Modulated amplitude waves with nonzero phases in Bose-Einstein condensates

Liu, Qihuai; Qian, Dianwei

doi:10.1063/1.3623415

Cited by 15 publications

(9 citation statements)

References 49 publications

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“…Since the reservoir permeability bound given by CNPC and Sinopec is 50 mD, whether ultra-lowpermeabilityreservoirs are suitable to use MOER draws attention. A pilot in an ultra-low-permeability reservoir was conducted in 2009 in Ansai in Changqing Oilfield [31,[66][67][68]. The average permeability of Ansai Oilfield is 1.29 mD, and the average porosity is 12.4%.…”

Section: Changqing Oilfieldmentioning

confidence: 99%

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

She

Kong

et al. 2019

Geofluids

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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.

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Section: Changqing Oilfieldmentioning

confidence: 99%

“…The well pattern is shown in Figure 15 [31,68]. Oil production before and after MRF is given in Table 7 [31,68] while reservoir parameters are given in Table 8 [31,[66][67][68]. Oil production indicates that microbial flooding can reduce water cut and increase oil production.…”

Section: Changqing Oilfieldmentioning

confidence: 99%

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

She

Kong

et al. 2019

Geofluids

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“…However, also in many cases, weak potentials or approximately constant potentials are typically used, such as ( ) = 0 + 1 ( ) with ≪ 1. Therefore, one can use the Lindstedts method and the multiple scale perturbation theory [13,14] or the method of averaging [15][16][17] to study dynamics of BEC with the high order approximation. For = 0, the solutions of system (1) with coherent structures may be equilibrium points, standing waves, solitary waves, or even unbounded.…”

Section: Introductionmentioning

confidence: 99%

“…For = 0, the solutions of system (1) with coherent structures may be equilibrium points, standing waves, solitary waves, or even unbounded. While the small perturbed parameter ̸ = 0, for example, Bose-Einstein condensed atoms being perturbed by a weak optical lattice potential, the dynamical characters of these solutions may be preserved [14,15] as periodic or quasiperiodic modulated amplitude waves. However, under some conditions of the adjustable parameters such characters may be destroyed, and the spatial chaos in the BEC occurs [6].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Bose-Einstein Condensates: Exact Representation and Topological Classification of Coherent Matter Waves

Jia

Liu

Tang

2014

Abstract and Applied Analysis

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By using the bifurcation theory of dynamical systems, we present the exact representation and topological classification of coherent matter waves in Bose-Einstein condensates (BECs), such as solitary waves and modulate amplitude waves (MAWs). The existence and multiplicity of such waves are determined by the parameter regions selected. The results show that the characteristic of coherent matter waves can be determined by the “angular momentum” in attractive BECs while for repulsive BECs; the waves of the coherent form are all MAWs. All exact explicit parametric representations of the above waves are exhibited and numerical simulations support the result.

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“…For instance, the existence of periodic orbits and the stability of system have been studied using averaging method in [22][23][24][25][26]. In the previous work [27], we have studied the existence of periodic orbits and their stability by using the classical averaging method for the three-particle timedependent FPU chains, where the system can be regarded as a perturbation of isochronous system.…”

Section: Introductionmentioning

confidence: 99%

On the Periodic Orbits of Four-Particle Time-Dependent FPU Chains

Tang

Xing

Liu

et al. 2018

Advances in Mathematical Physics

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We study the existence of the periodic orbits for four-particle time-dependent FPU chains. To begin with, taking an orthogonal transformation and dropping two variables, we put the system into a lower dimensional system. In this case, the unperturbed system has the linear spectra 2 and √ 2, which are rational independent. Therefore, the classical averaging theory cannot be applied directly, and the existence and multiplicity of periodic orbits for four-particle FPU chains is proved by using a new result from averaging theory by Buicȃ, Francoise, and Llibre.

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Modulated amplitude waves with nonzero phases in Bose-Einstein condensates

Cited by 15 publications

References 49 publications

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

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

Dynamics of Bose-Einstein Condensates: Exact Representation and Topological Classification of Coherent Matter Waves

On the Periodic Orbits of Four-Particle Time-Dependent FPU Chains

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