This is uniform

the pressing of the rings 13, in comparison with the prototype, will increase the sealing reliability of the cable 5 and the overall reliability of the lubricator.

Claims (1)

SUMMARY OF THE INVENTION A lubricator comprising a preventer, a receiving section and a sealant comprising a cylindrical body and a sealing element of a geophysical cable in the form of alternating elastic and metal rings, characterized in that. with the aim of increase the reliability of sealing of the geophysical cable due to more uniform wear of the elastic rings, metal and elastic rings are made with the outer double conical surface, moreover, in elastic rings the apex of the cone is directed to the axis of the body, and in metal to its periphery. Figure 1 Fie.Z