![]() The sidetrack is of two types, one is cased hole side track where the casing need to be cut and other is open hole sidetrack where a new hole is created in the drillable formation. The fish of 10m length lied at the bottom and the cement plug was placed for side track. The client drilled the well till 2873m where they fished the drill assembly in 8.5’’ section. The reason to use tricone was because of the stability it provides downhole while doing the side track. The drill bit selected to run with the assembly was tricone insert bit. The test to check the motor on surface was called as SHT (Shallow hole test) where we pumped designated gallon per minutes (gpm) of mud through the mud motor in order to check its vibration and pressure holding capacity. The LSS (lower sleeve stabilizer) had been placed on the bottom sleeve part of the mud motor. This bend is basically aligned with the Measurement while drilling tool which turn send signals through its pulses from bottom of hole to surface equipment. The purpose of the bend was to keep the bottom part of the bottom hole assembly with angled from vertical so it helps in generating a new hole when went down hole. On the surface, then pick up the mud motor on the rig floor, DD set the bent housing of mud motor and orient it at the bend of 1.72deg which was selected from 0-3deg chart. This helps in generating more torque, as well increase the revolution per minute of drill bit and in the present case of Sidetrack, we want only the drill bit to rotate instead of the whole drill string from surface. ![]() ![]() The main purpose of the positive displacement drilling motors is to generate mechanical energy from the hydraulic energy of the drilling fluids and converge that energy to the drive shaft connected with drill bit.
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