WELL TESTING DESIGN DEVELOPMENT IN CARBONATE RESERVOIR

Abstract

The relevance of the research is caused by the need to improve the methods of well testing due to the ambiguous interpretation of the results in a carbonate reservoir. Priorities in well testing are the maximum quality of the information obtained on the reservoir filtration and reservoir properties and the minimum loss of oil production during the shutdown of wells for research. In order to perform these tasks, it is important to develop the design of the well testing proposed in the article. The design will provide an integrated approach to modeling the process of conducting research and forecasting the data received. The main aim of the research is to develop the design of well testing in order to optimize the time of the research and reduce the period of shutdown of wells at the stage of pilot operation, as well as to confirm the economic effectiveness of the presented methodology. Objects: wells T-23, T-361, T-388 of oilfield A, the productive deposits of which are mainly represented by strong cavernous-fissured carbonate rocks of Riphean age. Methods. The set research tasks were solved theoretically and experimentally under field conditions. At the same time, the analysis of publications on this issue was carried out; field hydrodynamic studies of wells that open a low permeable carbonate reservoir were conducted; simulation of hydrodynamic studies was carried out, comparative calculations were carried out for processing the results using the Saphir software package of KAPPA Engineering. Results. This article presents the results of developing the design of hydrodynamic studies in a carbonate reservoir. The data of hydrodynamic studies for 12 wells operating Riphean carbonate sediments were analyzed for 2005–2008, the results for three wells: T-23, T-361, T-388, are presented. The technique of simulation of hydrodynamic researches in the software complex Saphir of the company «KAPPA Engineering» is presented. The paper introduces the example of calculation of the stabilization time in the study of the well by the method of steady-state sampling, as well as estimation of the optimum time for recording the pressure recovery curve. Also, the article compares the standard methodology used for testing a well – RD (ruling document) 153-39.0-109-01 «Methodological guidelines for the integration and phasing of geophysical, hydrodynamic and geochemical studies of oil and oil and gas fields» with that presented in the article . Based on this comparison, the economic efficiency was established.

Keywords

• well testing
• build-up test
• design
• duration of well investigation
• carbonate reservoir
• oil and gas field