RU62973U1 - DEVICE FOR DOSING CHEMICAL REAGENTS TO A WELL - Google Patents

Abstract

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

A device is known, including: an installation at the wellhead, consisting of metering pumps with tanks for chemical reagents, equipped with check valves; capillary pipelines for supplying various chemicals to specified depths.

The objective of the utility model is the elimination of reagent losses during the descent of capillary pipelines into the well, the accuracy of dosing during the operation of pumping equipment.

The problem is solved in that the device for dispensing chemical reagents into the well includes a container for chemical reagents and a metering pump installed at the wellhead; capillary pipe passing on the outer surface of the tubing; check valve installed in the lower position of the capillary pipeline and configured for the opening pressure p _to > ρgh ₁ · F _cl , where ρ is the density of the supplied reagent, g = 9.81 m / s ² , h ₁ is the height of the column of chemical reagent above the check valve , F _KL - the area of the passage section of the seat of the check valve; a tank with a bypass valve installed in the extreme upper position of the capillary pipeline.

Description

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

A device (analogue) for supplying reagent and water to the bottom of the well, including a tank for the reagent, a dispenser, lowered on the pump and tubing to the well, an armored hose for periodic injection of the reagent into the tank, equipped with a check valve [1].

The disadvantages of this method, due to the placement of the tank for the reagent and dispenser in the well, are the inability to control the flow of the reagent during the pumping of the reservoir fluid and the risk of an accident.

Closest to the claimed (prototype) is a device [2], including: installation at the wellhead, consisting of metering pumps with tanks for chemical reagents, equipped with check valves; capillary pipelines for supplying various chemicals to specified depths.

The disadvantages of this device are the possible loss of reagent when it is pumped into capillary pipelines and an unstable supply of reagent due to mixing of the reagent with air.

The objective of the utility model is the elimination of reagent losses during the descent of the capillary pipeline into the well, the accuracy of dosing during the operation of pumping equipment.

The problem is solved in that the device for dispensing chemicals into the well includes a tank for chemical

reagents and a metering pump installed at the wellhead; capillary pipe passing on the outer surface of the tubing; check valve installed in the lower position of the capillary pipeline and configured for the opening pressure p _to > ρgh ₁ · F _cl , where ρ is the density of the supplied reagent, g = 9.81 m / s ² , h ₁ is the height of the column of chemical reagent above the check valve , F _CL - the area of the bore of the non-return valve seat; a tank with a bypass valve installed in the extreme upper position of the capillary pipeline.

In FIG. schematically shows the inventive device for dispensing chemical reagents into the well, which consists of a tank for chemical reagents 1, a metering pump 2, a pressure gauge 3, a buffer tank 4 with a bypass valve 5 installed on the wellhead. A capillary pipe 6, at one end of which a check valve 7 is installed, at the other end - at the entrance to the tubing - a check valve 8, passes along the outer surface of the tubing 10.

The device operates as follows. Before the descent, the capillary pipe 6, wound on a drum, is filled with a chemical reagent. During the descent the chemical reagent does not leak from the pipeline, since the check valve 8 is lowered to zakryt.Pri metering pump required depth h ₁ 2 delivers the chemical reagent under a pressure p _q> p in _a capillary tube - a check valve 8 opens and begins to enter the reagent well. The metering pump 2 controls the flow of the reagent. Since in the container 1 the reagent is in contact with air, it is possible to saturate the reagent with air, which then enters the capillary conduit 6. The release of air from the reagent in the capillary conduit creates air plugs, which reduces the necessary dosage of the reagent. In this case, the unstable operation of the dosing system is characterized by an increase in the pressure fluctuation recorded by the manometer 3. Air and gas plugs accumulate in the buffer tank 4 and are vented by opening the bypass valve 5.

This ensures the accuracy of the dosage of the reagent and prevents leakage of the reagent during tripping.

Information sources:

1. A.S. 883343 USSR, E 21 B 43/00, 1981.

2. Patent 2260677 of the Russian Federation, 7 Е 21 В 41/02, Е 21 В 37/06, 2005.

Claims (1)

A device for dispensing chemical reagents into a well, including a container for chemical reagents, a metering pump, a capillary pipe passing on the outer surface of the tubing, a check valve, characterized in that the check valve installed at the inlet to the tubing is set to pressure opening p _to ≥ρgh ₁ · F _cl , where ρ is the density of the supplied reagent, g = 9.81 m / s ² , h ₁ is the height of the column of chemical reagent above the check valve, F _cl is the passage area of the seat of the check valve, and in topmost position towards a capillary pipe is connected to a tank with a bypass valve.