Dynamic fractures are an emerging new development geological attribute in water-flooding development of ultra-low permeability reservoirs

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.

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

Geofluids ◽

10.1155/2019/9752623 ◽

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.

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Timing of advanced water flooding in low permeability reservoirs

Mining Science and Technology (China) ◽

10.1016/s1674-5264(09)60023-5 ◽

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

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Study on Areal Sweep Coefficient Under Water Flooding in Ultra-Low Permeability Reservoirs

Proceedings of the International Field Exploration and Development Conference 2018 - Springer Series in Geomechanics and Geoengineering ◽

10.1007/978-981-13-7127-1_14 ◽

2019 ◽

pp. 140-152

Author(s):

He Congge ◽

Xu Anzhu ◽

Zhao Lun ◽

Fan Zifei

Keyword(s):

Water Flooding ◽

Low Permeability ◽

Low Permeability Reservoirs

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

10.2523/iptc-19068-ms ◽

2019 ◽

Author(s):

Ying Li ◽

Haitao Li ◽

Shengnan Chen ◽

Yu Lu ◽

Xiaoying Li ◽

...

Keyword(s):

Water Flooding ◽

Low Permeability ◽

Low Permeability Reservoirs ◽

Dynamic Capillarity

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.594-597.2616 ◽

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.

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