SU1474335A1 - Gaslift plant - Google Patents

Abstract

The invention makes it possible to increase the efficiency of a gas-lift unit by reducing hydraulic losses when using an air-vapor mixture as a working fluid. The mixers 2-6 of the riser pipe 1 are connected via gas pipelines 7-11 with throttles 12-16 to the working fluid supply source, made in the form of an ejector 17. The throttle section 12 is larger than the throttles 13-16, which reduces hydraulic losses. 2 Il.

Description

(21) 4152485 / 25-29

(22) 11/25/86

(46) 04.23.89. Bul fr 15

(71) Donetsk Polytechnic Institute

(72) L.L.Glukhman, V.N.Enshin, A.P. Kononenko and E.V. Uskov (53) 621.671 (088.8)

(56) USSR Copyright Certificate № 1163049, cl. F 04 F 1/18, 1983.

USSR Author's Certificate No. 325415, cl. F 04 F 5/18, 1970.

(54) GASLIFTING INSTALLATION (57) The invention improves the efficiency of the gaslift installation by reducing hydraulic losses when using an air-vapor mixture as a working fluid. The mixers 2-6 of the riser pipe 1 are connected via gas pipelines 7-11 with throttles 12-16 to the working fluid supply source, made in the form of an ejector 17. The throttle section 12 is larger than the throttles 13-16, which reduces hydraulic losses. 2 Il.

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The invention relates to pump construction, in particular, to the construction of a gas-lift unit.

The purpose of the invention is to increase efficiency by reducing hydraulic losses when using vapor-air medium as a working medium.

FIG. 1 is a diagram of a gas-lift unit; in fig. 2 - graphs of change, flow rate of the working fluid along the length of the riser when using one mixer and when using several mixers.

The gas-lift unit contains a lifting pipe 1 with mixers 2-6 connected by gas pipelines 7-11 with throttles 12-16 to the working fluid supply source, made in the form of an ejector 17, and the flow section of the lower throttle 12 is larger than the throttle 13-16. The ejector 17 is connected to gas pipelines 7-11 through pipeline 18,

Gaslift installation works as follows.

When the vapor-air ejector 17. is turned on, the mixture of air and steam under pressure is fed into pipe 18 and displaces water, reaches throttle 16. The vapor-air mixture enters mixer 2 and provides flow of working fluid with volume V, but the flow area of throttles 16 is so small that pressure in the pipeline 18 continues to rise and the water is displaced, reaching throttle 15, the flow rate of the working fluid through the mixer 3 becomes equal to Vj. This process continues until water is displaced in all throttles x 10, 9, 8, 14, 13, 12 and in all mixers 4-6, the flow rates through which will be respectively V4, Vs and Vc, and lifting will start only when the vapor-air mixture with a volume of V6 begins to flow through choke 12 into mixer 6.

Pneumatics through the lifting pipe 2 without 2 rises into the air separator

five

0

0 5 0 5

0

where the separation into liquid and gas occurs. As can be seen from the graph, after the mixer 6, the volume of the vapor-air mixture along the length of the lifting pipe 1 decreases along curve 20 due to condensation of steam and at the level of the mixer 5 reaches, remaining more than the minimum flow rate at which the lift still possible. The additional flow rate of the vapor-air mixture Vg through the mixer 5 makes it possible to maintain the volume of the working fluid in the riser pipe 1 more than the minimum necessary up to the mixer 4, the same happens in the remaining mixers.

The proposed multi-stage airlift installation will have lower hydraulic losses as compared to a single-mixer, since the aero-hydraulic mixture speed in the lower part of the riser will be lower due to (lower steam-air mixture consumption (figure 2, curve 15 and slope curve 20, 19, 18 , 17, 16).

The distance between the mixers and the ratio of the flow rates of the steam-air mixture through them is determined by the number of mixers and the need for the total volume of the steam-air mixture not to be on any of the sections of the riser pipe that is less than the required minimum volume for lifting the liquid (figure 2).

Claims (1)

Invention Formula A gas lift unit comprising a riser pipe with mixers connected by means of gas pipelines with throttles to the working fluid supply source, so as to increase efficiency by reducing hydraulic losses when using an air-vapor mixture as a working fluid made in the form of an ejector, and the flow area of the lower throttle is greater than the flow area of the upstream chokes. / s 20 Wats / wc FIG. 2