Criterion-based control method for production wells in permafrost regions

The growing number of production wells in permafrost regions calls for enhanced monitoring of thermal impacts on frozen ground. Thawing leads to loss of bearing capacity, wellbore deformation, and cavity formation, resulting in environmental risks, accidents, and economic losses. Consequently, monitoring and control of production wells in permafrost conditions have become particularly important.

Aim

This study aims to develop a criteria-based method for controlling production wells by calculating and monitoring the linear heat flow and temperature parameters of the well.

Methods

The algorithm and the decision-making protocol were developed, including a criterion for the relative deviation between actual and calculated wellbore wall temperatures, as well as a safety criterion related to the phase transition of permafrost. The applicability of the proposed method is demonstrated using a model well. Practical recommendations for data analysis and managerial decision-making are provided.

Results

The criteria-based method for production well control has been developed, based on calculating the linear heat flow of the well, monitoring temperature parameters, and analyzing deviations between actual and calculated parameters.