Drilling Fluid Technology for Well SN-2 in Kurdish Oilfield
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摘要: 伊拉克库尔德油田是世界上为数不多的未开发大型油田之一,库尔德地质条件十分复杂,储层高含硫化氢,井漏、井塌、卡钻等复杂事故经常出现,导致钻井周期长、施工难度大、钻井成本高的一系列问题。介绍了SN-2 井安全钻进的钻井液技术。该井应用清水钻进技术、井眼净化技术和平衡封堵防塌技术,解决大井眼失返性漏失的问题和窄密度窗口钻进的难题;应用密度达2.2 g/cm3 的欠饱和盐水钻井液体系,解决盐膏层卡钻和硫化氢处理的问题。通过优选各开次钻井液体系和井下复杂处理技术,SN-2 井钻井周期比邻井缩短65 d。Abstract: Lost circulation borehole collapse and pipe sticking were encountered in the Kurdish Oilfield, leading to prolonged drilling time and high drilling cost. Hydrogen sulfide in the reservoir formations poses threats to human life. The Well SN-2 was drilled with drilling fluid optimized for each interval to solve the problems mentioned above. A 2.2 g/cm3 undersaturated saltwater drilling fluid was used to drill the salt and gypsum formations and to deal with hydrogen sulfide. Time spent drilling the Well SN-2 was 65 days less than the adjacent wells.
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