Study and Application of Design Optimization of Horizontal Wells in a Thick Positive Rhythm Oil Layer

Cui, Can; Sheng, Guanquan; Liu, H.-Q.; Yanzhoung, W.

doi:10.1080/10916466.2010.551228

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…For the high structural and inter-well parts, as the stratum dip increases, the production range becomes larger, and the performance of P2 gradually improves. (2) Sedimentary rhythm and well type The water flooding field application indicates that the sedimentary rhythm mode of the reservoir is closely related to reservoir development performance [43]. The physical properties and oil saturation of the lower part of positive rhythm oil layer are better than those of the upper part, and the utilization degree of the lower part is also higher.…”

Section: ) Stratum Dipmentioning

confidence: 99%

Synergistic Modes and Enhanced Oil Recovery Mechanism of CO2 Synergistic Huff and Puff

Hou

Zhao

et al. 2021

Energies

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With the gradual declining of oil increment performance of CO2 huff-and-puff wells, the overall oil exchange rate shows a downward tendency. In this regard, CO2 synergistic huff-and-puff technologies have been proposed to maintain the excellent effect and extend the technical life of such wells. However, there is no specific research on the mechanism and synergistic mode of CO2 huff and puff in horizontal wells. This study aims to establish the synergistic mode and determine the adaptability and acting mechanism of CO2 synergistic huff and puff. Three synergistic huff-and-puff modes are proposed based on the peculiarity of the fault-block reservoir’s small oil-bearing area and broken geological structure. We establish three typical CO2 synergistic huff-and-puff models and analyze the influence of different geological and development factors on the huff-and-puff performance with numerical simulation. Each factor’s sensitivity is clarified, and the enhanced oil recovery (EOR) mechanism of CO2 synergistic huff and puff is proposed. The sensitivity evaluation results show that the reservoir rhythm, inter-well passage, well spacing, high-position well liquid production rate, and middle-well liquid production rate are extremely sensitive factors; the stratum dip and injection volume allocation scheme are sensitive factors; and the relationship with structural isobaths is insensitive. The EOR mechanism of synergistic huff and puff includes gravity differentiation, supplementary formation energy, CO2 forming foam flooding, and coupling effect of production rate and oil reservoirs. The implementation conditions of the two-well cooperative stimulation mode are the simplest. The two-well model is suitable for thick oil layers with a positive rhythm and large formation dip. The single-well mode requires no channeling between the wells, and the multi-well mode requires multi-well rows and can control the intermediate well’s fluid production rate. Field application at C2X1 block shows a good performance with a total oil increment of 1280 t and an average water-cut reduction of 57.7%.

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Section: ) Stratum Dipmentioning

confidence: 99%

Synergistic Modes and Enhanced Oil Recovery Mechanism of CO2 Synergistic Huff and Puff

Hou

Zhao

et al. 2021

Energies

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“…Many efforts have been made to further improve oil recovery after water flooding in thick reservoirs with positive rhythm, including perfecting well patterns, optimising water injection modes, and using horizontal wells (Gu and Zhai, 2005;Wang et al, 2006;Tan, 2009;Al-Hinai et al, 2010;Cui et al, 2010;Wang et al, 2012;Liu, 2012;Ding et al, 2013;Qu et al, 2014). Although gas flooding has been considered as a potential tertiary oil recovery technique, little research has focused on it in such reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of immiscible CO<SUB align="right">2 flooding in thick reservoirs with positive rhythm

Wang

Yang

Song

et al. 2017

PCFD

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Abstract:Benefitting from the development of carbon capture and storage (CCS) technology, CO 2 flooding for enhanced oil recovery (EOR) has become increasingly attractive to the petroleum industry. This paper presents a numerical study about the feasibility and efficiency of the immiscible CO 2 flooding process, which is a potential tertiary oil recovery method for use after water flooding, with advantages of lower cost and fewer facility requirements than miscible CO 2 flooding. A numerical simulation model established from laboratory experimental results was used to predict fluid behaviour and influence factors of immiscible CO 2 flooding in thick reservoirs with positive rhythm to enhance oil recovery after water flooding. Injection and confining pressure conditions are both important to the displacement process and results.

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Study and Application of Design Optimization of Horizontal Wells in a Thick Positive Rhythm Oil Layer

Cited by 2 publications

References 2 publications

Synergistic Modes and Enhanced Oil Recovery Mechanism of CO2 Synergistic Huff and Puff

Synergistic Modes and Enhanced Oil Recovery Mechanism of CO2 Synergistic Huff and Puff

Numerical study of immiscible CO<SUB align="right">2 flooding in thick reservoirs with positive rhythm

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