API 5CT Casing is a standard established by the American Petroleum Institute (API) for oil and gas transportation. It is a hollow circular steel pipe specially treated to enhance durability and reliability. The standard sizes range from 4 inches to 9 inches, catering to varying flow requirements.
Key features of API 5CT casing include high strength, durability, and excellent sealing performance. With high yield and tensile strength, it can withstand high-pressure and high-temperature operating conditions. Additionally, its surface undergoes anti-corrosion treatment, effectively preventing corrosion and oxidation. As a result, API 5CT casing maintains its performance and reliability over extended periods.
API 5CT casing is widely used in oil well applications. It is installed along the inner walls of oil wells for drilling and development purposes. During oil and gas extraction, it works in conjunction with tubing to transport crude oil and natural gas from underground formations to surface facilities. Furthermore, it facilitates the circulation of drilling fluids, water, and gases from the wellbore to the surface during drilling operations. API 5CT casing plays a critical role in these applications.
Types of Casing pipe:
Seamless casing (small-diameter, medium-diameter)
ERW casing (medium-diameter)
Casing nipple
Casing coupling
Connections of casing pipe
API 5CT is applicable to following connections which complied with API SPEC 5B:
• SC: Short round thread casing
• LC: Long ound thread casing
• BC: Buttress thread casing
• NU: Non-upset tubing
• EU: External upset tubing
• IJ: Integral tubing connections
4 Groups of Grade
• Group 1: All casing and tubing in Grades with H, J, K, N and R
• Group 2: All casing and tubing in Grades with C, L, M and T
• Group 3: All casing and tubing in Grade P
• Group 4: All casing in Grade Q
Specification
API 5CT casing pipes with the following sizes and specifications:
Standard and Grades: API 5CT J55 / K55, N80-1, N80Q, C90, T95, P110, Q125 and 13Cr
Casing Pipe Size range: 5 1/2 "to 20" Length usually in R3.
Tubing Pipe dimensions range: 1.0 ", 1.315", 1.66 ", 1.9", 2.063 ", 2 3/8", 3 1/2 "and 4 1 /2", Length in R2.
Type of connections for Casing: BTC (thread coupling buttress), LTC (long round thread coupling), premium connection.
Types of connections for Tubing: BTC, NUE, EUE, Premium
Casing Outer Diameter and Wall Thickness
|
Outer Diameter |
Wall Thickness |
Grade |
Thread |
Length |
||
|
in |
mm |
kg/m |
Ib/ft |
|||
|
4 1/2" |
114.3 |
14.14-22.47 |
9.50-15.10 |
J55/N80/P110/K55 |
LTC/STC/BTC |
R1/R2/R3 |
|
5" |
127 |
17.11-35.86 |
11.50-24.10 |
J55/N80/P110/K55 |
LTC/STC/BTC |
R1/R2/R3 |
|
5 1/2" |
139.7 |
20.83-34.23 |
14.00-23.00 |
J55/N80/P110/K55 |
LTC/STC/BTC |
R1/R2/R3 |
|
6 5/8" |
168.28 |
29.76-35.72 |
20.00-24.00 |
J55/N80/P110/K55 |
LTC/STC/BTC |
R1/R2/R3 |
|
7" |
177.8 |
25.30-56.55 |
17.00-38.00 |
J55/N80/P110/K55 |
LTC/STC/BTC |
R1/R2/R3 |
|
7 5/8" |
193.68 |
35.72-63.69 |
24.00-42.80 |
J55/N80/P110/K55 |
LTC/STC/BTC |
R1/R2/R3 |
|
8 5/8" |
219.08 |
35.72-72.92 |
24.00-49.00 |
J55/N80/P110/K55 |
LTC/STC/BTC |
R1/R2/R3 |
|
9 5/8" |
244.48 |
48.07-86.91 |
32.30-58.40 |
J55/N80/P110/K55 |
LTC/STC/BTC |
R1/R2/R3 |
|
10 3/4" |
273.05 |
48.73-97.77 |
32.75-65.70 |
J55/N80/P110/K55 |
LTC/STC/BTC |
R1/R2/R3 |
|
11 3/4" |
298.45 |
62.50-89.29 |
42.00-60.00 |
J55/N80/P110/K55 |
LTC/STC/BTC |
R1/R2/R3 |
|
13 3/8" |
339.72 |
71.43-107.15 |
48.00-72.00 |
J55/N80/P110/K55 |
LTC/STC/BTC |
R1/ |
Steel Casing Pipe Dimensions and Weight Chart
API 5CT Casing and Tubing Chemical components and mechanical property
