Application of Gyro Shock-damping Tool combining with PDC bit in granite buried hill formation in Chad

3rd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Shi, Libao^1 ; Zhang, Xiaoning^1 ; H., Nie ; Y., Zhang ; Z., He ; L., Kong

Research Institute of Petroleum Exploration and Development, Beijing, China^1

关键词: Granite formation;    Hard formation;    Main parameters;    Parabolic profiles;    Shock damping;    Stick-slip vibration;    Tri-cone bit;    While drillings;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/300/2/022028/pdf
DOI  :  10.1088/1755-1315/300/2/022028

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Stick-slip vibration is likely to occur while drilling in hard formation and soft-hard interbedded formation, especially when PDC bit is used, which further results in lower ROP and short footage. In this study, Gyro Shock-damping Tool and optimization PDC bit design were tested to reduce the stick-slip vibration and lengthen bit life while drilling in granite buried hill formation. Main parameters of the PDC bit include: 8 blades, short parabolic profile, Trident IV PDC, 10mm, 13mm cutter, totally 90 cutters, back rake of 19 -23 , double row of cutter (back row is impregnated string, with the height difference of 0.5mm). Gyro Shock-damping Tool combined with customized PDC bit was tested in 630-869m granite formation of a well in Chad, 239m footage was done in 54hrs, with a ROP of 4.44m/hr. In comparison, in an adjacent well, only 11m footage was completed with 3 PDC bits at the ROP of less than 1.23m/hr. Compared with some other adjacent wells drilled by 43 tri-cone bits, the specially designed bit increased by 97.33% in ROP and 54.19% in footage on average. All these prove that the technology outperforms the other bits, and can be used widely in granite buried hill horizontal well, hard formations and hard -soft interbedded formations.