全孔水力反循环PDC钻头理论设计研究
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摘要
结合单管反循环钻进的优缺点,改进设计了一种适用于漏失地层连续反循环取心钻进PDC取心钻头,通过对钻头分流水眼的分流计算,既保证了钻头能及时冷却,又能保证岩心的顺利返出;计算了钻杆的沿程损失及钻进中所需最小泵量,为现场施工泵量的选择提供了理论依据。
The PDC coring drill bit, which is suitable to continuous reverse circulation coring drilling in leaky or permeable formations, has been optimized according to the advantages and disadvantage of reverse circulation drilling with single tube. In order to ensure the cooling of drill bit and the smooth discharge of cores, the flow in bypass nozzle of a drill bit was calculated with shunt current. In addition, the linear loss of drill tube and the required minimum flow rate in drilling process are also calculated, which provides a theoretical support on the determination of on-site flow rate.
The PDC coring drill bit, which is suitable to continuous reverse circulation coring drilling in leaky or permeable formations, has been optimized according to the advantages and disadvantage of reverse circulation drilling with single tube. In order to ensure the cooling of drill bit and the smooth discharge of cores, the flow in bypass nozzle of a drill bit was calculated with shunt current. In addition, the linear loss of drill tube and the required minimum flow rate in drilling process are also calculated, which provides a theoretical support on the determination of on-site flow rate.
引文
[1]张志鹏.底板巷穿层孔预抽瓦斯区域防突技术研究[D].焦作:河南理工大学,2011.
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[7]吴晶晶,张绍和,施莉.小口径水力双循环双壁钻具设计与应用[J].中南大学学报(自然科学版),2014,45(1):186-192.
[2]徐彬,张军,刘宏进,等.保护层上风巷穿层钻孔抽采被保护层卸压瓦斯的试验研究[J].矿业安全与环保,2007,34(3):5-8.
[3]邓国祥.坑道水力取心金刚石水平钻进中的几个问题及对策[J].江西铜业工程,1997(1):65-66.
[4]朱立明,柯葵.流体力学[M].上海:同济大学出版社,2009.
[5]赵尔信,徐省盘,赵喜树,等.反循环连续取心钻头的设计和使用[J].探矿工程,1992,14(2):92-96.
[6]施莉.坑道钻探水力双循环双壁钻具设计[D].长沙:中南大学,2012.
[7]吴晶晶,张绍和,施莉.小口径水力双循环双壁钻具设计与应用[J].中南大学学报(自然科学版),2014,45(1):186-192.