Oscillation impacter improves the rate of penetration
by Dawei Qin; Jiyou Xiong; Guohua Wang; Xuecheng Dong
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 21, No. 2, 2019

Abstract: In order to improve the rate of penetration and drilling performance, a tool named oscillation impacter is designed, which enables hydraulic energy to transform into mechanic one and generate static-and-dynamic loading on the bit and local instantaneous low pressure at the bottom. This paper attempts to analyse the structure and working principle of oscillation impacter, study the rock breaking mechanism of local instantaneous low pressure through theoretical analysis and the rock breaking mechanism of static-and-dynamic loading by the method of numerical simulation. Reasonable working parameters are recommended after analysing the influence that frequency and the maximum amplitude of dynamic loading act on rock breaking. According to the simulation results, corresponding drilling technology is established and field tests are conducted in Huabei oilfield. The statistical results manifest that the performance of oscillation impacter is favourable in different formations and the ROP is improved significantly. [Received: July 6, 2015; Accepted: January 6, 2017]

Online publication date: Tue, 14-May-2019

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