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oa Application of Rate-Transient Analysis for Well Performance
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Third EAGE Workshop on Iraq, Nov 2015, Volume 2015, p.1 - 4
Abstract
The most important parts of reservoir engineering in the field-development and production phases are the evaluation of the: original oil or gas in-place (OOIP or OGIP), ultimate oil or gas recoveries, reservoir characteristics and forecasting future production of well/reservoir.
Various techniques for analyzing well performance have been developed and used, including decline-curve analysis, type-curve analysis, pressure-transient analysis (PTA), rate-transient analysis (RTA) and simulation studies.
RTA uses the historical production data for the evaluation of reservoir characteristics and future well performance. It has solid theoretical basis as it uses the pressure transient theory for transient and boundary dominated flow. It overcomes: the shortcomings of the decline analysis which has no theoretical basis and the shortcomings of PTA represented by very short periods of measurement and very limited data over the well history. The long-term nature of the method makes it an important tool for determining reservoir size.
The present paper is concerned with the application of the RTA method for well performance analysis of different types of reservoirs (tight, permeable, oil and gas). The techniques can be used for analyzing Iraqi oil reservoirs, whether the more permeable ones like Rumaila or less permeable reservoirs like the Mishrif.
