The second presentation of a series of presentations on Operations Geology. Very basic, just to introduce beginners to operations geology. I hope the end users will find this and the following presentations very helpful.

1. OPERATIONS GEOLOGY
PRESENTATIONS
Presentation 2:
Drilling Rig Systems
30 September2016Ali Trichelli

2.  Drilling rigs, whether onshore or offshore, are composed of five major drilling rig
systems:
 Power System
 Circulation System
 Rotary System
 Hoisting System
 Well Control System
Introduction

3. Power System
 The power system provides electrical power to the entire drilling rig
 Electrical power is generated from the combustion generators
 The combustion generators are fueled by diesel
 The other Power system components are:
 Diesel fuel tanks where the diesel is stored
 Alternators which supply AC power to the mud motors
 Transformers which are responsible for reducing the voltage of the current
 Control panel which is a device that monitors the distribution of power to the rig
equipment
Generator Alternator Transformer Control Panel

4. Circulation System
 The Circulation system circulates the mud during the drilling operation in
order to:
 Transport cuttings to surface
 Clean the bore hole
 Cool the bit and the drill string
 Support the wellbore & balance the formation pressure
 Provide hydraulic power to the bit & drive the down hole motor

5. Major Components of the Circulation System
 The major components of the circulating system are:
 Mixing equipment: a hopper, a mud gun and
agitators to mix chemicals, fluids and solids to
prepare the drilling mud
 Mud pits: a series of interconnected steel tanks
to store mud & equipped with agitators to
maintain the density of the drilling mud
 Mud cleaners: Shale shakers, sand traps,
degasser, desander, desilter, mud cleaner
centrifuge and cutting dryer used to separate
drilling mud from rock cuttings, solids & fluids
 Mud pumps designed to circulate drilling fluid
down the drill string and back up the annulus

6. Rotary System
 There are two types of Rotary systems:
 The Lower Rotary System (the Kelly Drive
Bushing):
The rotary table rotates the Kelly and through it
the drill string and bit
 The top Drive Rotary System:
The rotation of the drill string is accomplished by
a drive motor located below or attached to the
swivel
The kelly and kelly bushing are not required
Stands of drill pipe (3 joints) are drilled instead
of single joints

7. Rotary System
TOP
DRIVE
Master Bushing
Master Bushing
Holes for
drive pirs of
kelly bushing

8. Hoisting System
 To lift & lower the drill pipe and casing during the drilling process.
 The major components of the hoisting system are:
 The derrick: Provides height for drill pipe vertical movement
 The crown block & the travelling block: Responsible for the vertical movement of the pipe
 The drawworks: Supports the lifting activities & the replacement of the drilling line
 The substructure: Provides height for the BOP (Blow out Preventer) stack & space for
pipe set back & drilling crew

9. Hoisting System- Major Components
Derrick
Crown Block
Travelling Block
Drawwork
Substructure

10. Well Control System
 Controls the movement of fluids in & out of the well bore
 Prevents undesired fluid release from the well (well kicks)
 The major components of the well control system are:
 Wellhead: suspends the casing & tubing string, contains & isolates the pressure of the tubular
strings; provides interface with the BOP, X-mas tree & the tie back
 BOP: Located on top of the well and can be closed if formation fluid control is lost
 Christmas Tree: A series of valves that control the fluid flow and helps shut-in the well if needed

11. Well Control System- Major Components
BOP’sWellhead X-mas Tree

12. NEXT PRESENTATION
 Drilling Bits
 Bit Types
 Bit Classification
 Bit Grading