| 下扬子皖南地区皖泾地2井地质特征与优快钻井对策 |
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| 作者姓名： | 郭军 李岩 王文彬 王超技 |
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| 作者单位： | 1.湖南省煤炭地质勘查院,湖南省地质新能源勘探开发工程技术研究中心,湖南 长沙 410014; 2.安徽省煤田地质局第三勘探队,安徽 宿州 234000 |
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| 基金项目： | 中国地质调查局“重点地区构造体系及油气页岩气控藏条件调查(编号: DD20190085)”和湖南省自然资源科技计划“复杂地质条件区页岩气深井钻探施工技术研究(编号: 202023)”项目联合资助 |
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| 摘 要： | 皖南地区发育有三叠系殷坑组、二叠系大隆组—龙潭组2套油气成藏系统,但区域上构造复杂,断层发育,地层软硬交错、变换频繁,缩径、井漏、井壁垮塌、卡钻等各种复杂情况时常发生,且局部存在高压气层,钻探施工面临巨大挑战。皖泾地2井通过采用随钻堵漏、复合堵漏、页岩专用取心钻头、混合钻头、强抑制性钻井液等技术对策,实现了该井的优快钻进,将钻井周期缩短了24 d,并采用弹韧性双凝双密度固井技术保证了生产套管的固井质量,为下一步的压裂试气作业提供了技术保障。该套技术体系可为今后该区同类工程的优快钻井施工提供借鉴作用。
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| 关 键 词： | 地层特征 复合堵漏 混合钻头 强抑制性 双凝双密度 固井技术 |
| 收稿时间： | 2021-03-19 |
Geological characteristics of Well Wanjingdi 2 and drilling strategy in Southern Anhui of Lower Yangtze region |
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| Authors: | GUO Jun LI Yan WANG Wenbin WANG Chaoji |
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| Institution: | 1. Geological New Energy Exploration and Development Engineering Technology Research Center of Hunan Province, Coal Geological Exploration Institute of Hunan Province, Hunan Changsha 410014, China; 2. Coal Geological Bureau in Anhui Province in the Third Exploration Team, Anhui Suzhou 234000, China |
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| Abstract: | There are two sets of hydrocarbon accumulation systems in Southern Anhui namely, Triassic Yinkeng Formation and Permian Dalong Formation-Longtan Formation. However, this region has developed complex structures and faults, and the soft and hard formations were interlaced with frequent changes. Various complex situ-ations such as reduced diameter, lost circulation, wall collapse and stuck drill often occurred, and there is a high-pressure gas layer locally, which has caused huge challenges during drilling construction. By adopting the technical measures of plugging while drilling, composite plugging, special shale-coring bit, hybrid bit and strong inhibitory drilling fluid, the optimal and fast drilling has been realized in Well Wanjingdi 2, so the drilling cycle has been shortened by 24 days. Besides, the elastic and ductile double condensation and double density cementing technology was used to guarantee the cementing quality of production casing, which provides technical guarantee for the next stage of fracturing and gas testing. This technical system can provie some valuable references for similar drilling projects in the future. |
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| Keywords: | stratigraphic characteristics compound plugging hybrid bit strong inhibition double condensation and double density cementing technology |
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