Necessity and feasibility of PetroChina mature field redevelopment

Hu, Wenrui

doi:10.1016/s1876-3804(08)60001-4

Cited by 51 publications

(12 citation statements)

References 8 publications

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“…The use of horizontal drilling has also been chiefly applied to Chinese giant fields [46], as well as high frequency vibration recovery enhancement and thermal recovery technologies [47]. The necessity and feasibility of development of many mature fields in China have been compiled by Hu [48].…”

Section: Production Overviewmentioning

confidence: 99%

Development journey and outlook of Chinese giant oilfields

Höök

Tang

Pang

et al. 2010

Petroleum Exploration and Development

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Abstract:Over 70% of China's domestic oil production is obtained from nine giant oilfields. Understanding the behaviour of these fields is essential to both domestic oil production and future Chinese oil imports. This study utilizes decline curves and depletion rate analysis to create some future production outlooks for the Chinese giants. Based on our study, we can only conclude that China's future domestic oil production faces a significant challenge caused by maturing and declining giant fields. Evidence also indicates that the extensive use of water flooding and enhanced oil recovery methods may be masking increasing scarcity and may result in even steeper future decline rates than the ones currently being seen. Our results suggest that a considerable drop in oil production from the Chinese giants can be expected over the next decades.

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Section: Production Overviewmentioning

confidence: 99%

Development journey and outlook of Chinese giant oilfields

Höök

Tang

Pang

et al. 2010

Petroleum Exploration and Development

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“…Pilot design plays a vital role in the road map of EOR planning and risk reduction. Therefore, EOR pilots are conducted to reduce uncertainty in EOR performance [1][2][3][4]. In the last 50 years, a significant number of EOR field pilots has been studied and the gained experience has been used in the oil and gas industry [5].…”

Section: Introductionmentioning

confidence: 99%

An integrated Shannon Entropy and reference ideal method for the selection of enhanced oil recovery pilot areas based on an unsupervised machine learning algorithm

Motahhari

Rafizadeh

Ahmadi

2021

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Pilot-scale enhanced oil recovery in hydrocarbon field development is often implemented to reduce investment risk due to geological uncertainties. Selection of the pilot area is important, since the result will be extended to the full field. The main challenge in choosing a pilot region is the absence of a systematic and quantitative method. In this paper, we present a novel quantitative and systematic method composed of reservoir-geology and operational-economic criteria where a cluster analysis is utilized as an unsupervised machine learning method. A field of study will be subdivided into pilot candidate areas, and the optimized pilot size is calculated using the economic objective function. Subsequently, the corresponding Covariance (COV) matrix is computed for the simulated 3-D reservoir quality maps in the areas. The areas are optimally clustered to select the dominant cluster. The operational-economic criteria could be applied for decision making as well as the proximity of each area to the center of dominant cluster as a geological-reservoir criterion. Ultimately, the Shannon entropy weighting and the reference ideal method are applied to compute the pilot opportunity index in each area. The proposed method was employed for a pilot study on an oil field in south west Iran.

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“…According to statistics, most of the large old oilfields (Daqing oilfield, Shengli oilfield, and Zhongyuan oilfield) have entered or approached the ultrahigh water-cut stage, and the average water-cut in these oilfields is above 90%. 13,14 Many scholars 15−23 have found that after large-scale and long-term waterflooding, reservoir physical properties such as the pore throat structure and rock wettability may change, thus leading to the increase of displacement efficiency and the decrease of residual oil saturation, which can usually improve the development effect on reservoirs. Through a number of waterflooding experiments on different types of cores, Loahardjo et al 24 confirmed that in the process of sequential waterflooding, the residual oil saturation decreased significantly from one flood to the next.…”

Section: Introductionmentioning

confidence: 99%

Novel Method for Inverted Five-Spot Reservoir Simulation at High Water-Cut Stage Based on Time-Varying Relative Permeability Curves

et al. 2020

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After large-scale and long-term waterflooding, reservoir physical properties such as the pore throat structure and rock wettability may change. In this paper, the relative permeability curves under different water injection volumes through core-flood experiments were used to characterize the comprehensive changes of various reservoir physical properties at high water-cut stage. The novel concept of "water cross-surface flux" was proposed to characterize the cumulative flushing effect on the reservoir by injected water, and a novel method for inverted five-spot reservoir simulation at high water-cut stage based on time-varying relative permeability curves was established. From the relative permeability curves measured through two cores from the X oilfield under different water injection volumes (100, 500, 1000, 1500, and 2000 PV), it is found that with the increase of injected water volume, the two-phase co-flow zone becomes wider, the water permeability under residual oil saturation increases, and the residual oil saturation decreases. A waterflooding core model was established, simulated, and verified by the method proposed in this paper. It is found that using time-varying permeability curves for simulation, the highest oil recovery factor (61.58%) can be obtained with injected water volume up to 2000 PV, and the purpose of improved oil recovery (IOR) can be achieved by high water injection volume, but the increment is only approximately 10%. Besides, a waterflooding model of an inverted five-spot reservoir unit based on the X oilfield was also established, simulated, and analyzed. Simulation results have shown that no matter which set of core permeability curves measured from 100 to 2000 PV is directly used alone, the oil recovery factor will be simulated inaccurately. The findings of this study can help in better understanding the quantitative description of the oil recovery changes with time-varying reservoir physical properties in high water-cut reservoirs during waterflooding.

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Necessity and feasibility of PetroChina mature field redevelopment

Cited by 51 publications

References 8 publications

Development journey and outlook of Chinese giant oilfields

Development journey and outlook of Chinese giant oilfields

An integrated Shannon Entropy and reference ideal method for the selection of enhanced oil recovery pilot areas based on an unsupervised machine learning algorithm

Novel Method for Inverted Five-Spot Reservoir Simulation at High Water-Cut Stage Based on Time-Varying Relative Permeability Curves

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