Find high quality drill collar with competitive price here. Please rest assured to buy drill collar with China Vigor Drilling Oil Tools And Equipment Co.,Ltd

Vigor Drilling is one of pioneer Downhole Drilling Stabilizers manufacturers in Oil industry. Our Downhole Drilling Stabilizers Drill Collar/Slick Drill Collar/standard Drill collar/Spiral Drill Collar/Non magnetic Drill collar/Drill collar hollow bar, all Drill collars are extra-heavy integral tools used to concentrate weight onto the drill bit for drilling and keeps the drill sting in tension. Mill test certificate conformance to API Spec. 7-1, NS-1, DS-1 and Customer requirements. Our company is the high quality drill collars manufacturers.Slick Non magnetic Drill collar/ Non magnetic Spiral Drill collar/Flex Non magnetic Drill collar, they are function as housing for the MWD tools and provide weight for drilling string.

China Vigor’s Drill Collar/Spiral Drill Collar, materials include AISI 4145H, AISI4145H modified steel and Non-magnetic. Drill collars type they are Spiral Drill collar,Slick,Flex and with Slip and /or Elevator Recess.

Features and Benefits:
1. API stress relief groove pin connection; API Bore back Box Connection.
2. Cold Rolling Thread roots—to improve fatigue resistance of connection.
3. Phosphate coated connections- to prevent corrosion and galling upon initial make-up.
4. A hardness range of 285 to 341 BHN and a Charpy impact value of 40 ft-lbs are guaranteed at evenly distributed 16 points in any sections at room temperature;

Special Features:
1.Spiral Grooving- to avoid differential pressures sticking in the hole.
2.Stress Relief Groove & Bore back Box
3.Hardbanding if required.
4.Slip and Elevator Recess-to improve downhole handling efficiency and safety.

OD		ID		Length mm	Style of connection	Bevel diameter  mm	Bending  strength ratio
mm	in	mm	in
79.4	3 1/8	31.8	1 1/4	9150	NC23-31	76.2	2.57:1
88.9	3 1/2	38.1	1 1/2	9150	NC26-35(23/8IF)	82.9	2.42:1
104.8	4 1/8	50.8	2	9150	NC31-41(27/8IF)	100.4	2.43:1
120.7	4 3/4	50.8	2	9150	NC35-47	114.7	2.58:1
127.0	5	57.2	2 1/4	9150	NC3850(31/2IF)	121.0	2.38:1
152.4	6	57.2	2 1/4	9150or9450	NC44-60	144.5	2.49:1
158.8	6 1/4	57.2	2 1/4	9150or9450	NC44-62	149.2	2.91:1
158.8	6 1/4	71.4	2 13/16	9150or9450	NC46-62(4IF)	150.0	2.63:1
165.1	6 1/2	57.2	2 1/4	9150or9450	NC46-65(4IF)	154.8	2.76:1
165.1	6 1/2	71.4	2 13/16	9150or9450	NC46-65(4IF)	154.8	3.05:1
171.4	6 3/4	57.2	2 1/4	9150or9450	NC46-67(4IF)	159.5	3.18:1
171.4	6 3/4	71.4	2 13/16	9150or9450	NC50-67(41/2IF)	159.5	2.37:1
177.8	7	57.2	2 1/4	9150or9450	NC50-70(41/2IF)	164.7	2.54:1
177.8	7	71.4	2 13/16	9150or9450	NC50-70(41/2IF)	164.7	2.73:1
184.2	7 1/4	71.4	2 13/16	9150or9450	NC50-72(41/2IF)	169.5	3.12:1
196.8	7 3/4	71.4	2 13/16	9150or9450	NC50-77	185.3	2.70:1
203.2	8	71.4	2 13/16	9150or9450	NC50-80	190.1	3.02:1
209.6	8 1/4	71.4	2 13/16	9150or9450	6 5/8REG	195.7	2.93:1
228.6	9	71.4	2 13/16	9150or9450	NC61-90	212.7	3.17:1
241.3	9 1/2	76.2	3	9150or9450	7 5/8REG	223.8	2.81:1
247.6	9 3/4	76.2	3	9150or9450	NC70-97	232.6	2.57:1
254.0	10	76.2	3	9150or9450	NC70-100	237.3	2.81:1
279.4	11	76.2	3	9150or9450	8 5/8REG	266.7	2.84:1

Mechanical Property:
Mechanical Property of Slick and Spiral Drill Collar made of AISI 4145 H

OD Range		Yield Strength(MPa)	Tensile  Strength(MPa)	Elongation  (%)	Hardness  (HB)	Impact           Test(J)
mm	in
79.4-171.4	3 1/8-6 3/4	=758	=965	=13	285~341	=54
177.8-279.4	7--11	=689	=930	=13	285~341	=54