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Casing and Tubing

Casing and Tubing

Casing-and-Tubing

Oil country tubular goods (OCTG) is a family of seamless rolled products consisting of drill pipe, casing and tubing subjected to loading conditions according to their specific application.
Standards:

  • API Spec 5CT latest edition at time of manufacture (PSL-1, PSL-2, PSL, 3)
  • ISO 11960:2004, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells

Sizes range:

  • Outside Diameter: 1.660″ – 30″
  • Length:Range 1, Range 2 & Range 3

Casing Thread

  • Available in short thread and coupling (S.T.C)
  • long thread and coupling (L.T.C)
  • buttress threaded and coupled (B.T.C)

Grades:

  • Casing H40, J55-K55, N80, L80 (1), C95, P110
  • Tubing H40, J55-K55, N80, L80 (1), C95, P110
  • Drill Pipes E75, X95, G105, S135

Connections:

  • STC (short round thread casing)
  • LTC (long round thread casing)
  • BTC (buttress thread casing)
  • XL (extreme-line casing)
  • NUE (non-upset tubing)
  • EUE (external upset tubing)
  • IJ (integral joint tubing)
Corrosion resistance under sour service conditions is a very important OCTG characteristic, especially for casing and tubing.Tubing is pipe through which the oil or gas is transported from the wellbore.

Tubing segments are generally around 30 ft [9 m] long with a threaded connection on each end.

Premium Connections

And almost any premium & gas tight connection
Protection:

  • External bare and uncoated or externally coated with black/ transparent anti rust Mill varnish
  • Plastic or Metal Pin and Box Protectors.
  • Internal plastic coating or sleeves.

Mill Test Certificates:

  • Issued in accordance with API Specification 5CT Eighth Edition
  • Additional Third Party Inspection can also be performed on request.

For pipes covered by this standard, the sizes, masses and wall thicknesses as well as grades and applicable end-finishes are listed in Tables C.1 to C.3 and Tables E.1 to E.3. By agreement between the purchaser and manufacturer, this standard can also be applied to other plain-end pipe sizes and wall thicknesses.
The main chemical compositions(%) of Tubing and Casing:

Grade Type C Mn Mo Cr Ni Co P S Si
Min Max Min Max Min Max Min Max Max Max Max Max Max
H40 0.03 0.03
J55 0.03 0.03
K55 0.03 0.03
N80 1.00 0.03 0.03
N80 Q 0.03 0.03
M65 0.03 0.03
L80 1.00 0.43a 1.90 0.25 0.35 0.03 0.03 0.45
L80 9Cr 0.15 0.30 0.60 0.90 1.10 8.00 10.00 0.50 0.25 0.02 0.01 1.00
L80 13Cr 0.22 0.25 1.00 12.00 14.00 0.50 0.25 0.02 0.01 1.00
C90 1.00 0.35 1.20 0.25b 0.85 1.50 0.99 0.02 0.01
C90 2.00 0.50 1.90 Nl NL 0.99 0.03 0.01
C95 0.45c 1.90 0.03 0.03 0.45
T95 1.00 0.35 1.20 0.25d 0.85 0.40 1.50 0.99 0.02 0.01
T95 2.00 0.50 1.90 0.99 0.03 0.01
P110 0.03 0.03
Q125 1.00 0.35 1.00 0.75 1.20 0.99 0.02 0.01
Q125 2.00 0.35 1.00 NL NL 0.99 0.02 0.02
Q125 3.00 0.50 1.90 NL NL 0.99 0.03 0.01
Q125 4.00 0.50 1.90 NL NL 0.99 0.03 0.02

Note:

a product uses oil quenching, L80 grade carbon content of the upper limit may be increased to 0.50%.
b If the wall thickness
c If the product oil quenching, the C95 grade carbon content limit may be increased to 0.55%.
d If the wall thickness
NL-Not limit, but must show the element content in the product by reported.

Mechanical Properties of Tubing and Casing

Grade Type TEUL(%) Yield strength
(Pa)
Tensile
(MPa)
Hardnessa S.W.T.
(m)
HRCb
Min Max Min Min Max
H40 0.5 276 552 414
J55 0.5 379 552 517
K55 0.5 379 552 655
N80 1 0.5 552 758 689
N80 Q 0.5 552 758 689
M65 0.5 448 586 586 22 235
L80 1 0.5 552 655 655 23 241
L80 9Cr 0.5 552 655 655 23 241
L80 13Cr 0.5 552 655 655 23 241
C90 1,2 0.5 621 724 689 25.4 255 12.70 3
C90 1,2 0.5 621 724 689 25.4 255 12.71~19.04 4
C90 1,2 0.5 621 724 689 25.4 255 19.05~25.39 5
C90 1,2 0.5 621 724 689 25.4 255 25.4 6
C95 0.5 655 758 724
T95 1,2 0.5 655 758 724 25.4 255 12.70 3
T95 1,2 0.5 655 758 724 25.4 255 12.71~19.04 4
T95 1,2 0.5 655 758 724 25.4 255 19.05~25.39 5
T95 1,2 0.5 655 758 724 25.4 255 25.4 6
P110 0.6 758 965 862
Q125 1~4 0.65 862 1034 931 b 12.70 3
Q125 1~4 0.65 862 1034 931 b 12.71~19.04 4
Q125 1~4 0.65 862 1034 931 b >=19.05 5

Note:

a Dispute, the Rockwell hardness of the laboratory should be used as the arbitration.
b Hardness limit is not specified, but according to the provisions of 7.8 and 7.9 in the most amount of change as production control.
TEUL: Total elongation under load
SWT: Specified wall thickness
HRC Allowable hardness change

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