Study of capacitive sensor errors of moisture content of gas well products
UDC: 621.3.082.722.5
DOI: -
Authors:
KASYANENKO ANDREY A.
1,
FATEEV VALERY YA.2
1 Severnefnegazprom, Novy Urengoy, Russia
2 V.A. Trapeznikov Institute of Control Sciences of RAS, Moscow, Russia
Keywords: gas flow, sensitive element, semi-cylindrical plates, Clausius – Mossotti formula, permittivity, working capacitance, parasitic capacitance, concentration, water droplets, error
Annotation:
The design of the capacitive sensor sensitive element (SE), made in the form of two semi-cylindrical plates is proposed. The main factors affecting the error of monitoring the concentration of droplet moisture in a gas flow by such a sensor are considered. These factors include: the accuracy of the impedance meter measuring the SE capacitance, consisting of working and parasitic capacitances, temperature variations of these capacitances and the influence of the gas flow non-aqueous fractions (sand, gas condensate, etc.). Using the Clausius – Mossotti mathematical model, a quantitative assessment of the errors caused by the above-mentioned factors was carried out for the SE with the specified design parameters. For these parameters, with an impedance meter error of 0,01 pF, it was shown that the capacitive sensor absolute error in the concentration range of 0...10 % does not exceed 0,32 %. Such accuracy, combined with high reliability and low cost of capacitive sensors, allows recommending their implementation at gas production enterprises to control the amount of droplet moisture in the gas flow.
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