• 油气藏评价 •

### 压裂解除凝析气井反凝析伤害的新认识

1. 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,陕西 西安 710018
2. 西南石油大学油气藏地质及开发工程国家重点实验室,四川 成都 610500
• 收稿日期:2017-02-28 出版日期:2018-04-30 发布日期:2018-04-30
• 作者简介:第一作者简介:王少飞(1962—),男,高级工程师,天然气开发综合研究及气田开发管理
• 基金资助:
低渗透油气田勘探开发国家工程实验室开放课题“苏里格气田相图建立及凝析,反凝析现象对气田开发的影响”(技2016-01)

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

Wang Shaofei1,Wang Zhouhua2,Zhang Yaling1,Guo Ping2,Jiao Tingkui1,Du Jianfen2

1. 1.Exploration and Development Research Institute and National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Field, PetroChina Changqing Oil and Gas Field Company, Xi’an, Shaanxi 710018, China
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
• Received:2017-02-28 Online:2018-04-30 Published:2018-04-30

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.

• TE372