API 5CT P110 Well Casing Pipe

API 5CT is a specification for casing and tubing used in oil wells in the oil and gas industry. This standard specifies the technical delivery conditions for steel pipes (casing, tubing, and pup joint), fitting stock, fitting materials, and accessory materials, and establishes requirements for three product specification levels (PSL-1, PSL-2, and PSL-3).

API P110 casing is a type of API 5CT oil well casing primarily used in deep well operations. It can be fitted with various end connections, such as non-thickened or externally thickened ends.

P110 Casing Specifications

Outer Diameter: 4 1/2″ – 13 3/8″ (114.30 – 339.72 mm)

Wall Thickness: 6.35 – 16.13 mm (varies by specification)

Length: R1 (4.88-7.62m), R2 (7.62-10.36m), R3 (10.36-14.63m)

Thread Type: BTC / LTC / STC

P110 Casing Properties

1. High Strength and Load Capacity

Yield strength up to 110 ksi, capable of withstanding the enormous external extrusion pressure in deep wells and the high pressure during production and fracturing processes.

2. Excellent Comprehensive Performance

After quenching and tempering, its strength and toughness are superior to normalized steel grades (such as N80).

3. Economic Benefits

Among ultra-high strength steel grades (compared to Q125 and V150), P110 offers superior cost-effectiveness, making it an ideal choice for deep well designs.

4. Process Compatibility

It supports cold drawing, hot rolling, and heat treatment processes, meeting diverse engineering requirements.

API 5CT Grade P110 Casing Color Code

Name	Casing	Coupling
P110	A bright white band	Entire white coupling

API 5CT P110 Casing Chemical Composition

Grade	C≤	Si≤	Mn≤	P≤	S≤	Cr≤	Ni≤	Cu≤	Mo≤	V≤
API 5CT P110	0.26-035	0.17-0.37	0.40-0.70	0.020	0.010	0.80-1.10	0.20	0.20	0.15-0.25	0.08

API 5CT P110 Casing Mechanical Property

Grade	Type	Yield strength MPa	Tensile strength min. MPa	Total elongation under load %
P110	/	758-965	862	0.6

API 5CT P110 Casing Tolerance

Item		Allowable tolerance
Outer diameter	Pipe body	D≤101.60mm±0.79mm
		D≥114.30mm+1.0%
		-0.5%
Wall thickness		-12.5%
Wight	Single piece	+6.5%+3.5%
	Total weight	-1.75

API 5CT P110 Casing Pipe Dimensions

Outer Diameter		Wall Thickness	Weight	Grade	Threaded	Length
in	mm	kg/m	lb/ft
4 1/2″	114.3	14.14-22.47	9.50-11.50	P110	LTC/STC/BTC	R1/R2/R3
5″	127	17.11-35.86	11.50-24.10	P110	LTC/STC/BTC	R1/R2/R3
5 1/2″	139.7	20.83-34.23	14.00-23.00	P110	LTC/STC/BTC	R1/R2/R3
6 5/8″	168.28	29.76-35.72	20.00-24.00	P110	LTC/STC/BTC	R1/R2/R3
7″	177.8	25.30-56.55	17.00-38.00	P110	LTC/STC/BTC	R1/R2/R3
7 5/8″	193.68	35.72-63.69	24.00-42.80	P110	LTC/STC/BTC	R1/R2/R3
8 5/8″	219.08	35.72-72.92	24.00-49.00	P110	LTC/STC/BTC	R1/R2/R3
9 5/8″	244.48	48.07-86.91	32.30-58.40	P110	LTC/STC/BTC	R1/R2/R3
10 3/4″	273.05	48.73-97.77	32.75-65.70	P110	LTC/STC/BTC	R1/R2/R3
11 3/4″	298.45	62.50-89.29	42.00-60.00	P110	LTC/STC/BTC	R1/R2/R3
13 3/8″	339.72	71.43-107.15	48.00-72.00	P110	LTC/STC/BTC	R1/R2/R3

P110 Casing vs. N80 Casing

P110 has a yield strength approximately 37.5% higher than N80;

At the same strength, P110 has a thinner wall, is lighter, and has a larger inner diameter;

P110 is more economical and efficient in deep well designs.

P110 Casing vs. L80 Casing

Both have similar heat treatment processes, but L80's chemical composition and hardness control give it sulfur resistance.

In sulfur-containing environments, even if pressure requirements necessitate the strength of P110, high-strength sulfur-resistant steel grades, such as C95 or T95, must be selected; P110 should never be used.

Applications of P110 Casing

API 5CT P110 casing is a high-strength, quenched and tempered (Q&T) heat-treated steel grade, primarily used in:

Deep wells;

Ultra-deep wells;

High internal pressure, high external extrusion well conditions;

High-load environments during fracturing and completion stages.