The Effect of Poisson’s Ratio and Young’s Modulus on Fracture Geometry of 2D Model PKN: Case Study of Unconventional Reservoir

Abstract

Unconventional reservoirs usually have thick reservoir and contain a lot of hydrocarbon. But there is a challenge that must be faced, very tight permeability (<0.001 mD). For this reason, hydraulic fracturing must be applied to create ways. There is no standard equation applied in Indonesia to design the fracture geometry on unconventional reservoir. This paper will discuss about fracture geometry design on unconventional reservoir of Brown Shale, Central Sumatra Basin using the 2D PKN (Perkins-KernNordgren) model. In order to design the fracture geometry, it is necessary to know some geomechanic parameters, such as Poisson’s ratio and Young’s modulus. Fracture geometry are designed using the 2D PKN (Perkins-Kern-Nordgren) model, the results are fracture length and width. As the results obtained, the sensitivity analysis of Poisson’s ratio and Young’s modulus are performed to understand the effect of geomechanics on fracture geometry designed. With reservoir height of 153 ft, the fracture length generated is 300.97 ft and average fracture width generated is 0.29 inch. The results of geomechanical sensitivity analysis present the same effect between Poisson's ratio and Young's modulus on the fracture length and fracture width. The lower Poisson's ratio and Young's modulus we get, the fracture length goes shorter, while the fracture width goes wider. The results of the analysis will then generate integrated approaches to estimate the fracture length and fracture width with a certain value of Poisson's ratio and Young's modulus.