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Technical Paper: Conical Diamond Element Bit Sets New Performance Benchmarks Drilling Extremely Hard Carbonate/Chert Formations/ Perm Region Russia

Society: IADC
Paper Number: 173144
Presentation Date: 2015
 Download: Conical Diamond Element Bit Sets New Performance Benchmarks Drilling Extremely Hard Carbonate/Chert Formations/ Perm Region Russia (4.75 MB PDF) Login | Register

 

Abstract

Developing reserves in the northern portion of Russia's Perm region frequently requires the operator to drill extremely hard carbonates with contain high concentrations of problematic chert inclusions. Drilling the chert with PDC bits has been challenging and in many cases impossible due to the cutter's inability to withstand high impact forces which resulted in severe cutter damage. Bot rotary and motor BHAs have been utilized in an attempt to mitigate shock and vibration.

Rollercone TCI bits are a viable option but slow ROP and short runs combined with high total bit revolutions caused numerous trips for tool change out. IT was evident that PDC's shearing action was the most efficient rock failure mechanism and had the greatest potential to drill extended meters at high higher ROP compared to a roller cone's crushing action. The operator required a new type PDC bit that could efficiently drill long intervals of carbonate/chert formations at high ROP and cutting structure that would remain intact when encountering the chert intervals.

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