جستجوی مقالات مرتبط با کلیدواژه « میدان نفتی اهواز » در نشریات گروه « مهندسی شیمی، نفت و پلیمر »

Total organic carbon (TOC) is one of the important parameters in source-rock geochemical studies. This important parameter is measured by Rock-Evel pyrolysis. This method is more accurate, but it requires high cost and time. This research has proposed a modern hybrid model for the estimation of TOC. PSO-BP hybrid model is an evaluated algorithm by combining particle swarm optimization (PSO) with back propagation (BP) algorithms. The algorithm with high correlation finds the relation between 4 petrophysical logs (GR, CNL, LLD, and DT) with amount of TOC. In this case study, source rock samples from Pabdeh, Gourpi and Kajdomi formations in the Ahwaz oilfield are interested. Results show that there is high correlation between estimated TOC by PSO-BP model and measured TOC by Rock-Eval pyrolysis. The correlation of the results with previously studies demonstrates that PSO-BP model is more applicable than the individual algorithms or recently similar combined models in the Ahwaz oilfield.

One of the important geochemical parameters used to evaluate the hydrocarbon potential of source rock is total organic carbon (TOC). TOC measurement is time-consuming and rather expensive and considerable number of drill hole samples including core or cuttings have to be analyzed. In this study, TOC values were estimated initially using petrophysical logs generally available from drilled wells. For this purpose, an ant colony system was used based on hierarchical clustering analysis. The first stage was comprised of hierarchical clustering and the second stage included ant colony system, which was designed continuously with a normal probability distribution function. Continuous ant colony system (CACS) calculated weight coefficients of nonlinear proposed function for the petrophysical data of each cluster. The results show that this algorithm has a successful performance in combination with clustering for the estimation of TOC log. Using these coefficients and petrophysical data, TOC log can be generated for other wells in this field. This study is based on the data collected from three wells of the Ahwaz oilfields and can be generalized to other developmental wells.

Shales are found in over 75 % of drilled profiles and create 90 % of wellbore stability problems. During drilling in shale formation using numerical and analytical methods and considering correct and logical parameters one can decrease the costs of wellbore walls instability. This study has been performed on the effect of physical and geomechanical properties of shale on wellbore stability in one of Iranian oil fields. In this study, a stability analysis of unstable shales has been done in a well section by numerical (FESTO3 software) and analytical methods. The mud weight window for different states of in situ stresses was suggested using analytical method. One of these states was studied and the optimum mud weights were proposed by numerical method and the results were compared. The research shows that understanding the state and magnitude of principal stresses can drastically affect the analyses.