Construct a Geomechanical Model to Estimate the Critical Drawdown Pressure for the Sandstone Reservoirs

Abstract

Abstract The petroleum industry is becoming more concerned about sand production because of the mounting difficulties it causes, along with the accompanying technological and operational obstacles. In this study, a field case in the south of Iraq was carried out to analyze the potential of sanding and rock collapse. This investigation has focused on the upper and lower sand layers, which are sandstone reservoirs within this field. To achieve the purpose of this study, a One-Dimensional Geomechanical Model was established along the area of interest. The critical drawdown pressure (CDDP) at which the well may be produced without experiencing shear failure or sanding was then determined at various depletion rates. The results indicated that as the rocks strength increases, so does depletion and the quantity of sand-free drawdown. Because the upper sand unit has a higher critical bottom-hole flowing pressure (Pcw), it is possible that it will begin producing sand before the lower unit. Sanding becomes more likely with each drawdown when the reservoir pressure reaches approximately 2400 psi. Finally, this research may be used as a predictor of the likelihood of sanding over the well’s productive life and as a guide for production engineers seeking to achieve optimal completion performance.