This paper introduces the implementation of hydro-efflux hammer as an effective rate of penetration(ROP)enhancement tool.In the test well,the target formations are mainly composed of dolomite,limestone and carbonate with hard and abrasive characteristics.In addition,the carvings caused by the unstable shale formation in the upper section result in an increased mud weight,and associated drilling difficulties and low penetration rate.The conventional drilling techniques including mud motor have not been effective in this scenario.By implementing a 9-inch hydro-efflux hammer to drilling across the given formations,a significant ROP enhancement was observed.The deployment was planned based on quantitative analysis of formation characteristics,a study on the correlation between the tool's performance parameters and formation anti-drillability parameters,and the well design.The rotary percussion drilling parameters,bottomhole assembly(BHA)and bit selection are optimized through impact resistance and bit aggressiveness analysis.The result showed an ROP enhancement of over 47% compared with the offset average,providing an effective alternative for similar applications.
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