低渗透凝析气藏储层损害特征及钻井液保护技术

doi:10.7623/syxb201105025

石油学报 ›› 2011, Vol. 32 ›› Issue (5): 893-899.DOI: 10.7623/syxb201105025

低渗透凝析气藏储层损害特征及钻井液保护技术

耿娇娇 1 鄢捷年 1 邓田青 1 鄢小琳 2 舒勇 3

1中国石油大学石油工程教育部重点实验室北京 102249； 2中国石油长城钻探工程有限公司北京 100101； 3中国石油勘探开发研究院北京 100083

收稿日期:2010-11-09 修回日期:2011-01-20 出版日期:2011-09-25 发布日期:2011-11-28
通讯作者: 耿娇娇
作者简介:耿娇娇，女，1984年10月生， 2007年毕业于中国石油大学（北京），现为中国石油大学（北京）石油工程学院在读博士研究生，主要从事油田化学及储层保护研究。
基金资助:
国家自然科学基金项目(No.50974129)和国家科技重大专项（2009ZX05009-005）联合资助。

Characteristics of formation damage and protection drilling fluids for condensate gas reservoirs with low-permeability

GENG Jiaojiao 1 YAN Jienian 1 DENG Tianqing 1 YAN Xiaolin 2 SHU Yong 3

Received:2010-11-09 Revised:2011-01-20 Online:2011-09-25 Published:2011-11-28

摘要/Abstract

摘要：

低渗透凝析气藏储层孔喉细小，渗透性差，黏土含量高，非均质性严重，因而容易因各种入井工作液侵入储层造成水敏、水锁等损害，并经常发生其特有的反凝析损害。结合吐哈油田巴喀低渗透凝析气藏，系统分析了低渗透凝析气藏的储层损害特征。室内评价实验表明，水锁是该储层的主要损害因素之一，渗透率损害率为65.23% ~ 91.01%。在该区原用聚磺钻井液基础上，优选可有效降低油/水界面张力的表面活性剂，应用成膜技术与理想充填 “协同增效”的储层保护新方法，优化设计出保护储层低损害钻井液；通过开展配伍性、动态污染等实验对该钻井液的储层保护特性进行了评价。室内实验结果表明，该钻井液具有良好的流变性与配伍性，可使储层岩心的渗透率恢复值从63.2%增至84.7%，具有明显的储层保护效果。

关键词: 低孔隙低渗透, 凝析气藏, 反凝析损害, 低损害钻井液, 储层保护

Abstract:

Condensate gas reservoirs with low-permeability are characterized by a tiny size of pore throats, poor permeability, high content of clay minerals and severe heterogeneity. Therefore, this type of reservoirs is susceptible to the damage of water sensitivity, water blocking, etc. caused by invasion fluids, and frequently to the damage of specific retrograde condensation. We analyzed mechanisms of formation damage systematically based on reservoir characteristics of the Baka condensate gas reservoir with low-permeability, the results showed that water blocking was the major damage to this reservoir and the damage ratio induced by water blocking ranged from 65.23% to 91.01%. On the basis of the sulphonic polymer drilling fluid previously used in this area, surfactants capable of effectively reducing the interfacial tension of oil/water contact were optimized, a new protection method characteristic of “synergetic effectiveness” by combining film forming with ideal packing was adopted, and consequently a drilling fluid with low damage was developed. The protection effect of this fluid on reservoirs was verified in compatibility tests and dynamic damage tests. The results showed that this fluid was of excellent rheological performance and compatibility, being capable of increasing the returned value of core permeability from 63.2% to 84.7% and of distinct protection of reservoirs.

Key words: low-porosity and low-permeability, condensate gas reservoir, retrograde condensation damage, low-damaging drilling fluid, formation damage control

耿娇娇鄢捷年邓田青鄢小琳舒勇. 低渗透凝析气藏储层损害特征及钻井液保护技术[J]. 石油学报, 2011, 32(5): 893-899.

GENG Jiaojiao YAN Jienian DENG Tianqing YAN Xiaolin SHU Yong. Characteristics of formation damage and protection drilling fluids for condensate gas reservoirs with low-permeability[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(5): 893-899.

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低渗透凝析气藏储层损害特征及钻井液保护技术

Characteristics of formation damage and protection drilling fluids for condensate gas reservoirs with low-permeability

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