Device for determining the concentration of gas in liquid

 

(57) Abstract:

The device is applicable to determine the concentration dissolved in the liquid gas by the method of degassing a liquid and measuring the selected gas chemical indicator. It contains a chamber with a piston, measuring pipette with a check valve, and a discharge gas tube, hermetically embedded in the piston and provided with a locking device, the indicator and the aspirator to create a vacuum. When closed, the shut-off device, the camera works as a sampler and, in the open position as the crystallizer liquid samples. Ensured the integrity of the process of sampling and further analysis by the supply device non-return valve, shut-off device and combining in one camera three elements: pump, metering capacity and degasser. Achieved by increasing the accuracy of determining the concentration of gas in liquid, simplifying the design of the device and facilitate its operation. 1 Il.

The present invention relates to devices for measuring the concentration of gas in oil field fluids and can be used in finding, mining and processing of oil and water.

A device for measuring the gas content of the drilling fluid, sadista is stationary and overall product with the help of which it is impossible to determine the concentration of gases in the fluid sample at a distance from each other.

A device for selection of gas-liquid sample in the well and determining the content of dissolved gases containing a vacuum chamber with a scale and a system of valves (and.with. The USSR 1608456, CL G O1 N 7/10, 1990). The device is intended for use in wells and wells to determine the gas content in the fluid sample from the process vessels and piping.

A device for measuring components of the gas-liquid mixture containing the injector, degassers and flow meters.with. The USSR 1612242, CL G O1 N 7/14, 1990). The device is installed on the pipeline stationary, is not portable and is not possible to determine the gas content in the fluid sample other oil production facilities and training.

Closest to the proposed technical solution (prototype) is the analyzer of hydrogen sulfide in the liquid ALJ-1 (Technical description and operating instructions, Bashneft, 1995), containing a chamber for liquid and gas (desorber) with the piston, a measuring head with a pipette, bubbler head with a draining pipe, indicatorsa is Alenia and set it to zero on the measuring pipette, then the camera is placed 0,2-2,0 cm3the analyzed fluid and the measuring head is replaced by a bubble. Degassing of the liquid samples is provided by the vacuum in the chamber by operating the suction pump and the inflow of clean air. Selected gases with air to pass through the indicator tube which responds to the desired gas, in particular hydrogen sulfide. After complete degassing at the camera again wrapped the head with a pipette and measured the volume of the initial sample fluid. The gas concentration is determined by dividing the mass of trapped gas volume of the sample fluid.

The gap in time between the location of the sample liquid into the camera and attach bubbler head leads to some loss of the desired gas and distortion of the end result, and the double change from one head to another increases the time of analysis. A third disadvantage of the prototype is the need to ensure and verify integrity camera connection with measuring and bubbler heads.

To improve the accuracy of determining the gas content in the liquid while simplifying the structure of the device and facilitate its operation known device for determining the concentration of asuu gas tube, the indicator and the aspirator made so that the camera is calibrated by volume, measuring pipette equipped with check valve and simultaneously serves as the inlet gas tube, and a discharge gas tube is hermetically embedded in the piston and provided with a locking device.

The proposed device is shown in the drawing, 1 is a camera for the content, measuring the volume, dilution and degassing liquids with gas, 2 - piston 3 - measuring pipette, 4 - valve, 5 - discharge gas tube, tightly integrated in the piston, 6 shut - off device 7 to display, 8 - aspirator.

The device operates as follows.

The piston 2 is directed to a camera in an extreme position by pipette, and the locking device 6 is closed. With a large estimated gas concentration in the liquid tested in the pipette 3 through the check valve 4 by the upward movement of the piston 2 enter the desired volume of liquid, fix it, and further movement of the piston dilute a sample of the inert gas to the solvent so that the total volume of liquid did not exceed half of the volume of the chamber. The piston 2 is taken off to the extreme position opposite to the pipette, and begin the process of degassing. To do this, to discharge gas tube 5 is attached indranie, admission to the chamber of clean air or inert gas, the selection of the desired gas from the liquid and the recording indicator 7.

When small, the estimated gas concentration in the liquid in the chamber 2 through the pipette 3 type necessary for degassing process, the volume of the liquid under study, record this amount on the scale of the camera and make the degassing according to the described scheme.

Due to the first significant difference is the placement beginning of the discharge gas tube in the piston and the supply shutoff device, the degassing chamber 2 has an additional function - when closed, the shut-off device, the camera plays the role of the sampler.

The second significant difference is the combination in one product measuring pipette, and the inlet gas tube allows to exclude from the process of sampling and further analysis period of the depressurization chamber. The test of the claimed device for hydrogen sulfide-containing samples of oil and water from wells, tanks and pipelines NGDU "Chickmagnet" ANK Bashneft has shown that the implementation of this important differences increases the accuracy of determining the concentration of hydrogen sulfide by 5-10% in samples with a high content of this gas (200 mg/l and more).

The third Cresnet determine the content of gas (hydrogen sulfide) in samples with little content, what is the possibility of selecting for analysis a small amount of fluid (in the prototype of 0.2-2.0 cm3- volume pipettes), and much more, as the volume of chamber 1 exceeds the volume of the pipette 3 dozens of times.

Technical and economic efficiency of the proposed device is formed by the following points:

1) increases the accuracy of determining the concentration of solute in the liquid gas, which leads to an objective assessment of the situation and make the necessary decisions;

2) simplified design reduces the cost of manufacture and facilitates its operation.

Device for determining the concentration of gas in a liquid, comprising a chamber for liquid and gas with the piston and measuring pipette, inlet and outlet gas tube, the indicator and the suction device, characterized in that the camera is calibrated by volume, measuring pipette equipped with check valve and simultaneously serves as the inlet gas tube, and a discharge gas tube is hermetically embedded in the piston and provided with a locking device.

 

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