Drill collars

MADE IN DONGYING OIL SUPPLY.
DONGYING,CHINA
SHENGLI OIL FIELD

Drill Pipes, drill collars, drill rigs.

Detailed introduction of the products

Drill collars are manufactured from AISI 4145H or 36CrNiMo4 modified steel, and are supplied in the" as rolled" surface finish condition. Alternative surface finishes can be provided.

Standard size ,bores and connection for drill collars

OD		ID		length mm	Bevel diameter mm	connection style and size	Bending strength ratio
in	mm	in	mm	length mm	Bevel diameter mm	connection style and size	Bending strength ratio
31/8	79.4	11/4	31.8	9150	76.2	NC23	2.57:1
31/2	88.9	11/2	38.1	9150	82.9	NC26(23/8IF)	2.42:1
41/8	104.8	2	50.8	9150	100.4	NC31(27/8IF)	2.43:1
43/4	120.7	2	50.8	9150	114.7	NC35	2.58:1
5	127	21/4	57.2	9150	121.0	NC38(31/2IF)	2.38:1
6	152.4	21/4	57.2	9150or9450	144.5	NC44	2.49:1
6	152.4	213/16	71.4	9150or9450	144.5	NC44	2.84:1
61/4	158.8	21/4	57.2	9150 or 9450	149.2	NC44	2.91:1
61/4	158.8	213/16	71.4	9150 or 9450	150.0	NC46(4IF)	2.63:1
61/2	165.1	21/4	57.2	9150 or 9450	154.8	NC46(4IF)	2.76:1
61/2	165.1	213/16	71.4	9150 or 9450	154.8	NC46(4IF)	3.05:1
63/4	171.4	21/4	57.2	9150 or 9450	159.5	NC46(4IF)	3.18:1
63/4	171.4	213/16	71.4	9150 or 9450	159.5	NC50(41/2IF)	2.37:1
7	177.8	21/4	57.2	9150 or 9450	164.7	NC50(41/2IF)	2.54:1
7	177.8	213/16	71.4	9150 or 9450	164.7	NC50(41/2IF)	2.73:1
71/4	184.2	213/16	71.4	9150 or 9450	169.5	NC50(41/2IF)	3.12:1
73/4	196.8	213/16	71.4	9150 or 9450	185.3	NC56	2.70:1
8	203.2	213/16	71.4	9150 or 9450	190.1	NC56	3.02:1
81/4	209.6	213/16	71.4	9150 or 9450	195.7	65/8REG	2.93:1
9	228.6	213/16	71.4	9150 or 9450	212.7	NC61	3.17:1
91/2	241.3	3	76.2	9150 or 9450	223.8	75/8REG	2.81:1
93/4	247.6	3	76.2	9150 or 9450	232.6	NC70	2.57:1
10	254.0	3	76.2	9150 or 9450	237.3	NC70	2.81:1
11	279.4	3	76.2	9150 or 9450	266.7	85/8REG	2.84:1

(A type、B type)
Mechanical properties of drill collar (Type A or B)

OD of drill collar in	σb Tensile strengt MPa	σ0.20 Yield strength MPa	δ4 Elongation %	Akv Charpy impact J	HB Hardness (Brinell)
3 1/8 --6 3/4	≥ 965	≥ 758	≥ 13	≥ 54	285--341
7--11	≥ 930	≥ 689	≥ 13	≥ 54	285--341

MAGNETIC PROPERTIES OF DRILL COLLAR TYPE C
1* 103*102 /4πA/m时： When MPC=1* 103*102/4πA/m:
μr≤1.010 Relative magnetic permeability μr ≤0.010
Magnetic Field Gradient △B≤0.05μT

MECHANICAL PROPERTIES OF DRILL COLLAR TYPE C

OD		σ0.20 Yield strength MPa	σb Tensile strength MPa	δ4 Elongation %	HB Hardness (Brinell)HB	Akv Charpy impact value J
mm	in	σ0.20 Yield strength MPa	σb Tensile strength MPa	δ4 Elongation %	HB Hardness (Brinell)HB	Akv Charpy impact value J
79.4--171.4	3 1/8 --6 3/4	≥ 758	≥ 827	≥ 18
177.8--279.4	7--11	≥ 689	≥ 758	≥ 20

Spiral grooved drill collors (Type B I ) usual sizes

OD		Ddpth of cut mm	±25.4 Spiral pitch mm	Depth of cut mm
mm	in	Ddpth of cut mm	±25.4 Spiral pitch mm	Depth of cut mm
98.4	37/8	4.0 ±0.79	914
101.6--111.1	4-43/8	4.8 ±0.79	914
114.3--130.2	41/2-51/8	5.6 ±0.79	965
133.4--146.1	51/4-53/4	6.4 ±0.79	1067
149.2--161.9	57/8-63/8	7.1 ±1.59	1067
165.1--177.8	61/2-7	7.9 ±1.59	1168
181.0--200.0	71/8-77/8	8.7 ±1.59	1626	5.6 ±0.79
203.2--225.4	8-87/8	9.5 ±1.59	1727	6.4 ±0.79
228.6--250.8	9-97/8	10.3 ±2.37	1829	7.1 ±1.59
254.0--276.2	10-107/8	11.1 ±2.37	1930	7.9 ±1.59
279.4	11	11.9 ±2.37	2032	8.7 ±1.59
Note:BI sytle drill collar three spiral grooves ,right hand,well distributed.

Size of connection stress-relief features

style of connection	Lx±1.59mm lengh shoulder face of box member	Dcb +0.40 mm -0 Diameter of cylinder area of box member	±20.83mm/m Taper ofarea behind oylinder area of box member	Drc +0 mm -0.79 Diameter of pin member at groove	LRC +0 mm -3.18 lenghshoulder face to groove ofbox member
NC35	82.6	82.15	166.67	82.15	85.73
NC38	88.9	88.11	166.67	89.3	92.08
NC44	101.6	101.6	166.67	106.36	104.78
NC46(4IF)	101.6	106.76	166.67	109.93	104.78
NC50(4 1/2IF)	101.6	117.48	166.67	120.65	104.78
NC56	114.3	121.84	250.00	134.14	117.48
NC61	127.0	132.95	250.00	149.25	130.18
NC70	139.7	152.00	250.00	171.05	142.88
65/8 REG	114.3	134.14	166.67	137.72	117.48
7 5/8 REG	120.7	133.35	250.00	162.72	123.83
8 5/8 REG	123.8	149.25	250.00	184.94	127.00
Note:Connection NC23、NC23（2 3/8IF）and NC31( 2 3/8IF) do not have sufficient metal to accommodate stress-relief feature

Drill Pipe

Heavy Weight Drill pipe

Integral heavy weight drill pipe

Square Kellys

Drill Collars

Skid-Mounted Drilling Rigs

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