彭齐, 周英操, 周波, 刘川福, 刘宇. 凸脊型非平面齿PDC钻头的研制与现场试验[J]. 石油钻探技术, 2020, 48(2): 49-55. DOI: 10.11911/syztjs.2020035
引用本文: 彭齐, 周英操, 周波, 刘川福, 刘宇. 凸脊型非平面齿PDC钻头的研制与现场试验[J]. 石油钻探技术, 2020, 48(2): 49-55. DOI: 10.11911/syztjs.2020035
PENG Qi, ZHOU Yingcao, ZHOU Bo, LIU Chuanfu, LIU Yu. Development and Field Test of a Non-Planar Cutter PDC Bit with Convex Ridges[J]. Petroleum Drilling Techniques, 2020, 48(2): 49-55. DOI: 10.11911/syztjs.2020035
Citation: PENG Qi, ZHOU Yingcao, ZHOU Bo, LIU Chuanfu, LIU Yu. Development and Field Test of a Non-Planar Cutter PDC Bit with Convex Ridges[J]. Petroleum Drilling Techniques, 2020, 48(2): 49-55. DOI: 10.11911/syztjs.2020035

凸脊型非平面齿PDC钻头的研制与现场试验

Development and Field Test of a Non-Planar Cutter PDC Bit with Convex Ridges

  • 摘要: 常规PDC钻头在钻进塔里木油田库车山前巨厚砾石层时存在破岩效率低、机械钻速慢和钻井周期长等问题,分析认为,砾石对常规PDC钻头的平面齿产生较大冲击力导致切削齿崩齿或严重磨损是钻速低的主要原因。为此,设计了一种凸脊型非平面齿,并研制了配套PDC钻头,将钻头破岩方式由常规PDC钻头的面切削转变为线压裂和面挤压,大大提高了钻头破岩效率。室内试验表明,凸脊型非平面齿具有良好的抗冲击性能与抗研磨性能,抗冲击性能是平面齿的10倍以上。2只凸脊型非平面齿PDC钻头在库车山前地区博孜区块某井砾石层井段进行了现场试验,创造了机械钻速最高、单只钻头进尺最长的区块纪录,与邻井常规PDC钻头相比,进尺提高1.5倍以上,平均机械钻速提高64%以上,提速效果明显。研究与试验表明,凸脊型非平面齿PDC钻头能够较好地满足库车山前巨厚砾石层高效钻进的要求,可为库车山前深层天然气的高效勘探开发提供了技术支持。

     

    Abstract: When conventional PDC bits are used to drill into the massive gravel layer at the Kuqa Piedmont, challenges such as low rock breaking efficiency, low ROP and long drilling cycle are encountered. A deeper analysis concluded that the large impact of gravels on the planar tooth of conventional PDC bits, as well as the further tooth breakage or severe wear are the main reasons of low penetration rate. Therefore, a convex ridge non-planar cutter was designed, and the matched PDC bit was developed to transform the traditional face cutting into linear fracturing and face crushing methods, which greatly improves the rock breaking efficiency of bit. The lab tests suggest that the convex ridge non-planar cutter had good impact resistance and anti-abrasive performance, and the impact resistance was 10 times that of the planar tooth. Two convex ridge non-planar tooth PDC bits have been tested in the gravel interval of a well in the Bozi Block, creating a record of the highest ROP and the longest single bit footage in this block. Compared with the conventional PDC bits in adjacent wells, the footage was increased by more than 1.5 times, and the average ROP increased over 64%, with obvious effect of raising the penetration rate. Research and tests indicated that the ridge non-planar cutter PDC bit could meet the requirements of drilling in the massive gravel layer of Kuqa Piedmont effectively, and provide technical supports for the efficient exploration & development of deep natural gas in this area.

     

/

返回文章
返回