API 5ct k55 seamless steel casing tube

API-5CT K55 oilfield casing pipe is very similar to J55, there is no significant difference in the chemical composition and yield strength, however the ultimate tensile strength  of K55 is higher than J55 steel, K55/J55 are 655MPa and 517MPa respectively.

K55 has better mechanical and thermal fatigue resistance and crack resistance than J55. For a thermal production well, the heavy wall K55 casing is appropriate instead of J55 casing. The former has a better thermal fatigue resistance property than the latter.

Inspection
Physical properties are checked and each length hydrostatically tested, normally to only 3,000 psi in the plain end (unthreaded) condition.
The following are also checked:
Dimensions
Weights
Straightness
Lengths
Part of this inspection is to drift all lengths.
Despite all the American Petroleum Institute (API) specifications and testing, some tubing defects are still found after delivery; thus, some operators
do further inspection.

Inspection Method
Size and surface inspection
NDT and pressure test and third party certication
Hydrostatic
Drifting test
Physical and chemicail analysis
Hardness and pressure test.
Electromagnetic
Magnetic particle
Ultrasonic
 

Dimensions And Weight

Size	Weight	Outside Diameter		Wall Thickness		End Finish
						Grade
		in	mm	in	mm	J55K55	L80	N80	C90T95	P110
4 1/2	9.50	4.500	114.3	0.205	5.21	PS	–	–	–	–
	10.50			0.224	5.69	PSB	–	–	–	–
	11.60			0.250	6.35	PSLB	PLB	PLB	PLB	PLB
	13.50			0.290	7.37	–	PLB	PLB	PLB	PLB
	15.10			0.337	9.56	–	–	–	–	PLB
5	11.50	5.00	127.00	0.220	5.59	PS	–	–	–	–
	13.00			0.253	6.43	PSLB	–	–	–	–
	15.00			0.296	7.52	PSLB	PLB	PLB	PLBE	PLB
	18.00			0.362	9.19	–	PLB	PLB	PLBE	PLB
	21.40			0.437	11.10	–	PLB	PLB	PLB	PLB
	23.20			0.478	12.14	–			PLB
	24.10			0.500	12.70	–			PLB
5 1/2	14.00	5.500	139.7	0.244	6.20	PS	–	–	–	–
	15.50			0.275	6.98	PSLB	–	–	–	–
	17.00			0.304	7.72	PSLB	PLB	PLB	PLBE	PLB
	20.00			0.361	9.17	–	PLB	PLB	PLBE	PLB
	23.00			0.415	10.54	–	PLB	PLB	PLBE	PLB
6 5/8	20.00	6.625	168.28	0.288	7.32	PSLB	–	–	–	–
	24.00			0.352	8.94	PSLB	PLB	PLB	PLBE	PLB
	28.00			0.417	10.59	–	PLB	PLB	PLBE	PLB
	32.00			0.475	12.06	–	PLB	PLB	PLBE	PLB
7	17.00	7.00	177.80	0.231	5.87	–	–	–	–	–
	20.00			0.272	6.91	PS	–	–	–	–
	23.00			0.317	8.05	PSLB	PLB	PLB	PLBE	–
	26.00			0.362	9.19	PSLB	PLB	PLB	PLBE	PLB
	29.00			0.408	10.36	–	PLB	PLB	PLBE	PLB
	32.00			0.453	11.51	–	PLB	PLB	PLBE	PLB
	35.00			0.498	12.65	–	PLB	PLB	PLBE	PLB
	38.00			0.540	13.72	–	PLB	PLB	PLBE	PLB
7 5/8	24.00	7.625	193.68	0.300	7.62	–	–	–	–	–
	26.40			0.328	8.33	PSLB	PLB	PLB	PLBE	PLB
	29.70			0.375	9.52	–	PLB	PLB	PLBE	PLB
	33.70			0.430	10.92	–	PLB	PLB	PLBE	PLB
	39.00			0.500	12.70	–	PLB	PLB	PLBE	PLB
	42.80			0.562	14.27	–	PLB	PLB	PLB	PLB
	45.30			0.595	15.11	–	PLB	PLB	PLB	PLB
	47.10			0.625	15.88	–	PLB	PLB	PLB	PLB
8 5/8	24.00	8.625	219.08	0.264	6.71	PS	–	–	–	–
	28.00			0.304	7.72	–	–	–	–	–
	32.00			0.352	8.94	PSLB	–	–	–	–
	36.00			0.400	10.16	PSLB	PLB	PLB	PLBE	PLB
	40.00			0.450	11.43	–	PLB	PLB	PLBE	PLB
	44.00			0.500	12.70	–	PLB	PLB	PLBE	PLB
	49.00			0.557	14.15	–	PLB	PLB	PLBE	PLB
9 5/8	32.30	9.625	244.48	0.312	7.92	–	–	–	–	–
	36.00			0.352	8.94	PSLB	–	–	–	–
	40.00			0.395	10.03	PSLB	PLB	PLB	PLBE	–
	43.50			0.435	11.05	–	PLB	PLB	PLBE	PLB
	47.00			0.472	11.99	–	PLB	PLB	PLBE	PLB
	53.50			0.545	13.84	–	PLB	PLB	PLBE	PLB
	58.40			0.595	15.11	–	PLB	PLB	PLB	PLB
10 3/4	32.75	10.75	273.05	0.279	7.09	–	–	–	–	–
	40.50			0.350	8.89	PSB	–	–	–	–
	15.50			0.400	10.16	PSB	–	–	–	–
	51.00			0.450	11.43	PSB	PSB	PSB	PSBE	PSB
	55.50			0.495	12.57	–	PSB	PSB	PSBE	PSB
	60.70			0.545	13.84	–	–	–	PSBE	PSB
	65.70			0.595	15.11	–	–	–	PSB	PSB
13 3/8	48.00	13.375	339.73	0.330	8.38	–	–	–	–	–
	54.50			0.380	9.65	PSB	–	–	–	–
	61.00			0.430	10.92	PSB	–	–	–	–
	68.00			0.480	12.19	PSB	PSB	PSB	PSB	PSB
	72.00			0.514	13.06	–	PSB	PSB	PSB	PSB
16	65.00	16	406.40	0.375	9.53	–	–	–	–	–
	75.00			0.438	11.13	PSB	–	–	–	–
	84.00			0.495	12.57	PSB	–	–	–	–
	109.00			0.656	16.66	P	P	P	–	P
18 5/8	87.50	18.625	473.08	0.435	11.05	PSB	–	–	–	–
20	94.00	20	508.00	0.438	11.13	PSLB	–	–	–	–
	106.50			0.500	12.70	PSLB	–	–	–	–
	133.00			0.635	16.13	PSLB	–	–	–	–

 

Chemical Properties
Carbon	Silicon	Manganese	Phosphorous	Sulphur	Molybdenum	Nickel	Chromium	Copper	Others
–	–	–	0.03	0.03	–	–	–	–	–

 

Mechanical Properties
Yield Strength		Tensile Strength			Elongation A5 min
MPa min	ksi min	MPa min	MPa min	ksi min	Percentage
		655	–	95	–