Experimental Study on Rock Fragmentation Efficiency of Two Stage PDC Bit
Science Discovery
Volume 7, Issue 2, April 2019, Pages: 92-97
Received: Apr. 8, 2019; Published: May 23, 2019
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Authors
Wang Bin, School of Petroleum Engineering, China University of Petroleum, Qingdao, China
Guan Zhichuan, School of Petroleum Engineering, China University of Petroleum, Qingdao, China
Hu Huaigang, School of Petroleum Engineering, China University of Petroleum, Qingdao, China
Pan Rui, School of Petroleum Engineering, China University of Petroleum, Qingdao, China
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Abstract
This paper proposes a two-stage PDC bit that can actively release the formation pressure in advance to improve the rock breaking efficiency, and provides a new solution for effectively improving the rock breaking efficiency of the deep hard formation. The red sandstone drilling comparison experiment under the same drilling parameters of the two-stage PDC bit and the conventional PDC bit is carried out. The experimental results show that the two-stage PDC bit can effectively improve the rock breaking efficiency under the same conditions and compare with the conventional PDC bit. The speed increase efficiency can be up to 90%; the use of two-stage drill can greatly reduce the rock breaking torque during the drilling process. Under the same working conditions, the double-stage PDC bit can reduce the rock breaking torque by up to 30%, and the two-stage The mechanical specific energy of the drill bit is generally lower than the mechanical specific energy of the conventional drill bit, and the relative reduction of the mechanical specific energy under the same conditions is between 5% and 25%. And effectively reduce the ineffective vibration of the drill bit, thereby achieving the purpose of protecting the drill bit and increasing the life of the combination of the drill bit and the bottom drill.
Keywords
The Two Stage PDC Bit, Rate of Penetration, Rock Breaking Torque, Mechanical Specific Energy, Bit Vibration
To cite this article
Wang Bin, Guan Zhichuan, Hu Huaigang, Pan Rui, Experimental Study on Rock Fragmentation Efficiency of Two Stage PDC Bit, Science Discovery. Vol. 7, No. 2, 2019, pp. 92-97. doi: 10.11648/j.sd.20190702.17
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