توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱A Modified Choke Flow Correlation for Iranian Gas Condensate Wells
اطلاعات انتشار: اولین همایش ملی فناوری های نوین در صنایع نفت و گاز، سال
تعداد صفحات: ۶
Flow through a surface choke can be described as either critical or sub–critical. Most of the correlations available to petroleum engineers are for critical flow but in lots of high rate gas\condensate wells subcritical flow occurs in large choke sizes. Field data of fifteen high rate wells producing from ten gas condensate reservoir located in Iran were used to develop a general Gilbert type formula obtained by non–linear regression of data points for gas condensate wells. The present study develop a general Gilbert type formula for gas condensate wells, flowing through differentlarge choke sizes between 40\64 in. and 192\64 in. under subcritical flow conditions in order to develop empirical correlations to be applied to predict gas flow rates under wide range of flow conditions usually encountered during the flow of gas condensates through wellhead chokes in wells. A comparison between the measured data and observed data is done with five different errors parameters. The results of this study could be considered in the design and implementation of deliverability tests, pressure transient tests, well control, and long–term well production of high rate gas condensates wells.<\div>

۲Rock Typing and Generalization of Permeability– Porosity Relationship for a Carbonate Tight Gas Reservoir
اطلاعات انتشار: اولین همایش ملی فناوری های نوین در صنایع نفت و گاز، سال
تعداد صفحات: ۸
Reservoir characterization methods are very important as they provide a better description of the storage and flow capacities of a hydrocarbon reservoir; moreover it plays crucial role in reservoir simulation models. Carbonate reservoirs show challenges to engineers and geologists to characterize because of their tendency to be tight and generally heterogeneous due to depositional and diagenetic processes. Among the various quantitative rock– typing techniques presented in the literature, the hydraulic flow unit method (RQI\FZI) is more widely used. ‘D’ is a main carbonate formation for one of the giant gas reservoir in Iran. In this study, available routine core data from four wells are assembled to develop mproved generalized permeability porosity relationship for characterize ‘D’ formation by (HFU) concept. For this purpose, three wells are considered to develop HFU transforms for ‘D’ formation. Correlation accuracy of each discrete rock type (DRT) was very good (R2>0.9) for orizontal permeability. Then all data from different wells were combined to determine generalized porosity permeability relationship for ‘D’ formation. This transform was tested for its accuracy on available core data of fourth well which exist in the same formation. Calculated permeability data by HFU technique matched very well with the routine core data which confirm the accuracy of generalized HFU transform. In the same manner, generalized vertical permeability relationship was developed for ‘D’ formation and tested for its accuracy.<\div>

۳Application of Decline Analysis in Fractured Reservoirs, Field Case Studies
اطلاعات انتشار: Journal of Chemical and Petroleum Engineering، چهل و ششم،شماره۱، ، سال
تعداد صفحات: ۱۰
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.
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