A new cognition of the reduction of retrograde condensation damage in gas condensate wells by fracturing

Wang Shaofei; Wang Zhouhua; Zhang Yaling; Guo Ping; Jiao Tingkui; Du Jianfen

doi:10.13809/j.cnki.cn32-1825/te.2018.02.005

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A new cognition of the reduction of retrograde condensation damage in gas condensate wells by fracturing

更新时间：2025-12-05

- A new cognition of the reduction of retrograde condensation damage in gas condensate wells by fracturing
- Petroleum Reservoir Evaluation and Development Issue 2, Pages: 30-34(2018)
- 作者机构：
  
  1. 中国石油长庆油田分公司勘探开发研究院低渗透油气田勘探开发国家工程实验室
  2. 西南石油大学油气藏地质及开发工程国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13809/j.cnki.cn32-1825/te.2018.02.005
  CLC： TE372
- Published：2018
- 稿件说明：
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[1]王少飞,汪周华,张雅玲,郭平,焦廷奎,杜建芬.压裂解除凝析气井反凝析伤害的新认识[J].油气藏评价与开发,2018,8(02):30-34.

Wang Shaofei, Wang Zhouhua, Zhang Yaling, et al. A new cognition of the reduction of retrograde condensation damage in gas condensate wells by fracturing[J]. Petroleum Reservoir Evaluation and Development, 2018, (2): 30-34.
[1]王少飞,汪周华,张雅玲,郭平,焦廷奎,杜建芬.压裂解除凝析气井反凝析伤害的新认识[J].油气藏评价与开发,2018,8(02):30-34. DOI： 10.13809/j.cnki.cn32-1825/te.2018.02.005.

Wang Shaofei, Wang Zhouhua, Zhang Yaling, et al. A new cognition of the reduction of retrograde condensation damage in gas condensate wells by fracturing[J]. Petroleum Reservoir Evaluation and Development, 2018, (2): 30-34. DOI： 10.13809/j.cnki.cn32-1825/te.2018.02.005.

摘要

压裂可提高油气藏单井产量是普遍认同的观点

但是否能降低凝析气藏反凝析伤害的程度亟待深入探讨。采用室内岩心实验、单井数值模拟方法

对比分析了压裂前后反凝析对气相渗透率、近井区反凝析油饱和度、单井产量及采收率的影响。研究表明

压后反凝析伤害程度更加严重、伤害时机更早

但裂缝降低了凝析油临界流动饱和度。衰竭过程中

压后气相的有效渗透率始终大于压前值

气相流动能力大幅度提高。压后单井初期采气速度高、地层压力降低快、反凝析伤害更加突出;与压前比较

凝析油采收率降低3.48%、天然气采收率提高6.6%。因此

压裂并不能有效降低反凝析伤害的程度

但可提高气相流动能力

从而提高凝析气井的天然气产量。

Abstract

Generally speaking

the fracturing can improve the reservoir single well production

however

whether it can reduce the retrograde condensation damage in gas condensate wells or not is urgent to be discussed further. By adopting the indoor core laboratory and single well numerical simulation method

we analyze the impacts of retrograde condensation on the gas phase permeability

the retrograde gas condensate saturation near the wellbore zone

the single well production and the recovery ratio before and after fracturing. The research shows that

after fracturing

the retrograde condensation damage is more serious and the damage time is earlier. However

the fractures reduce the condensate oil critical flow saturation. In the process of the depletion exploitation

the effective permeability value of the fractured gas phase is always larger than the value before fracturing. In addition

the gas phase flow ability increases substantially. After fracturing

the gas recovery speed of the single well is fast

the formation pressure reduces rapidly and the retrograde condensation damage is more serious. Furthermore

the recovery ratio of the condensate oil reduces by 3.48 % and the recovery ratio of the natural gas improves by 6.6 %. Accordingly

it concludes that

fracturing can’t effectively reduce the degree of the retrograde condensation damage

but it can improve the flow ability of the gas phase and the gas production of the gas condensate wells.

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