| 摘要: |
| 胜利浅海埕岛油田沙河街组地层粘土含量高,粘土组成以伊/蒙混层和伊利石为主，地层水敏性较弱，微裂缝 及层理较发育。钻井液及滤液沿层理和微裂缝渗人地层内部，引起硬脆性泥页岩剥落坍塌。针对沙河街组地层特 点，研制出一种强抑制性多元醇海水钻井液体系,并对其进行了性能评价及防塌机理分析。室内试验结果表明，该 钻井液体系具有较好的抑制性能和流变性，抗海水和劣质土污染的能力较强，环境可接受性好。现场实践证明，该 钻井液性能稳定,维护处理简单,能有效解决沙河街组地层钻进中出现的技术难题，避免复杂情况的发生。 |
| 关键词: 强抑制性 多元醇 海水钻井液 性能评价 井壁稳定 埕岛油田 沙河街组 |
| DOI： |
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| 基金项目:“十五”国家科技攻关项目(2002BA312B) |
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| Study and application of polyglycol seawater drilling fluids with strong inhibition |
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LU Kai-he, QIU Zheng-song, XU Jia-fang
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(College of Petroleum Engineering in China University of Petroleum , Dongying 257061，Shandong Province, China )
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| Abstract: |
| Shahejie formation in Chengdao Oilfield is characterized by high content of clay minerals that are mainly illite and illite/montmorillonite, slight swellability and development microfracture and horizontal beddings. Drilling fluid and its filtrate can easily penetrate into such formation, which can result in borehole collapse. According to the characters of Shahejie formation in Chengdao Oilfield, .polyglycol seawater drilling fluid with strong inhibition was developed. The properties of this drilling fluid were evaluated, and its anti-collapse mechanism was analyzed. The results of in-house test indicate that the drilling fluid is characterized by good rheological property, low filtrate loss, superior collapse-preventing effectiveness, strong seawater and clay resistance and environmentally friendly character. The field tests show that the drilling fluid has stable properties and convenient conditioning, the questions appearing in Shahejie formation during drilling can be effectively resolved and avoid the complex situations emergency. |
| Key words: strong inhibition polyglycol seawater drilling fluid performance evaluation hole stability Chengdao Oilfield Shahejie formation |
