RU2300697C1 - Device for batching reagent into pipeline - Google Patents

Abstract

FIELD: oil industry.

SUBSTANCE: device comprises pipeline, container, bent pipe for supplying liquid from the pipeline to the container, and pipe for supplying reagent that connects the container with pipeline. The open end of the bent pipe is set in the pipeline against the liquid flow. The container is positioned horizontally and receives the piston from the side of the bent pipe and bend from the opposite side of the container. The bend connects the container with the pipe for supplying reagent. Downstream of the bent pipe, the pipeline is provided with narrowing . The bottom end of the pipe for supplying reagent is connected with the pipeline downstream of the narrowing in the low-pressure zone. The container is provided with drain vale connected with the atmosphere and hopper connected with the vessel for batching the reagent. The bent pipe is provided with the connecting pipe provided with calibrated opening and mounted at the entrance to the container upstream of the piston and pipe for supplying reagent.

EFFECT: enhanced reliability.

1 dwg

Description

The invention relates to the oil and gas industry, in particular to devices for the dosed supply of liquid reagents in oil or gas pipelines, or wells.

A device for the dosed supply of a chemical reagent (RF patent No. 2161242, IPC 7 ЕВВ 37/06, F17D 1/16, published in bulletin No. 36 dated 12/27/2000), containing a container for a reagent with a hollow drain reagent line and a chamber gas accumulation, gas pipeline with differential pressure stabilizer. The stabilizer is made in the form of a separated partition with a calibrated hole in the upper part of the gas pipeline, and the partition is installed with the possibility of its forced movement at a distance that provides a constant column of reagent. The hollow drain reagent line is made in the form of a siphon. In the output part of the siphon, a partition with a calibrated hole is installed.

The disadvantages of this device are:

firstly, the complexity of the design, due to the large number of nodes and parts;

secondly, for a stable dosed supply of a chemical reagent, a certain amount of gas entering the gas storage chamber is required, which limits the scope of the device.

The closest in technical essence is a device for dispensing a reagent into a pipeline (RF patent No. 2163701, IPC 7 F17D 3/30, published in Bulletin No. 6 of 02.27.2001), containing a pipeline, a pipe for supplying liquid from the pipeline to a container with a flexible membrane adapted to fit to the walls of the container, while the open end of the tube for supplying liquid from the pipeline to the container is bent and placed along the axis of the pipeline against the fluid flow, a tube for supplying a reagent connecting the container to the pipeline, shutoff valves .

The disadvantages of this device are:

firstly, the dosed supply of the reagent to the pipeline is carried out by creating a pressure drop using a high-speed oil flow in the pipeline with reliable separation of oil and reagent in the container with a flexible membrane that can first break due to a sharp pressure drop and then collapse, which reduces reliability the operation of the device and ultimately leads to its failure;

secondly, there is no measured capacity for the reagent, in addition, the membrane is flexible and therefore it is impossible to control how much reagent was introduced first into the container and then into the pipeline.

An object of the invention is to increase the reliability of the device with the ability to control the dosed supply of the reagent into the container, and then into the pipeline.

The technical problem is solved by the proposed device for dispensing a reagent into a pipeline, containing a pipeline, a container, a curved tube for supplying liquid from the pipeline to a container, the open end of which is placed in the pipeline against the flow of liquid, a tube for supplying the reagent connecting the container to the pipeline, valves.

New is that the container is placed horizontally, and a piston is hermetically placed inside it from the side of the curved tube, and on the opposite side the container is equipped with a bend connecting it to the reagent supply pipe, while the pipeline behind the curved pipe is equipped with a narrowing, and the lower the end of the tube for supplying the reagent is connected to the pipeline for its narrowing in the zone of reduced pressure, while the container from the bottom in front of the piston is equipped with a bleed channel connected to the atmosphere, and above it is connected to the piston a narrow channel connected to a container serving for the dosed supply of reagents into the container, the curved tube at the inlet of the container in front of the piston and the pipe for supplying the reagent at the inlet to the pipeline are equipped with fittings with a calibrated hole.

The drawing schematically shows the proposed device in longitudinal section in the initial position.

A device for dispensing a reagent into a pipeline contains a pipeline 1, a container 2, a curved tube 3 for supplying liquid from a pipeline 1 to a container 2, a pipe for supplying a reagent 4 connecting the container 2 to the pipeline 1. The open end of the curved tube 3 is placed against the flow in the pipeline 1 liquids.

The container is placed horizontally, and inside it, from the side of the curved tube 3, the piston 5 is hermetically placed, and on the opposite side, the container 2 is equipped with an elbow 6 connecting the container 2 with the tube for supplying the reagent 4.

The pipe 1 behind the bent pipe 3 is equipped with a restriction 7 along the liquid flow, and the lower end of the tube for supplying the reagent 4 is connected to the pipe 1 for its narrowing 5 in the reduced pressure zone. The container 2 from the bottom in front of the piston 5 from the side of the curved tube 3 is equipped with a bleed channel 8 connected to the atmosphere, and from above behind the piston 5 - a loading channel 9 connected to a container 10 serving for dosed supply of reagents into the container 2. The container 2 behind the piston 5 has a certain volume - V, specified by the structural dimensions of the container 2.

The curved tube 3 at the inlet to the container 2 in front of the piston is equipped with a fitting 11 with a calibrated hole 12, and the tube for supplying reagent 4 at the entrance to the pipeline 1 is equipped with a fitting 13 with a calibrated hole 14.

Shut-off valves are made in the idea of valves 15, 16, 17, 18, moreover, valve 15 is installed in a bent tube 3, valve 16 is in the reagent supply pipe 4, valve 17 is in the bleed channel 8, valve 18 is in the charging channel 9.

The device operates as follows.

In the initial position, the valves 15 and 16 are closed, the valves 17 and 18 are open, while the piston 5 moves to the left towards the curved tube 3. This is because the bleed channel 8 is in communication with the atmosphere and, therefore, occurs in the container 2 in front of the piston 5 pressure drop to atmospheric (valve 15 is closed, and valve 17 is open), and behind the piston 5, the pressure corresponds to the sum of the pressures of the column of reagent in the feed channel 9 and the column of reagent in the tank 10 (valve 18 is open and valve 16 is closed), as a result of which pressure h and in front of the piston 5 in the container 2, which leads to the filling of the container 2 behind the piston 5 with a reagent of a certain volume - V (see drawing) from the tank 10.

At the end of filling the container 2, the valves 17 and 18 are closed and the valves 15 and 16 are opened, while the pressure in the pipe 1 decreases due to the restriction 7 opposite to the connection of the reagent supply pipe 4 to the pipe 1.

As a result, the fluid flow enters the open end of the bent tube 3 and reaches the nozzle 11 through the bent tube, where it enters the calibrated hole 12 of the latter and enters the container 2 into the space in front of the piston 15, causing the latter to move to the right (towards the tube for supplying reagent 4) . The movement of the piston 5 in the container 4 occurs due to the pressure drop in the pipe 1 between the open end of the bent tube 3 and the restriction 7 in the zone of reduced pressure (the junction of the lower end of the pipe for supplying reagent 4 with the pipe 1).

As a result, the piston 5 displaces the reagent located behind it in the container 2 through the elbow 6 and the tube for supplying the reagent 4 to the pipeline 1.

The speed of movement of the piston 5 in the container 2 depends on the diameter of the calibrated holes 12 and 14, respectively, the fittings 11 and 12 and the pressure drop in the pipeline 1, depending on the design dimensions of the restriction 7.

The flow rate of the reagent dosed into the pipeline 1 after narrowing 7 depends on the diameter of the calibrated hole 14 of the nozzle 13.

The diameters of the calibrated holes 12 and 14, respectively, of the fittings 11 and 13 are selected empirically.

The end of the dosed supply of volume V of the reagent from the container 2 to the pipeline 1 is indicated by the movement of the piston 5 in the container 2 to the extreme right position (towards the tube for supplying the reagent 4).

Next, the valves 15 and 16 are closed and the valves 17 and 18 are opened. As a result, the container 2 is re-filled with reagent from the tank 10, of a certain volume V, that is, the process is repeated (description above).

The proposed device allows to increase the reliability of the device due to the sealed installation of the piston in the container, and the dosed supply of the reagent to the container and then to the pipeline is controlled due to a certain filling volume of the container.

Claims (1)

A device for dispensing a reagent into a pipeline containing a pipeline, a container, a curved tube for supplying liquid from the pipeline to the container, the open end of which is placed in the pipeline against the flow of liquid, a tube for supplying reagent connecting the container to the pipeline, shutoff valves, characterized in that the container placed horizontally, and inside it from the side of the curved tube the piston is hermetically placed, and on the opposite side the container is equipped with a bend connecting it to the tube for supplying the reagent, The volume of the pipe behind the curved pipe is equipped with a constriction in the fluid flow, and the lower end of the reagent supply pipe is connected to the pipe for its constriction in the reduced pressure zone, while the container below the piston is equipped with a bleed channel connected to the atmosphere, and above the piston with a loading channel connected to a container serving for the dosed supply of reagents into the container, and the curved tube at the inlet of the container in front of the piston and the pipe for supplying the reagent at the entrance to the pipeline are equipped with fittings with a gauge oval hole.