RE-PERFORATING TO ENHANCE THE OIL AND GAS PRODUCTION IN A MATURE FIELD BY COMBINING GEOMECHANICAL CALCULATION WITH LITHOLOGY AND FLUID BEARING ANALYSIS BASED ON WELL DATA

摘要

One of the problems that is faced by the oil and gas industry is the decline of production in mature fields. To increase it, one of the ways that can be done is performing re perforation in another reservoir zone below or above the main reservoir zone. Perforation itself is an activity that is used to connect the well and formation, so that the fluid can flow to the wellbore. Perforations also have an important role for the successful production phase in a new wellbore. One factor that needs to be considered when we are performing perforation is the fracture width that is created as the result of perforation. The fracture width itself is a function of height of the fracture, Young's modulus, Poisson's ratio and the net pressure. Recently, the fracture width has also becomes a key factor in developing unconventional hydrocarbon geomechanical calculation that related to brittleness calculation in 1D data at well location. Moreover, our research found that the brittleness has a high correlation with fracture width about 0.96 in linier regression. In addition, to know the best zones to perform perforation, other data is needed such as lithology and fluid bearing formation based on well data and not just based on the brittleness value. The effect of lithology and fluid with brittleness calculation in the well data were also compared. The results show that: the brittleness value can indicate the fracture width that is applied in the formation, the lithology affects the brittleness value, e.g. sand more brittle than shale, and the last is that fluid bearing formation also affects the brittleness.