This document discusses well intervention techniques using coiled tubing. It describes coiled tubing as continuously-milled tubular product that is straightened before insertion into the wellbore. The main types of well intervention discussed are pumping, slickline, snubbing, workover, and coiled tubing. It provides details on the components and functions of a coiled tubing unit, including the reel, injector head, control cabin, power pack, blowout preventer, stripper, and bottom hole assembly.

1. Prepared By: Touseef ur Rehman
Petroleum & Gas Engineer

2. Any operation carried out on a well during or at the end of its productive
life, which alters the state of the well and/or well geometry, provides well
diagnostics, or manages the production of the well.

3. Types of well Intervention?
Pumping
Slick line
Snubbing
Work over
 Coiled tubing
Wire line

4. What is Coiled Tubing?
“Continuously-milled tubular product that is
straightened prior to being inserted into the wellbore
and is recoiled for spooling back on to the reel.”

5. Application of Coiled Tubing?
 Mechanical
 Cementing
 Fishing
 Perforating
 Logging
 Scale removal (mechanical)
 Cutting tubular (mechanical)
 Running a completions
 straddles for zonal isolation
 Drilling
 Setting a plug or packer
 Work over (Pumping)
 Removing sand or fill from a
wellbore
 Fracturing/acidizing a formation
 Unloading a well with nitrogen
 Gravel packing
 Cutting tubular with fluid
 Pumping slurry plugs
 Zone isolation (to control flow
profiles
 Scale removal (hydraulic)
 Removal of wax
 Hydrocarbon or hydrate plugs

6. The unit consists of five basic elements:
 Reel
 Injector Head
 Control Cabin
 Power Pack
 BOP
Coiled Tubing Unit:
The coiled tubing unit is comprised of the complete set of equipment
necessary to perform standard continuous-length tubing operations in
the field.

7. Reel:
❑ For storage and transport of the CT

8. Reel Consists of
Reel drum
Reel drive and brake system
Level wind assembly
Depth counter
Lubrication system
Reel swivel and manifold

9. Injector Head
 To provide the surface drive force
to run and retrieve the CT
 The equipment that performs
these operations is grouped into the
following systems:
1- Drive and brake system
2- Chain assembly
3- Traction and tension system
4- Guide arch system.

10. Control Cabin
 From Which The Equipment
Operator Monitors And controls
the CT
 Control console
components(Reel, Injector,
Bop, Strippers)
 Control console functional
areas
well control
drive chain traction and tension
injector motion and direction
reel motion and direction
engine remote control
system monitoring.
Instrument scanning

11. Power Pack
o Prime mover is usually an
engine
o Provides hydraulic &
pneumatic power
through a system of
pumps, valves, and lines
to operate the CTU.
Hydraulic control
System
Hydraulic circuits
Engine control panel
Hydraulic control
panel
Pneumatic system

12. Stripper
The stripper provides
the primary operational
seal between pressurized
wellbore fluids and the
surface environment
❑ It is physically
located between the
BOP and the injector
head.
❑ The stripper provides
a dynamic seal
around the CT
during tripping and a
static seal around the
CT when there is no
movement.

13. Retainer and clip pins
Split cap and upper bushing
Non extrusion ring
Packing
inserts
Energizer
Lower bushing
interchangeable
Interlocking stripper inserts
Conventional assembly

14. Blowout preventer
The BOP is used to contain wellbore pressure. A CT BOP is
designed specifically for CT operations
Blind ram - seals the wellbore when the
CT is out of the BOP
Shear ram - used to cut the CT
Slip ram - supports the CT weight hanging
below it
Pipe ram - seals around the hanging CT
The four BOP rams, from top to bottom and their associated
functions are:

15. BOP
Stripper
flange
Blind Ram
Shear Ram
Slip Ram
Pipe Ram

16. Bottom Hole Assembly (BHA):
Coiled Tubing BHA includes:
 Connectors
Check Valves
Disconnects
Circulation valve
Nozzles
Quick Connects.

17. Connecter
The main function of a connector
is to attach the CT string to
various down hole tools. It must
mechanically hold and seal on the
CT string and provide a
threaded connection to connect
down hole tools below it

18. Check valves
 The function of a check valve is to
prevent wellbore fluids from
entering the CT string, while
allowing fluid pumped through the
CT string to enter the wellbore.

19. Disconnect tools
 A disconnect in a CT BHA
provides a means of releasing
from the lower BHA in a
controlled manner

20. Circulation valve
 A circulation valve in a CT BHA
provides a means of opening
circulation ports in a controlled
manner. Circulation ports can be
used to provide additional flow
area (and therefore allow higher
pump rates) in many types of
applications

21. Quick connects
 A quick connect is a tool designed to assist
with making up tool strings, where it is
difficult to rotate the tools to engage the
threads.

22. Centralizers
Centralizers are fitted to or are included in a
CT tool string to help keep the tool or nozzle
away from the tubular wall; that is, the