Optimization of carbonate reservoir well testing

Abstract

The purpose of the paper is to design a workflow for well testing to optimize the time of study and reduce the switch-off period of wells in a pilot test. Another puprose is to confirm the economic efficiency of the presented workflow. Wells T-23, T-361, T-388 of the A-field were used as objects of study. Deposits of A-field are predominantly represented by cavernous-fractured carbonate rocks of the Riphean age. During the study an analysis of publications on the problem was performed. Field tests of wells located in low permeability carbonate reservoir were carried out. Modeling of well tests was carried out. Comparative calculations on the processing of results with help of Saphir software of KAPPA Engineering were made. Results on development of the well test workflow are given. The data of hydrodynamic investigations for 12 wells operating Riphean carbonate deposits for the period 2005–2008 are analyzed and results for wells T-23, T-361, T-388 are presented. An example of calculation of stabilization time for wells by the method of steady-state sampling as well as estimation of the optimal time of recording the pressure recovery curve are given. In addition, a comparison of the standard workflow) used in the well test (RD 153-39.0-109-01) is performed. Methodical instructions on complexing and stage of implementation of geophysical, hydrodynamic and geochemical studies of oil and oil and gas deposits (with the method) are presented in the paper. Based on the comparison economic efficiency was established.

Keywords

• well test
• pressure recovery curve
• workflow
• well test time
• well operation mode
• carbonate reservoir
• oil and gas field