雄安新区D05井燧石白云岩地层钻头应用探索

Exploration of drill bit applied in chert dolomite strata in Well D05 of Xiong’an New Area

摘要:

D05井是雄安新区一眼地热勘探井，完钻井深4014.42 m，揭露了雾迷山组和高于庄组两个热储层。在高于庄组石英含量较高的燧石白云岩地层钻进中，出现了钻头严重磨损、钻头使用寿命短的状况。为解决钻探施工中的难题，进行了钻头应用探索，通过分析研究、实践应用优化，探索出了一种适宜于石英含量较高的燧石白云岩地层?215.9 mm井径使用的牙轮钻头，平衡了钻头磨损和钻进效率方面的难题。使用该型号钻头顺利地完成了D05井三开?215.9 mm孔径钻探施工任务。通过本次钻头应用探索，为类似地层钻头应用提供了参考方案，丰富了深部地热钻探工艺技术，为深部地热钻探的发展提供了技术支撑。

Abstract:

Well D05 is a geothermal exploration well in Xiong’an New Area with the total depth of 4014.42 m， and two thermal reservoirs were revealed named Wumishan Formation and Gaoyuzhuang Formation. The situation of serious wear and short service life of bit appeared when drilling in the quartz-rich chert dolomite strata in Gaoyuzhuang Formation. Therefore， the exploration of drill bit was made through the analytical study and practice optimization. As a result， a kind of cone bit suitable for ?215.9mm well diameter in quartz-rich chert dolomite strata was explored， and the problem of bit wear and drilling efficiency were balanced. The drilling task of ?215.9mm well diameter in the third spud of Well D05 was completed smoothly by the use of this bit. The successful application provides a reference scheme for bit usage in similar strata， enriches the deep geothermal drilling technology and provides technical support for the development of deep geothermal drilling.