摘要
雪峰山先导孔是部署在湘西北沅麻盆地麻阳向斜的一口页岩气地质调查井。钻遇地层松散破碎、裂隙发育、软硬互层等,钻进中极易出现漏失、卡钻、埋钻、岩心掉落等孔内复杂情况,严重影响了钻进效率。针对钻进过程中遇到的复杂地层及钻进技术难点,如裂隙发育地层钻井液漏失和涌水问题、松散破碎地层岩心采取问题、水敏性地层孔壁稳定性问题,提出了针对性的解决措施,包括:改进取心钻具,采用不提钻换内钻头拦簧护心绳索取心钻具;优化钻井液配方,采用微泡沫钻井液以及膨润土+褐煤树脂+广谱护壁剂Ⅲ型+抗高温抗盐降失水剂+石灰石粉的钻井液配方;采取针对性的施工管理措施。提高了钻进效率,钻井质量满足地质要求,有效地完成了钻井施工任务,为同类型页岩气调查井的钻井施工提供技术参考。
The Xuefengshan pilot hole is a shale gas geological survey hole deployed in the Mayang syncline in the Yuanma Basin in Western Hunan.This paper introduces the engineering and geological conditions of the borehole with focus on the drilling and completion technology.The complex formations and drilling technical difficulties encountered during the drilling process are also summarized and analyzed with specific solutions put forward for different drilling difficulties.The solutions mainly include improving drilling and coring tools,adopts wire‑line coreing tool that does not lift the drill to replace the inner drill bit with a spring core protector cord.Micro‑foam drilling fluid and a drilling fluid formula of bentonite+lignite resin+broad‑spectrum wall protectant type III+high temperatureand salt resistance fluid loss agent+limestone powder are used.Developing the relevant management measures.As a result,drilling efficiency has been improved,drilling quality has met the geological requirements,and the drilling tasks have been effectively completed.It is desired the drilling experiences can provide technical reference for drilling of similar shale gas survey boreholes.
作者
韩毅
张绍和
王文彬
曹函
刘飚
肖金成
HAN Yi;ZHANG Shaohe;WANG Wenbin;CAO Han;LIU Biao;XIAO Jincheng(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education,Changsha Hunan 410083,China;School of Geosciences and Info‑Physics,Central South University,Changsha Hunan 410083,China;The Coal Geological Exploration Institute of Hunan Province,Changsha Hunan 410014,China;Hunan Geological New Energy Exploration and Development Engine)
出处
《钻探工程》
2021年第7期20-25,共6页
Drilling Engineering
基金
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)。
关键词
钻探
页岩气调查井
复杂地层
绳索取心钻具
不提钻换内钻头
钻井液
drilling technology
shale gas survey borehole
complex formation
wire‑line coreing tool
retrievable drill bit
drilling fluid
作者简介
韩毅,男,汉族,1995年生,在读硕士研究生,地质工程专业,研究方向为地质工程,湖南省长沙市岳麓区中南大学本部,13088321665@163.com;通信作者:张绍和,男,汉族,1967年生,教授、博士生导师,探矿工程专业,研究方向为钻掘工程,湖南省长沙市岳麓区中南大学本部,zhangsh@csu.edu.cn。
