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 Arabian Journal for Science and EngineeringJournal Prestige (SJR): 0.303 Citation Impact (citeScore): 1Number of Followers: 5      Hybrid journal (It can contain Open Access articles) ISSN (Print) 1319-8025 Published by Springer-Verlag  [2350 journals]
• Optimization Study of Operation Parameters for Extracting $$\hbox {Cu}^{2+}$$ Cu 2 + from Sulfuric Solution Containing $$\hbox {Co}^{2+}$$
Co 2 + with LIX984N in a Laminar Microchip
• Authors: Bi-quan Xiao; Feng Jiang; Jin-hui Peng; Shao-hua Ju; Li-hua Zhang; Shao-hua Yin; Li-bo Zhang; Lei Xu; Shi-hong Tian
Pages: 2145 - 2153
Abstract: Copper and cobalt usually coexist in the leachate of waste lithium ion batteries, sea nodules and other copper ore or by-product. Conventional methods for the separation of copper and cobalt hardly avoid some defects, such as longer extraction time, co-extraction and too many stages. In this paper, a microfluidic extraction procedure for simultaneously separating copper $$(\hbox {Cu}^{2+})$$ and cobalt $$(\hbox {Co}^{2+})$$ ions in a microchannel was investigated. In addition, some key operation parameters, such as initial pH, volume flow rate and extractant concentration, were optimized by a method of response surface methodology (RSM). The result showed that under the optimized operation parameters of initial pH of 2.5, volume flow rate of $$0.035~\hbox {mL}~\hbox {min}^{-1}$$ and extractant concentration of 17.36%, the extraction rate of copper could be as high as 96.73%, with a low cobalt extraction rate, which was only 2.41%.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2495-1
Issue No: Vol. 43, No. 5 (2018)

• The Effect of Vertical Vibrations on Heat and Mass Transfers Through
Natural Convection in Partially Porous Cavity
• Authors: El-hachemi Zidi; Abdelmalek Hasseine; Noureddine Moummi
Pages: 2195 - 2204
Abstract: This paper presents a numerical analysis on natural thermosolutal convection in a rectangular enclosure filled partially and vertically by a porous layer and subjected to a vertical vibration. The Brinkman–Extended Darcy equation is used for modeling the fluid flow through the porous section in the enclosure. The effect of vertical vibrations on the flow structure, heat and mass transfers for various porous layer thicknesses are presented graphically. It is observed that vertical vibration decreases the flow intensity and the fluid penetration into porous section. It is also observed that the increase of vibration intensity has a decreasing effect on both heat and mass transfer rates. This decreasing effect becomes more important for lower porous section ratios. These findings show that the vibration effect can be used beneficially in many engineering applications where operation is conducted under restricted permeability and temperature gradients.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2560-9
Issue No: Vol. 43, No. 5 (2018)

• Fixed-Bed Adsorption of Ranitidine Hydrochloride Onto Microwave
Assisted—Activated Aegle marmelos Correa Fruit Shell: Statistical
Optimization and Breakthrough Modelling
• Authors: N. Sivarajasekar; N. Mohanraj; R. Baskar; S. Sivamani
Pages: 2205 - 2215
Abstract: In this study, the feasibility of using microwave-irradiated Aegle marmelos Correa fruit shell was investigated in a fixed-bed column towards sorptive removal of ranitidine hydrochloride (RH) from simulated aqueous solution. Characterizations of adsorbent such as SEM, point of zero charge, BET surface area, Boehm surface functional groups, thermal and elemental analysis were carried out. Box–Behnken response surface methodology was utilized to optimize the process parameters such as influent flow rate (2.5–4.5 ml min−1), initial RH concentration (100–200 mg l−1), adsorbent particle size (0.082–0.20 mm), and fixed-bed height (5–10 cm). The highest fixed-bed adsorptive removal of RH at optimum conditions viz. bed height 9.19 cm, initial RH concentration 184.94 mg l−1, flow rate 3.76 ml min−1 and adsorbent particle size 0.2 mm was estimated to be 72.86%. Fixed-bed adsorption experiments were carried out at optimum conditions obtained at different bed heights, and the data obtained were fitted into different kinetic models to predict the applicable breakthrough curve model. Dose–response model was observed to be the best suited model for mathematical description of RH removal in fixed-bed column studies over other selected models.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2565-4
Issue No: Vol. 43, No. 5 (2018)

• The Role of Cationic Coagulant-to-Cell Interaction in Dictating the
Flocculation-Aided Sedimentation of Freshwater Microalgae
• Authors: Pey Yi Toh; Nurfarah Farhana Azenan; Liherng Wong; Yin Sim Ng; Lee Muei Chng; JitKang Lim; Derek Juinn Chieh Chan
Pages: 2217 - 2225
Abstract: The coagulant chitosan and poly(diallyldimethylammonium chloride) (PDDA) were proven effective to aid the sedimentation of microalgal cells through electrostatic patch flocculation. A total amount of 30 mg/L chitosan and PDDA can achieve cell separation efficiency of $$96.7 \pm 0.7$$ and $$98.4 \pm 1.0$$ %, respectively. The chitosan outperformed PDDA and promoted 4.4 times faster rate of cell sedimentation than the self-sedimentation rate of cells. The chitosan employed the mechanism of charge neutralization to form larger flocs, while the PDDA that favored the formation of loops and tails protruding away from cell surface employed the bridging mechanism to form flocs. The rate of cell sedimentation induced by chitosan was the highest at pH 7, 8 (control) and 9 compared to that of PDDA, where the cell flocculation by using chitosan was dominated by charge neutralization mechanism at pH 7 and 8 (control), while the cell flocculation was mainly driven by bridging mechanism at pH 9. This result shows that the chitosan is feasible in the harvesting of freshwater microalgae without the need of pH adjustment. Therefore, the chitosan was proven more reliable and time effective than the PDDA in harvesting the freshwater Chlorella sp. without the need of pH adjustment.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2584-1
Issue No: Vol. 43, No. 5 (2018)

• CFD Simulation of the Distribution of Pressure and Shear Rate on the
Surface of Rotating Membrane Equipped with Vanes for the Ultrafiltration
of Dairy Effluent
• Authors: Soufyane Ladeg; Zhenzhou Zhu; Nadji Moulai-Mostefa; Luhui Ding; Michel Y. Jaffrin
Pages: 2237 - 2245
Abstract: This paper reports computational fluid dynamics (CFD) studies on the performance of flow inside a rotating disk filtration module. This module consists of a disk rotating at speeds between 1000 and 3000 rpm inside a cylindrical housing equipped with a stationary circular flat membrane. In order to investigate the influence of surface geometry, a smooth disk and a disk equipped with vanes were used. Commercial CFD software was utilized for the characterization of the flow inside the membrane module. The predicted results were compared at different values of rotating and inlet velocities with previous works and also with experimental ones obtained in the filtration of dairy effluent in the same conditions. The influence of the geometry of the disk was also evaluated. The obtained results show that an increase in rotating velocity leads to an increase in the pressure and shear stress at the membrane surface. The highest pressures were obtained when using disks equipped with vanes, this was due to the turbulent area created between the vanes visualized in animated views. It was also found that the presence of vanes on the surface of disk has a great effect on the shear stress; it contributes to the reduction in fouling and improvement in filtration flux.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2645-5
Issue No: Vol. 43, No. 5 (2018)

• Determination of Mass Transfer Coefficients on the Obtaining of Caffeine
from Tea Stalk by Supercritical Carbon Dioxide With and Without Ethanol
• Authors: Hacer İçen; Metin Gürü
Pages: 2257 - 2262
Abstract: This study deals determination of mass transfer coefficients on the obtaining of caffeine from tea stalk wastes by supercritical carbon dioxide extraction. Tea stalk wastes of Turkish tea plants that have no economical value were employed as raw material throughout determination of mass transfer experiments. Mass transfer coefficients were calculated at the caffeine extraction experiments with and without cosolvent. For this purpose, ethanol was pumped to the supercritical carbon dioxide extraction system as a cosolvent. In these experimental studies, extraction procedures were repeated at different temperature by keeping optimum conditions at specified the previous study. Optimized parameters in the caffeine leaching from tea stalks were fixed throughout the study such as pressure of 250 bar, the average particle size of 0.202 mm, $$\hbox {CO}_{2}$$ flow rate of 10 g/min (5.23 g ethanol/100 g $$\hbox {CO}_{2})$$ . Correlation was obtained from retention time in order to calculate mass transfer coefficient. Using the correlation, coefficients were calculated in supercritical $$\hbox {CO}_{2}$$ extraction with and without ethanol at 333 K temperature, $$k_\mathrm{L}=3.782\times 10^{-8}\,\hbox {m}/\hbox {min}$$ , $$k_\mathrm{L}=1.591\times 10^{-8}\,\hbox {m}/\hbox {min}$$ , respectively. Consequently, it has been observed that mass transfer coefficient is increased approximately 2.4 times when ethanol is utilized the amount of 5% besides of 95% $$\hbox {CO}_{2}$$ . On the other hand, more caffeine can be extracted in a shorter period by means of ethanol pumping as cosolvent.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2684-y
Issue No: Vol. 43, No. 5 (2018)

• Transpiration Effects on MHD Flow Over a Stretched Cylinder with
Cattaneo–Christov Heat Flux with Suction or Injection
• Authors: C. S. K. Raju; R. V. M. S. S. Kiran Kumar; S. V. K. Varma; A. G. Madaki; P. Durga Prasad
Pages: 2273 - 2280
Abstract: A theoretical analysis is performed for investigating the flow and heat transfer characteristics of Maxwell fluid over a stretching cylinder with Cattaneo–Christov, heat source or sink, and suction/injection. The solution to the transformed similarity equations is derived using Runge–Kutta fourth-order method along shooting technique. The present result for both the surface shear stress and the local Nusselt number is validated with the previously published results, while a very sound agreement is attained. The impacts of the distinct parameters related to this study are presented in graph and tabular form, respectively. Moreover, the local Nusselt number and surface shear stress have been computed for both the suction and injection cases. It is found that strengthening the thermal relaxation parameter value increases the heat transfer rate. The dimensional heat transfer rate is observed being rising in the injection case when compared with the suction case.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2687-8
Issue No: Vol. 43, No. 5 (2018)

• Thin Reaction Zone Model for Evaluating the Mechanisms that Control the
Char Gasification Process: 1. Quasi-steady State
• Authors: Takdir Syarif; Hary Sulistyo; Wahyudi Budi Sediawan; Budhijanto
Pages: 2291 - 2298
Abstract: Reaction mechanism takes place in char gasification was tested by kinetic studies. A modified kinetic model (thin reaction zone model) was developed to evaluate the mechanisms controlling the process of gasification. The model was compared to the experimental data of char gasification using steam as gasification agent. The gasification was carried out at 600– $$800\,{^{\circ }}\hbox {C}$$ for 60 min. The model assuming the mass transfer of steam through the ash layer controls the reaction rate work well. The average error at operating temperatures of 600, 700, and $$800\,{^{\circ }}\hbox {C}$$ was 2.89, 1.75, and 3.26% respectively.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2735-4
Issue No: Vol. 43, No. 5 (2018)

• Investigating the Compatibility of Enzyme with Chelating Agents for
Calcium Carbonate Filter Cake Removal
• Authors: Salaheldin Elkatatny; Mohamed Mahmoud
Pages: 2309 - 2318
Abstract: Removal of water-based filter cake formed during drilling and hydraulic fracturing operations is a difficult task. Conventional acids, such as hydrochloric acid, organic acid, or a mixture of these acids, can be used to remove the filter cake. The common issues of these acids are rapid and uncontrolled reaction rate and corrosion to well tubulars, especially in horizontal and deep wells. Chelating agents were introduced in the oil industry to solve the problems associated with the conventional acids. Up to the authors’ knowledge, the reaction of chelating agents with starch, which is a major component of the filter cake, was not investigated in the literature. The objectives of this study are to (1) assess the reaction of starch with different chelating agents, namely ethylenediaminetetraacetic acid (EDTA), glutamic acid diacetic acid (GLDA), and diethylene triamine penta-acetic acid (DTPA), at different conditions of pH and temperature, (2) evaluate the compatibility of chelating agents with enzyme [high thermally stable $$\upalpha$$ -amylase enzymes (HTA)], (3) assess the reaction of enzyme with starch and xanthan gum, and (4) design the best scenario for calcium carbonate filter cake removal. The obtained results showed that EDTA (20 wt%, pH 7, and 12), DTPA (20 wt%, pH 7, and 12), and GLDA (20 wt%, pH 4, 7, and 12) were not able to break the starch after hot rolling for different time periods at $$200\,{^{\circ }}\hbox {F}$$ . Different chelating agents were found to be incompatible with $$\upalpha$$ -amylase enzyme (HTA enzyme that should be used to remove the starch). The two-stage scenario was found to be the best practice to remove the calcium carbonate filter cake in 22 h with 100% removal efficiency and 100% retained permeability. Computer tomography confirmed that external and internal filter cake was completely removed, and no formation damage was existing.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2727-4
Issue No: Vol. 43, No. 5 (2018)

• Aluminium Leaching by Heterotrophic Microorganism Aspergillus niger : An
Acidic Leaching'
• Authors: Martin Urík; Filip Polák; Marek Bujdoš; Ivana Pifková; Lucia Kořenková; Pavol Littera; Peter Matúš
Pages: 2369 - 2374
Abstract: Bioleaching of aluminium mineral boehmite by filamentous fungus Aspergillus niger was compared to chemical leaching by citric, oxalic and hydrochloric acids to evaluate the significance of A. niger’s metabolites on aluminium mobilization from this natural component of the aluminium ore. Our results highlighted that leaching efficiency of hydrochloric acid at pH 2 was 2.7 times lower compared to fungal bioleaching efficiency. When the organic acids were compared, oxalic acid was a stronger aluminium leaching agent than citric acid. The results suggest that fungal metabolites significantly promoted the release of aluminium and that their acidic properties, despite being useful, were not the most critical factor in the bioleaching of aluminium.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2784-8
Issue No: Vol. 43, No. 5 (2018)

• Sintering and Coking: Effect of Preparation Methods on the Deactivation of
$$\hbox {Co}$$ Co – $$\hbox {Ni/TiO}_{2}$$ Ni/TiO 2 in Fischer–Tropsch
Synthesis
• Authors: Mahboobeh Dowlati; Nasibeh Siyavashi; Hamid Reza Azizi
Pages: 2441 - 2450
Abstract: The main challenge of this work is study effect of preparation methods, co-precipitation and sol–gel, on the deactivation of $$\hbox {Co}$$ – $$\hbox {Ni/TiO}_{2}$$ catalysts in Fischer–Tropsch synthesis. Revealed that coking and sintering are two main mechanisms which have a significant influence on the deactivation of the catalyst. The catalysts were tested under industrially conditions ( $$T=350\,{^{\circ }}\hbox {C}$$ , $$P=10\,\hbox {bar}$$ , $$\hbox {H}_{2}/\hbox {CO}=2$$ and $$\hbox {GHSV}=7200\,\hbox {h}^{-1})$$ and during 300 h on stream. Although CO conversion and product selectivity were similar for both catalysts, the sample prepared by co-precipitation method showed a better catalytic performance. The mechanisms of deactivation were interpreted using TPR, TEM/EDS and XRD techniques. Depicted that coking and sintering are two predominate mechanisms for deactivation of co-precipitation and sol–gel catalysts, respectively.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2845-z
Issue No: Vol. 43, No. 5 (2018)

• Thermodynamic Study and Optimization a Nano-Zeolite for Dehydration Liquid
Fuel (DMAZ) Using Taguchi $$\hbox {L}_{16}$$ L 16 Orthogonal Array
• Authors: Hamid Reza Azizi; Shahram Ghanbari Pakdehi; Saeed Babaee
Pages: 2465 - 2472
Abstract: In this research, a typical molecular sieve successfully was applied to liquid fuel dimethyl amino ethyl azide (DMAZ) dehydration which was synthesized using hydrothermal method. $$\hbox {L}_{16}$$ orthogonal array was used for experimental design, and the results were analyzed using analysis of variance. Initial concentration ( $${C}_{0})$$ , shaking rate (SR), temperature (T), and adsorbent dosage (AD) as controllable parameters were varied at four levels to found their effects on the capacity of synthesized zeolite (q). The AD and $${C}_{0}$$ parameters have been found to be the most significant parameter with 39.92 and 39.70% contribution to the q, respectively. The predicted and real adsorptive removal of water at optimum levels, $$C_{0}= 1.25\,\hbox {wt},\hbox { SR}=150\,\hbox {rpm, AD}=2.25\hbox { g}$$ , and $${T}=30$$ –35  $${^{\circ }}\hbox {C}$$ , were found to be 208.08 and 210.2, respectively. The values of thermodynamic parameters proved that dehydration of DMAZ using this zeolite has an exothermic character, physical, and spontaneous nature.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2891-6
Issue No: Vol. 43, No. 5 (2018)

• Performance of Horizontal Wells with Inflow Control Devices in Homogeneous
Reservoirs with Bottom Water Drive
• Authors: Qin Li; Jingnan Xiao; QuanShu Zeng; Christopher Xiao
Pages: 2473 - 2479
Abstract: Horizontal well techniques play an important role in the development of unconventional oil and gas plays. A key challenge in horizontal well completions is that water cut will rise rapidly once water breakthrough without inflow control. Inflow control devices restrict flow by creating an additional drop in pressure to equal the drop in wellbore pressure in order to reduce water or gas coning. Once a control device is installed in the wellbore, it is almost impossible to adjust. As a result, it is extremely important to understand the oil–water pressure profile and the long-term behavior of well completions with ICDs. We use the theory of dynamic simulation-coupled well-reservoir flow to analyze the performance of horizontal well completions with and without ICDs using the multi-segment well model. This study proposes a new single-flow wellbore model and develops the model of oil–water flow in horizontal wellbore with influx. The performance of horizontal well completions with ICDs in reservoir with water drive is analyzed on the basis of the new coupled reservoir–wellbore model. Simulation results show that water breakthrough first occurs near the heel of the horizontal well due to the drop in pressure in the wellbore by the end of water-free production period in the homogeneous reservoirs. We also point out that completion with ICDs can optimize production in horizontal wells with long production sections, low drawdown pressure and high production rates. In these situations, the effects of a drop in oil–water two-phase pressure are significant.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2551-x
Issue No: Vol. 43, No. 5 (2018)

• Prediction of Flammability Limits for Gases from the Decontamination
Evaporation–Condensation Process of Oil Sludge
• Authors: T. Hlincik; P. Buryan; Š. Buryan
Pages: 2481 - 2489
Abstract: In this paper, we focus on deriving mathematical description of flammability limits of gases released in the evaporation–condensation technological process during oil sludge decontamination. We have derived new relations that enable to express simultaneously dependence of both upper and lower flammability limits on gas temperature and reduced gas pressure. We also show that displaying the dependence of both limits in the form of 3D diagrams helps to clarify the determination of the undesirable technological conditions in situations where exhaustion of released flammable and toxic gases plays a significant role. Our representation makes it possible to quickly locate possible critical states in the construction designs, during apparatus selections, during induction of inertisation gas mixture, in the events of its failure, and also during selection of volume and composition of such gases.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2547-6
Issue No: Vol. 43, No. 5 (2018)

• Micelle Formation of Aerosol-OT Surfactants in Sea Water Salinity
• Authors: Azza Hashim Abbas; Wan Rosli Wan Sulaiman; Mohd Zaidi Jaafar; Agi Augustine Aja
Pages: 2515 - 2519
Abstract: Gemini surfactants group recently showed importance in screening techniques for the evaluation and selection of chemicals for enhanced oil recovery. Aerosol-OT (sodium bis (2-ethylhexyl) sulfosuccinate, AOT) is a versatile anionic Gemini surfactant which is widely used in the chemical and biophysical research, which is also included in the category of sulfonated hydrocarbons and shows high potential in laboratory experiments. In this paper, the micellar behaviour of anionic AOT in presence of high sodium salt concentration was studied at different temperature from (25–105) $$\,^{\circ }$$ C. Surface tension techniques using duoy ring were applied for each surfactant concentration to find the critical micelle concentration (CMC) at each temperature. Several thermodynamic parameters were also reported as the standard Gibbs energies of micellization, $$\Delta G^{0}$$ ; the standard enthalpy change of micellization, $$\Delta H^{0}$$ ; and the standard entropies of micellization, $$\Delta S^{0}$$ , were calculated from the temperature effect on the CMC. Results showed that CMC values increased with temperature. The enthalpy of micellization was found to be negative in all cases, and it showed a strong dependence on temperature in the AOT solution in the presence of high concentration of NaCl system.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2593-0
Issue No: Vol. 43, No. 5 (2018)

• Improving Oil Recovery Using Miscible Selective Simultaneous Water
Alternating Gas (MSSWAG) Injection in One of the Iranian Reservoirs
• Authors: Zohreh Dermanaki Farahani; Mohammad Reza Khorsand Movaghar
Pages: 2521 - 2535
Abstract: In the current investigation, feasibility study has been done for miscible selective simultaneous water alternating gas (MSSWAG) injection compared with immiscible and miscible water alternating gas (IWAG and MWAG) injection in one of the Iranian reservoirs which has been subject to water flooding for several years and the recovery factor (RF) for water flooding is about 23% of the original oil in place. Through IWAG injection, the effect of gas types comprising lean and rich has been investigated which led to increase the recovery factor to 29% for rich and 28% for lean gas. Moreover, miscible injection results show that the recovery factor for rich MWAG with optimized injection pore volume led to 41.74% which shows 12% greater values than the value for immiscible one. Also, sensitivity analysis represents that under rich MWAG injection with 1:2 WAG ratio and 100-day injection period, recovery factor has improved by 7% and reached 48.55%. In continuation to the study with emphasis on the advantages of miscibility, rich MSSWAG with RF: 54.73% has led to increase the recovery factor by 6% compared to rich MWAG with RF: 48.55% (being the best scenario in this study based on simulation results). Finally, considering the economic aspects, the net present value for rich MWAG and rich MSSWAG is significantly increased by approximately average 31% relative to water flooding.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2667-z
Issue No: Vol. 43, No. 5 (2018)

• Quantitative Description Method for Uncertainty of Formation Pore Pressure
• Authors: Ya-Nan Sheng; Zhi-Chuan Guan; Yu-Qiang Xu
Pages: 2605 - 2613
Abstract: Nowadays, the oil and gas exploration and development have been developed into the deep and complex formations. More and more abnormal pressure is encountered, which gives a great challenge to the safe and efficient drilling. Accurate description of pore pressure is of great significance to avoid drilling risk. The complexity of petroleum geology, the incompleteness of the logging or seismic data, the precision of the mathematical model and other issues can all lead to uncertainty in pore pressure prediction. The uncertainty of pore pressure is one of the fundamental causes for drilling risk. In order to address these challenges, a new quantitative description method for uncertainty of pore pressure was established. Firstly the sources of the pore pressure prediction uncertainty were analyzed. Then the uncertainties of Eaton index and normal compaction trend were, respectively, described. Finally the uncertainty interval of pore pressure was established based on Monte–Carlo simulation and normal information diffusion theory. The pore pressure prediction result obtained in this paper was not a single value, but an interval with probability distribution characteristic. The results of example showed that the measured values of pore pressure were all in pore pressure interval with confidence of 90%. Case study validated the feasibility and effectiveness of the proposed method.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2863-x
Issue No: Vol. 43, No. 5 (2018)

• Method of Predicting Tight Gas Deliverability from Conventional Well
Logging Data Based on Experimental Simulation
• Authors: Die Liu; Liang Xiao; Junran Li; Jun Lu
Pages: 2615 - 2623
Abstract: Gas deliverability estimation is very important in predicting effective gas-bearing regions and formulating reasonable development program. Conventional deliverability prediction method based on absolute open flow cannot be used in exploration wells due to the important input data of drill stem test (DST) data that cannot be first acquired. In this study, to establish reasonable model to predict exploration well deliverability, four core samples, drilled from the same tight sandstone reservoirs of northeast China, are applied for deliverability simulation experiment under formation condition. Gas flow rate and production data under different simulated drawdown pressures are acquired. A parameter of gas deliverability index, which is used to characterize gas production capability per well, is introduced. The relationships among gas deliverability index, reservoir physical properties (such as porosity, permeability and gas saturation) and drawdown pressure are analyzed. The results illustrate that for our target tight gas sandstone reservoirs, the optimal drawdown pressure is 5.0 MPa, and good relationship exists between gas deliverability index with the combined parameter of permeability and gas saturation. Based on this relationship, a model of predicting gas deliverability index from reservoir physical properties is established, and it is extended to field application to predict gas production. Comparison of predicted gas deliverability by using this model and acquired result from DST data illustrates the reliability of the established model.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2916-1
Issue No: Vol. 43, No. 5 (2018)

• A Polymer Injectivity Model Establishment and Application for Early
Polymer Injection
• Authors: Xiang’an Lu; Fan Liu; Guangwei Liu; Yanli Pei; Hanqiao Jiang; Jishuang Chen
Pages: 2625 - 2632
Abstract: In China, early polymer injection has been proved to be an effective way to enhance oil recovery in Bohai offshore field. Since the near wellbore controls injectivity, two-phase flow function needs to be appropriately accounted for to predict polymer injectivity. In this paper, we account for polymer rheology and water–oil two-phase flow in the polymer injectivity model. To properly describe the fluid distribution, we define five regions with unique saturation profiles during polymer flooding and then established a polymer injectivity prediction model for both monolayer and multilayer reservoirs. Compared to the traditional numerical simulation method, the new model improves the injectivity prediction efficiency in early polymer injection. The new model is basically a rapid semi-analytical numerical simulator that can predict the dynamic polymer injectivity based on several field data obtained during an early polymer flood.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2950-z
Issue No: Vol. 43, No. 5 (2018)

• Dynamic and Static Combination Method for Fracture-Vug Unit Division of
Fractured-Vuggy Reservoirs
• Authors: Yang Xiao; Zi-wei Zhang; Tong-wen Jiang; Zhen-zhong Cai; Xing-liang Deng; Jian-feng Zhou
Pages: 2633 - 2640
Abstract: Ying Mai-2 Block of Tarim Oil Field is a karst fractured-vuggy reservoir. Along with the research on well location demonstration and recovery ratio improvement in the developing progress, the importance of fracture-vug unit division is gradually revealed. This paper presents an integrated method for establishing a fractured element/flow unit in the oil field and discusses its importance and its influence on future well location optimization. With more dynamic data from the oil field, this workflow can be reused to divide the unit during the whole life of the well. This paper begins with the understanding and characterization of involved reservoirs, then establishes a geological concept model and makes clear reservoir type, geometric boundary, reserves and aquifer energy of the fracture-vug unit. Dynamic and static data are used by multidisciplinary means to describe the fracture-vug unit, and reasonable recommendations are proposed on well testing for these reservoirs. A comprehensive evaluation on the fracture-vug combination model and dominant reservoir type is made based upon the flow experiments of a large-scale physical model in combination with production performance and well testing data. Based on this, the fracture-vug units in an individual well are divided using dynamic production characterization. Finally, the fracture-vug units for Ying Mai-2 Block are divided by seismic prediction and gridding judgment taking the units with well data as the standard, and thus a powerful guidance for the reservoir development at present stage is provided.
PubDate: 2018-05-01
DOI: 10.1007/s13369-017-2976-2
Issue No: Vol. 43, No. 5 (2018)

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