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Estimating the Properties of Naturally Fractured Reservoirs Using Rate Transient Decline Curve Analysis

Journal of Earth Science 2017年第5期28卷 848-856页

作者： Amin Daryasafar Mohammad Joukar Mohammad Fathinasab Giovanni Da Prat Riyaz Kharrat Petroleum Department Petroleum University of Technology Department of Petroleum Engineering National Iranian South Oilfields Company (NISOC) Department of Chemical and Petroleum Engineering Sharif University of Technology Da Prat & Associates (Consulting Company)

Transient rate decline curve analysis for constant pressure production is presented in this pa- per for a naturally fractured reservoir. This approach is based on exponential and constant bottom-hole pressure solution. Based on this method, when In （flow rate） is plotted versus time, two straight lines are ob- tained which can be used for estimating different parameters of a naturally fractured reservoir. Parameters such as storage capacity ratio （co）, reservoir drainage area （A）, reservoir shape factor （CA）, fracture per- meability （ky）, interporosity flow parameter （,~） and the other parameters can be determined by this ap- proach. The equations are based on a model originally presented by Warren and Root and extended by Da Prat et al. and Mavor and Cinco-Ley. The proposed method has been developed to be used for naturally fractured reservoirs with different geometries. This method does not involve the use of any chart and by us- ing the pseudo steady state flow regime, the influence of wellbore storage on the value of the parameters ob- tained from this technique is negligible. In this technique, all the parameters can be obtained directly while in conventional approaches like type curve matching method, parameters such as co and g should be ob- tained by other methods like build-up test analysis and this is one of the most important advantages of this method that could save time during reservoir analyses. Different simulated and field examples were used for testing the proposed technique. Comparison between the obtained results by this approach and the results of type curve matching method shows a high performance of decline curves in well testing.

关键词： naturally fractured reservoirs rate transient decline curve analysis well testing pseudo-steady state condition bounded reservoirs.

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