API Standard and Spiral Drill Collar (Bottom Collar)

• Transport Package: Wooden Box
• Specification: 500*500*500
• Trademark: Lake Petro
• Origin: China
• Model NO.: All kind
• HS Code: 84314310
• Production Capacity: 5000pieces/Year

Product Description

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