Quantitative evaluation of water injection composition in high injection-production ratio blocks - Taking Chao 5 well block as an example

According to the features of low porosity and low permeability fracture as well as small scale of channel development, frequent sedimentary facies changes of planar sandstone, poor connectivity, large variation of sequence thickness and great development difficulties for oil layer in Fuyang Oilfield. In this paper, on the basis of fully considered of fracture features, built a more accurate 3-D geological model. And on the basis of the history matching, determined the formation pressure maintenance level under different injection-production ratio and rational water-flooding timing by the simulation of the different programs in the process advanced water injection development. The results show that: the reasonable injection-production ratio of Fuyang oil layer is 1.4, and the rational water-flooding timing is three months after advanced water injection. This provides theoretical guidance for the large-scale development of Fuyang oil layer, and also provides the technical basis for the developing of the other low permeability fractured oil field by advanced water injection.

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A method for determining rational fluid production scale in conglomerate reservoir in the stage of high water cut

E3S Web of Conferences ◽

10.1051/e3sconf/202132901048 ◽

2021 ◽

Vol 329 ◽

pp. 01048

Author(s):

Wentao Liu ◽

Xiaodong Wang ◽

Chaoliang Zhang ◽

Rui Xue ◽

Guifang Zhu ◽

...

Keyword(s):

Formation Energy ◽

Water Injection ◽

Reference Value ◽

High Water ◽

Theoretical Research ◽

Reservoir Water ◽

Production Scale ◽

Production Ratio ◽

High Water Cut ◽

Water Cut

In view of the problem that water cut rises quickly in conglomerate reservoirs with high water cut, based on the variation law of reservoir water injection and liquid production characteristics, a method for determining the maximum liquid production scale in conglomerate reservoirs with high water cut is established by using reservoir engineering and field statistics.Considering the maximum liquid production capacity at the well end, the maximum injection capacity at the well end and the injecting-production ratio limit to keep the formation energy, a method to determine the maximum liquid production scale in conglomerate reservoir is established to keep the formation energy sufficient.This method ensures that the injection and production ends of the reservoir are coordinated and matched, and the formation energy is sufficient, so that the reservoir development keeps a benign cycle.The research method and conclusion have important reference value and significance for theoretical research and practical application of ultra-high water cut oilfield development.

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Discussion of the Key Factors in Oil Spill Risk Prevention in Offshore Oilfield Development

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.655-657.2216 ◽

2013 ◽

Vol 655-657 ◽

pp. 2216-2219

Author(s):

Xue Fei Li ◽

Yan Gang Yang

Keyword(s):

Oil Spill ◽

Water Injection ◽

Oil Field ◽

Control Measures ◽

Risk Prevention ◽

Water Flooding ◽

Key Factors ◽

Field Development ◽

Injection Process ◽

Production Ratio

Water injection was a widely used method for oil exploration in China. The defects of water injection process，inject water quality exceed standard, Unreasonable of injection-production ratio and ,invalid of well control measures, during the water flooding process，may lead to These factors may lead to the occurrence of geological oil spill accident. This paper introduced and discussed these key factors which may lead to oil spill accident, in oil field development processes, for risk prevention and environmental protection in water flooding process.

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Study on Evaluation Method of Water Injection Efficiency in Low-Permeability Reservoir

Geofluids ◽

10.1155/2021/6616569 ◽

2021 ◽

Vol 2021 ◽

pp. 1-6

Author(s):

Qiang Yu ◽

Xinjie Wang ◽

Yifei Wang ◽

Xingjiao Zhang

Keyword(s):

Development Strategy ◽

Evaluation Method ◽

Water Injection ◽

Low Permeability ◽

Well Test ◽

Well Test Analysis ◽

Test Analysis ◽

Low Permeability Reservoir ◽

Production Ratio ◽

Ultralow Permeability

Low-permeability reservoirs, especially ultralow-permeability reservoirs, usually show a problem of ineffective water injection which leads to low pressure with high injection-production ratio. It is urgent to determine the direction and proportion of ineffective water injection, so as to guide the adjustment of water injection development. Based on the theory of percolation mechanics and combined with the modern well test analysis method, the determination method of effective water injection ratio was established. This method can not only judge the direction of injected water but also determine the proportion of invalid injected water. This method was applied on typical oil reservoirs; the evaluation results showed that extremely low permeability and ultralow permeability usually exist the situation of water holding around the injected well which is almost 20% of the injected water. Some areas existed the water channeling; the evaluation results showed that the water channeling was closely related with sedimentary microfacies rather than microfractures, and the invalid injection accounts are about 45% of the injected water. The method is simple and feasible, which can provide technical reference for the development strategy adjustment of water drive development in low-permeability reservoir.

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Research on optimization of development technology policy for low-permeability and low-pressure reservoir in Yangbaishan Block

E3S Web of Conferences ◽

10.1051/e3sconf/201911801029 ◽

2019 ◽

Vol 118 ◽

pp. 01029

Author(s):

Xiulan Zhu ◽

Yanlong Ran ◽

Yidong Yuan

Keyword(s):

Technology Policy ◽

Water Injection ◽

Low Pressure ◽

Energy Deficit ◽

Low Permeability ◽

Oil Well ◽

Production Ratio ◽

Natural Energy ◽

Well Pattern ◽

Development Technology

There are poor physical properties and insufficient natural energy in the low-permeability and low-pressure reservoir of the Yangbaishan Block. Early this reservoir was mined by natural energy with a serious producing energy deficit. Subsequently, it was developed with mild water injection. During the water injection development, water quickly slid into the oil well along the crack, oil production decreased sharply and water content increased rapidly in the oil well, the water flooded well and the ineffective well gradually increased. Therefore, based on the reservoir geological characteristics, principle of injection and production balance is used to optimize reasonably for the development technology policy. Research indicates that the square inverted nine spot flooding pattern is recommended with a reasonable injection well direction of NE 72°and technical well spacing of 150 m. Reasonable injection-production ratio should be 2.16, reasonable technical well pattern density is 23 wells per square kilometer, and the average daily water injection rate of single well should be 11 m3. When injection-production system and injection proration are improved, water drive controlled degree is expected to increase by 16 %. This research can provide reference for the efficient development and safety management of other similar reservoirs.

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Study on Reasonable Injection-Production Parameters of Water-Flooding Reservoir: A Case Study of Daqing Oilfield

E3S Web of Conferences ◽

10.1051/e3sconf/202132901065 ◽

2021 ◽

Vol 329 ◽

pp. 01065

Author(s):

Cong Nie

Keyword(s):

Oil Recovery ◽

Water Injection ◽

Water Flooding ◽

Evaluation Indexes ◽

The Third ◽

Production Parameters ◽

Production Ratio ◽

Optimization Principle ◽

Water Cut

This paper, by conducting comprehensive analysis on water-flooding reservoir, intensively studied and discussed the characteristics of geological development, determined the evaluation indexes of development effect, carried out research from five steps, the first is the introduction part, it conducted indepth study and discussion from research background, research significance, literature review, and research methods four aspects. The second outlined the related theory from the optimization principle and mechanism of injection-production parameters, and the distribution mechanism of remaining oil two aspects. The third analyzed the current situation of reasonable injection-production of water-flooding reservoirs in Daqing Oilfield from reservoir characteristics and reservoir deposition. The fourth evaluated the water-flooding development effect from combined water cut, changing conditions of production and predicted recovery ratio. The fifth intensively studied the reasonable injection-production parameters of water- flooding reservoirs in Daqing oilfield from design of separated layer water injection plan, maintaining level reservoir formation pressure, and reasonable plan of injection-production ratio and oil recovery rate three aspects, and provides theoretical guidance for later targeted excavation of water-flooding reservoirs.

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