RU1810500C - Device for establishment of well gravel packed filter - Google Patents

Abstract

SUMMARY OF THE INVENTION: The packer barrel and the disconnect portion are rigidly interconnected. The bypass assembly is made with a movable sleeve with side holes and a shear sleeve, and the disconnect assembly is made with a bypass coupling with side holes mounted on the lower part of the stem. The movable sleeve is equipped with a spring retainer that rigidly fixes it with the overflow clutch and ensures their joint movement upward, as well as further disconnecting the overflow clutch and rigidly fixes the movable sleeve in the upper position relative to the cylindrical body when it enters the groove of the sub, b or.

Description

The invention relates to the oil and gas industry, namely gravel injection equipment, and is used to remedy disadvantages such as sand removal from the formation to form sand plugs.

The purpose of the invention is to increase the reliability of the device,

In Fig.1 shows a device lowered into the well, Fig.2 - the bypass node of the device in an enlarged view; - Fig.Z - an enlarged section of the bypass node; Fig. 4 is a bypass assembly after removing the disconnect assembly; Fig. 5 is a sectional view of the bypass assembly after removing the disconnect assembly; figure 6 - slotted filter of the device during the washing process.

The device consists of a pushing sleeve 1. shear screws 2, sleeve 3, grip 4, the upper part 5 of the rod 20, slipse, barrel 7, cuff 8, shear screws 9, sub 10. half ring 11. spring retainer 12, cylindrical body 13, bypass clutch 14, movable sleeve 15. shear element 16, shear sleeve 17, slit filter 18, ball 19, rod 20 and sealing elements for sealing individual cavities.

The device operates as follows;

The device is lowered into the borehole on the tubing (see Figs. 1; 2, 3) in order to pressurize the packer inside the tubing. This pressure through the opening A enters the annular space, the pushing sleeve 1 moves downward under the influence of pressure. At the same time, the cuff 8 is clamped, securing it with the slot 6. For communication of the annulus with the annulus. inside the tubing, the pressure increases.

Under the action of the overpressure, shear elements 16 are cut off on the shear sleeve 17. The latter moves downward and ensures that the tube space communicates with the annulus.

After that, the device is ready for injection of gravel.

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Gravel is pumped by water (carrier) with a special pump into the ICT. The injected gravel passes through the side openings B of the overflow clutch 14, the movable sleeve 15, the cylindrical body 13 and fills the formation zone between the production string and the slot filter 18. After the gravel is pumped, to remove the disconnecting assembly, the ball 19 is dropped into the ICT string, closing central aisle. When pressure is created in the tubing, the screws 2 are cut off, the collar 3 moves down to the stop, the gripper 4 enters the annular groove of the sleeve 3 and releases the barrel 7.

When lifting the disconnecting unit, the movable sleeve 15 (see, Fig. 4; 5) connected by a spring clip 12 with a bypass clutch 14 closes the holes B on the cylindrical body 13 and the end of the movable sleeve 15 abuts against the shoulder of the sub 10, the spring clip 12 expands and falls into the groove of the sub 10, rigidly fixing the movable sleeve 15 relative to the cylindrical body 13. The spring clip 12 releases the bypass clutch 14 and the disconnect assembly is ready to be removed.

The device is fully operational.

The packer recovery process is carried out using a tubing. The inner part of the barrel 7 is gripped by pulling upward. The shear elements 9 are cut off, the barrel 7 relative to the sub 10 receives a certain stroke, the half ring 11 abuts against the upper shoulder of the sub 10, after which the sleeve 8 is returned to its original position.

During prolonged use, the slot filter 18 of the device becomes clogged. To wash it inside the filter 18, pipes 21 are lowered (see Fig. 6), through which the liquid is pumped in the center, washing is carried out (the movement of the liquid is indicated by arrows).

The device can be used in both vertical and deviated wells.

The proposed device for creating

Claims (1)

downhole gravel filter increases the reliability of its operation, allows to reduce the overhaul period of the well. SUMMARY OF THE INVENTION Device for creating a downhole gravel filter, including a slotted filter, a disconnecting unit in the form of a rod with a radial hole in the upper part, a sleeve installed in the upper part of the disconnecting unit with limited axial movement, a bypass unit in the form of a cylindrical body with side holes, a varnish containing a barrel with cuffs and a push sleeve above the cuffs, characterized in that, in order to increase reliability in operation, the bypass assembly is made with a movable sleeve with side holes and a shear sleeve, located respectively on the inner and outer sides of its qi a cylindrical housing, and the disconnecting unit is made with a bypass coupling with side holes mounted on the lower end of the rod and a grip connecting the upper part of the rod of the disconnecting unit to the packer barrel, while the upper part of the rod of the disconnecting unit is placed with the formation of a cavity with the pushing sleeve, hydraulically external space bypass the assembly is installed between the filter and the bypass clutch, and the latter is in the working position fixed by a fixing shear element with a movable sleeve and its side holes are aligned with the side holes of the movable sleeve and the cylindrical body of the bypass assembly, and the fixing element is made in the form of a spring clip for rigidly fixing the movable sleeve in the upper position relative to the cylindrical body when disconnecting the bypass coupling, Fig.Z