让纳若尔A南凝析气藏CO2吞吐提高凝析油产量研究

doi:10.13809/j.cnki.cn32-1825/te.2020.03.004

Abstract

Abstract:

Serious retrograde condensation has occurred before the development of gas cap in South A condensate gas reservoir of Zanarol Oilfield, resulting in serious loss of condensate oil. It is particularly important to explore the method of improving the production of condensate oil for the further development of oilfield. Therefore, taking a typical well in South A gas reservoir as a example, the phase equilibrium theory and numerical simulation are applied to study the retrograde condensation rule of formation fluid and the distribution of condensate oil in formation. On this basis, the mechanism and effect of condensate oil enhancement by CO₂ huff-n-puff are researched. The results show that retrograde condensation in South A gas reservoir has two stages: constant composition expansion（CCE） and constant volume depletion（CVD）. Condensate oil distributes mainly within 30 m of wellbore, and its saturation ranges from 22.44 % to 29.51 %. The mechanism of CO₂ increasing condensate production is to change the retrograde condensation rule, reduce pressure condition of retrograde condensation, and evaporate condensate oil. However, if the injection volume of CO₂ is low, the volume of vaporized condensate oil will be small, which limits the effect of EOR. Therefore, the cumulative injection of CO₂ should be more than 500×10 ⁴ m ³ at a cycle to ensure the effect of CO₂ huff-n-puff. This study has guiding significance for condensate oil enhancement and plug removal in the middle and later stages of similar condensate gas reservoir development.

Key words: South A condensate gas reservoir, CO₂ huff-n-puff, condensate oil, recovery enhancement, evaluation of retrograde condensation, Zanarol Oilfield

CLC Number:

TE372

HE Anle,ZOU Chunmei,CUI Yinan,YAN Jun,ZHANG Hewen,TANG Yong. Research on enhancing condensate oil production by CO₂ huff-n-puff in South A condensate gas reservoir of Zanarol Oilfield[J].Reservoir Evaluation and Development, 2020, 10(3): 28-32.

Figures/Tables 13

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组分	摩尔分数/%	组分	摩尔分数/%
He	0.04	n-C₄	1.23
N₂	2.67	i-C₅	0.55
CO₂	0.71	n-C₅	0.64
H₂S	0.94	C₆	0.96
C₁	77.68	C₇	1.05
C₂	6.99	C₈	0.86
C₃	3.83	C₉	0.52
i-C₄	0.67	C₁₀⁺	0.66

Research on enhancing condensate oil production by CO₂ huff-n-puff in South A condensate gas reservoir of Zanarol Oilfield

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Research on enhancing condensate oil production by CO2 huff-n-puff in South A condensate gas reservoir of Zanarol Oilfield

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Research on enhancing condensate oil production by CO₂ huff-n-puff in South A condensate gas reservoir of Zanarol Oilfield