«Automation and Informatization of the fuel and energy complex»

Automatic control of methanol supply at the wellhead complicated by gas hydrate deposits

UDC: 681.5
DOI: -

Authors:

¹ Tyumen Industrial University, Tyumen, Russia
² Gazprom Neft, St. Petersburg, Russia

Keywords: gas hydrates, temperature and pressure conditions, gas wells, water factor, wellhead, loop, model, crystallization and thawing dynamis, automatic feeding control, methanol, control of the proportion of the flow section narrowing

Annotation:

One of the key problems of stable operation of gas and gas condensate fields in the north of Russia, characterized by an increased moisture factor, is associated with the gas hydrates crystallization and sorption in the segments of the lifting device and wellhead loops of the gas gathering network. The problem is aggravated by the variability of low outside air temperatures in case of high reservoir pressures. One of the widely used technologies of flow lines anti-hydrate exploitation is the application of wellhead methanol feeders (hydrate formation inhibitor), the injection point of which is located before the possible hydrate precipitation. With account for the scale of production volumes, the key problem of efficient well operation is the task of regulating the minimum level of methanol supply, sufficient to prevent and eliminate possible deposits. The model of the gas-dynamic system from the reservoir pressure to the gas collection network and the results of the computational analysis of the regime dynamics in two cases – without methanol feeding and under conditions of automatic feeding, presented by the authors of the article, can serve as a constructive basis for building a closed-loop control system for monitoring the thermo-baric states of the wellhead with an assessment of the proportion of hydrate overlap of the flow section of the flow line.

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