Drilling

K Ramar E.E.

1) Holding Force (Pressure)2) Relative Motion3) Debris Removal

C.F.P Cell designed to measure• Weight on Bit (WOB)• Speed of rotation (RPM)• Rate of Penetration (ROP)• Temperature raise of cutting tool

Courtesy: Compagnie Francaise des Petroles (C.F.P.), France: Forability cell (1977-79)

h = depth of cutVf = feed rateVs = cutting speedC = Surface concentration of cutting edgesw = width of cutting edge

1) Holding Force (Pressure)2) Relative Motion3) Debris Removal

CORE BARREL

DOUBLE TUBE CORE BARREL

WIRE LINE CORE BARREL

CORE DRILLING ARRANGEMENT

STANDARD PENETRATION TEST

Hammer weight: 65 kgDrop height: 760mmSampling tube length: 300mm

Mud Drilling

PUMPS

• Rotodynamic Pump

• Positive displacement Pump

Cutting Fluids:

• Clear water

• Mud

• Polymers

Burnt BitCauses: lack of cutting fluid,

excessive WOB

Surface set bit

FISHING

Fishing with wall-hook and knuckle joint in cavity

Lead impression blocks

Recovery Taps