snubbing unit components.pptx sklcidjcsihchdc

Snubbing unit components
Well mentoring program
2009 / 2011
Phase 9: REVIEW
Presented by :
Belaid Laskri
Instructor:
Armando Ynostroza

Types of Snubbing Units:
• Mechanical Units
• Long Stroke Units
• Hydraulic Jack

 Hydraulic Jack Assembly
 Guide Tube
 Window
 Traveling Slips
 Stationary Slips
 Rotary Table
 Power Tongs
 Work Basket
 Counter Balance
 Control Panel
 Hydraulic Hoses
 Pumps, Kelly Hose, Circulating Swivel
 BOP Stack
Hydraulic Snubbing Unit Components

 Hydraulic Jack Assembly:
• The hydraulic jack assembly is a series of one or more
hydraulic cylinders that travel in an upward or downward
direction to move pipe out of, or into the hole
Hydraulic piston cylinder

 Guide Tube
• The function of the guide tube is to prevent pipe buckling. It is
placed in the bore of the jack and is attached below the
traveling slips. The guide tube travels up and down with the
traveling assembly to prevent lateral movement of the pipe.

 Window :
• The window is situated at the base of the jack below the
stationary slips and above the stripper.
• Its purpose is to provide an access to change out or install
tools with an OD too large for the guide tube.

 Window Guide :
• The window guide has an identical function to the guide tube.
It prevents major axis buckling of the string in the window.
 Traveling Slips
• Traveling slips or snubbers are located on the basket, and
move with the traveling assembly. These slips grip the pipe
and transmit force to lift the pipe from the hole, or to force it
down into the hole.

 Stationary Slips:
• Stationary slips are attached to the base of jack. They hold the
pipe when the traveling slips are not engaged.
Stationary Slips Closed
Position

 Rotary Table:
• If available, the rotary table is attached to the traveling
assembly.
• It gives the snubbing unit the ability to perform drilling and
milling duties.
• It is hydraulically powered and regulated.
 Power Tongs:
• Hydraulically powered tongs are used to make up or break out
connections on larger diameter pipe.
• They are rigged up in the basket.

 Work Basket:
• The workbasket or traveling basket is the work platform of the
snubbing unit.
• It is located on top of the hydraulic jacks.

 Counter Balance:
• The owner balance coupled with a telescoping gin pole are
controlled from the workbasket.
• Its primary function is to lift or lower pipe to the workbasket
or to the helpers at ground level.

 Control Panel:
• Typically controls are divided into two panels, one for the unit
operator and one for his helper. The operator controls
operate the slips and direction of the jack. The panel is
equipped with a weight indicator, which shows snub or lift
load on the jack.
• The helper usually controls movement of the counter balance
winch, which transports pipe to and from the basket.
• The helper also controls stripper rams, equalizing loop, pump
in line, vent line and safety rams.

 Control Panel:

 Power Pack & Accessories :
• The power pack consists of hydraulic pumps and a power
source, normally a diesel engine.
• It supplies hydraulic pressure for:
–Jack operation
–BOPs
–Rotary table
–Counter balance
–Power tongs
Power Pack

 Power Pack & Accessories :
• The main system pressure is used for the jack
• The Accumulator system must have sufficient volume and
pressure to function all BOPs at least one and a half times with
a minimum of 1200 psi still remaining in the accumulators.
Accumulator

 Circulating System :
• Pumps, kelly hose and circulating swivel make up the majority
of the circulating system components.
• Pumps are normally high pressure, low volume pumps.
• Pumps are rated to the highest anticipated circulating or
surface pressure for the job. Swivel
Pumping
system

 Stripper Rubber :
• The stripper rubber is normally located at the base of the jack
or under the window.
• It is a low pressure preventer used for running tubing in or out
of the hole without using the stripper rams.
• The stripper rubber may also be used as a wiper rubber to
prevent debris from falling into the hole.

 BOP Stack :
• Components of stack include:
 Rams
 Equalizing loop
 Vent line
 Spacer Spools
 Outlet Spools
 Choke and Kill Lines

 BOP Stack
• Rams:
The basic ram preventer is very versatile due to the different ram
block inserts that may be used, such as:
Bore size
Pressure rating
H2S trim
Number
Type

 BOP Stack
• Rams:
 Stripper Rams
Stripper rams are usually the two top rams on the snubbing
stack used to trip pipe under pressure. The packer insert
elements are specially designed to give better life for
stripping.

 BOP Stack
• Rams:
 Safety Rams
A safety ram is a normal pipe ram that is used as a backup or
to close and seal pressure when changing out the stripper
ram inserts.
 Blind Rams
Blind rams have no cutout on the ram block. They are
designed to close and seal on an open hole.
 Shear/Cutter Rams
Shear or cutter rams are designed to shear or cut the pipe in
the hole.

 BOP Stack
• Rams:
 Slip Rams
Slip rams have a slip type insert. The insert takes the place of
the sealing element so these rams will not seal pressure.
Slip rams are designed to hang the string and prevent it from
rotating.
 Variable Bore Rams
Variable bore rams are available to close on more than one
size of pipe without having to change out the rams.

 BOP Stack
• Rams:
 Equalizing Loop:
The equalizing loop is a high pressure piping circuit running
from below stripping ram #1 to below stripping ram #2.
Since rams are wellbore energized, to open ram #2 with
pressure below it, the pressure must be equalized on both
sides for it to open.
Manual and hydraulic valves run off both lines from the BOP.
These valves are normally low torque.
Additionally, a pump in line may be rigged up to use pump
pressure to equalize pressures between the stripper rams

 BOP Stack
• Rams:
 Vent Line:
Since stripper ram #1 may or may not open with pressure
underneath it, a bleed line or vent line below it, is used to
vent off pressure after stripper ram #2 is closed.
 Spacer Spools
Spacer spools provide necessary clearance between stripper
rams for tool joint or tool clearance. They are also used
for general stack spacing and to connect the stack with
existing well connections.

 BOP Stack
• Rams:
 Outlet Spools :
Outlet spools or circulating ports are used to access the well.
An outlet spool should always have a BOP (pipe ram or
blind ram) below it in case the outlet fails.
 Choke & Kill Lines :
The choke and kill lines are connected to a circulating port or
to an outlet on the stack arrangement. These lines
provide a circulating and routing system for pumping into
or taking returns from the well.

snubbing unit components.pptx sklcidjcsihchdc

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