List of Articles
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Open Access Article
1 - Estimation of relative permeability curves from capillary pressure data in one of iranian carbonate reservoir
بابک شعبانی عزت اله کاظم زادهRelative permeability can be measured directly from cores, but due to problems such as unavailability of experimental results of direct relative permeability measurement, indirect techniques also have been used to calculate relative permeability. One of these methods is MoreRelative permeability can be measured directly from cores, but due to problems such as unavailability of experimental results of direct relative permeability measurement, indirect techniques also have been used to calculate relative permeability. One of these methods is estimating relative permeability curves from capillary pressure data that the reliability of this method for approximation of liquid-gas relative permeability curves had thoroughly investigated. However, there is not enough information to conclude which method is the standard one for calculating oil-water relative permeability curves. Various capillary pressure techniques such as the Corey, Brooks-Corey, Li-Purcell and Li-Burdine methods were utilized to calculate oil-water relative permeabilities using the measured oil-water capillary pressure data in drainage process in an oil-wet Carbonate reservoir. Despite wide popularity of Purcell and Burdine methods for calculating relative permeability, new Li-Purcell and LiBurdine methods were used. The calculated results were compared to the experimental data of oil-water relative permeabilities measured in a Carbonate reservoir. The Corey and Brooks-Corey models are shown an acceptable and nearly exact match with the measured oil relative permeability values. However, the Li-Purcell and Li-Burdine models underestimate the values for wetting phase in most cases. It is also worth mentioning that, except Li-Purcell method, the results of all other methods for calculating non-wetting phase relative permeability are almost the same and overestimate the values. Then, rock typing on the basis of pore throat radius at 35% mercury saturation were done and the accuracy of each model were examined for all rock types. Results of this work revealed that calculation of oil-water relative permeability using the capillary pressure data is also a reliable technique in oil-wet carbonate reservoirs. Manuscript profile -
Open Access Article
2 - Reservoir fluid type identification from petrophysical logs using pattern recognition methods
امیر ملا جان حسین معماریان بهزاد تخم چیIdentifying the type and distribution of reservoir fluids is one of the main things on well logging logs and well testing. Several methods have been proposed to identify the type of reservoir fluids that in general, it can be divided into two groups of methods; direct ( MoreIdentifying the type and distribution of reservoir fluids is one of the main things on well logging logs and well testing. Several methods have been proposed to identify the type of reservoir fluids that in general, it can be divided into two groups of methods; direct (e.g. well testing) and indirect methods (e.g. seismic and log interpretation). Petrophysical logs due to their high resolution and more conformity are more frequently used than seismic data. This study aims to identify reservoir fluid types in PLs, based on 3 classes of oil, oil-water and water, in carbon reservoir. Suggested method applies wavelet decomposition as well as classification and was applied to PLs in five wells of an oil field in southwestern Iran. Eventually, obtained results have been evaluated by well testing responses. Manuscript profile -
Open Access Article
3 - Geochemical analysis &petrophysical studies: An approach to clay minerals investigation of E member of Qom Formation, Sarajeh gas field
عباس دهکار سهیلا اصلانیGeochemical and petrophysical studies on E member of Sarajeh Gas field shows presence of different type of clay minerals. Petrography studies along with XRD , SEM and EDX analysis on the present samples, indicate presence of Illite, Chlorite and expandable clay mine MoreGeochemical and petrophysical studies on E member of Sarajeh Gas field shows presence of different type of clay minerals. Petrography studies along with XRD , SEM and EDX analysis on the present samples, indicate presence of Illite, Chlorite and expandable clay minerals. Expandable clays comprise, smectite and mixed layer or interstratified Illite/Smectite (I/S) minerals. Petrophsical studies show Th/K on NGS log in Sarajeh, well 12, composed mainly, Illite, chlorite with minor amount of interstratified Illite/Smectite (I/S). Geochemical studies confirm validity of petrophysical results. The presence of different clay minerals of Qom formation in E member, Sarajeh Gas field, may have significant impact on petrophysical properties of reservoir, and hence affect reservoir productivity as well as cause problem during drilling operations. Manuscript profile -
Open Access Article
4 - Effect of multi-walled carbon nanotubes to improve hydrocarbon wells annular clearance space
Mohammad سلیمانی سعیده رعیت دوستProper drilling fluids has vital role for achieving to hydrocarbon reservoirs by using Drilling operation. Some important problems such as friction, stuck pipe, slow drilling rate, high torque and drag, lost of materials, density variation of mud can be happened due of MoreProper drilling fluids has vital role for achieving to hydrocarbon reservoirs by using Drilling operation. Some important problems such as friction, stuck pipe, slow drilling rate, high torque and drag, lost of materials, density variation of mud can be happened due of poor hole annulus and cuttings down falling that induce expensive drilling. Various drilling fluids have been widely used in the wells drilling to improve lifting capacity of drilled cuttings. In this paper, the experimental results have been studied that conducted on effect of Multiwall Carbon Nano tubes (MWNTs) as additives for lifting capacity of water based mud. The effect of Useful parameters such as amount of MWNTs used, cutting size and mud annular velocity on the drilling fluid cleaning capacity have been studied. The results show that lifted cuttings increase as the amount of MWNTs added increases. MWNTs associated with water based mud displays the stability against base mud since surface forces easily balance the gravity force and attached to drilled cuttings, resulting in increase of drag force acts to drilled cuttings and easily lifted cuttings to the surface. The MWNTs also will improve viscosity which will significantly increase carrying capacity of the mud. For small and medium cuttings, the improvement relatively simplified compare to the big cuttings. The impact will significantly Manuscript profile -
Open Access Article
5 - در این مقاله به بحث وبررسی تکنولوزی حفاری با لیزر که اساسی ترین جایگزین برای حفاری دورانی می باشد ،پرداخته می شود ما ابتدا با تاریخچه کوتاهی از آزمایشاتی که قبلا در موسسات دیگر انجام شده است می پردازیم .در ادامه با ذکر پارامتر های موثر بر روی کاهش مقدار انرزی مخصوص سنگ ودر نتیجه افزایش مقدار سرعت حفاری ف به بررسی این موارد خواهیم پرداخت .موضوع دیگری که در این آزمایش به آن اشاره خواهد شد ،تاثیرات لیزر بر روی سرعت حفاری ،هزینه های حفاری وهم چنین محیط زیست می باشد .ودر آخر با داده هایی که از آزمایشات مختلفی که در طی این تحقیق بدست آمده است اثبات خواهد شد که این نوع حفاری نوین می تواند جایگزین مناسب ومقرون به صرفه ای به جای حفاری دورانی باشد .حفاری با لیزر یکی از راه کار های موثر ومناسب جهت حفاری وعملیات مشبک کاری سازند های سخت ومتراکم با عمق زیاد می باشد .یکی از مزایای استفاده از لیزر جهت حفاری چاه های نفت وگاز ،توانائئ کاهش مدت زمان حفاری می باشد .در حفاری با لیزر به جهت تماس نداشتن با سطح سنگ در حین حفاری وجلو گیری از توقف حفاری برای تعویض مته ، در مدت زمان حفاری صرفه جوئی عمده ای صورت خواهد گرفت .
مهدی بیدار بخت محسن قربانخانی محمد رضا کاظمی اسفه مهدی علی محمدیThe paper is an update to the current status of laser drilling technique – the first fundamental change to rotary drilling. We begin with a brief history of already experiment which performed by another institutes. Next, we will discuss about effective parameters on red MoreThe paper is an update to the current status of laser drilling technique – the first fundamental change to rotary drilling. We begin with a brief history of already experiment which performed by another institutes. Next, we will discuss about effective parameters on reduce specific energy thereupon increase rate of penetration. Stress has been put on the effect of laser drilling on rate of penetration, drilling costs, and waste management that we discuss about these things in this research. Finally, experiments show that this advanced laser drilling technique can be efficient and economically for exchange with current rotary drilling. Laser drilling is found to be more efficient way to drill and perforate wells through hard rock formations encountered at greater depth. One of the major advantages of laser drilling is its potential to reduce drilling time. Laser cut drilling time reduced by not contacting the rock, eliminating the need to stop and replace a bit. Manuscript profile -
Open Access Article
6 - Using information entropy theory and bayesian decision method to identify appropriate parameters for evaluating and discriminating oil facies (mansuri oil field, south of Iran)
حسین معماریانDue to subsurface heterogeneity and existing vagueness in geophysical interpretation, identifying and interpretation of facies in wellbores is always prone to uncertainty and risk. Nowadays several methods have developed for quantitative facies interpretation. These met MoreDue to subsurface heterogeneity and existing vagueness in geophysical interpretation, identifying and interpretation of facies in wellbores is always prone to uncertainty and risk. Nowadays several methods have developed for quantitative facies interpretation. These methods are generally divided into deterministic and stochastic categories. Deterministic methods, in spite of their simple modeling procedure, cannot expose the amount of error or accuracy of the model. On the other hand, stochastic methods, in addition to quantifying the error of the model, can provide the probability of the model’s accuracy in each point of the reservoir. The Bayesian approach is one of the stochastic methods that use conditional probabilities for modeling. This approach, as well as probabilistic modeling of hydrocarbon facies, quantitatively computes the effect of additional data in decreasing the error of the classification. Information entropy theory, by quantifying the intrinsic uncertainty in each model input parameter, can easily provide the selection of valuable parameters. The present study was carried out on one of the wells of Mansuri oil field, south of Iran. After generation of training data by using rock physics techniques and Gassmann’s relation, the value of each input parameter was identified by entropy analysis. Then, by use of Bayesian analysis and valuable parameters, oil facies classification and discrimination was implemented. The five optimum parameters were elastic impedance, compressional wave velocity, shear wave velocity, density and porosity .The amount of error in this method is approximated to be 11 percent. This investigation also showed that gamma ray parameter does not have a drastic positive effect on identification and discrimination procedure of oil facies, which has a good agreement with the results of entropy analysis . Manuscript profile -
Open Access Article
7 - The effect of shale minerals on the permeability anisotropy of carbonate reservoir rocks in the south-west of Iran
The vertical permeability of reservoir rocks is of paramount importance in production strategies, EOR studies and reservoir management. The carbonate reservoirs are inherently heterogeneous and vertical permeability is different from horizontal permeability. This perm MoreThe vertical permeability of reservoir rocks is of paramount importance in production strategies, EOR studies and reservoir management. The carbonate reservoirs are inherently heterogeneous and vertical permeability is different from horizontal permeability. This permeability anisotropy depends on deposition history and diagenesis, type and amount of shale present in the formation and compressibility of the rock. In this study the effect of clay minerals has been investigated on the permeability anisotropy of Dalan formation in one of the South-West reservoirs of Iran using core Gamma log. For this purpose 233 core plug samples from 3 wells were selected and their petrophysical properties were measured. Natural gamma of the samples, including thorium and Potassium, was also measured by a core gamma logger and the samples were separated into 3 groups reach in Chlorite, Kaolinite and Montmorillonite clay minerals. Then vertical permeability of each group of shale-type was plotted against the mean hydraulic radius of horizontal samples and empirical equations of their permeability anisotropy were obtained. There was a good match between predicted and measured vertical permeability of some core plugs from another well in the reservoir. The studies indicated that permeability anisotropy is gradually increased with increasing porosity and the core samples containing Kaolinite have the most permeability anisotropy and the ones containing Montmorillonite have the least anisotropy. Manuscript profile -
Open Access Article
8 - Geochemical evaluation of source rocks in the Kilur Karim oilfield, Southwest of Iran
هاشم صراف دختKilorkarim oilfield is located in 40 Km North of the Persian Gulf and in the vicinity of Siah Makan, Golkhari, Bibi Hakeemeh oilfields. The present study focuses on geochemical evaluation of probable source rocks in this oilfield. For this purpose, source rock samples t MoreKilorkarim oilfield is located in 40 Km North of the Persian Gulf and in the vicinity of Siah Makan, Golkhari, Bibi Hakeemeh oilfields. The present study focuses on geochemical evaluation of probable source rocks in this oilfield. For this purpose, source rock samples that selected from three wells were evaluated using Rock-Eval pyrolysis and reconstruction of burial history modeling. The results show that organic matter of these source rocks are mostly a mixture of Kerogen types II and III. Also organic petrography study showed that Vitrinite, Detrovitrinite, Hominite and Fuzinite macerals in Pabdeh, Gurpi and Kazhdomi Formations, and reworked Bitumen in some sections of the Pabdeh Formation. Based on Vitrinite Reflectance measurments in well#1, Pabdeh and Gurpi Formations aren’t interred in oil window and Kazhdumi Formation interred in oil window. In well#2 Pabdeh and Gurpi Formations are in the beginning and in oil window, respectively. In well#4 Vitrinite Reflectance is emphasized the entrance of Kazhdumi Formation into oil window. Reconstruction of Burial history and thermal modeling was performed by PBM 1D software. Modeling showed that Pabdeh Formation in well #1 and 4a interred in oil window but the opposite is true for middle section of well #2. Because of more deposition of Aghajari Formation in the south part, oil window occurs in shallower depth and therefore the maturity is higher in the south toward north of the oilfield. Manuscript profile