Drill Collar_Drilling Tools_Product_陕西思泉机械设备有限公司

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Drill Collar

Source：SIQUAN|[ 2014-03-05 ] Hits：1259

Drill Collar is the basic component in the BHA which provides weight on the bit for drilling and keeps the drill string in tension.

It is manufactured from 4145H modified quenched and tempered steel, strict metallurgical specifications are followed to insure that full length heat treating produces a consistent maximum depth of hardness.

Features and Benefits

●A hardness range of 285 to 341 BHN and a Charpoy impact value of 40 ft-lbs are guaranteed at evenly distributed 16 points in any sections at room temperature;

●Connections are completed（phosphate coated）to protect them from the elements after machining and to help prevent galling upon initial make-up;

●Thread roots are cold rolled on API and H-90 connections;

●Pressed steel thread protectors are supplied for all drill collar that are equipped with standard connections.

When ordering Please specify:

●Drill collar OD and ID;

●Overall length;

●Connections required (size and type);

●Special features desired, for example:

Slick or Spiral;

Stress Relief Features;

Slip and/or Elevator Recess;

Hard banding;

Specifications:

Number and connection table	Outside Diameter		Inside Diameter		Length mm	Bevel Diameter mm	Bending Strength Ratio
Number and connection table	mm	in	mm	in	Length mm	Bevel Diameter mm	Bending Strength Ratio
NC23-31	79.4	3 1/8	31.8	1 1/2	9150	76.2	2.57:1
NC26-35(2 3/8 IF)	88.9	3 1/2	38.1	1 1/2	9150	82.9	2.42:1
NC31-41(2 7/8 IF)	104.8	4 1/8	50.8	2	9150	100.4	2.43:1
NC35-47	120.6	4 3/4	50.8	2	9150	114.7	2.58:1
NC38-50(31/2IF)	127	5	57.2	2 1/4	9150	121	2.38:1
NC44-60	152.4	6	57.2	2 1/4	9150 or 9450	144.5	2.49:1
NC44-60	152.4	6	71.4	2 13/16	9150 or 9450	144.5	2.84:1
NC44-62	158.8	6 1/4	57.2	2 1/4	9150 or 9450	149.2	2.91:1
NC44-62(4IF)	158.8	6 1/2	71.4	2 13/16	9150 or 9450	150	2.63:1
NC44-65(4IF)	165.1	6 1/2	57.2	2 1/4	9150 or 9450	154.8	2.76:1
NC44-65(4IF)	165.1	6 1/2	71.4	2 13/16	9150 or 9450	154.8	3.05:1
NC44-67(4IF)	171.4	6 3/4	57.2	2 1/4	9150 or 9450	159.5	3.18:1
NC50-67(41/2IF)	171.4	6 3/4	71.4	2 13/16	9150 or 9450	159.5	2.37:1
NC50-70(41/2IF)	177.8	7	57.2	2 1/4	9150 or 9450	164.7	2.54:1
NC50-70(41/2IF)	177.8	7	71.4	2 13/16	9150 or 9450	164.7	2.73:1
NC50-72(41/2IF)	184.2	7 1/4	71.4	2 13/16	9150 or 9450	169.5	3.12:1
NC56-77	196.8	7 3/4	71.4	2 13/16	9150 or 9450	185.3	2.70:1
NC56-80	203.2	8	71.4	2 13/16	9150 or 9450	190.1	3.02:1
6 5/8 REG	209.6	8 1/4	71.4	2 13/16	9150 or 9450	195.7	2.93:1
NC61-90	228.6	9	71.4	2 13/16	9150 or 9450	212.7	3.17:1
7 5/8 REG	241.3	9 1/2	76.2	3	9150 or 9450	223.8	2.81:1
NC70-97	247.6	9 3/4	76.2	3	9150 or 9450	232.6	2.57:1
NC70-100	254	10	76.2	3	9150 or 9450	237.3	2.81:1
8 5/8 REG	279.4	11	76.2	3	9150 or 9450	266.7	2.84:1
Slips and elevator grooves can be produced upon the customers' requirement.