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Drill Collars

Keywords: Drill Collar, Spiral Drill Collar, Non-Magnetic Drill Collar, Steel Drill Collar

Standard: API SPEC 7-1

Steel Grade: AISI 4145H

Sizes: 3 1/8" -- 11"

Connected Type: NC, IF, REG

Length: 30 – 31 ft ± 6 ft.

Type of Design: （1）Plain;（2） With A Recess of the Elevator; （3） With A Recess of the Elevator and Power Slips; （4） Spiral and A Wide Range of Type Mixtures.

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Drill collars are extra-heavy integral tools used to concentrate weight onto the drill bit so as to produce sufficient force for the drill bit to break rock efficiently while drilling. They are made of AISI 4145H modified steel and are connected between drill pipes and drill bits.

Drill collars come in 30 or 31 foot lengths and are furnished as slick (as-rolled surface finish) or spiraled. Spiraled drill collars have grooves on its external surface which maintains an even flow of drilling fluid around the collar to equalize pressure and reduce differential-sticking of the collar to the wall of the oilwell.

Our drill collar connections comply with dimensional requirements specified in API Spec. 7/7-1 and guidelines presented in API RP7G. Drill collars also come with slip and elevator recesses for safe and efficient handling. Slip and elevator recesses can be used together or separately and are machined in compliance with API RP7G guidelines unless otherwise specified.

NON-MAGNETIC DRILL COLLARS

TECHNICAL SUMMARY

As you drill in areas closer to the earth's magnetic poles, it is essential to use a non-magnetic drill collar. Our non-mag drill collars offer strength and hardness while neutralizing magnetic inference. Compatible with standard drill string tools and stabilizers, our non mag drill collars are manufactured to API Spec 7-1. Inventory includes:

（1）Slick

（2）Flex

（3）Spiral

（4）Pony

We treat our non-mag material ID with a shot peening operation to compress the inside diameter which prevents stress corrosion while drilling in H2S environments.

Resistant to stress corrosion in sour gas environments

Compatible with standard drill string tools and stablizers

Spiraling available on request

Used to add weight to the bit and stiffness to bottom hole assembly, our Drill Collars are an invaluable downhole tool.

STEEL DRILL COLLARS

To keep you drilling in the right direction, run our Drill Collars in combination with our Stabilizers to resist bucking. Manufactured from an AISI 4145H modified heat treated alloy steel, our strict quality assurance guidelines assure metallurgical integrity of each and every bar.

Our Drill Collar bars are batch or continuous line heat treated and have both cold-worked and Phosphate coated connections.

NON-MAGNETIC DRILL COLLARS

Common Connections	OD (in)	ID (in)	Approx Weight (lbs)
2 7/8 REG	3 1/2 to 3 7/8	1 1/4 to 1 3/4	760-1114
3 1/2 REG	4 1/8 to 4 1/2	1 1/4 to 2 1/4	989-1490
3 1/2 IF NC38	4 3/4 to 5 1/2	1 3/4 to 2 13/16	1350-2250
4 FH NC40	5 to 6	1 3/4 to 2 13/16	1552-2726
4 1/2 FH	5 1/2 to 6 1/2	2 to 3	1759-3166
4 1/2 XH NC46	5 3/4 to 6 3/4	2 1/4 to 3	1992-3352
4 1/2 IF NC50	6 1/4 to 7 1/2	2 1/4 to 3 1/4	2359-4237
5 1/2 FH NC56	7 to 7 3/4	2 1/4 to 3 1/4	3182-4552
6 5/8 REG	7 1/4 to 8	2 1/2 to 3 1/4	3476-4780
6 5/8 FH	7 1/2 to 8 1/4	2 1/2 to 3 1/4	3782-5116
7 5/8 REG	8 1/2 to 9 1/2	2 1/2 to 3 3/4	4816-6953

STEEL DRILL COLLARS

O.D. (in)	I.D. (in)	Weight in Air (lbs)	Unit Weight (lbs/ft)	Standard End Connections
3 1/2	1 1/2	826.8	26.7	NC-26 thru 35
4 1/8	2	1076.2	34	NC-31 thru 41
4 3/4	2 1/4	1447.0	46.7	NC-38 thru 47
5	2 1/4	1648.5	53.2	NC-38 thru 50
6	2 1/4	2558.0	82.5	NC-44 thru 60
6	2 13/16	2322.3	74.9	NC-44 thru 60
6 1/4	2 1/4	2811.2	90.7	NC-44 thru 62
6 1/4	2 13/16	2575.6	83.1	NC-46 thru 65
6 1/2	2 1/4	3074.8	99.2	NC-46 thru 65
6 1/2	2 13/16	2839.1	91.6	NC-46 thru 65
6 3/4	2 1/4	3348.7	108.0	NC-46 thru 67
7	2 1/4	3632.9	117.2	NC-50 thru 70
7	2 13/16	3397.2	109.6	NC-50 thru 70
7 1/4	2 13/16	3691.8	119.1	NC-50 thru 72
8	2 13/16	4637.5	149.6	6 5/8 Regular
8 1/4	2 13/16	4973.4	160.4	6 5/8 Regular
9 1/2*	3	6718.0	216.7	7 5/8 Regular
9 3/4*	3	7116.0	229.5	7 5/8 Regular
11*	3	9260.6	298.7	8 5/8 Regular

RECOMMENDED SLIP AND ELEVATOR RECESS DIAMETERS FOR DRILL COLLARS

Standard	Number	OD (in.)	ID (in.)	Length (ft)	Weight (lb/ft)	Typical Bending Strength Ratio
SY5144-2007/API7-1	NC 23-31	3-1/8	1-1/4	30	22	2.57:1
	NC 26-35 (2-3/8 IF)	3-1/2	1-1/2	30	27	2.42:1
	NC 31-41 (2-7/8 IF)	4-1/8	2	30 or 31	34	2.43:1
	NC 35-47	4-3 /4	2	30 or 31	47	2.58:1
	NC 38-50 (3-1/2 IF)	5	2-1/4	30 or 31	54	2.38:1
	NC 44-60	6	2-1/4	30 or 31	83	2.49:1
	NC 44-60	6	2-13 /16	30 or 31	76	2.84:1
	NC 44-62	6-1/4	2-1/4	30 or 31	91	2.91:1
	NC 46-62 (4 IF)	6-1/4	2-13 /16	30 or 31	84	2.63:1
	NC 46-65 (4 IF)	6-1/2	2-1/4	30 or 31	100	2.76:1
	NC 46-65 (4 IF)	6-1/2	2-13 /16	30 or 31	93	3.05:1
	NC 46-67 (4 IF)	6-3 /4	2-1/4	30 or 31	109	3.18:1
	NC 50-70 (4-1/2 IF)	7	2-1/4	30 or 31	118	2.54:1
	NC 50-70 (4-1/2 IF)	7	2-13 /16	30 or 31	111	2.73:1
	NC 50-72 (4-1/2 IF)	7-1/4	2-13 /16	30 or 31	120	3.12:1
	NC 56-77	7-3 /4	2-13 /16	30 or 31	140	2.70:1
	NC 56-80	8	2-13 /16	30 or 31	151	3.02:1
	6-5/8 API Reg	8-1/4	2-13 /16	30 or 31	162	2.93:1
	NC 61-90	9	2-13 /16	30 or 31	196	3.17:1
	7-5/8 API Reg	9-1/2	3	30 or 31	217	2.81:1
	NC 70-97	9-3 /4	3	30 or 31	230	2.57:1
	NC 70-100	10	3	30 or 31	243	2.81:1
	8-5/8 API Reg	11	3	30 or 31	300	2.84:1

NON-MAGNETIC DRILL COLLARS

Room Temperature. ASTM A 370
Drill Collar OD Range	Min. Yield Strength		Min. Tensile Strength		Min. Elongation %	Impact Test CHARPY V. notch
	MPa	PSI	MPa	PSI		J (min.)	ft-lbs (min.)
2 3/4″ thru 3 7/8″	827	120 000	896	130 000	16	81	60
4″ thru 6 7/8″	758	110 000	827	120 000	18
7″ thru 11″	689	100 000	758	110 000	20

STEEL DRILL COLLARS

Room Temperature. ASTM 4145 H Modified
Drill Collar OD Range	Min. Yield Strength		Min. Tensile Strength		Min. Elongation %	Impact Test CHARPY V. notch		Hardness (Brinell)
	MPa	PSI	MPa	PSI		J (min.)	ft-lbs (min.)	HBN
3 1/8″ thru 6 7/8″	758	110 000	965	140 000	13	54	40	285-341

What is OCTG and what are its main components?

OCTG stands for Oil Country Tubular Goods. It is a family of seamless or welded steel pipes specifically designed for use in oil and gas wells. OCTG is essential for drilling, completing, and producing from a well. The three primary components are:
Casing: The structural "backbone" of the well. It is run into the drilled hole to prevent the wellbore from collapsing and to isolate different underground formations (e.g., freshwater zones from oil/gas zones).
Tubing: The conduit placed inside the casing. It serves as the channel through which oil or gas is brought to the surface during production.
Drill Pipe: The heavy, thick-walled pipe used to transmit drilling fluid to the drill bit and to rotate the bit during the drilling process.

What steel grades do you supply, and what do they mean?

We supply a comprehensive range of API 5CT standard steel grades, each designed for specific well conditions. The grade indicates the minimum yield strength (in ksi) and the material's properties.
Group 1 (Standard Grades):
H40, J55, K55: General-purpose grades for shallow to medium-depth wells with low to moderate pressure. K55 is commonly used for surface casing.
Group 2 (Higher Strength):
N80 (Type 1 & 2): A versatile, high-strength grade suitable for a wide range of applications, including intermediate and production casing.
L80 (Type 1, 9Cr, 13Cr): Designed for sour service environments (containing H₂S). L80-13Cr offers superior corrosion resistance.
Group 3 (High Performance):
C90, T95: Used in high-pressure, high-temperature (HPHT) wells and sour service applications.
P110, Q125: High-strength grades for deep wells and high-pressure environments where maximum burst and collapse resistance are required.

What types of connections (threads) are available?

The connection is a critical component of any OCTG string. We offer both standard API connections and advanced Premium Connections.
API Connections:
Short Round Thread (STC): A simple, cost-effective connection for shallow wells.
Long Round Thread (LTC): Similar to STC but with a longer thread for slightly better performance.
Buttress Thread (BTC): Provides high tensile strength and is suitable for deeper, heavier wells.
Premium Connections (Non-API):
These are engineered for extreme conditions, offering superior gas-tight sealing, high tensile strength, and excellent fatigue resistance. They are essential for HPHT wells, deepwater applications, and complex well geometries. We can supply various premium connection types based on your specific project requirements.

How do you ensure the quality and integrity of the pipes?

We implement a rigorous multi-stage quality control process to ensure every pipe meets the required specifications:
Chemical Composition Analysis: Verifying the steel grade's elemental makeup.
Mechanical Property Testing: Including tensile, yield, hardness, and impact tests.
Hydrostatic Testing: Every pipe is pressure-tested to ensure it can withstand specified internal pressures without leaking.
Non-Destructive Testing (NDT): We utilize advanced NDT methods such as Ultrasonic Testing (UT) and Electromagnetic Testing (ET) to detect any internal or surface imperfections.
Dimensional Inspection: Precise measurement of outside diameter (OD), wall thickness, weight, and length.

What is your typical lead time and packaging for export?

Lead Time: For standard API grades and sizes, our lead time is typically 15-30 days after receiving the deposit and final order confirmation. For specialized grades or premium connections, the timeline may be longer.
Packaging: To ensure safe ocean transport, all OCTG products are securely packed. Threads are protected with steel or plastic protectors, and pipes are bundled with steel straps. We can also apply anti-corrosion oil or varnish and use wooden crates for extra protection as per customer requirements.

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Tags : API 7-1 drill collar , slick drill collar , spiral drill collar , AISI 4145H drill collar , drilling collar supplier , weight on bit collar , BHA drill collar , directional drilling collar , MWD drill collar , non-mag drill collar , pony drill collar