大直径定向长钻孔用PDC钻头设计与应用
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摘要
针对煤矿井下中硬地层钻进中采用的常规单齿式PDC定向钻头和常规型扩孔钻头钻进寿命短,效率低,以及常规扩孔钻头在扩孔钻进中难以沿原孔轨迹钻进的缺陷,结合大直径定向长钻孔对三种钻头的需求,研制了两种新型PDC钻头,其中新型PDC定向钻头采用刮刀型平底结构并优化布齿,增加了切削齿数量,扩孔钻头采用圆弧形剖面,并沿切削剖面布齿,增大了切削自由面。针对两种钻头进行了现场应用,现场应用证明,新型PDC定向钻头受控性好,钻进稳定,在中硬地层钻进效率和寿命显著提高,是普通单齿式钻头的2倍,新型扩孔钻头能够沿先导孔轨迹扩孔钻进,钻头寿命是普通扩孔钻头的3倍以上。
Aiming at the short life and low efficiency of conventional single-tooth PDC directional drill bits and conventional reamer bits used in the drilling of medium-hard strata in coal mines,the difficulty for conventional reamer drill bits to drill along the original trajectory,as well as the demands for the three kinds of drill bits in the directional long drilling hole,two new PDC bits are developed. The PDC directional drill bit are designed with scraper flat structure,the cutting teeth arrangement is optimized,the reaming drill bit is of circular arc profile,and the cutting teeth is arranged along the bit profile,on-site application of the PDC bits is carried out. Field application shows that, the new PDC directional drill bit control is favorable with stable drilling performance. In the mid-hard ground,the drilling efficiency is significantly improved,and the bit life is 2 times of the ordinary single-tooth drill bit,the new reaming drill can be drilled through the pilot hole trajectory,drill life is more than 3 times of the normal reaming drill bit.
Aiming at the short life and low efficiency of conventional single-tooth PDC directional drill bits and conventional reamer bits used in the drilling of medium-hard strata in coal mines,the difficulty for conventional reamer drill bits to drill along the original trajectory,as well as the demands for the three kinds of drill bits in the directional long drilling hole,two new PDC bits are developed. The PDC directional drill bit are designed with scraper flat structure,the cutting teeth arrangement is optimized,the reaming drill bit is of circular arc profile,and the cutting teeth is arranged along the bit profile,on-site application of the PDC bits is carried out. Field application shows that, the new PDC directional drill bit control is favorable with stable drilling performance. In the mid-hard ground,the drilling efficiency is significantly improved,and the bit life is 2 times of the ordinary single-tooth drill bit,the new reaming drill can be drilled through the pilot hole trajectory,drill life is more than 3 times of the normal reaming drill bit.
引文
[1]姚宁平,张杰.煤矿井下定向钻孔轨迹设计与控制技术[J].煤炭科学技术,2013(3):7-8.
[2]刁文庆,唐大勇.定向钻进用胎体式PDC钻头烧结工艺研究[J].煤炭科学技术,2013(3):21-23.
[3]孙荣军,石智军,李锁智.煤矿井下定向钻进配套钻头的选型与使用[J].煤田地质与勘探,2014(2):83-86
[4]许超,石智军.煤矿井下定向钻进钻孔事故的预防及处理[J].煤田地质与勘探,2014(6):101-104.
[5]郭东琼.煤矿井下随钻测量定向钻进用PDC钻头的研制[J].金刚石与磨料磨具工程,2011(3):31-33.
[6]罗恒荣,邹德永,曹继飞.导向PDC钻头设计及其在临盘地区的应用[J].石油钻探技术,2011(9):101-105.
[7]刘刚.煤矿井下定向钻进用刮刀型PDC钻头的研制与应用[J].煤炭工程,2015,47(9):135-136.
[8]刘刚,李锁智.煤矿井下定向长钻孔用新型PDC扩孔钻头的研制及应用[J].煤矿机械,2015(10):218-220.
[2]刁文庆,唐大勇.定向钻进用胎体式PDC钻头烧结工艺研究[J].煤炭科学技术,2013(3):21-23.
[3]孙荣军,石智军,李锁智.煤矿井下定向钻进配套钻头的选型与使用[J].煤田地质与勘探,2014(2):83-86
[4]许超,石智军.煤矿井下定向钻进钻孔事故的预防及处理[J].煤田地质与勘探,2014(6):101-104.
[5]郭东琼.煤矿井下随钻测量定向钻进用PDC钻头的研制[J].金刚石与磨料磨具工程,2011(3):31-33.
[6]罗恒荣,邹德永,曹继飞.导向PDC钻头设计及其在临盘地区的应用[J].石油钻探技术,2011(9):101-105.
[7]刘刚.煤矿井下定向钻进用刮刀型PDC钻头的研制与应用[J].煤炭工程,2015,47(9):135-136.
[8]刘刚,李锁智.煤矿井下定向长钻孔用新型PDC扩孔钻头的研制及应用[J].煤矿机械,2015(10):218-220.