API Standard Slick and Spiral Drill Collar (Bottom Collar)

• Customized: Customized
• Surface Treatment: Spray
• Type: Spiral Drill Collar
• Standard: API
• Usage: Oil Mining
• Material: Carbon Steel
• Model NO.: Drill Collar
• Classification: Slick, Spiral, Non-Magnetic
• Transport Package: Standard Export Packing
• Specification: Multiple
• Trademark: MED
• Origin: China
• Production Capacity: 1000000 PCS/Year

Product Description

API Standard Slick and Spiral Drill Collar (Bottom Collar)

Drill collar is a bar made of solid steel, either common carbon steel or non-magnetic steel alloy. It is used in the drilling of oil wells for weighting drill bit, enabling it to drill through rock. Drill collar is the lowest element of a drill string. Our drill collars are manufactured strictly according to API standard.

Slick drill collar has furnished as-rolled surface. Spiral drill collar has grooves machined in its outside surface. The spiral grooves promote even flow of drilling fluid around collar diameter, equalizing pressure and reducing the occurrence of differential sticking.

Spiral drill collar is used to reduce contact area with the hole so as to avoid efficiently bit sticking from differential pressure.

3. Parameters of Drill Collar

Type	OD(mm)	ID(mm)	L(m) ±152.4mm d	DF(mm)    ±0.4
NC23-31	79.4	31.8	9.14	76.2
NC26-35	88.9	38.1	9.14	82.9
NC31-41	104.8	50.8	9.14or9.45	100.4
NC35-47	120.6	50.8	9.14or9.45	114.7
NC38-50	127	57.2	9.14or9.45	121
NC44-60	152.4	57.2	9.14or9.45	144.5
NC44-60	152.4	71.4	9.14or9.45	144.5
NC46-62	158.8	57.2	9.14or9.45	149.2
NC46-62	158.8	71.4	9.14or9.45	150
NC46-65	165.1	57.2	9.14or9.45	154.8
NC46-65	165.1	71.4	9.14or9.45	154.8
NC46-67	171.4	57.2	9.14or9.45	159.5
NC50-70	177.8	57.2	9.14or9.45	164.7
NC50-70	177.8	71.4	9.14or9.45	164.7
NC50-72	184.2	71.4	9.14or9.45	169.5
NC56-77	196.8	71.4	9.14or9.45	185.3
NC56-80	203.2	71.4	9.14or9.45	190.1
6-5/8REG	209.6	71.4	9.14or9.45	195.6
NC61-90	228.6	71.4	9.14or9.45	212.7
7-5/8REG	241.3	76.2	9.14or9.45	223.8
NC70-97	247.6	76.2	9.14or9.45	232.6
NC70-100	254	76.2	9.14or9.45	237.3
8-5/8REG	279.4	76.2	9.14or9.45	266.7
NC50-67	171.5	71.4	9.14or9.45	159.5

 

Mechanical Performance
OD	Yield Strength	Tensile Strength σb	Elongation	Reduction of are	Impact
Size	σ0.2	Mpa(psi)	δ4%	%	Ft.1b
	Mpa(psi)
3 1/8~6 3/4	≥758	≥827	≥18	50	≥50
	-110,000	-120,000
7~10	≥689	≥758	≥20
	-100,000	-110,000

Our team
Zhengzhou Maierda Petroleum Equipment Co., Ltd., located in Central China, is a professional supplier of oilfield equipment and tools.
Our factories has more than 15 years experiences of manufacturing oilfield equipment and tools.
Our sales team has more than 10 years importing exporting experiences in oil & gas industry.
Our products
We are specialized in such as casing centralizers, float collars and float shoes, cementing plugs, cement baskets, cementing heads, stage collars, sucker rods, drill pipes, drill collars and pumping units
our products are well sold in Mideast, North America, Latin America, Central Asia, Southeast Asia, Russia, North Africa, etc.

We are committed to providing high-quality and cost-effective products and services to our customers.
Our services
We guarantee and uphold the highest standards in customer service, client satisfaction, and quality product delivery in the oilfield industry. We are professional in many kinds of casing centralizers, float collars and float shoes, cementing plugs, cement baskets, cementing heads, stage collar, sucker rods, drill pipes, dill collars, etc.
Let's join hands and work together to create a better future!