Fine characterization of large composite channel sandbody architecture and its control on remaining oil distribution: A case study of alkaline-surfactant-polymer (ASP) flooding test area in Xingshugang oilfield, China

Gao, Shuai; Chen, Shumin; Pu, Hui; Gong, Lili; Ma, Shizhong; Luo, Qingyong; Wang, Xixin; Gao, Ang; Zhang, Binchi

doi:10.1016/j.petrol.2018.12.033

Cited by 9 publications

(8 citation statements)

References 20 publications

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“…(5) Horizontal spacing of lateral accretion interbeds: the lateral accretion interbed connecting two wells with small well spacing extended along the lateral accretion direction and intersected with the top surface of the point bar [15]. The projected distance on the plane between the intersection points of adjacent lateral accretion interbeds was the horizontal spacing of lateral accretion interbeds, L 2 (Figure 7).…”

Section: Single-channel Division and Internal Architecturementioning

confidence: 99%

“…Four remaining planar oil distribution types (abandoned channel occlusion type (Figure 13a), interfluvial sand body occlusion type (Figure 13b), interwell retention type (Figure 13c) and well pattern uncontrollable type (Figure 13d)) and three remaining vertical oil distribution types (in-layer interlayer occlusion type (Figure 13e), rhythm type (Figure 13f) and gravity type (Figure 13g) were classified (Table 4). Blocked by the abandoned channel, the remaining oil is rich at the edge of abandoned channel [15].…”

Section: Remaining Oil Distribution Lawmentioning

confidence: 99%

“…The reservoir sand body is widely distributed, and remaining oil uncontrolled by the well pattern is formed at its edge or extension area, with poor physical properties [15].…”

Section: Well Pattern Uncontrollable Typementioning

confidence: 99%

“…Over time, polymer flooding has been the key area of study for remaining oil distribution, replacing water flooding [11][12][13]. In terms of oilfield development after polymer flooding, the complex reservoir architecture has taken on a significant role in determining the remaining oil distribution [14,15]. To further enhance oil recovery, in-depth studies on the impact of reservoir architecture on the remaining spatial oil distribution after polymer flooding are crucial [16,17].…”

Section: Introductionmentioning

confidence: 99%

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Remaining Oil Distribution Law and Development Potential Analysis after Polymer Flooding Based on Reservoir Architecture in Daqing Oilfield, China

Bai

Guo

et al. 2023

Polymers

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Polymer flooding has drawn more and more attention in the world for its high incremental oil recovery factor and relative low costs compared with water flooding and other chemically enhanced oil recovery techniques. However, for many oilfields, such as Daqing Oilfield, China, that have already been flooded with polymers, how to further improve recovery remains a big problem. Traditional intralayer, interlayer and plane heterogeneity studies cannot accurately characterize the remaining oil distribution after polymer flooding. To solve this problem, we established a method to quantitatively describe the reservoir’s architecture. Then, the architecture elements were dissected hierarchically and the interface of each architecture level in Daqing Oilfield was identified. The distribution pattern and development potential of the remaining oil after polymer flooding under the influence of reservoir architecture was analyzed. The results show that, regarding the sedimentary process from north to south in Daqing Oilfield, the channel becomes narrower, the thickness decreases, the point bar’s width increases and the thickness of the meandering river decreases. The braided bar scale becomes larger and the thickness becomes smaller in the braided river. According to the reservoir’s architecture, the remaining oil was divided into four categories of plane remaining oil (abandoned channel occlusion type, interfluvial sand body occlusion type, inter-well retention type and well pattern uncontrollable type) and three types of vertical remaining oil (in-layer interlayer occlusion type, rhythm type and gravity type). About 40% of the original oil in place (OOIP) of Daqing Oilfield has not yet been produced, which indicates that there is great potential for development. This study is important for improving oil recovery in polymer-flooded reservoirs.

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Section: Single-channel Division and Internal Architecturementioning

confidence: 99%

Section: Remaining Oil Distribution Lawmentioning

confidence: 99%

“…The reservoir sand body is widely distributed, and remaining oil uncontrolled by the well pattern is formed at its edge or extension area, with poor physical properties [15].…”

Section: Well Pattern Uncontrollable Typementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Remaining Oil Distribution Law and Development Potential Analysis after Polymer Flooding Based on Reservoir Architecture in Daqing Oilfield, China

Bai

Guo

et al. 2023

Polymers

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“…The time-varying phenomenon by using water-sensitive functions in the commercial numerical simulators was approximately characterized [37][38][39][40][41][42][43][44]. However, the conversion process is complex and the reliability is poor, which is difficult to accurately reflect the time-varying law of reservoir parameters.…”

Section: Introductionmentioning

confidence: 99%

Remaining Oil Distribution and Development Strategy for Offshore Unconsolidated Sandstone Reservoir at Ultrahigh Water-Cut Stage

et al. 2022

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Due to the influence of long-term waterflooding, the reservoir physical properties and percolation characteristics tend to change greatly in offshore unconsolidated sandstone reservoirs at ultrahigh water-cut stage, which can affect the remaining oil distribution. Remaining oil characterization and proper development strategy-making are of vital importance to achieve high-efficiency development of mature reservoirs. The present numerical simulation method is difficult to apply in reservoir development due to the problems of noncontinuous characterization and low computational efficiency. Based on the extended function of commercial numerical simulator, the time-varying equivalent numerical simulation method of reservoir physical properties was established, and the research of numerical simulation of X offshore oilfield with 350,000 effective grids was completed. The results show that the time-varying reservoir properties have a significant impact on the distribution of remaining oil in ultrahigh water-cut reservoir. Compared with the conventional numerical simulation, the remaining oil at the top of main thick reservoir in X oilfield has increased by 18.5% and the remaining oil in the low-permeability zone at the edge of the nonmain reservoir has increased by 27.3%. The data of coring well and the implementation effect of measures in the X oilfield are consistent with the recognition of numerical simulation, which proves the rationality of numerical simulation results. The new method is based on a mature commercial numerical simulator, which is easy to operate and has reliable results.

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Implications of hot chemical–thermal enhanced oil recovery technique after water flooding in shale reservoirs

Fan

et al. 2020

Energy Reports

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Fine characterization of large composite channel sandbody architecture and its control on remaining oil distribution: A case study of alkaline-surfactant-polymer (ASP) flooding test area in Xingshugang oilfield, China

Cited by 9 publications

References 20 publications

Remaining Oil Distribution Law and Development Potential Analysis after Polymer Flooding Based on Reservoir Architecture in Daqing Oilfield, China

Remaining Oil Distribution Law and Development Potential Analysis after Polymer Flooding Based on Reservoir Architecture in Daqing Oilfield, China

Remaining Oil Distribution and Development Strategy for Offshore Unconsolidated Sandstone Reservoir at Ultrahigh Water-Cut Stage

Implications of hot chemical–thermal enhanced oil recovery technique after water flooding in shale reservoirs

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