scholarly journals Study on frequency optimization and mechanism of ultrasonic waves assisting water flooding in low-permeability reservoirs

2021 ◽  
Vol 70 ◽  
pp. 105291
Author(s):  
Xu Li ◽  
Chunsheng Pu ◽  
Xin Chen ◽  
Feifei Huang ◽  
Heng Zheng
Keyword(s):  
Ultrasonic Waves ◽  
Water Flooding ◽  
Low Permeability ◽  
Frequency Optimization ◽  
Low Permeability Reservoirs

The Research of Layer System Subdivision and Adjustment Methods in YSL Block of the Low Permeability Reservoirs

2013 ◽  
Vol 274 ◽  
pp. 153-156
Author(s):  
Rong Hua Li ◽  
Jun Ting Zhang ◽  
Cheng Lin Zhang ◽  
Huan Huan Zhang ◽  
Peng Qu
Keyword(s):  
Water Injection ◽  
Oil Field ◽  
Thin Layers ◽  
Water Flooding ◽  
Low Permeability ◽  
Layer System ◽  
Oil Distribution ◽  
Major Adjustment ◽  
Low Permeability Reservoirs ◽  
Oilfield Development

Layer system subdivision and adjustment is applied in oilfield development to ease the contradiction in inner-layer and interlayer and implement separated layer water flooding well, which is a major adjustment measure to improve developing effects. YSL is a typical low-permeability oil field, whose petrophysics is poor, and which exist many problems, such as apparent contradictions between layers, and poor development effects through separated zone water injection and so on. In this article, the thickness of barriers, injection profile, permeability contrast and remaining oil distribution are analyzed comprehensively. So a reasonable method is also proposed. Much weakness that factors are not comprehensive in adjustment method and that the problems in the development process are not accurately reflected is overcome, which exists in the past methods. The adjustment means can utilize poor thin layers better, reduce invalid water injection and ease the contradictions between layer, and oilfield development effects are improved eventually. It is a reference and guidance for other blocks or oilfield which exist the same problems.

scholarly journals Study on Distribution Characteristics and Displacement Mechanism of Microscopic Residual Oil in Heterogeneous Low Permeability Reservoirs

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Yujia Fang ◽  
Erlong Yang ◽  
Xiaona Cui
Keyword(s):  
Oil Recovery ◽  
Water Flooding ◽  
Polymeric Surfactant ◽  
Low Permeability ◽  
Distribution Characteristics ◽  
Residual Oil ◽  
Surfactant Flooding ◽  
Permeability Ratio ◽  
Displacement Mechanism ◽  
Low Permeability Reservoirs

In order to explore the development methods suitable for heterogeneous low permeability reservoirs and study the distribution characteristics of residual oil, photoetched glass and artificial core models with three permeability ratios of 1, 6, and 9 were prepared in this research. Three displacement schemes including polymeric surfactant flooding, polymeric surfactant with binary flooding, and binary flooding were designed at the same expenses to obtain the displacement mechanism of various residual oil saturations. The results show that the best displacement efficiency can be achieved by polymeric surfactant flooding, followed by polymeric surfactant with binary flooding, and binary flooding for the models with the same permeability ratio. Binary flooding mainly activates cluster and oil drop residual oils, polymeric surfactant with binary flooding mainly activates cluster, oil film, and column residual oils, whereas polymeric surfactant flooding mainly activates cluster, oil drop, and column residual oils. In addition, with the increase of the model permeability ratio, the recovery ratio of water flooding decreases, whereas the enhanced oil recovery and the variations in residual oil saturation gradually increase after carrying out different displacement measures. The viscoelastic and shearing effects of the polymeric surfactant flooding system can better displace the residual oil, assisting in the further development of heterogeneous low permeability reservoirs.

Timing of advanced water flooding in low permeability reservoirs

2009 ◽  
Vol 19 (1) ◽  
pp. 124-128
Author(s):  
Xiao-qing XIE ◽  
Han-qiao JIANG ◽  
Min-feng CHEN ◽  
Tong-jing LIU ◽  
Wei ZHANG
Keyword(s):  
Water Flooding ◽  
Low Permeability ◽  
Low Permeability Reservoirs

Dynamic Capillarity During the Water Flooding Process in Fractured Low Permeability Reservoirs

2019 ◽  
Author(s):  
Ying Li ◽  
Haitao Li ◽  
Shengnan Chen ◽  
Yu Lu ◽  
Xiaoying Li ◽  
...  
Keyword(s):  
Water Flooding ◽  
Low Permeability ◽  
Low Permeability Reservoirs ◽  
Dynamic Capillarity

The Research of Layer System Adjustment Methods in DQY103 Block of the Low Permeability Reservoirs

2012 ◽  
Vol 594-597 ◽  
pp. 2616-2619
Author(s):  
Tie Jun Yang ◽  
Chun Lin Liu ◽  
Chun Quan Fu ◽  
Jun Ting Zhang ◽  
Hong Jun Yin
Keyword(s):  
Water Injection ◽  
Physical Property ◽  
Thin Layers ◽  
Water Flooding ◽  
Low Permeability ◽  
Layer System ◽  
Apparent Contradiction ◽  
Oil Distribution ◽  
Major Adjustment ◽  
Low Permeability Reservoirs

In order to ease the contradiction between layers, layer system adjustment is applied in oilfield development and separated layer water flooding is realized better. This method is a major adjustment measure to improve development effects. DQY103 is a typical low-permeability oilfield and physical property is poor. Many problems are existed, such as apparent contradiction between layers, and poor development effects and so on. In this article, the physical property and thickness of barrier, injection profile, permeability contrast and remaining oil distribution are analyzed comprehensively. A reasonable method is also proposed. Much weakness which exists in the former methods is overcome. For example, factors are not comprehensive and accurately reflected. Poor thin layers are produced better. Invalid water injection and contradiction between layers are decreased. Development effects are improved eventually. It is a reference and guidance for other blocks which exists the same problem.

Analysis of the channeling of water injection in low permeability reservoirs with interlayer considering the seepage–stress coupling

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ji Youjun ◽  
K. Vafai ◽  
Huijin Xu ◽  
Liu Jianjun
Keyword(s):  
Water Injection ◽  
Simulation Method ◽  
Stress Sensitivity ◽  
Injection Rate ◽  
Water Flooding ◽  
Low Permeability ◽  
Content Type ◽  
Main Injection ◽  
Low Permeability Reservoirs ◽  
The Impact

Purpose This paper aims to establish a mathematical model for water-flooding considering the impact of fluid–solid coupling to describe the process of development for a low-permeability reservoir. The numerical simulation method was used to analyze the process of injected water channeling into the interlayer. Design/methodology/approach Some typical cores including the sandstone and the mudstone were selected to test the permeability and the stress sensitivity, and some curves of the permeability varying with the stress for the cores were obtained to demonstrate the sensitivity of the formation. Based on the experimental results and the software Eclipse and Abaqus, the main injection parameters to reduce the amount of the injected water in flowing into the interlayer were simulated. Findings The results indicate that the permeability of the mudstone is more sensitive to the stress than sandstone. The injection rate can be as high as possible on the condition that no crack is activated or a new fracture is created in the development. For the B82 block of Daqing oilfield, the suggested pressure of the production pressure should be around 1–3MPa, this pressure must be gradually reached to get a higher efficiency of water injection and avoid damaging the casing. Originality/value This work is beneficial to ensure stable production and provide technical support to the production of low permeability reservoirs containing an interlayer.

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