RU126365U1 - DEVICE FOR DOSING REAGENT TO WELL - Google Patents

Abstract

1. A device for dispensing a reagent into a well, including a reagent tank installed in the well below the pump unit and divided into two cavities by a spacer element, a small diameter pipeline, characterized in that it comprises a loading device installed at the wellhead, three eccentric inlet couplings, the first eccentric inlet sleeve is installed above the pump unit in the tubing cavity, the second eccentric inlet sleeve is installed below the pump unit in the upper part of the reagent tank , the third eccentric inlet sleeve is installed in the lower part of the reagent tank, when dividing the tank into the upper chamber for the reagent and the lower chamber for the produced fluid, the first sleeve contains a check valve and a control valve, the second sleeve contains a check valve and an adjustable fitting, the third sleeve contains two check valves and a control valve, in the first sleeve the check valve is connected to the control valve and is hydraulically connected through a small diameter pipe to the first check valve of the third sleeve, in the third The second check valve is connected to the control valve, the control valves of the first and third couplings and the check valve of the second coupling are hydraulically interconnected with the loading device by means of a small diameter pipe, and the first sleeve also contains a filter through which the produced fluid from the tubing enters through a small diameter pipe into the container. 2. A device for dispensing a reagent into a well, including a reagent tank installed in the well below the pump unit and divided into two cavities

Description

The invention relates to the oil and gas industry, in particular, to devices for the dosed supply of a chemical reagent into a well in order to prevent and remove asphaltene-tar-paraffin deposits (paraffin deposits), inorganic salts, corrosion, well demulsification.

The closest is a device for supplying reagent and water to the bottom of the well, including a tank for reagent, dispenser, armored hose, non-return valve, shut-off element, loading device. The reagent tank is connected to the downhole pump nozzle, the reagent is fed into the tank through the loading device through an armored hose, and the dosing of the reagent is carried out through the dispenser, with which the necessary dosing of the reagent is supported [A. 802526 USSR, ЕВВ 43/00, 1981].

The disadvantage of this device is the need for selection of the reagent by density and the creation of a column of liquid to displace the reagent from the dispenser, since the dispenser is gravitational type.

The closest is a device for introducing a chemical reagent into the well [Patent No. 2387808, ЕВВ 37/06, 2010], which includes a dispenser installed below the pump unit and made in the form of a container divided by a piston into two cavities - the lower one for the reagent, the upper one for the produced one fluid, a distributor and a channel for supplying produced fluid from the tubing string to the upper cavity. The channel can be made in the form of holes or pipelines of small diameter. The reagent is introduced into the well by extrusion by a piston under the influence of excess pressure created by the produced fluid supplied to the upper cavity.

The disadvantage of this device is the need for tripping to fill the tank with reagent.

The objective of the utility model is a device that provides uninterrupted supply of reagent of any density, which does not require constant maintenance and tripping operations to fill the tank with reagent.

The problem is solved in that the device for dispensing the reagent into the well, including a reagent tank installed in the well below the pump unit and divided into two cavities by a separation element, a small-diameter pipeline, a loading device. The device contains three eccentric inlet couplings, the first eccentric inlet clutch is installed above the pump unit in the tubing cavity, the second eccentric inlet clutch is installed below the pump unit in the upper part of the reagent tank, and the third eccentric input clutch is installed in the lower part of the reagent tank. When dividing the container into the upper chamber for the reagent and the lower chamber for the produced fluid, the first coupling contains a check valve and a control valve, the second coupling contains a check valve and an adjustable fitting, the third coupling contains two check valves and a control valve, in the first coupling the check valve is connected to the control valve and is hydraulically connected via a small-diameter pipeline to the first non-return valve of the third coupling, in the third coupling, the second non-return valve is connected to the control valve, the control valves The first and third couplings and the check valve of the second clutch are hydraulically interconnected with the loading device by means of a small-diameter pipeline, and the first coupling also contains a filter through which the produced fluid from the tubing enters the container through a small-diameter pipeline. When dividing the tank into the upper chamber for the produced fluid and the lower chamber for the reagent, the first coupling contains check and control valves, the second coupling contains two check and control valves, the third coupling contains a check valve and an adjustable fitting, in the first coupling the check valve is connected to the control valve and hydraulically connected by means of a small-diameter pipeline to the first non-return valve of the second coupling, the non-return valve of the third coupling, the control valve of the second coupling and the control valve of the first coupling Eski connected via a conduit between a small diameter and the loading device, the first sleeve also comprises a filter through which liquid extracted from the tubing flows through small diameter conduit into a container.

Figure 1 schematically shows the inventive device for dispensing a reagent into a well when the reagent is pumped into the upper part of the tank, where

1 - tubing string,

2 - pump unit,

3 - capacity for reagent,

4 - separation element

5, 6, 7 - eccentric input coupling

8 - loading device

9, 10 - pipeline of small diameter,

11 - regulating fitting

12, 13, 14, 15 - check valve,

16, 17 - control valve,

18 - filter

Figure 2 schematically shows the inventive device for dispensing a reagent into a well when the reagent is pumped into the lower part of the tank, where

1 - tubing string,

2 - pump unit,

3 - capacity for reagent,

4 - separation element

5, 6, 7 - eccentric input coupling

8 - loading device

9, 10 - pipeline of small diameter,

11 - regulating fitting

12, 13, 14, 15 - check valve,

16, 17 - control valve.

The inventive device operates as follows. A pumping unit 2 is lowered into a well on a tubing string 1, to which a container for reagent 3 is fixed. A separation element 4 is installed in the container 3, which divides the container 3 into two parts, the separation element being made with the possibility of its axial movement in the container 3 and as The separating element may be a ball, a piston. Eccentric inlet couplings 5 and 6 are installed in the upper and lower parts of the tank 3, and an eccentric inlet clutch 7 is installed on the tubing string 1 above the pump unit 2. The hydraulic connection between the clutch 5 and 6 and the loading device 8 is carried out by means of a small diameter pipe 9, and hydraulic the connection between the couplings 6 and 7 is carried out by means of a pipeline of small diameter 10. The reagent from the loading device 8 is fed through a pipeline of small diameter 9, and bypass SK produced fluid from the tubing string 1 into the tank 3. Dosing of the reagent is carried out through an adjustable fitting 11.

Figure 1 shows a variant of the device when the reagent is pumped into the upper part of the tank. When filling the upper part (above the separating element 4) of the tank 3 with reagent in the coupling 5, the check valve 12 opens under the pressure of the reagent and the reagent enters the tank 3. In this case, the check valve 13 in the coupling 7 is closed under the action of the control valve 16, and the check valve 14 the clutch 6 is opened by the control valve 17. The control valves 16 and 17 close or open the check valves 13 and 14 under the action of the pressure of the injected reagent.

After filling the tank 3 with the reagent under the action of the pressure of the produced fluid in the sleeve 7, the check valve 13 opens and the produced fluid through the small diameter pipe 10 through the check valve 15 enters the tank 3 below the separation element 4. Under the pressure of the produced fluid, the separation element 4 moves along the axis of the container 3 up and displaces the reagent into the well through an adjustable nozzle 11. Adjustment of the nozzle 11 is made before installing the device in the well. A filter 18 is installed in the coupling 7 for cleaning the produced fluid from impurities in order to clog the small-diameter pipeline 10.

When the reagent in the tank 3 ends, it is pumped through the loading device 8. When the reagent is pumped into the tank 3, the separating element 4 moves along the axis of the tank 3 and the produced fluid filling the lower part of the tank 3 (below the separating element 4) is displaced through the check valve 14 into the well, which is controlled by the valve 17.

Figure 2 presents a variant of the device when the reagent is pumped into the lower part of the tank. When filling the upper part (above the separating element 4) of the tank 3 with reagent in the sleeve 6, the check valve 12 opens under the pressure of the reactant and the reagent enters the tank 3. In this case, the check valve 13 in the coupling 7 is closed under the action of the control valve 16, and the check valve 14 opens by the action of the control valve 77 to drain the liquid from the upper part of the tank 3.

After filling the tank 3 with the reagent under the action of the pressure of the produced fluid in the sleeve 7, the check valve 13 opens and the produced fluid through the small diameter pipe 10 enters the tank 3 above the separation element 4 through the check valve 75. Under the pressure of the produced fluid, the separation element 4 moves along the axis of the container 3 down and displaces the reagent into the well through an adjustable nozzle 11. When filling the upper part of the tank 3 with the produced fluid through the valve 15, the check valve 14 is closed under the action of a control of valve 17, opening valve 14 is carried out only under the action of the valve 17 when applying the reagent during refueling.

A filter 18 is installed in the coupling 7 for cleaning the produced fluid from impurities in order to clog the small-diameter pipeline 10.

When the reagent in the tank 3 ends, it is pumped through the loading device 8. When the reagent is pumped into the tank 3, the separating element 4 moves along the axis of the tank 3 and the produced fluid filling the upper part of the tank 3 (above the separating element 4) is displaced through the check valve 14 .

Thus, the inventive device does not require constant maintenance, but only when refueling the tank with reagent, and also provides uninterrupted supply of reagent of any density.

Information sources

1. A.S. 802526 USSR, ЕВВ 43/00, 1981.

2. Patent No. 2387808, ЕВВ 37/06, 2010

Claims (2)

1. A device for dispensing a reagent into a well, including a reagent tank installed in the well below the pump unit and divided into two cavities by a spacer element, a small diameter pipeline, characterized in that it comprises a loading device installed at the wellhead, three eccentric inlet couplings, the first eccentric inlet sleeve is installed above the pump unit in the tubing cavity, the second eccentric inlet sleeve is installed below the pump unit in the upper part of the reagent tank , the third eccentric inlet sleeve is installed in the lower part of the reagent tank, when dividing the tank into the upper chamber for the reagent and the lower chamber for the produced fluid, the first sleeve contains a check valve and a control valve, the second sleeve contains a check valve and an adjustable fitting, the third sleeve contains two check valves and a control valve, in the first sleeve the check valve is connected to the control valve and is hydraulically connected through a small diameter pipe to the first check valve of the third sleeve, in the third The second check valve is connected to the control valve, the control valves of the first and third couplings and the check valve of the second coupling are hydraulically interconnected with the loading device by means of a small diameter pipe, and the first sleeve also contains a filter through which the produced fluid from the tubing enters through a small diameter pipe into the container. 2. A device for dispensing a reagent into a well, including a reagent tank installed in the well below the pump unit and divided into two cavities by a spacer element, a small-diameter pipeline, characterized in that it contains a loading device installed at the wellhead, three eccentric inlet couplings, the first eccentric inlet sleeve is installed above the pump unit in the tubing cavity, the second eccentric inlet sleeve is installed below the pump unit in the upper part of the reagent tank , the third eccentric inlet sleeve is installed in the lower part of the reagent tank, when dividing the tank into the upper chamber for the produced fluid and the lower chamber for the reagent, the first sleeve contains check and control valves, the second sleeve contains two check and control valves, the third sleeve contains a check valve and adjustable fitting, in the first coupling the non-return valve is connected to the control valve and hydraulically connected via a small-diameter pipeline to the first non-return valve of the second coupling, the non-return valve is rd clutch control valve of the second sleeve and first clutch control valve is hydraulically connected through a small diameter conduit between itself and the loading device, the first sleeve also comprises a filter through which liquid extracted from the tubing flows through small diameter conduit into a container.

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