SU857441A1 - Deep-well reagent batchmeter - Google Patents

Description

(54) DEEP REAGENT DISPENSER

I

The invention relates to the oil industry and serves to dose reagents into the well stream of a pumped out working medium, for example, to combat the paraffinization of underground equipment during oil pumping, downhole demulsification, and increase the efficiency of fluid lifting through tubing pipes.

The invention can also be used in the gas, mining and other sectors of the industry for the dosed supply of reagents to the flow of the working medium.

A deep reagent dispenser is known, including a housing filled with a reagent, with openings for the outlet of the latter, a piston with weights 1.

The disadvantages of this device are that with a small difference in the specific gravities of the reagent and the evacuated medium, there is an uneven supply of the reagent over time, since with an increase in the total weight of balls (weights) dropped on the piston, the force of the piston increases, which leads to reduces the effectiveness of the use of the reagent, as well as the fact that the presence of a large number of balls measuring thousands of pieces, which complicates the design of the dispenser, the technology of its installation; In addition, the location of the capillary metering orifice at the bottom of the dispenser increases the possibility of its clogging and stopping the supply of the reagent, which reduces the reliability of its operation, and the need to slide along the inner surface of the piston body

10 requires the manufacture of an inner surface with a high class of fit to the piston, which is technologically difficult, increases the cost of its manufacture.

The closest technical solution to what is known is a deep dose of a reagent, including a housing filled with a reagent with openings for the latter, a hollow piston, a rubber cuff, a covering piston, a dosing unit, a filter, and capillary dosing openings 2.

20

The drawbacks of the device are that with a small difference in the specific weights of the reagent and the evacuated medium, there is an uneven supply of reagent over time, which reduces its efficiency, as well as the fact that the location of the capillary metering orifice in proportion to the metering unit increases the possibility of its clogging and stopping the supply of the reagent, which reduces the reliability of its operation; in addition, the use of a piston sliding along the inner surface of the housing requires the manufacture of an inner surface with high The piston fit class, which is economically difficult and increases the cost of its manufacture.

The purpose of the invention is to improve the reliability and efficiency of the device when working with a reagent, the specific weight of which is close to the specific weight of the pumped medium.

This goal is achieved by the fact that the dosing unit is located in the upper part of the piston and is hydraulically connected to the housing cavity through the piston cavity, and the reagent outlet openings are placed above the rubber cuff, the latter being rigidly connected to the housing.

The drawing shows the proposed dispenser, a longitudinal section.

The dispenser consists of a housing 1, having a cylindrical shape and filled with reagent 2 in its lower part. In the housing cavity, concentric to it, there is a hollow piston 3 with a rubber cuff 4, which surrounds the piston and is rigidly fixed in the housing 1, in which holes 5 are made above the rubber cuff. In the upper part of the hollow piston 3, the dosing unit is fixed, including the adjusting metering needle valve 6 blocking the channel 7, and in the walls of the hollow wall 3 above the valve 6 are made holes 8.

The dispenser works as follows.

Under the influence of the weight of the piston 3 in the volume of the reagent in the lower part of the housing 1, an overpressure is created, as a result of which the reagent flows out through the cavity of the piston 3 and the holes 8 as in the area of the housing

above the rubber cuff and into the annulus through the holes in the housing 1. The reagent is metered in through an adjustable needle valve 6, which, when axially moving

can cover or open the channel 7, thereby regulating the consumption of the reagent. This operation is performed on the surface during installation of the dispenser. As the reagent is consumed, the piston 3 moves down.

in the cuff 4, which provides reliable sealing of the volume of the reagent placed in the lower part of the body from the cavity of the working medium. The volume of the dispenser is selected depending on the required reagent consumption and the required duration.

its feed into the well.

The use of the device according to the invention makes it possible to increase its service life by eliminating capillary dosing ports in it, which are easily clogged, which makes the device inoperable.

Claims (2)

1. USSR author's certificate in application number 2686032, cl. G 01 F 11/00, 1978. 2. Shnerh S. et al. Downhole reagent dispenser. M., 1977, No. 2, p. 9, 10 (prototype).