SU1612242A1 - Arrangement for measuring components of gas-liquid mixture - Google Patents

Abstract

The device can be used to measure components in the production flow of both oil and gas wells, in separation plants in oil fields, in oil treatment plants and in other industries. The purpose of the invention is to improve the measurement accuracy. The device contains successively installed on the pipeline a common flow jet degassers 2, 3, a flow meter 4 liquids with a secondary device 5, a pump 6, an injector 7 consisting of a nozzle 8, mixing and suction chambers 9, 10. In addition, regulators are located on the gas pipelines 13, 14 pressure, gas flow meters 15, 16 with an adder 17. Jet degassers consist of nozzles 18, 19 and expansion chamber 20 (21). The outputs of the flow meters 15, 16 gases are connected to the input of the adder 17. 1 Il.

Description

The invention relates to the field of measurement technology, in particular to the measurement of the components of a gas-liquid mixture. 5

The purpose of the invention is improving the accuracy of measurements.

The drawing shows a schematic diagram of a device.

The device consists of sequentially installed on the pipeline a common stream of jet degassers and 3, a liquid flow meter 4 with a secondary device 5, a pump 6, an injector 7, consisting of a nozzle 8, mixing 15 and a suction. 10 chamber. In addition, on the pipelines 11 and are the pressure regulators 13 and 14, respectively, the gas flow meters 15 and 16 with the adder 17. 20

Inkjet degassers 2 and 3 consist of | co.spl 18 and 19 and expansion chambers 20 and 21 ”The outputs of the gas flow meters 15 and 16 are connected to the input of the adder 17.

The device operates as follows. 25

Way.,

Moving gas-oil mixture through the pipeline 1 total flow post-. falls into the first jet degasser 2, 30 where, after narrowing in the nozzle 18, it sharply expands in the expansion chamber 20. Under conditions of sharp expansion, intense gas evolution from a moving gas-liquid mixture 35 occurs. The released gas from the expansion chamber 20 of the degasser 2 is aspirated by the injector 7 through the pipe 11 through the pressure regulator 13. The flow rate of the suction gas is measured by the flow meter 15. A stable flow rate of the released gas from the chamber 20 to the injector 7 is provided. due to the possibility of creating the required pressure drop (P (- P ₄ ) between them, the essence of which ₄₅ is as follows.

Gas evolution in jet degassers is caused by a pressure gradient P _k = P _s · - P _l . According to experimental data, it is known that the pressure Рd in the sections A of the expansion chamber 20 is significantly lower than the pressure Р _с at the outlet of the nozzle 18. When the gas-oil mixture flows from the nozzle 18 into the expansion chamber 20 due to a sharp pressure drop, the qualitative composition of the flow changes due to the phase inversion effect . In the nozzle 18, the gas-oil mixture enters in the form of a dispersed system in which the continuous phase is oil and the dispersed phase is gas. Behind the nozzle 18, phase reversal occurs in the expansion chamber 20 (phase inversion), the gas becomes a continuous phase, and the oil becomes a dispersed phase. Under conditions of phase inversion, the gas-oil mixture is degassed. The rate of gas evolution depends on the intensity of gas desorption from droplets.

The fragmentation of a continuous stream of liquid occurs under the action of aerodynamic forces due to the relative motion of the phases. When this occurs, the first decay of the jet into droplets behind the nozzle 18, which are crushed into smaller particles at the entrance to the expansion chamber 20 (secondary crushing). In the zone of the primary fragmentation of the jet, free gas is separated, and germinal bubbles of dissolved gas begin to form in the droplets. Subsequently, gas evolution is determined by the ascent rate i of the germinal bubbles in the droplets. Necessary: the required degree of phase separation is achieved by a constructive selection of the dimensions of the expansion chamber 20 and the nozzle 18 depending on the particle size of the dispersed phase, its speed, duration of desorption, liquid stay in the degassing zone and the scale of the diffusion flow. Owing to these phenomena, a two-phase system is continuously separated, and gas £ aza is directed to the area A of the lowest pressure of the expansion chamber 20 of the jet degasser-torus 2. For a more complete separation of the gas phase from the liquid, the main stream enters the second jet degasser 3, in which the same physical processes as in the degasser 2. The released gas is sucked out by the injector 7 through a pipe 12 through a pressure regulator 14. The flow rate of the exhaust gas is measured by the flow meter 16.

In the line of the liquid phase after the degasser 3, a liquid flow meter 4 and a pump 6 are installed in front of the injector 7. The pump 6 provides the necessary pressure, therefore, speed, in the nozzle 8.

The injector operates as follows. The working fluid enters the nozzle through a pipeline from the pump 6, and from there it enters the mixing chamber 9 at a high speed. Due to a significant increase in speed, a suction chamber appears in the suction chamber 10 of the injector 7. Under vacuum, the gases released from the expansion chambers of the first 2 and second 3 degassers enter through the suction pipes 11 and 12 into the suction chamber 10 of the injector 7 and then into the mixing chamber 9.

In order to select the required operating mode, pressure regulators 13 and 14 are installed in the suction lines. These regulators also prevent the liquid phase from entering the gas lines.

To measure the total amount of gas contained in the gas-liquid mixture, the outputs of the flow meters 15 and 16 in the gas lines are connected to the inputs of the adder 17. According to the output signals of the flow meter 4, the amount of liquid phase. in time it is measured by the device 15. I ¹ In the proposed device, in comparison with the known flow rate of a moving gas-liquid system is not measured. Each component is measured by separate flow meters.

161.2242 6

Claims (1)

Claim A device for measuring the components of a gas-liquid mixture containing an injector, a sequentially placed jet degasser and a liquid flow meter installed on the pipeline, characterized in that, jq, in order to increase the accuracy of measurements, a second jet degasser, a first and second gas flow meter, an adder are additionally introduced into it , the first and second pressure regulators 15 and a pump, the first and second degassers, the pump and the injector installed in series on the pipeline, and the expansion chamber of the first jet degassing ra 20 through the first pressure regulator and gas flow meter is connected to the injector mixing chamber, the opposite side of which is connected with the second expansion chamber through the jet degasser vto25 swarm pressure regulator and flow meter. gas, the outputs of the first and second gas flow meters are connected to the first and second input of the adder.