RU43909U1 - DEVICE FOR REGULATING LIQUID INJECTION IN LAYERS - Google Patents

Abstract

The proposal relates to the oil industry and may find application in the injection of water into injection wells, mainly to limit the injection of water into the lower reservoir. A device for controlling the injection of fluid into the reservoirs contains a packer comprising a mandrel and an elastic element connected to the packer bottom pipe and a throttling unit. The device is equipped with a landing tool in the form of a pipe and a support pipe connected from below to the mandrel, ending on top with a threaded sleeve, the pipes are interconnected by shear elements. The throttle assembly is installed in the sleeve of the support pipe and is made in the form of a nozzle muffled from above, in the lower part of which a fitting is rigidly mounted. Below the plug along the perimeter of the nozzle, channels are made connecting its internal space with the formation, and the channels are directed upwards to the axis of the device. The lower pipe is equipped with a cone rigidly fixed on it, below which a closed figured groove with longitudinal short and long sections is made on the outer surface of the lower pipe. A clip with a guide pin, which is placed in a figured groove, is installed on the lower pipe. On the cage along its circumference slips are installed, spring-loaded in the radial direction. The device is simple in design, reliable in operation and does not require significant material costs. The device provides reliable separation of layers and can be installed on any interval of the well without reliance on the bottom hole.

Description

The proposal relates to the oil industry and may find application in the injection of water into injection wells, mainly to limit the injection of water into the lower reservoir.

The closest in technical essence to the proposed one is a method for jointly-separate injection of a displacing agent (AS No. 909134, IPC E 21 B 43/20, publ. BI. No. 8 of 02.28.1982).

A device for implementing this method comprises a packer comprising a mandrel and an elastic element connected to the packer bottom pipe and a throttling unit. As the latter, a turbo engine is used.

A significant disadvantage of the device is that the turbo engine is a complex and expensive machine, in addition, it is characterized by low reliability and performance.

The objective of the utility model is to develop a device of a simplified design with high reliability and installed in any interval of the well without bearing on the bottom.

This problem is solved by the proposed device containing a packer, including a mandrel and an elastic element connected to the packer bottom pipe and a throttle assembly.

New is that the device is equipped with a landing tool in the form of a pipe and a support pipe connected from the bottom to the mandrel, ending on top with a threaded sleeve, the pipes are interconnected by shear elements; the throttle assembly is installed in the sleeve of the support pipe and is made in the form of a nozzle muffled from above, a fitting is rigidly mounted in the lower part, and channels connecting its internal space with the formation are made below the nozzle perimeter, the channels being directed upwards to the device axis; the lower pipe is equipped with a cone rigidly fixed on it, below which a closed figured groove with longitudinal short and long sections is made on the outer surface of the lower pipe, while a clip with a guide pin is installed on the lower pipe,

which is placed in a figured groove, and on the cage along its circumference slips are installed, spring-loaded in the radial direction.

Figure 1 shows the upper part of the proposed device in longitudinal section, lowered into the well.

Figure 2 shows the lower part of the proposed device in longitudinal section, lowered into the well.

Figure 3 shows a scan of the shape of the curly groove of the lower pipe of the device.

The device consists (Fig. 1) of a landing tool, a throttling unit and a packer.

The landing tool is a pipe 1, which is connected to the tubing string 2 from above and from the bottom to a support pipe 3, in the coupling of which a throttling unit is installed, made in the form of a nozzle 4 with a plug 5 and a nozzle 6. Below the plug, the channels are made around the nozzle 7 directed up to the axis of the device. The support pipe 3 is connected to the mandrel 8, below which an elastic sleeve 10 is mounted on the packer body 9. The packer body 9 with an annular step 11 is included in the support sleeve 12 of the lower pipe 13. The lower pipe 13 is provided with a cone 14 rigidly fixed thereto. Below the cone 14 on the outer surface of the lower pipe 13 a closed figured groove 15 is made (see FIG. 2) with longitudinal short 16 and long 17 sections (see FIG. 3). Outside, a clip 18 is mounted on the lower pipe 13 with a guide pin 19, which is placed in a figured groove 15 (see Fig. 1). On the cage 18 along its circumference slips 20 are mounted, spring-loaded in the radial direction. The pipe 1 with the sleeve support pipe 3 and the annular ledge 11 with the support sleeve 12 are connected respectively with shear elements 21 and 22; 23 - high permeability formation, 24 - low permeability formation.

The device operates as follows.

The device on the tubing string 2 is lowered into the well so that the packer is above the lower low-permeability formation 24, while the guide pin 19 is placed in the longitudinal short section 16 of the figured groove 15.

After that, the device is raised by about 1 meter and lowered again, as a result of the guide pin 19 is moved to a long section 17 (see figure 3) of the figured groove 15 (see figure 2), since the spring-loaded slips 20 are in contact with the casing wall 25, fixing a clip 18 with a guide pin 19 relative to it. As a result, all parts of the device except for parts 18, 19 and 20

move relative to them down. In this case, the cone 14 comes into contact with the slips 20, compressing their gear part to the wall of the casing 25.

Then the tool is partially unloaded, the shear elements 22 are destroyed and the mandrel 10 under the load (the weight of the tubing string 2) falls down to the stop of the annular ledge 11 in the lower part of the sleeve 12, while the mandrel 8 expands and tightly presses the elastic sleeve 10 against the wall of the casing 25 .

Produce additional unloading of the tool, while the shear elements 21 are destroyed, after which the tubing 2 and the planting tool 1 are raised to the surface. The well is ready for water injection. Water is pumped through the casing or through the tubing string, lowered to the upper highly permeable formation 23. The diameter of the passage channel of the nozzle 6 is set so that the water is pumped into both layers 23 and 24 in the optimal mode, according to their reservoir characteristics and production conditions layers.

The device is simple in design, reliable in operation and does not require significant material costs. The device provides reliable separation of layers and can be installed on any interval of the well without reliance on the bottom hole.

Claims (1)

A device for regulating fluid injection into formations containing a packer, including a mandrel and an elastic element, a lower pipe connected to the packer and a throttling unit, characterized in that it is equipped with a landing tool in the form of a nozzle and a support nozzle connected from the bottom to the mandrel, ending with a sleeve with threaded, pipes are interconnected by shear elements; the throttling unit is installed in the sleeve of the support pipe and is made in the form of a nozzle which is muffled from above and the fitting is rigidly mounted at the bottom, and channels connecting its internal space with the formation are made along the nozzle perimeter; the channels are directed upwards to the device axis; the lower pipe is equipped with a cone rigidly fixed on it, below which a closed figured groove with longitudinal short and long sections is made on the outer surface of the lower pipe, while a clip with a guide pin is placed on the lower pipe, which is placed in the figured groove, and on the clip around its circumference installed slips, spring-loaded in the radial direction.