This document discusses side sliding doors and side pocket mandrels. Side sliding doors, also known as sliding sleeves, are used to provide controlled communication between the tubing and casing annulus. They can enable well killing by fluid circulation. Side pocket mandrels are used to install gas lift valves, dummies, or chemicals at intervals along the tubing string. Gas is injected into the tubing/casing annulus and acts on the gas lift valves to lift liquid up the tubing.

1. Side Sliding Door
D o w n h o l e E q u i p m e n t
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07 Side Sliding Door
• Function
Ω Also known as Sliding Sleeves
Ω To provide controlled communication between the tubing and
casing annulus.

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05 Side Sliding Door (SSD)
Sliding (inner)
Sleeve
Seals
Ports
Seals
Inner Ports
OPEN CLOSED

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Enable Well Kill
Sliding Side
Door (SSD)
Can be Annulus to Tubing
Or
Tubing to Annulus
Side Sliding Door (SSD)

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applications
1. Fluid displacement
2. Well killing (by fluid circulation)
3. Kicking off wells (gas lift)
4. Chemical injection.
• Additional units can be employed elsewhere for:
5. Selective testing, treating or producing multiple
zones.
6. Commingled production.
7. Pressure equalization.
applications

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Activation
Mechanism
Side Sliding Door (SSD)
The sleeve within an SSD may be shifted by:
1. Wireline methods
2. Coiled tubing methods
3. Pressure application to the tubing after
dropping or running a shifting dart
4. Pressure application to the annulus, acting on
the differential piston area of the SSD sleeve

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Wireline Shifting Tool
Side Sliding Door (SSD)
1. Shifting Tool is used to move SSD inner sleeve to
its open or closed position
2. There are those which open by upward movement
of the inner sleeve and others which open by
moving the inner sleeve downward.
• Jar up to open sleeves
• Jar down to open sleeves

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SSD Landing nipples
Side Sliding Door (SSD)
1. Most sliding sleeves incorporate a
landing nipple profile (usually X or
R) in the top sub into which a lock
mandrel and plug can be placed by
means of wireline.

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SSD Trouble shooting
Side Sliding Door (SSD)
1. Operational access problems due to well deviation where
jarring may be difficult
2. Medium to long term seal failure
– Operational failure (stuck valves and sleeves)
3. CO2 or H2 S is produced, as seal damage may occur.
4. If the temperature is greater than 225°F, whereby seal damage
may occur.

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08 Expansion Joint
applications
A device or completion component designed to enable relative movement
between two fixed assemblies in the event of thermal expansion or
contraction. The forces generated by thermal expansion or contraction can
be significant. Expansion joints within the completion assembly prevent any
movement or forces being transmitted to fixed components such as packers
or tubing hangers.
Also called :
1. Travel Joint
2. Telescopic Joint
• Used to provide up/down movement in tubing
• Locking/rotating versions
applications

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Packing
Inner Mandrel
Outer Sleeve

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Tubing deformation

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15. Side Pocket Mandrel
D o w n h o l e E q u i p m e n t
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08 Side Pocket Mandrel
applications
• Gas, at a controlled volume and pressure, is
injected into the tubing/casing annulus.
• The tubing string has been fitted with a number
of gas lift valves.
• These valves are installed at spaced intervals so
that any liquid present above them in the
casing/tubing annulus can be removed by
injection of gas at the top of the well annulus
leading to the liquid U-tubing into the tubing and
its subsequent ejection from the well.
Gas Lift System

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Typical Gas Lift
System
Gas Lift Installations

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08 Side Pocket Mandrel
applications
• Install gas lift valves
• Dummies
• Chemical Injection
• Kill
Applications
• Wireline retrievable
• Conventional gas lift valve
types

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08 Side Pocket Mandrel
Side Pocket Mandrel
Gas Lift Dummy or Valve
Profile
Gas Ports

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08 Side Pocket Mandrel
Gas Lift Valve Installation
Fishing
neck
Injection gas enters
ports and acts
against the bellows
to unseat the ball
seal
Gas passes through
the check valve
which prevents
reverse flow to
annulus
Upper seal
Lower seal
Bottom latch
Port
bellowslock

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Running GLV in Side Pocket Mandrel (1)
Side Pocket Mandrel
Kick-over tool to run gas
lift valve assembly
Communication Equipment

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Running GLV in Side Pocket Mandrel (2)
GLV passing through (by-passing
mandrel)
Kick-over tool oriented and
tripped
Communication Equipment

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Running GLV in Side Pocket Mandrel (3)
GLV latched in valve pocket
Kick-over tool retrieved
Communication Equipment