The purpose of this work is to create a model to ensure hydrate-free operation of gas lift wells based on data on pressure and temperature at well sites most prone to hydrate formation, inhibitor concentration, as well as historical information about previous hydrate formation at the site.

To achieve the objectives, first of all, statistical methods of high-frequency data analysis were used in order to automatically identify hydrate formation intervals at an early stage. Information about temperature and pressure at the time of the intervals identified algorithmically and confirmed in the field, was used as points of adaptation of the hydrate formation curve. Information on inhibitor concentration was also taken into account when constructing the curve. The resulting curve allows calculating the risk of hydrate formation at a particular node and recommending the optimal inhibitor concentration to ensure a hydrate-free regime. All results of the algorithm are displayed in the user interface in tabular and graphical form and are supplemented with information about the well and relevant nodes of the inhibitor pipeline system.

The result of this work is an implemented system for determining the risk of hydrate formation and making recommendations for the concentration of injected hydrate inhibitor. The methodology based on the use of historical data on hydrate formation in the node as points of curve adaptation allows to take into account the inaccuracy of empirical correlations in view of the possible irrelevance of information about the component composition of the fluid or the presence of components, which are not a parameter of the correlation relationship. The model can be used as a tool for online monitoring of hydrate formation risk in the node, depending on the current values of telemetry, and as a recommendation tool for drawing up the technological mode of the well and the selection of optimal planned concentration of inhibitor, which provides hydrate-free mode for all the nodes of the well. Using this system simplifies technologists work and allows them to focus their attention only on wells that require recommendations to adjust inhibitor concentration or are at risk of hydrate formation.

The novelty of this work is to build a system for planning or ensuring hydrate-free operation using the methodology based on the method of adapting the hydrate formation curve on the historical data.

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