Papers by Keyword: Heavy Oil

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Authors: Wei Zhang, Zhi Ping Li, Yu Wang
Abstract: The steam flooding is one common way used to enhance oil recovery of heavy oil reservoir. It is difficult to use conventional treatment on steam flooding analysis because of numerous effective factors, complex relationships and no certain mapping relation among those factors. This paper applies grey relationship method to analyze correlative degree of the factors which effect on steam flooding, and then selects steam absorption effect as the comparative indicator, finally gets a sort of steam flooding effect of different parameters. Each correlation degree has a good match with steam flooding effect, and the higher of correlation degree the better of steam flooding effect. Grey relationship is an effective, fast and accurate method for appraising steam flooding effect.
Authors: Yu Chuan Cai, Yong Jian Liu, Xiang Fang Li, Yan Zun Li, Xiao Lin Zhang, Xiang Nan He, Qiong Cheng
Abstract: Nowadays most heavy oil reservoirs are developed by thermal recovery methods, such as steam huff - puff and steam flooding. At the late stage of heavy oil steam drive, because of steam overlap in the upper reservoir formation, steam channeling can easily occur in production well. The research has shown that development effect of steam - nitrogen compound drive is not as good as consideration after steam channeling. But by injecting water slug can decrease the effect of steam channeling. For increasing water phase saturation in high permeability channel, steam and nitrogen gas relative permeability will decrease. As result, it will enlarge the reservoir vertical producing degree, and at the same time take full advantage of the oil displacement effect of steam - nitrogen compound drive. Through the numerical simulation, the study found that, steam - water - nitrogen compound drive technology can achieve better recovery degree using high hot water temperature and shorter injection time.
Authors: Yun Xiao Ding
Abstract: In this paper we develop an adaptive mesh refinement (AMR) algorithm for solving the non-isothermal three-phase flows in heterogeneous porous media such as steam flooding in heavy oil reservoir. This porous media are made up of different rock types. The refinement criteria are proposed to overcome the difficulty that the saturation is discontinuous across the interface of two different rock types. Since the ratios of relative permeability between different rock types are found to be continuous, they are chosen as the control parameters to perform the refining and coarsening operations. The numerical examples show that the proposed AMR algorithm is fast with good accuracy.
Authors: Fa Jun Zhao, Yong Jian Liu, Bo Zhang, Si Ha, Shi Ping Li
Abstract: Under the simulated thermal recovery condition, fundamental experiments were carried out in the high temperature high pressure reactor to study the aquathermolysis reaction of heavy oil using formic acid as hydrogen donor and oil-soluble organic home-made nickel salt as catalytic. Urea was selected optimally from the alternative chemical addictivess of ammonium carbonate, urea and ammonium hydrocarbonate and its dosage was 20wt%. The affect of the adding addictives in water for viscosity, group composition and element content of heavy oil during the hydrogen donor catalytic pyrolysis reaction, was researched. It was revealed that there mechanism in the heavy oil viscosity reduction reaction process. The addition of addictives had not only some degree of viscosity reduction function, but also synergistic interaction to the catalyzed reaction with hydrogen donor. Compared to the oil sample from reaction without addictives, there was no obvious change on group compositions, the contents of atom C, H, S, N and O nearly kept unchanged. the introduction of addictives basically did not change structure of heavy oil.
Authors: Hee Jun Lim, Sung Mi Yun, Kim Gillan, Han Seung Kim
Abstract: Recently, reconstruction of abandoned railroad stations and railroad beds are increasingly taking place in Korea. Soil remediation is necessary for the eco-friendly development. Soil found in abandoned railroad sites typically contaminated with heavy oils, which are low volatile petroleum products and less decomposable in nature. The objective of this study is to analyze those contaminants and contamination levels of the soils collected from an abandoned railroad bed located in Seoul, Korea. Heavy oils were extracted from contaminated soils using an organic solvent mixture of methanol and dichloromethane (1:2, v/v). Extracted solvent were analyzed qualitatively by Fourier transform infrared spectroscopy (FT-IR) and qualitatively using high performance liquid chromatography. It was found that the abandoned railroad bed soil was mainly contaminated by heavy oils such as bunker C oil, which was confirmed by FT-IR spectra of petroleum oil products such as gasoline, diesel, kerosene, JP-8, bunker C oil, and lubricants. Benzo [a] antracene was found from the contaminated soil and its level was as high as 11.45 mg/kg, and other polycyclic aromatic hydrocarbons were trivial.
Authors: Yun Long Cheng
Abstract: SAGD dynamic temperature and pressure monitoring technology can be used to detect multi-point temperature and pressure in production well, determine liquid state, accurately identify the movement direction of steam and breakthrough position so that it can effectively guide SAGD production and reduce operation costs, thereby significantly improve heavy oil recovery.
Authors: Yan Dong, An Zhu Xu
Abstract: The fluid flowing resistance increase and the water absorbing capacity reduce due to the threshold pressure gradient and media deformation of the low permeability reservoirs in the course of development. The oil production of vertical wells may decrease fastly and the controlled reservers are hard to recover. The development effects are not satisfied. Through great fracturing measurements create many fractures, and fractures extended along the direction of well line, the long fracture channels were formed like horizontal well segments. This kind of long fracture was called as horizontal segment of imitation horizontal well. It can broad drainage radius in production well and increase controlled reserves and daily oil production of single well. In this paper, the influence factors of the low permeablity reservoirs development by imitation horizontal wells were analysised. Through well pattern, well distance, line distance, injector and producer parameters and fracturing parameters of imitation horizontal well optimization, drainage radius in lower permeability reservoirs can be reached to 200 meters, the daily production in single well can increase two times of that before, and the production result was improved greatly in lower permeability reservoirs development.
Authors: Yi Ding, Guo Wei Qin, Peng Liu, Zi Li Fan, Hong Wei Xiao, Yan Ming Bai, Lei Wang, Wen Bo Xu
Abstract: Heat self-generated CO2 technique is proposed, which is focused on the problems of recovery difficulty, poor effect steam soaking and so on for heavy oil reservoirs. This technology is combining of steam flooding and gas flooding and so on. Its main mechanism is the application of steam heating blowing agent to generate a large volume of gases (including CO2, NH3, etc) in the formation. While some of these gases acting with the oil to reduce the oil viscosity, some form miscible flooding to reduce water interfacial tension, so as to achieve the purpose of enhancing oil recovery. An optimized selection of the heat blowing agents was performed. By comparison the difference before and after the reaction of blowing agent solution, the increase of alkaline is occurred after the reaction, and is helpful to reduce oil viscosity and lower interfacial tension, etc. Studies indicate that heat-generating CO2 flooding technology can get a maximum viscosity reduction rate of 76.7%, oil-water interfacial tension decreased by 54.77%, further improve oil recovery by 4.17% based on the steam drive, which shows a technical advantage toward conventional EOR method. The field experiments indicate that the technique can greatly improve the oil production, which will provide a powerful technical supporting for the efficient development of heavy oil.
Authors: Zhong Jun Fu, Feng Song, Lu Shan Yu, Run Sun
Abstract: In this paper, the current hazardous waste disposal methods of heavy organic matter were reviewed and the craft process of molecular distillation technology on distillation residue, recycling and reduction of heavy and dangerous waste organic matter were analyzed. The yield and the influence on product viscosity of molecular distillation separation heavy resid under different technology conditions were studied and the results showed that the technology conditions of molecular distillation separation heavy resid is residual pressure 10 pa, temperature 250 oC, blown film machine speed 230 r/min. the properties of the oil distillated met the national standard of wax oil. The goals of using molecular distillation recycling waste organic matter and heavy resource waste reduction were achieved.
Authors: Xin Wang, Dan Su, Hai Bo Li
Abstract: Nine fungal strains, previously isolated from produced wastewater in Liaohe oilfield in China, were screened for the study on the biodegradation ability of heavy oil in a batch of shake-flask culture. Among them, fungi F1, F4, F5 and F7 showed relatively higher abilities for the biodegradation of heavy oil. Heavy oil removal rates after 56 days by the above four strains were 57.82 %, 63.30 %, 36.46 % and 45.63 %, respectively. In addition, the biodegradation process followed the first- order kinetics, and the half- life of heavy oil from long to short order was F5>F7>F1>F4. By contrast, fungus F4 was the highest effective strain for heavy oil degradation. Degradation rates of petroleum fractions by different fungal strains varied significantly. And the highest degradation rates of alkanes was 42.99 % by F5, and correspondingly, that of aromatics with 37.87 % by F1, and that of colloids and asphaltenes with 46.42 % by F4.
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