scholarly journals Optimal Selection Method for Sweet Spots in Low-Permeability Multilayered Reservoirs

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Xiangwu Bai ◽  
Zhiping Li ◽  
Fengpeng Lai
Keyword(s):  
Energy Storage ◽  
Production Capacity ◽  
Low Permeability ◽  
Storage Coefficient ◽  
The North ◽  
Flow Capacity ◽  
Low Permeability Reservoirs ◽  
Production Conditions ◽  
Sweet Spots

Low-permeability oil reservoirs account for more than two-thirds of China’s proven reserves, and most of them are multilayered; the traditional sweet spots focus on single-layered reservoirs. The sweet spots of low-permeability reservoirs have two meanings: the geologically superior reservoir and the beneficial development of the reservoir. In this study, a concept of reservoir stratification coefficient is proposed to evaluate the characteristics of multilayered reservoirs, and three indicators are proposed, namely, reservoir stratification coefficient, energy storage coefficient, and stratigraphic coefficient, as the indicators of sweet spots of multilayered reservoirs. The three indicators are combined into a single indicator using a weighted approach, and the sweet spots can be identified based on the combined indicator. The Xiliu A area of the North China oilfield was selected for a case study. According to the structural, sedimentary, and reservoir characteristics of the block, combined with the development and production conditions, the Sha 3 Member I oil group was selected as the study object of sweet spots of the low-permeability reservoir. The results show that the reservoir stratification coefficient, energy storage coefficient, and stratigraphic coefficient proposed in this study are effective indicators for the preferential selection of sweet spots, which can reflect the longitudinal heterogeneity, energy storage size, and flow capacity of multilayered reservoirs. After a comparative analysis with actual blocks, it was found that the results obtained using the method are consistent with the actual capacity of the reservoir. The production capacity is high. The evaluation effect is ideal, and the applicability is good. Thus, this study provides a new technical method for the evaluation of similar multilayered reservoirs. The findings of this study can help for a better understanding of the development and production conditions and optimization basis of low-permeability reservoirs.

A Case Study of Energy Storage Stimulation for Ultra-Low Permeability Oil Reservoir

2017 ◽  
Author(s):  
Wei Liu ◽  
Kai Zhang ◽  
Tao Jiang ◽  
LiMin Yu ◽  
ZhiDong Bao ◽  
...  
Keyword(s):  
Energy Storage ◽  
Low Permeability ◽  
Oil Reservoir

Extending the Limit: Interval Pressure Transient Testing in Low-Permeability Reservoirs in the North Sea

2009 ◽  
Author(s):  
Eivind Hentze Samuelsen ◽  
Adriaan Gisolf ◽  
Vladislav V. Achourov ◽  
Gerardo Seri ◽  
Kare Otto Eriksen
Keyword(s):  
North Sea ◽  
Low Permeability ◽  
Pressure Transient ◽  
The North ◽  
The North Sea ◽  
Low Permeability Reservoirs

4D Geomechanical Research for Fracturing Optimization of Low-Permeability Reservoir

2022 ◽  
Author(s):  
Sheng Zheng ◽  
Wei Zhou ◽  
Xiaoguang Wang ◽  
Liang Chen ◽  
Dan Xie ◽  
...  
Keyword(s):  
Stress Field ◽  
Hydraulic Fracturing ◽  
Oil And Gas ◽  
Production Capacity ◽  
Oil Field ◽  
Wellbore Stability ◽  
Low Permeability ◽  
Reservoir Stimulation ◽  
Single Well ◽  
Low Permeability Reservoirs

Abstract China has abundant low-permeability oil and gas resources. A lot of practice has proved that low-permeability reservoirs must undergo hydraulic fracturing to obtain commercial production capacity. Geomechanical characteristics are the key factor for fracturing. It plays a very important role in the oil field exploration and production. It is not only the driving force for oil and gas migration, but also provides a basis for wellbore stability analysis and drilling optimization design. The state of the formation stress field and the mechanical properties of the rock jointly determine the direction, shape and orientation of the fracture extension of the fracturing. Together it affects the stimulation effect of fracturing. Realizing the high-efficiency development of low-permeability reservoirs is a key and difficult problem facing for oil filed operator. Horizontal wells drilling and hydraulic fracturing are the core technology for increasing single well production in low-permeability reservoirs. The effectiveness of reservoir reconstruction directly determines the production capacity of the reservoir. In order to clarify the influence of static and dynamic geomechanics on the scale of reservoir stimulation in the process of horizontal well fracturing, and ultimately provide effective technical support for the formulation and optimization of reservoir stimulation design. This study is based on the study of single well one-dimensional geomechanics, using the structural characteristics and seismic attributes of low-permeability reservoirs to study the characteristics of the three-dimensional spatial distribution of mechanics. On this basis, combined with real-time fracturing treatment data and micro-seismic monitoring data, dynamic (four-dimensional) stress field simulations are continuously carried out. The research results can be mainly used to guide the optimization of reservoir stimulation and the evaluation of filed development plan.

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