DRILLING: It is defined as art & science of making a
hole in an object.
OIL & GAS WELL DRILLING: It is an art & science
of drilling a hole in the earth crust down to a desired
depth in search / extraction of natural gas or
When science is used for the benefit of
mankind, it may take any other shape.
Two such forms are
Engineering is the science of
machines. It is primarily connected with
analysis of mechanisms involved,
design, construction, operation and
maintenance of the machines.
So Drilling Engineering is the science
of machines which are involved in drilling a
petroleum well or simply a well.
It is basically the science of Methods .
When methods are standardized we call
them Techniques. When techniques are
used for commercial purpose, we call
So Drilling Technology is the science of
standard methods or techniques which are
used / employed for drilling an oil or gas
Oil well drilling engineering may easily be divided
into following drilling systems. A system is a sum or
group of various machines, equipments &
Mud Handling / Circulatory System
Well Control System
Generic word used in two ways:-
A plant / unit for drilling a hole in the ground.
A machinery system which is used to make a hole in
A system which is composed (made) of various
mechanical & electrical sub systems / equipments for
drilling a hole into the ground.
A tower type structure erected to make a hole / bore
in the ground.
Rig / Derrick floor
Diesel Engines, Alternators, Bus Bar, PCRS (SCR
unit), Cables, Motors, Switches, Regulators (for
MUD HANDLING SYSTEM
Super Charger, Mud Pumps, Pipes (HP line, stand
pipe & H manifold), Rotary Hose, Flow Nipple, Flow
Line, Shale Shaker, De Sander, De Silter , Mud
Cleaner, Mud Tanks and Agitators etc.
Draw Works, crown block, travelling block and
drilling line or casing line etc.
Swivel, Rotary Table, Kelly, Kelly bushing, Drill
Stem ( drill pipe, drill collar, stabilizers, different
substitute), Bit etc.
WELL CONTROL SYSTEM
Well Head, D / Spool, Spacer Spool, K / Line, C /
Line, Ram Bop, A / Bop, Gas Buster, Accumulator
Unit, Hydraulic Lines.
Measuring Instruments Pressure Gauges, SPM
Gauge, R.P.M Gauge, Torque Gauge, Weight
Indicator, MVT (Mud Volume Totalizer), Ton Mile
Indicator, Recorder, Cables, etc.
AC Lighting system, Air Supply / Pneumatic System
( Compressor, lines, Receiver), Water Supply System,
Tool Tackles, etc.
It is a science of standard methods or techniques which
are used / employed for drilling an oil or gas well.
Special (Directional, Complications, Fishing etc.)
Operations involved in drilling a well are :
Spudding-In of the Well
Drilling (1st, 2nd, 3rd Phase)
Well Head Fitting & Testing
BOP Fitting & Testing
Fishing & Complication Operation