长宁页岩气小井眼水平井钻井技术分析及发展探讨  

Slimhole horizontal-well drilling technology for Changning shale-gas block and its prospect

作　　者：代锋 孙钰淇 付利 雷正义[3] 刘力 衡德 陈正桥 DAI Feng;SUN Yuqi;FU Li;LEI Zhengyi;LIU Li;HENG De;CHEN Zhengqiao(Sichuan Changning Gas Development Co.,Ltd.,Chengdu,Sichuan 610000,China;CNPC Engineering Technology R&D Company Limited,Beijing 102206,China;Development Division,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China;Sichuan Huashuntong Energy Technology Development Co.,Ltd.,Chengdu,Sichuan 610000,China)

机构地区：[1]四川长宁天然气开发有限责任公司 [2]中国石油集团工程技术研究院有限公司 [3]中国石油西南油气田公司开发事业部 [4]四川华顺通能源技术开发有限公司

出　　处：《天然气勘探与开发》2023年第2期118-126,共9页Natural Gas Exploration and Development

基　　金：四川长宁天然气开发有限责任公司科学研究与技术开发项目“长宁区块长水平段小井眼钻井技术研究”(编号:20210401-10)。

摘　　要：页岩油气资源的规模效益开发是我国能源安全的重要保障,创新页岩气开发工艺方法是降本增效的主要途径。小井眼水平井钻井技术具有机械钻速高、钻井周期短、成本低、安全可靠等优点,具有良好的应用前景,受到越来越多的关注与重视,特别是适配小井眼水平井钻井工具及工艺的大力研发,极大推动了小井眼水平井技术的发展。通过回顾小井眼技术的发展概况,分析了国内外小井眼水平井的技术现状,阐释了环空水力学、携岩效率、配套工艺工具等小井眼水平井关键技术研究;开展了长宁气区小井眼水平井钻井方案可行性分析,优化了小井眼水平井井身结构、长水平段钻井液性能、固井下套管工艺等工程设计,优选配套提速工具,强化钻井参数;初步测算了钻井液材料、岩屑处置、固井材料等消耗成本。研究结果表明,小井眼水平井单井成本可节约150万~200万元,极大降低了工程成本,实现钻井提质增效。The extensive and beneficial development of shale-oil and shale-gas resources is the important guarantee for China’s energy security,and innovative development methods for shale gas are the main way to reduce costs and increase efficiency.One technology of slimhole horizontal-well drilling boasts high rate of penetration(ROP),short drilling cycle,low cost,safety and reliability.It has a bright future achieving more and more attention.Particularly,the vigorous R&D of slimhole horizontal-well drilling tools and processes greatly promote this technological development.So,the development was reviewed,the current status was analyzed for the slimhole horizontal-well technology around the world,in particular some key technological points,like annular hydraulics,cuttings-carrying efficiency,and supporting processes and tools.Furthermore,a feasibility analysis was conducted on its drilling scheme for Changning gas block.A few engineering designs were optimized for slimhole horizontal wells,including casing program,performance of drilling fluid in long horizontal interval,and casing-running processes for cementing.Supporting tools were optimally selected for ROP increase,and drilling parameters were mended.On top of that,consumption costs on drilling-fluid material,cutting disposal and cementing substance were primarily measured and calculated.Results shows that single-well costs in the slimhole horizontal wells can be reduced by 1.5 million to 2 million yuan,which helps tremendously reduce engineering costs as well as improve drilling efficiency and performance.

关 键 词：长宁地区 页岩气 小井眼 水平井 钻井技术 井身结构优化 单井成本 提质增效 

分 类 号：TE243[石油与天然气工程—油气井工程]