Papers by Keyword: Oil Recovery

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Authors: Nur Hashimah Alias, Mohd Sabri Zulkifli, Shareena Fairuz Abdul Manaf, Effah Yahya, Nurul Aimi Ghazali, Tengku Amran Tengku Mohd
Abstract: This article is an overview of microbial enhanced oil recovery (MEOR) and the potential of Saccharomyces Cerevisiae to be applied in MEOR. MEOR may have same mechanisms with commercial enhanced oil recovery (EOR) but it used biological approach in improving oil recovery. Saccharomyces Cerevisiae produced carbon dioxide and ethanol under anaerobic condition. The carbon dioxide and ethanol that produced by this microbe are two from the six main MEOR agents in improving oil recovery. This articles also discussed on previous MEOR pilot projects that were conducted in Argentina, China and Malaysia.
Authors: Jing Jie Yao, Zhi Ping Li, Yang Chen
Abstract: Carbon dioxide miscible flooding in oil reservoirs is a general method of enhancing oil recovery, nevertheless, not all reservoirs adapt to this method. Therefore, evaluating the adaptability of carbon dioxide flooding reservoirs becomes an important problem which is urged to be solved. Through the research of carbon dioxide flooding situation and displacement mechanism, twelve factors which influenced the oil displacement effect could be obtained. Compared factors with oil recovery by means of the advanced analysis of SPSS, and chose ten factors to be the evaluating indices which could apply in cluster analysis. Through building mathematical model and clustering reservoirs, the adaptability of carbon dioxide flooding could be evaluated comprehensively. Apply this method to cluster nine typical reservoirs which have adopted carbon dioxide flooding, the results show that, this method can evaluate the adaptability of carbon dioxide flooding reservoirs, which is corresponding to the real exploitation effect.
Authors: Shao Zhu Liu, Wei Li Liu, Zhi Gang Liu, Jing Chang Li, Xiao Chun Zhang, Yu Yan Liu, Yong Zhen Wang
Abstract: A simple sugar-derived supramolecular gelator of 1,6-dicaprylate sorbitan ester was designed and prepared as new oil solidifier. The gelation tests revealed that the gelator can gel or phase-selectively gel fuel oils, edible oils and some organic solvents. And the SEM images showed the structure of 3D fiber network was formed in the process of gelation. What’s more, the rate of oil removal in water was 85% and the recovery rate of spilled oils reached up to 60.29%.
Authors: Fu Qing Yuan, Zhen Quan Li
Abstract: According to the geological parameters of Shengli Oilfield, sweep efficiency of chemical flooding was analyzed according to injection volume, injection-production parameters of polymer flooding or surfactant-polymer compound flooding. The orthogonal design method was employed to select the important factors influencing on expanding sweep efficiency by chemical flooding. Numerical simulation method was utilized to analyze oil recovery and sweep efficiency of different flooding methods, such as water flooding, polymer flooding and surfactant-polymer compound flooding. Finally, two easy calculation models were established to calculate the expanding degree of sweep efficiency by polymer flooding or SP compound flooding than water flooding. The models were presented as the relationships between geological parameters, such as effective thickness, oil viscosity, porosity and permeability, and fluid parameters, such as polymer-solution viscosity and oil-water interfacial tension. The precision of the two models was high enough to predict sweep efficiency of polymer flooding or SP compound flooding.
Authors: You Yi Zhu, Yi Zhang, Qing Feng Hou, Hua Long Liu, Guo Qing Jian
Abstract: The oil and water (O/W) interfacial tension affecting on oil recovery of surfactant-polymer (SP) flooding was studied based on Berea core flooding tests. The results of SP flooding physics simulation tests showed that when the O/W interfacial tension decreased, the incremental oil recovery of SP flooding increased accordingly, when the O/W interfacial tension decrease to 5×10-3mN/m level, near the highest oil recovery of SP flooding can be obtained. The SP flooding system with low interfacial tension can obtain 7-15% incremental oil recovery more than that with high IFT system.
Authors: Zi Yuan Qi, Ye Fei Wang, Xiao Li Xu
Abstract: Surfactant imbibition experiments were carried out with four surfactants and effects of interfacial tension and surface wettability on oil recovery were studied. A convenient imbibition process with quartz sands was used, and the experimental results suggest that anionic and non-ionic surfactants have higher oil recovery than cationic surfactant, and the sand surface wettability plays an important role in influencing oil recovery during spontaneous imbibition. Altering the wettability of oil sand surface from oil-wet to water-wet can enhance the oil recovery of imbibition process. The maximum ultimate imbibition recovery appeared in the area where both contact angle and interfacial tension were low.
Authors: Chun Juan Han
Abstract: The thermoplastic composite material is glass fiber, carbon fiber, aromatic fiber and other materials to enhance various thermoplastic resins abroad collectively, known as a FRTP. Enhanced Oil Recovery (EOR) techniques helps to recover residue oil after Primary and secondary recovery of reservoir. This paper deals with a new Carbon Di Oxide (CO2) EOR technique, “HOT CO2” which includes combination of thermal and solvent techniques where miscibility and viscosity reduction are primary concern. In the proposed method CO2 will be superheated above the reservoir temperature to reduce the oil viscosities at the same time partially mix with crude oil which improves oil mobility. “HOT CO2 flooding” will going to be one the best option for EOR in future.
Authors: Wongsarivej Pratarn, Srirahong Kanawut, Sawasdisevi Thanit
Abstract: Even though the hydrocyclone can be well used for de-oiling, the major problem with normal hydrocyclones is that they discharge relatively large amounts of oil with the water through the underflow. Therefore, the suitable hydrocyclone proportion and optimum hydrocyclone operating conditions should be investigated carefully to achieve better separation efficiency. In this research, a 35 mm hydrocyclone was studied for separating 25% of oil and 75% of water. The objective of the present manuscript was to investigate the important parameter and operating conditions that affected the oil recovery in the overflow. The investigated factors were inlet diameter, inlet velocity and flow ratio. From the experimental results obtained it could be concluded that 1) a decrease in inlet diameter led to an increase in the oil recovery in the overflow; 2) an increase in inlet velocity led to an increase in the oil recovery in overflow. In fact, the inlet velocity that provided the best oil recovery in this research was 8 m/s; 3) an increase in the flow ratio led to an increase in the oil recovery in the overflow.
Authors: Hao Chen, Sheng Lai Yang, Fang Fang Li, San Bo Lv, Zhi Lin Wang
Abstract: CO2 flooding process has been a proven valuable tertiary enhanced oil recovery (EOR) technique. In this paper, experiment on extractive capacity of CO2 in oil saturated porous media was conducted under reservoir conditions. The main objectives of the study are to evaluate extractive capacity of CO2 in oil saturated natural cores and improve understanding of the CO2 flooding mechanisms, especially in porous media conditions. Experimental results indicated that oil production decreases while GOR increases with extractive time increases. the changes of the color and state of the production oil shows that oil component changes from light to heavy as extractive time increases. In addition, no oil was produced by water flooding after extractive experiment. Based on the experimental results and phenomena, the main conclusion drawn from this study is that under supercritical condition, CO2 has very powerful extractive capacity. And the application of CO2 flooding is recommended for enhancing oil recovery.
Authors: Noorhana Yahya, Muhammad Kashif, Afza Shafie, Hasan Soleimani, Hasnah Mohd Zaid, Noor Rasyada Ahmad Latiff
Abstract: Oil recovery in offshore environments can be increased by using nanofluids with electromagnetic waves generated from an antenna in the oil reservoir. In the case of offshore environments, these constraints can be avoided if a horizontal antenna is towed close to the seabed, which maximises the electromagnetic energy transferred from the overburden to the reservoir and nanofluids in the reservoir. In this research, a new enhanced antenna is used with iron oxide (Fe2O3) and zinc oxide (ZnO) nanofluids for oil recovery applications at the laboratory scale. In the antenna study, it was observed that the curve antenna with magnetic feeders gave a 1978% increase in the magnetic field signal strength compared to the case without magnetic feeders. The curve antenna with magnetic feeders produced a 473% increase in the electric field signal strength compared to the case without magnetic feeders. Iron oxide (Fe2O3) nanoparticles were prepared by the sol-gel method. The iron oxide (Fe2O3) nanoparticle sizes were in the range of 30.27-37.60 nm. FESEM and HRTEM images show that the samples have good crystallinity and that the grain size increased as temperature increased. Iron oxide (Fe2O3) samples sintered at 500°C showed a high initial permeability and Q-factor and a low loss factor compared to samples sintered at 500°C. The sample had a very high initial permeability and a low loss at low frequencies; therefore, it was suitable for the preparation of the nanofluid and oil recovery applications. Oil recovery through the usage of 0.1 % (w/w) iron oxide (Fe2O3) nanofluid with an EM field generated from the curve antenna with magnetic feeders was 33.45% of OOIP (original oil in place). In a similar case where 0.1 % (w/w) zinc oxide (ZnO) nanofluid with an EM field was used, 22.46 % of OOIP was recovered. These results imply that injecting 0.1% w/w iron oxide nanofluid coupled to the curve antenna with magnetic feeders has potential for oil recovery for improved water flooding systems because the high magnetic flux density that acts on the nanoparticles is proportional to the magnetic field strength.
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