Production tubing is installed in oil and gas wells to allow hydrocarbons to flow from the reservoir to the surface while protecting the casing from reservoir fluids. Tubing is specified based on its size, length, grade, and connection type. Common tubing sizes range from 2-3/8" to 4-1/2" in diameter. Tubing joints are typically 20-48 feet in length. Tubing grade depends on the application and is chosen based on strength, corrosion resistance, and availability. Connections can be either upset or non-upset threaded types.

1. Production Tubing
D o w n h o l e E q u i p m e n t
Eng. El Sayed Amer
10

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10 Tubing
applications
• Production tubing is installed to allow
hydrocarbons to flow from reservoir to the
surface and protect the casing from reservoir
fluid.
• production tubing generally averages 28-32 feet
in length.

3. Eng. El Sayed Amer
10 Tubing
applications
Tubing is “typed” according to four criteria.
I. Size :
Refers to the outside diameter (in inches or millimeters) or the tube body
itself. Tubing is available in various external diameters. API recognized sizes
for production tubing vary from 3/4 inch to 4 1/2 inch.
II. Weight:
An average given in pounds/foot of kilograms/meter. Tubing is available in
various weights for each particular size.
III. Grade:
Term used to describe the type of metal alloy of which the pipe is made. J-
55, N-80, P-105.
IV. Thread:
Design of the connection on either end of the pipe

4. Eng. El Sayed Amer
10 Tubing
applications
Tubing is “typed” according to four criteria.
I. Size:
is the outside diameter of the pipe body. The most used sizes are:
2-⅜” , 2-⅞” , 3-½” and 4-½”.

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YIELD STRENGTH ksi
GRADE
Minimum Maximum
HEAT
TREATMENT*
TYPICAL
HARDNESS
(Rockwell)
J-55 (Tubing) 55 80 - -
K-55 (Casing) 55 80 - -
C-75 75 90 N&T, Q&T 14-26
L-80 80 95 Q&T 23 max.
N-80 80 110 N,N&T,Q&T 16-25
C-95 95 110 Q&T 18-25
P-105 (Tubing) 105 135 Q&T 25-32
P-110 (Casing) 110 140 Q&T 27-35
* Heat treatments as follows:
N = Normalised
N&T = Normalised and Tempered
Q&T = Quenched and Tempered.
Yield Strengths

6. Eng. El Sayed Amer
10 Tubing
applications
Tubing is “typed” according to four criteria.
II. Length:
Tubulars are manufactured in lengths termed joints
✓ range 1 : 20 to 24 feet;
✓ range 2 : 28 to 32 feet;
✓ range 3 : 32 to 48 feet
Pup joints or spacers are used for shorter lengths.
Tubing Ranges
Range 1 (feet) Range 2 (feet) Range 3 (feet)
20-24 28-32 38-42

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10 Tubing
applications

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PUP JOINTS
Pup joints are short tubing joints that give flexibility in attaining
a desired tubing length

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10 Tubing
applications
Tubing is “typed” according to four criteria.
III. Grade:
Tubing grades criteria are specified by API:
• Standard API grades J-55, C-75, C-95, N-80, P-105
• Special grades e.g., C-75 and C-95 for H2S service
Selection of tubing grade is based on:
• Physical strength
• Chemical Properties (resistance to H2S, CO2, water etc.)
• Availability and standardization at customer
• Cost

10. Eng. El Sayed Amer
10 Tubing
applications
Tubing is “typed” according to four criteria.
III. Grade:
• Sour Corrosion: resistance to H2S, low hardness, stress relieved, J55, C75, C95.
• Sweet Corrosion: CO2, provisions for inhibition or appropriate material selection,
L80 13 Cr

11. Eng. El Sayed Amer
10 Tubing
applications
Tubing is “typed” according to four
criteria.
III. Connections:
Two standard API Connections available:
1. Non-Upset (NUE):
• is a 10 round thread.
• Joint strength<Pipe body
2. Upset Connection (EUE)
• Is a 8 round thread.
• Joint strength>pipe body

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There are two types of thread connection, API and Premium:
• Premium connections are proprietary connections that offer premium
features not available on API connections.
• Most offer a metal-to-metal seal for improved high pressure seal integrity.
• Premium connections exist with features such as flush connections, recess
free bores, and special clearance.
• An example of a premium thread is shown in the following fig:
III.Connections:

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140
Non-upset
(8 round) Connection
External Upset
Connection
EUE
Integral Connection
Hydril
Integral Connection
Production Tubing connections

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Production Tubing
Design of production tubing should satisfy the following criteria:
• Minimizing pressure drop
01
02
03
04
• High strength for suspension
of tubing joints
• High internal pressures for
fluids flow
• High external pressures
(between annulus & tubing)
05 • Resistant to chemical
corrosion

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Tubing Connection Make up Torque
I. Under torque ------------------ leakage
II.Over torque ------------------thread failure &
damage to seal
I. Recommended torque values are applied by manufactures .

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Tubing Color Codes