An Evaluation of Microbial Flooding for Enhanced Oil Recovery, Fuyu Oilfield, China

2017 ◽  
Author(s):  
Wang Jinfang ◽  
Wang Zhengmao ◽  
Tian Jun ◽  
Shi Chengfang ◽  
Gao Jian
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Microbial Flooding

scholarly journals Experimental study of microbial enhanced oil recovery in oil-wet fractured porous media

2020 ◽  
Vol 75 ◽  
pp. 73
Author(s):  
Amin Abolhasanzadeh ◽  
Ali Reza Khaz’ali ◽  
Rohallah Hashemi ◽  
Mohammadhadi Jazini
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Low Cost ◽  
Fractured Reservoirs ◽  
Gas Production ◽  
Wettability Alteration ◽  
Oil Viscosity ◽  
Sweep Efficiency ◽  
The Matrix ◽  
Microbial Flooding

Without Enhanced Oil Recovery (EOR) operations, the final recovery factor of most hydrocarbon reservoirs would be limited. However, EOR can be an expensive task, especially for methods involving gas injection. On the other hand, aqueous injection in fractured reservoirs with small oil-wet or mixed-wet matrices will not be beneficial if the rock wettability is not changed effectively. In the current research, an unpracticed fabrication method was implemented to build natively oil-wet, fractured micromodels. Then, the efficiency of microbial flooding in the micromodels, as a low-cost EOR method, is investigated using a new-found bacteria, Bacillus persicus. Bacillus persicus improves the sweep efficiency via reduction of water/oil IFT and oil viscosity, in-situ gas production, and wettability alteration mechanisms. In our experiments, the microbial flooding technique extracted 65% of matrix oil, while no oil was produced from the matrix system by water or surfactant flooding.

scholarly journals Isolating, identifying and evaluating of oil degradation strains for the air-assisted microbial enhanced oil recovery process

PLoS ONE ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. e0243976
Author(s):  
Mingming Cheng ◽  
Long Yu ◽  
Jianbo Gao ◽  
Guanglun Lei ◽  
Zaiwang Zhang
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Enhanced Oil Recovery ◽  
Oxygen Concentration ◽  
Oil Recovery ◽  
Microbial Growth ◽  
Water Flooding ◽  
Oil Degradation ◽  
Microbial Enhanced Oil Recovery ◽  
Microbial Flooding

Due to the inefficient reproduction of microorganisms in oxygen-deprived environments of the reservoir, the applications of microbial enhanced oil recovery (MEOR) are restricted. To overcome this problem, a new type of air-assisted MEOR process was investigated. Three compounding oil degradation strains were screened using biochemical experiments. Their performances in bacterial suspensions with different amounts of dissolved oxygen were evaluated. Water flooding, microbial flooding and air-assisted microbial flooding core flow experiments were carried out. Carbon distribution curve of biodegraded oil with different oxygen concentration was determined by chromatographic analysis. The long-chain alkanes are degraded by microorganisms. A simulation model was established to take into account the change in oxygen concentration in the reservoir. The results showed that the optimal dissolved oxygen concentration for microbial growth was 4.5~5.5mg/L. The main oxygen consumption in the reservoir happened in the stationary and declining phases of the microbial growth systems. In order to reduce the oxygen concentration to a safe level, the minimum radius of oxygen consumption was found to be about 145m. These results demonstrate that the air-assisted MEOR process can overcome the shortcomings of traditional microbial flooding techniques. The findings of this study can help for better understanding of microbial enhanced oil recovery and improving the efficiency of microbial oil displacement.

scholarly journals Recent Advance of Microbial Enhanced Oil Recovery (MEOR) in China

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Haicheng She ◽  
Debin Kong ◽  
Yiqiang Li ◽  
Zaiqiang Hu ◽  
Hu Guo
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Molecular Level ◽  
Field Tests ◽  
Commercial Application ◽  
Fluid Temperature ◽  
High Resolution Mass Spectrum ◽  
Microbial Enhanced Oil Recovery ◽  
Indigenous Microorganism ◽  
Microbial Flooding

Compared with other enhanced oil recovery (EOR) techniques like gas flooding, chemical flooding, and thermal production, the prominent advantages of microbial enhanced oil recovery (MEOR) include environment-friendliness and lowest cost. Recent progress of MEOR in laboratory studies and microbial flooding recovery (MFR) field tests in China are reviewed. High biotechnology is being used to investigate MFR mechanisms on the molecular level. Emulsification and wettability alternation due to microbial effects are the main interests at present. Application of a high-resolution mass spectrum (HRMS) on MEOR mechanism has revealed the change of polar compound structures before and after oil degradation by the microbial on the molecular level. MEOR could be divided into indigenous microorganism and exogenous microorganism flooding. The key of exogenous microorganism flooding was to develop effective production strains, and difficulty lies in the compatibility of the microorganism, performance degradation, and high cost. Indigenous microorganism flooding has good adaptation but no follow-up process on production strain development; thus, it represents the main development direction of MEOR in China. More than 4600 wells have been conducted for MEOR field tests in China, and about 500 wells are involved in MFR. 47 MFR field tests have been carried out in China, and 12 field tests are conducted in Daqing Oilfield. MFR field test’s incremental oil recovery is as high as 4.95% OOIP, with a typical slug size less than 0.1 PV. The input-output ratio can be 1 : 6. All field tests have shown positive results in oil production increase and water cut reduction. MEOR screening criteria for reservoirs in China need to be improved. Reservoir fluid, temperature, and salinity were the most important three parameters. Microbial flooding technology is mature in reservoirs with temperature lower than 80°C, salinity less than 100,000 ppm, and permeability above 5 mD. MFR in China is very close to commercial application, while MFR as quaternary recovery like those in post-polymer flooding reservoirs needs further study.

Analysis on Microbial Community Structure and Phylogenetics for the Reservoir System after the Microbial Enhanced Oil Recovery

2011 ◽  
Vol 361-363 ◽  
pp. 393-399
Author(s):  
Yong Hong Huang ◽  
Hai Yan Ding ◽  
Zhao Wei Hou ◽  
Guo Ling Ren ◽  
Xiao Lin Wu ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Microbial Community Structure ◽  
Polymer Flooding ◽  
Microbial Enhanced Oil Recovery ◽  
Reservoir System ◽  
Directional Control ◽  
Microbial Flooding

In order to probe a new enhanced oil recovery technology during the post polymer flooding process, we constructed the 16SrDNA gene library and analysed PCR-DGGE during the post-microbial enhanced oil recovery of polymer flooding process. Through the research for the reservoir system, we studied the microbial community structure and genetic diversity after polymer flooding process, made the phylogenetic analysis. It is supposed to provide a dependable basis for MEOR through directional control microbial community of reservoir, through development and application of effective microbial flooding technology.

An Evaluation of Microbial Flooding for Enhanced Oil Recovery, Fuyu Oilfield, China (Russian)

2017 ◽  
Author(s):  
Wang Jinfang ◽  
Wang Zhengmao ◽  
Tian Jun ◽  
Shi Chengfang ◽  
Gao Jian
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Microbial Flooding

Numerical Investigation on Low Salinity Augmented Microbial Flooding LSAMF within a Sandstone Core for Enhanced Oil Recovery Under Nonisothermal and Fluctuating pH Conditions

2021 ◽  
Author(s):  
Susmit Chakraborty ◽  
Suresh Kumar Govindarajan ◽  
Sathyanarayana N. Gummadi
Keyword(s):  
Crude Oil ◽  
Enhanced Oil Recovery ◽  
Relative Permeability ◽  
Oil Recovery ◽  
Present Model ◽  
Transport Model ◽  
Water Salinity ◽  
Fractional Flow ◽  
Low Salinity ◽  
Microbial Flooding

Summary In an era of increasing energy demand, declining oil fields and fluctuating crude oil prices globally, most oil companies are looking forward to implementing cost effective and environmentally sustainable enhanced oil recovery (EOR) techniques such as low salinity waterflooding (LSWF) and microbial EOR (MEOR). The present study numerically investigates the combined influence of simultaneous LSWF and microbial flooding for in-Situ MEOR in tertiary mode within a sandstone core under spatiotemporally fluctuating pH and temperature conditions. The developed black oil model consists of five major coupled submodels: nonlinear heat transport model; ion transport coupled with multiple ion exchange (MIE) involving uncomplexed cations and anions; pH variation with salinity and temperature; coupled reactive transport of injected substrates, Pseudomonas putida and produced biosurfactants with microbial maximum specific growth rate varying with temperature, salinity and pH; relative permeability and fractional flow curve variations due to interfacial tension reduction and wettability alteration (WA) by LSWF and biofilm deposition. The governing equations are solved using finite difference technique. Operator splitting and bisection methods are adopted to solve the MIE-transport model. The present model is found to be numerically stable and agree well with previously published experimental and analytical results. In the proposed MIE-transport mechanism, decreasing injection water salinity (IWS) from 2.52 to 0.32 M causes enhanced Ca2+ desorption rendering rock surface towards more water wet. Consequently, oil relative permeability (kro) increases with >55% reduction in water fractional flow (fw) at water saturation of 0.5 from the initial oil-wet condition. Further reducing IWS to 0.03 M causes Ca2+ adsorption shifting the surface wettability towards more oil-wet thus increasing fw by 52%. Formation water salinity (FWS) showed minor impact on WA with <5% decrease in fw when FWS is reduced from 3.15 to 1.05 M. During LSAMF, biosurfactant production is enhanced by >63% on reducing IWS from 2.52 to 0.32 M with negligible increase on further reducing IWS and FWS. This might be due to limiting nonisothermal (40 to 55 °C) and nutrient availability conditions. LSAMF caused significant WA, increase in kro with fw reduction by >84%. Though pH increased from 8.0 to 8.9, it showed minor impact on microbial metabolism. Formation damage due to bioplugging observed near injection point is compensated by effective migration of biosurfactants deep within sandstone core. The present study is a novel attempt to show synergistic effect of LSAMF over LSWF in enhancing oil mobility and recovery at core scale by simultaneously addressing complex crude oil-rock-brine chemistry and critical thermodynamic parameters that govern MEOR efficiency within a typical sandstone formation. The present model with relatively lower computational cost and running time improves the predictive capability to pre-select potential field candidates for successful LSAMF implementation.

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