API 5CT Casing

Casing is a steel pipe used to support the well wall of oil and gas wells to ensure the normal operation of the whole oil well during drilling and after completion. According to different drilling depths and geological conditions, several layers of casing should be used in each well. Cement should be used for cementing after casing running, which is different from tubing and drill pipe and cannot be reused. It is a disposable consumable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes.

 

Casing is a kind of large diameter pipe, which can fix the wall or hole of oil and gas wells. Casing is inserted into the borehole and fixed with cement to prevent the formation separated from the borehole and borehole collapse, and ensure the circulating flow of drilling mud, so as to facilitate drilling and exploitation.

 

套管按使用情况可分为：导管、表层套管、技术套管和油层套管。

 

表层套管

-     保护钻井，使其避免受浅水层及浅气层污染，

-     支撑井口设备并保持套管的其他层重量。

 

 

技术套管

-     分隔不同层面的压力，以便钻液额度正常流通并保护生产套管。

-     以便在钻井内安装反爆裂装置、防漏装置及尾管。

 

 

油层套管

-     将石油和天然气从地表下的储藏层里导出。

-     用于保护钻井，将钻探泥浆分层。

 

下图即显示了在开采过程中使用的不同类型的套管：

石油套管是维持油井运行的生命线。由于地质条件不同，井下受力状态复杂，拉、压、弯、扭应力综合作用作用于管体，这对套管本身的质量提出了较高的要求。一旦套管本身由于某种原因而损坏，可能导致整口井的减产，甚至报废。

 

按钢材本身的强度套管可分为不同钢级，即J55、K55、N80、L80、C90、T95、P110、Q125、V150等。井况、井深不同，采用的钢级也不同。在腐蚀环境下还要求套管本身具有抗腐蚀性能。在地质条件复杂的地方还要求套管具有抗挤毁性能。

 

 

石油套管外径通常为114.3毫米到508毫米。
 

规格			钢级								执行标准
OD外径mm(in)	Thickness壁厚mm	单位长度名义重量 kg/m (带螺纹和接箍)	H40	J55、K55	M65	L80、C95	N80	C90、T95	P110	Q125
							1类、Q
114.30	5.21	14.14	P/S	P/S	P/S						API 5CT
(4-1/2)	5.69	15.63		P/S/B	P/S/B
	6.35	17.26		P/S/L/B	P/L/B	P/L/B	P/L/B	P/L/B	P/L/B
	7.37	20.09			P/L/B	P/L/B	P/L/B	P/L/B	P/L/B
	8.56	22.47							P/L/B	P/L/B
127.00(5)	5.59	17.11		P/S	P/S
	6.43	19.35		P/S/L/B	P/S/L/B
	7.52	22.32		P/S/L/B/E	P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	9.19	26.79			P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	11.10	31.85			P/L/B	P/L/B	P/L/B	P/L/B	P/L/B	P/L/B
	12.14	34.53				P/L/B	P/L/B	P/L/B	P/L/B	P/L/B
	12.70	35.86				P/L/B	P/L/B	P/L/B	P/L/B	P/L/B
139.70	6.20	20.83	P/S	P/S	P/S
(5-1/2)	6.98	23.07		P/S/L/B/E	P/S/L/B
	7.72	25.3		P/S/L/B/E	P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	9.17	29.76			P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	10.54	34.23			P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	12.70	39.88						P
	14.27	44.2						P
	15.88	48.51						P
	17.45	52.53						P
	19.05	56.55						P
	20.62	60.27						P
	22.22	61.14						P
168.28	7.32	29.76	P/S	P/S/L/B	P/S/L/B
(6-5/8)	8.94	35.72		P/S/L/B/E	P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	10.59	41.67			P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	12.06	47.62				P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
177.80(7)	5.87	25.3	P/S
	6.91	29.76	P/S	P/S	P/S
	8.05	34.23		P/S/L/B/E	P/L/B	P/L/B/E	P/L/B/E	P/L/B/E
	9.19	38.69		P/S/L/B/E	P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	10.36	43.16			P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	11.51	47.62			P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	12.65	52.09				P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	13.72	56.55				P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	15.88	63.54						P
	17.45	69.05						P
	19.05	74.56						P
	20.62	79.77						P
	22.22	84.97						P
193.68	7.62	35.72	P/S
(7-5/8)	8.33	39.29		P/S/L/B/E	P/S/L/B	P/L/B/E	P/L/B/E	P/L/B/E
	9.52	44.2			P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	10.92	50.15			P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	12.70	58.04				P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	14.27	63.69				P/L/B	P/L/B	P/L/B	P/L/B	P/L/B
	15.11	67.41				P/L/B	P/L/B	P/L/B	P/L/B	P/L/B
	15.88	70.09				P/L/B	P/L/B	P/L/B	P/L/B	P/L/B
	17.45	76.19						P
	19.05	82.3						P
196.85	15.11	68.6				P	P	P	P	P
(7-3/4)
219.08	6.71	35.72		P/S	P/S
(8-5/8)	7.72	41.67	P/S		P/S
	8.94	47.62	P/S	P/S/L/B/E	P/S/L/B
	10.16	53.57		P/S/L/B/E	P/S/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	11.43	59.53			P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	12.70	65.48				P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	14.15	72.92				P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
244.48	7.92	48.07	P/S
(9-5/8)	8.94	53.57	P/S	P/S/L/B	P/S/L/B
	10.03	59.53		P/S/L/B/E	P/S/L/B	P/L/B/E	P/L/B/E	P/L/B/E
	11.05	64.73			P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	11.99	69.94			P/L/B	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	13.84	79.62				P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E	P/L/B/E
	15.11	86.91				P/L/B	P/L/B	P/L/B	P/L/B	P/L/B
	15.47	88.4						P
	17.07	96.58						P
	18.64	104.62						P
	20.24	112.5						P
273.05	7.09	48.74	P/S
(10-3/4)	8.89	60.27	P/S	P/S/B	P/S/B
	10.16	67.71		P/S/B/E	P/S/B
	11.43	75.9		P/S/B/E	P/S/B	P/S/B/E	P/S/B/E	P/S/B/E	P/S/B/E
	12.57	82.59			P/S/B	P/S/B/E	P/S/B/E	P/S/B/E	P/S/B/E
	13.84	90.33						P/S/B/E	P/S/B/E	P/S/B/E
	15.11	97.77						P/S/B	P/S/B	P/S/B
	17.07	108.93						P
	18.64	117.86						P
	20.24	126.94						P
298.45	8.46	62.5	P/S
(11-3/4)	9.53	69.94		P/S/B	P/S/B
	11.05	80.36		P/S/B	P/S/B
	12.42	89.29		P/S/B	P/S/B	P/S/B	P/S/B	P/S/B	P/S/B	P/S/B
	13.56	96.73				P	P	P	P	P
	14.78	105.66				P	P	P	P	P
339.72	8.38	71.43	P/S
(13-3/8)	9.65	81.1		P/S/B	P/S/B
	10.92	90.78		P/S/B	P/S/B
	12.19	101.19		P/S/B	P/S/B	P/S/B	P/S/B	P/S/B	P/S/B
	13.06	107.15				P/S/B	P/S/B	P/S/B	P/S/B	P/S/B
406.40	9.53	96.73	P/S
(16)	11.13	111.61		P/S/B	P/S/B
	12.57	125.01		P/S/B	P/S/B
	16.66	162.21		P		P	P		P	P
473.08	11.05	130.21	P/S	P/S/B	P/S/B
(18-5/8)
508.00	11.13	139.89	P/S/L	P/S/L/B	P/S/L/B
(20)	12.70	158.49		P/S/L/B	P/S/L/B
	16.13	197.93		P/S/L/B
注：P-平端管、S-短圆螺纹、L-长圆螺纹、B-偏梯螺纹、E-直连型