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Experimental study of low-damage drilling fluid to minimize waterblocking of low-permeability gas reservoirs

查看全文 作　　者：Zhang [1]Hongxia;Yan [1]Jienian;Lu [2]Yu;Shu [1]Yong;Zhao [1]Shengying 高影响力作者 机构地区：[1]Key Laboratory of Petroleum Engineering, Ministry of Education, China University of Petroleum, Beijing 102249, China;[2]Drilling Fluid Branch, Great Wall Drilling Company, PetroChina; Panjin, Liaoning 124010, China高影响力机构 出　　处：《Petroleum Science》索引2009年第6卷第3期,共6页高影响力期刊 基　　金：the Committee of the National HighTechnology Research and Development Program of China(863 Program) for providing financial support for thisresearch project (Project No.2006AA06A109);the support provided by the Changjiang Scholarsand Innovative Research Team(No.IRT0411),Ministry ofEducation,China. 摘　　要：This paper discusses the systematic design and development of low-damage drilling fluid to protect the low-permeability gas reservoir of the Sulige block in the Ordos Basin,Inner Mongolia Autonomous Region,China.Based on investigation of the geological characteristics and the potential formation damage of the Permian formation of the reservoir,waterblocking due to invasion of drilling or completion fluids was identified one of the most severe causes of damage to gas well deliverability.By adopting the phase trap prevention method,ideal packing theory,and film-forming technology,a low- damage drilling fluid,sodium formate brine containing efficient waterblocking preventing surfactants, optimized temporary bridging agents(TBAs),and film-forming agents has been developed.The performance of the new drilling fluid was evaluated by using a variety of techniques.The results show that the fluid has good rheological properties,good strong shale-swelling inhibition,good temporary plugging effect,ultra-low filtration,and good lubricity.It can efficiently minimize waterblocking and can be used to drill horizontal wells with minimal intervention of the reservoir in the Sulige Gas Field. 关 键 词：低渗透油气藏 地层损害 钻井液 苏里格气田 实验 鄂尔多斯盆地 内蒙古自治区 成膜技术
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