application of decline analysis in fractured reservoirs, field case studies

Authors

azim kalantari asl

hamid reza nasriani

mohammad hosein zareenejad

abstract

decline curve analysis has some advantages over transient well test analysis in which it is not required to shut-in the well and also wellbore storage effects do not exist. few studies have been done on decline curve analysis of naturally fractured reservoirs but there are even some limitations with available models. on the other hand well test could be expensive and in some operational conditions shutting the well to obtain reservoir parameters is almost impossible. therefore, investigating the applicability of homogenous reservoir decline models for production data analysis of naturally fractured reservoirs is necessary. in this paper the most important decline models have been used to evaluate reservoir parameters in three iranian naturally fractured reservoirs and the results have been compared to transient well test analysis. a useful and applicable procedure is also introduced to correct the initial production data when they do not have necessary conditions. the results show that agarwal-gardner and blasingame type curves predict acceptable values for permeability compared to transient well test analysis while fetkovich type curve cannot predict accurate values. determined skin values in all wells of the three studied reservoirs are negative. negative values can be considered to be affected by existing fracture networks in the vicinity of producing wells and also periodic well stimulations. the results also show that neglecting produced condensates of gas condensate reservoirs with liquid-gas ratio (lgr) less than 100 bbl/mmscf cannot significantly affect decline curve analysis results.

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

Application of Decline Analysis in Fractured Reservoirs, Field Case Studies

Decline curve analysis has some advantages over transient well test analysis in which it is not required to shut-in the well and also wellbore storage effects do not exist. Few studies have been done on decline curve analysis of naturally fractured reservoirs but there are even some limitations with available models. On the other hand well test could be expensive and in some operational conditi...

full text

Application of Decline Curve Analysis for Estimating Different Properties of Closed Fractured Reservoirs for Vertical Wells

In this paper, decline curve analysis is used for estimating different parameters of bounded naturally fractured reservoirs. This analysis technique is based on rate transient technique, and it is shown that if production rate is plotted against time on a semi-log graph, straight lines are obtained that can be used to determine important parameters of the closed fractured reservoirs. The equati...

full text

Foam Application in Fractured Carbonate Reservoirs: A Simulation Study

Fractured carbonate reservoirs account for 25% of world’s total oil resources and for 90% of Iranian oil reserves. Since calcite and dolomite minerals are oil wet, gas oil gravity drainage (GOGD) is known as the most influencing production mechanism. The most important issue within gas injection into fractured media is the channeling problem which makes the efficiency of gas injection process e...

full text

Rate Decline Analysis of Vertically Fractured Wells in Shale Gas Reservoirs

Based on the porous flow theory, an extension of the pseudo-functions approach for the solution of non-linear partial differential equations considering adsorption-desorption effects was used to investigate the transient flow behavior of fractured wells in shale gas reservoirs. The pseudo-time factor was employed to effectively linearize the partial differential equations of the unsteady flow r...

full text

capillary continuity in fractured oil reservoirs

<span style="font-family: MSTT31c3f700; font-size...

full text

Characterization of Fractured Reservoirs

Reliable, predictive models to optimize carbonate reservoir performance

full text

My Resources

Save resource for easier access later


Journal title:
journal of chemical and petroleum engineering

Publisher: university of tehran

ISSN

volume 46

issue 1 2012

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023