RU119021U1 - BORE DOSING DEVICE - Google Patents

Abstract

1. Downhole dispensing device containing a container with a reagent, a filter, a bypass device in the lower part of the container, a separator-float with the ability to move along an axis inside the container when the reagent is consumed, a nozzle in the upper part of the container, characterized in that a shank is installed below the container. ! 2. The downhole metering device according to claim 1, wherein the bypass device is installed in a ring located between the container and the liner in a sleeve connection.

Description

The utility model relates to the oil industry, namely, to downhole oil processing.

A well-known installation working due to the cyclic extension of the tubing string is used for downhole oil processing (see A.S. SU No. 894178, ЕВВ 43/00, published December 30, 1981).

The disadvantages of this device are the low efficiency due to the inability to use a reagent of lower density, rapid failure when the plunger pair is skewed or mechanical impurities are introduced.

A well-known dosing device containing a container with a reagent, a filter to prevent mechanical impurities, a bypass device, a float separator installed with the possibility of movement along the axis inside the container when the reagent is consumed, the bypass device is located in the lower part of the container, and in the upper part there is a nozzle with hole (see RF patent No. 49572 ЕВВ 43/00 published on November 27, 2005).

The disadvantage of this device is the low reliability of the design due to the possibility of damage to the overflow device on the casing in the intervals of intensive set of curvature during tripping.

Another disadvantage of this device is the change in the initially set dose of the reagent due to changes in the pressure drop in the transfer device as the reagent is consumed, since the reagent is replaced by well products with varying water cut.

The specified downhole dosing device by technical essence is closest to the proposed downhole dosing device, and it can be taken as a prototype.

The objective of the utility model is to increase the reliability of the design of the transfer device while maintaining a constant dose of reagent supply for the entire period of operation of the downhole dosing device.

The stated technical problem is solved by the described downhole dosing device containing a container with a reagent, a filter, a bypass device in the lower part of the container, a float separator with the ability to move along the axis inside the container when the reagent is consumed, an nozzle in the upper part of the container.

A distinctive feature of the claimed utility model is that a shank is installed below the container, and a transfer device is installed in the ring located between the container and the shank in the sleeve connection. Thus, an increase in the reliability of the design of the bypass device is achieved while maintaining the dose of supply of the reagent for the entire period of operation of the downhole dosing device.

Figure 1 shows a longitudinal section of the proposed device.

The downhole dispensing device comprises a bypass device 1, mounted in the ring 2 by welding, located between the container 3 and the shank 4 in the sleeve connection 5. The bypass device 1 is a valve designed to replace the reagent with well products in the cavity of the container 3 as it is consumed. The shank 4 is a string of tubing about 50 m long. Inside the container 3, in its lower part, a float separator 6 is installed, to which a rubber seal 8 is attached by means of a nut 7 with the possibility of movement together with the float-separator 6 along the axis inside container 3. Separator-float 6 with seal 8 are designed for separation of different-phase liquids. A filter 10 with openings is connected to the upper part of the container 3 by means of a sleeve 9. A nozzle 11 with a hole in the center is welded to the inner surface of the filter 10.

Downhole dosing device operates as follows.

After assembling the metering device at the wellhead and refueling the container 3 with reagent, it is lowered into the well on the tubing string.

During the operation of the sucker rod pump, a vacuum is created inside the filter 10, while the well products are sucked through the openings of the filter 10 and at the same time the reagent through the nozzle 11. As the reagent is consumed in the cavity of the container 3, it is replaced by the well products through the bypass device 1. In this case, moving the float separator 6 with the rubber seal 8 up. Shank 4 serves as a reservoir of oil released from the reservoir fluid, therefore, when reagent is consumed, only oil enters the cavity of the container through the bypass device 1. Since most of the reagents used have a density close to the density of oil, the pressure drop in the bypass device 1 remains constant, and, therefore, the reagent consumption also remains constant. The presence of a liner 4 eliminates damage to the bypass device 1 about the casing in the intervals of intensive set of curvature during tripping.

Thus, the proposed downhole metering device has a high reliability design of the bypass device while maintaining a constant dose of reagent for the entire period of operation of the downhole metering device.

Claims (2)

1. A downhole dosing device containing a container with a reagent, a filter, a bypass device at the bottom of the container, a float separator with the ability to move along the axis inside the container when reagent is consumed, an nozzle in the upper part of the container, characterized in that a shank is installed below the container. 2. The downhole dosing device according to claim 1, characterized in that the bypass device is installed in the ring located between the container and the shank in the sleeve connection.