Salt Precipitation in the Near Well Bore Region of Gas Wells

Abstract

Abstract A numerical model was created to predict timing and location of salt precipitation near the well bore region of mature gas wells. The model provides quantitative insight into the relevant reservoir and well properties that govern salt precipitation and its remediation. The model is used to predict the well's gas production and improve mitigation strategies. The numerical model has been developed using DumuX, a simulator developed by the University of Stuttgart. The model has been extended to incorporate several additional features essential to model salt precipitation and dissolution. A sensitivity study has been conducted to evaluate the impact of varying parameters such as initial liquid saturation, permeability, salinity, well pressure and drawdown on the model. Production loss mitigation strategies used can differ depending on the location and timescales of precipitation. A study of the parameters controlling the productivity of wells plagued by salt precipitation shows scope for improving reservoir management strategies which can delay the onset of salt clogging thereby improving gas production.