Drilling by reverse rotary method of drilling using 9 7/8” dia.bit for pilot bore follwed by subsequently reaming using 12 1/4” dia. ,15 "" dia. and 17.5"" dia. rock roller bits/ drag bits in consolidated, semi consolidated and soft formation up to required depth including casing boring and casing lowering as required including cost of fuels and lubricants etc. as required for drilling. "
Drilling by reverse rotary method of drilling using 9 7/8” dia.bit for pilot bore follwed by subsequently reaming using 12 1/4” dia. ,15 "" dia. and 17.5"" dia. rock roller bits/ drag bits in consolidated, semi consolidated and soft formation up to required depth including casing boring and casing
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