RU65117U1 - DEVICE FOR DOSED FEEDING OF CHEMICAL REAGENTS IN A WELL - Google Patents

Abstract

The utility model relates to the oil industry, in particular, to protection against corrosion damage, asphalt-resin-paraffin deposits, scaling of deep pumping equipment of wells by unhindered dosing of chemicals.

There is a method consisting in dosing chemical reagents to the required depth, including the bottom hole zone, through a capillary pipeline through the wellbore, where the flow rate of the reagents is adjusted at the wellhead by installing a metering pump.

The objective of the utility model is the guaranteed supply of a chemical reagent to any depth below the pumping equipment.

The problem is solved in that the device for the dosed supply of chemical reagents into the well includes an electric dosing pump installation; discharge line; a suspension device at the lower end of the pump unit with a cable suspended to it, at the other end of which a load with centering ribs is placed; a capillary pipeline equipped with an exhaust valve-spray, passing along the outer surface of the tubing, pump unit and along the cable and rigidly attached to them.

Description

The utility model relates to the oil industry, in particular, to protection against corrosion damage, asphalt-resin-paraffin deposits, scaling of deep pumping equipment of wells by unhindered dosing of chemicals.

A device (analogue) is known for dosed supply of a chemical reagent into a well, where a capillary pipe for supplying a reagent is fixed on the outer surface of the tubing, and the outlet valve of the capillary pipeline is located in the receiving zone of the pump [1].

The disadvantage of this device is the inability to supply a chemical reagent to great depths, for example, in the perforation zone or the bottomhole zone.

Closest to the claimed (prototype) is the method [2], which consists in dosing chemical reagents to the required depth, including the bottomhole zone, through a capillary pipeline along the wellbore, where the flow rate of the reagents is adjusted at the wellhead by installing a metering pump.

The disadvantage of this method is the inability to supply a chemical reagent to any depth below the pump unit due to the limitation of the carrying capacity of the capillary pipeline.

The objective of the utility model is the guaranteed supply of a chemical reagent to any depth below the pump unit.

The problem is solved in that the device for the dosed supply of chemical reagents into the well includes installation

dosing pump; discharge line; a suspension device at the lower end of the pump unit with a cable suspended to it, at the other end of which a load with centering ribs is placed; a capillary pipeline equipped with an exhaust valve-spray, passing along the outer surface of the tubing, pump unit and along the cable and rigidly attached to them.

In FIG. schematically depicts the inventive device for the dosed supply of chemical reagents into the well, where

1 - capillary pipeline;

2 - tubing;

3 - pump unit;

4 - suspension device;

5 - cable;

6 - electric dosing pump installation;

7 - discharge line;

8 - spray valve;

9 - load with centering ribs.

The inventive device operates as follows. A capillary conduit 7, rigidly attached to the tubing 2, a pumping unit 3, a suspension device 4, a cable 5, is lowered into the well. The capillary conduit 7 is connected at one end to the metering pump 6 via a discharge line 7, and a spray valve 8 is placed at its other end. The cable 5, to ensure the passage of the capillary pipeline to any depth below the pump unit, is attached to the pump unit by means of a suspension device 4, and a load with centering ribs 9 is attached to the lower end of the cable 5. Centering ribs and provide centration of cargo in the well and prevent it crash.

Thus, the capillary pipeline, rigidly fixed to the tensioned cable, passes through the wellbore, the end of the pipeline with the spray valve does not hook on the walls of the column and this ensures the supply of reagent to any depth of the well below the pump unit.

Information sources:

1. Patent 2231628 of the Russian Federation, 7 ЕВВ 37 / 06,2004.

2. Patent 2260677 of the Russian Federation, 7 ЕВВ 41/02, ЕВВ 37/06, 2005.

Claims (1)

A device for the dosed supply of chemical reagents into the well, including the installation of a metering pump, an injection line, a capillary pipe passing along the outer surface of the tubing and pump unit, the capillary pipe is equipped with an outlet valve in the lower part, characterized in that at the lower end the pumping unit is equipped with a suspension device to which the cable is suspended, and a capillary pipeline is rigidly attached to the cable, and a load with entriruyuschimi ribs.