Applied Well Testing Analysis Considerations in Channel Reservoir Coupled with Dynamic Simulation Model

Abstract

AbstractIn this paper will describe the integrated workflow between two well-known reservoir engineering approaches PTA and 3D dynamic simulation. This workflow provides significant help to understanding the channel sand reservoir properties, predict possible well interference and provide consistent well's production prediction forecast. The available geological background, seismic data to map the combined channels, and even well by well Petrophysical correlation showed limited capabilities to characterize the channel heterogeneity due to the reservoir continuity change consistently, and for most of the cases the channels features are unpredicted. Giving these limitations, it is necessary to consider using other engineering approach; e.g. Pressure Transient Analysis (PTA), Rate Transient Analysis (RTA), Dynamic Simulation models to narrow down the uncertainties for better understanding of the reservoir quality.This customized workflow was completed and used in this study to cover all uncertainty parameters during the calibration and prediction of the wells’ performance. It consists to calibrate the geological model using Pressure transient Analysis (PTA) and dynamic simulation model output to enhance the geological model calibration assessment under uncertainty. As results; multiple geological realizations were obtained to cover the possible uncertainty ranges for each parameter. Furthermore, the Well prediction scenarios were performed to evaluate the range of wells’ production prediction forecast under multiple geological realization uncertainty to be more confident in predicting the wells performance under different well constrains and come up with minimum and maximum values. The main challenge associated with the development of channel tight gas sand reservoirs is how to predict the channel attributes and location; e.g. channel width, height, and how to quantify their effect on the well's long-term performance. This workflow will help to quantify the channel properties, interference between wells, and it will guide you on how to select the new well locations for better business planning.