Key Drilling Completion Techniques for Shale Gas Horizontal Wells in Pengshui Block
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摘要: 页岩气作为一种新兴的油气资源已越来越受到重视,国外页岩气勘探开发经验表明,水平井是页岩气藏成功开发的关键之一,但国内勘探开发工作及关键技术研究还处于起步阶段,存在钻速低、周期长、成本高及钻井中易发生井漏等问题。结合彭水区块4口页岩气水平井的钻井实践,从地层压力、地层岩性、岩石可钻性、页岩坍塌机理及页岩气固井特殊要求等方面入手,详细分析了气体钻井、旋转导向钻井、井眼轨迹控制、防漏堵漏、钻井液优选、水泥浆体系优选、井身结构优化、钻头优选、井眼净化等关键技术及现场应用效果,并围绕页岩气钻井提速、降低成本提出了一些建议。Abstract: Shale gas,a new kind of emerging resource,has drawn more and more attention recently.The successful experiences of exploration and development for shale gas in some foreign countries show that the horizontal well is the key for successful shale gas development.However,shale gas exploration and development and related key technique research in China are still at the primary stage.Engineering difficulties in shale gas well drilling face low penetration rate,long drilling cycle,high cost and possible circulation loss.Based on the drilling practice of 4 shale gas wells in Pengshui Block,an in-depth research on formation pressure,lithology,drillability,shale caving mechanism and special requirements for cementing was made and then key techniques including air drilling,rotary steering drilling,well trajectory control,leakage prevention and sealing,drilling fluid selection, cement slurry optimization,well structure optimization,drilling bit selection,wellbore cleaning,as well as their effectiveness were analyzed.Finally some recommendations on how to increase penetration rate and to lower cost were put forward.This article might be instructive for the development of shale gas with similar geologic and reservoir conditions.
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Keywords:
- shale gas /
- horizontal well /
- drilling /
- well cementing /
- Pengshui Block
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