湖南永顺永页2井破碎地层取心问题分析与处理对策 |
投稿时间:2021-03-13 修订日期:2021-05-13 点此下载全文 |
引用本文:何焘,张绍和,王文彬,等.湖南永顺永页2井破碎地层取心问题分析与处理对策[J].钻探工程,2021,48(12):14-19.HE Tao,ZHANG Shaohe,WANG Wenbin,et al. Analysis and measures for coring difficulties in Well Yongye-2 in Yongshun of Hunan province[J]. Drilling Engineering, 2021,48(12):14-19. |
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基金项目:国家自然科学基金面上项目“3D 打印栅格状胎体刀刃化唇面对金刚石钻头破碎坚硬岩层的影响机制研究”(编号:41872186);湖南省自然资源科技计划项目“复杂地质条件区页岩气深井钻探施工技术研究”(编号:2020-23) |
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中文摘要:为了解决湖南永顺区块钻遇复杂破碎地层所出现的岩心采取率不足的问题,本文在永页2井的基础上,调查了勘查区的地质构造特征,根据不同地层的取心岩样分析了地层特性。在严格按照钻孔设计及质量要求的前提下,在各个阶段采取了不同的冲洗液,做到无垮塌、无漏失。面对破碎地层岩心采取率不足,研制和使用了一种囊袋多节捆绑式绳索取心钻具,利用其独特的囊袋结构,配以超前侧喷钻头,能够保护岩心免受冲洗液冲刷。结果显示:后续的钻进过程中,井深在1055.76~1108.96 m,岩心采取率由原来的最低79%,提高至90%以上,岩心得到了较好的保护。上述方法能够有效地解决破碎地层出现的岩心采取率不足问题,并能为后续的工作和类似工程提供保障和借鉴。 |
中文关键词:破碎地层 岩心采取率 超前侧喷钻头 囊袋结构 绳索取心钻具 |
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Analysis and measures for coring difficulties in Well Yongye-2 in Yongshun of Hunan province |
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Abstract:In order to solve the problem of insufficient core recovery in broken formation in Yongshun, Hunan Province, this paper investigates the geological structure characteristics of the exploration area with respect to Well Yongye-2, and analyzes the stratum characteristics based on the core samples from different strata. On the premise of strictly following the drilling design and quality requirements, different drilling fluids were adopted for each section to eliminate collapse and leakage. To deal with insufficient core recovery in broken formations, we developed and used a bladder multi-section bundled wireline core drilling tool. The unique bladder structure, equipped with a leading side jet drill bit, can protect the core from erosion by drilling fluid. Field results showed that when drilling deeper well sections with the well depth from 1055.76m to 1108.96m, core recovery increased to more than 90% from the existing lowest 79%, and the cores were well protected. The author believes that the above method can effectively solve the problem of insufficient core recovery in broken formations, and can provide guarantee and reference for follow-up work and similar projects. |
keywords:broken formation core recovery pilot side jet bit bladder structure wireline core drilling |
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