Abstract

Daman formation of late Oligocene age in B-12 fields of Tapti-Daman field is major Gas producing zone. However, the major issue encountered in these gas bearing clastics reservoirs is sand incursion as has been reported during initial testing as well as during production. This impact production rates, increase in maintenance costs as well as equipment erosion due to sanding. Sanding has Geomechanical root and finding and addressing the cause of sanding will enrich increase in production. This study aimed to understand the causes of sanding in Daman formation, reservoir characterization of Daman pays, mechanical properties from core data and critical drawdown pressure to maximize safe production and preserve the longevity of the reservoir. Daman sands were clastic reservoir with very good reservoir facies having porosity in the ranges of 25-35% and permeability in the range mD and prone to sanding incursion. 1D Mechanical earth model is one dimensional presentation of elastic and rock strength parameters of rock, stress regime and safe mud window or well bore stability and these elastic properties govern its deformation and failure. Principally Young Modulus, Poisson’s Ratio, unconfined compressive strength, internal friction angle, and tensile strength. The rock is constrained by 3 principal stresses, which in a 1D approach are the Overburden/Vertical Stress (Sv), Minimum Horizontal Stress (Shmin), Maximum Horizontal Stress (SHmax) and the direction of SHmax.