Representative Sector Modeling and Key Factors Impact on Waterflooding Performance of a Large Multi-Layered Sandstone Reservoir

Li, Yong; Song, Benbiao; Li, Baozhu; Tian, Chong‐Bin; Zhu, Yongfa; Qian, Qihao

doi:10.2118/185856-ms

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…Depending on the well logs response and final well report (FWR), FZI values were distributed among the reservoir major units, where the unit with good properties has taken a higher FZI value and so on. Based on these subdivisions, the permeability value was obtained using equation (2)(3)(4)(5) and FZI values were specified for each subunit. Figure-3 shows the plot of core and predicted permeability versus depth, which gives an acceptable agreement between core permeability and K-calculated from FZI approach.…”

Section: -1mentioning

confidence: 99%

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Representative Sector Modeling and Waterflooding Performance in Rumaila Oilfield

Shamkhi

Al-Jawad

2021

eijs

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Rumaila supergiant oilfield, located in Southern Iraq has a huge footprint and is considered as the second largest oilfield in the world. It contains many productive reservoirs, some known but without produced zones, and significant exploration potential. A fault divides the field into two domes to the north and south. Mishrif reservoir is the main producing reservoir in the North Rumaila oilfield. It has been producing for more than 40 years and is under depletion. However, it was subjected to water injection processes in 2015, which assisted in recovery and pressure support. Thus, requirements of managing flooding strategies and water-cut limitations are necessary in the next stages of the field life. In this paper, sector modeling was applied to a specific portion of the field, rather than full-field modeling, to accelerate history matching strategy and correlate static to dynamic models’ efficiently, with a minimum level of tolerance. The sector was modeled by surrounding with additional grid blocks and two pseudo wells to achieve a good matching with actual available data. PVT data were used for fluid modeling of a well contained in the sector, and two rock functions were inserted to the model to achieve acceptable history matching. Twelve wells were considered in this research, two of them were injectors and the remaining are producers. For future performance, some of these wells were subjected to new completion and workover processes for field development and pressure maintenance. The importance of the development plan is to represent a way for field development without new wells to be drilled. This was conducted by adding perforations to some wells, plugging the high water-cut production zones, changing production and injection rates, and converting the producers to injectors.

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Section: -1mentioning

confidence: 99%

“…Sector modeling is more convenient to represent a comprehensive field and can accelerate reservoir simulations and characterizations by focusing on the sector only. This helps to construct both geological and dynamic models quickly and easily [5,6].…”

Section: -Introductionmentioning

confidence: 99%

Representative Sector Modeling and Waterflooding Performance in Rumaila Oilfield

Shamkhi

Al-Jawad

2021

eijs

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“…If a formation comprising several layers with diff erent permeability is involved in the process, water mainly fi lls thick zones with higher permeability, without entering thin zones where the permeability is much lower. It has been observed that the permeability of the zones increases as the water passing through them pushes the oil out [13,14].…”

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confidence: 99%

Improvement of oil field development using enhanced oil recovery methods

Moldabayeva¹,

Suleimenova²,

Buktukov³

et al. 2021

Nauk. visn. nat. hirn. univ.

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Purpose. To develop a technology to increase the oil recovery of formations using injection of polymer compositions. Methodology. For this study, practical methods were used such as enhanced oil recovery using stimulating technologies, technology using polymer systems based on a water-soluble polymer acrylamide, and emulsion-polymer technology. To achieve the conformance control, which was a prerequisite for testing, a thorough selection of wells was carried out, as well as an analysis of their hydrodynamic connection. Findings. As a result of using the method for limiting water inflows in the development of oil-bearing formations, redistribution of filtration channels, and a decrease in the production of fossil water as well as stabilisation of water cut were achieved. Originality. The scientific novelty of the study is the withdrawal of wells that are able to redistribute the volume of water injection at perforation intervals. Increased sweep efficiency and pressure at the wellhead at the beginning and at the end of the conformance control indicate a decrease in the conductivity of high-permeability formation intervals. Practical value. Application of the proposed technology for limiting water inflows will make it possible to develop low-permeability interlayers with filtration flows. The wells brought to a stable production rate during the study will ensure a decrease in formation water production and the water cut of the produced products, as well as stabilisation of the water cut over a certain period.

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Feasibility of Sector Modeling Approach in a Giant Petroleum Field

2020

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The decision analysis process to develop a petroleum field can be very complex. This process contemplates a set of tasks, which include the study of various representative scenarios, and different production strategies that aid decision-making. However, when it comes to giant reservoirs, the computational requirements of the respective simulation models may be too high. High computational cost may demand simplification that may yield suboptimal solutions so it is desirable to find simplifications that preserve the quality of the solutions. One approach to reduce the simulation requirements is to divide the reservoir into sectors, and to use sector models isolated in the decision making process. This study evaluates the feasibility of using a model of an isolated sector from a giant reservoir in the management of this sector. The observed decrease in the simulation time of the isolated model makes this methodology attractive. However, it is necessary to evaluate in advance the impacts of its use on the flow behavior of this sector when inserted in the Full Field model. The case study presented is a deterministic realization of a reservoir with analogous characteristics to the Mero pre-salt field, with high communication along the reservoir. The global differences found between the isolated model and the Full Field model presented a range that justifies the use of the isolated model in the development process of this sector, without losing significant accuracy in the results. A methodology is proposed to evaluate the differences between both models using field and well indicators. Discussions about the impact of local differences between the two models are presented. The causes of these differences were investigated and attributed to three main factors: the production strategy; changing of boundary conditions; and rock properties of the model.

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Representative Sector Modeling and Key Factors Impact on Waterflooding Performance of a Large Multi-Layered Sandstone Reservoir

Cited by 3 publications

References 9 publications

Representative Sector Modeling and Waterflooding Performance in Rumaila Oilfield

Representative Sector Modeling and Waterflooding Performance in Rumaila Oilfield

Improvement of oil field development using enhanced oil recovery methods

Feasibility of Sector Modeling Approach in a Giant Petroleum Field

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