OCTG - Drill Collars

Drill collars are extra-heavy integral tools used to concentrate weight onto the drill bit so as to produce sufficient force for the drill bit to break rock efficiently while drilling. They are made of AISI 4145H modified steel and are connected between drill pipes and drill bits.

Drill collars come in 30 or 31 foot lengths and are furnished as slick (as-rolled surface finish) or spiraled. Spiraled drill collars have grooves on its external surface which maintains an even flow of drilling fluid around the collar to equalize pressure and reduce differential-sticking of the collar to the wall of the oilwell.

Our drill collar connections comply with dimensional requirements specified in API Spec. 7/7-1 and guidelines presented in API RP7G. Drill collars also come with slip and elevator recesses for safe and efficient handling. Slip and elevator recesses can be used together or separately and are machined in compliance with API RP7G guidelines unless otherwise specified.

 
Drill Collars Specifications

Common drill collar sizes are shown in the table below.

Products are manufactured to API Spec. 7/7-1 and API RP7G where applicable and can come customized with additional features and proprietary connections of leading manufacturers per your requirements.

We also offer Pony Collars and Non-Magnetic Drill Collars.

Contact us to discuss your requirements.


Drill Collar Connection Drill Collar Diameter(in) Bore Diameter(in) Length(ft) Linear Weight (Approx.) (lb/ft) Displacement (Open End) (US gal/ft) Bending Strength Ratio
NC 23-31 3-1/8 1-1/4 30 22.00 0.337 2.57:1
NC 26-35 (2-3/8 IF) 3-1/2 1-1/2 30 26.70 0.408 2.42:1
NC 31-41 (2-7/8 IF) 4-1/8 2 30 or 31 33.65 0.515 2.43:1
NC35-47 4-3/4 2 30 or 31 46.81 0.716 2.58:1
NC 38-50 (3-1/2 IF) 5 2-1/4 30 or 31 53.29 0.815 2.38:1
NC 44-60 6 2-1/4 30 or 31 82.61 1.264 2.49:1
NC 44-60 6 2-13/16 30 or 31 75.90 1.161 2.84:1
NC 44-62 6-1/4 2-1/4 30 or 31 90.52 1.385 2.91:1
NC 46 -62 (4IF) 6-1/4 2-13/16 30 or 31 83.81 1.282 2.63:1
NC 46 -65 (4IF) 6-1/2 2-1/4 30 or 31 99.52 1.522 2.76:1
NC 46-65 (4IF) 6-1/2 2-13/16 30 or 31 92.81 1.420 3.05:1
NC 46-67 (4IF) 6-3/4 2-1/4 30 or 31 108.52 1.600 3.18:1
NC 50-70 (4IF) 7 2-1/4 30 or 31 117.52 1.798 2.54:1
NC 50 -70 (4IF) 7 2-13/16 30 or 31 110.77 1.694 2.73:1
NC 50-72 (4IF) 7-1/4 2-13/16 30 or 31 119.81 1.833 3.12:1
NC 56-77 7-3/4 2-13/16 30 or 31 139.90 2.140 2.70:1
NC 56-80 8 2-13/16 30 or 31 150.81 2.307 3.02:1
6-5/8 REG 8-1/4 2-13/16 30 or 31 161.81 2.472 2.93:1
NC 61-90 9 2-13/16 30 or 31 195.81 2.995 3.17:1
7-5/8 REG 9-1/2 3 30 or 31 217.00 3.319 2.81:1
NC 70 -97 9-3/4 3 30 or 31 230.00 3.518 2.57:1
NC 70-100 10 3 30 or 31 242.97 3.717 2.81:1
8-5/8 REG 11 3 30 or 31 299.00 4.574 2.84:1
Standard Features

API Boreback Box Connection

API stress relieve groove pin connection

Cold Rolling Thread roots

Phosphate coated connections

Options

Spiral grooved or Non-Spiral (Slick Type)

Type of Hardband and Hardband configuration

Elevator and Slip recesses or Slip Recess only

Other type of connections to meet specific needs

Protection

Standard Pressed Steel Thread Protectors. Cast Steel Lifting Bail Thread Protectors upon request.

Mill Test Certificates

Issued in accordance with API 7/7-1 and API RP7G specifications.


Third Party Inspection can be performed on request at buyer’s care and expense.

DRILL COLLAR ENQUIRY

Please fill in as many fields as you can in the form below for drill collars enquiry. If you’re unsure, then please leave blank. For multiple product enquiries, please email or call us directly.
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CONTACT

We are open to discussion on the way you might like to structure the deal, payment plans or what you might have in mind.

To talk to us about your requirements now, please contact:

Doreen Ong
General Manager
+65 6505-9206

Alternatively, just fill up our Enquiry Form on the right and we will be in touch with you by the next working day.

News & Highlights


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Please contact us at +65 6505 9200 or [email protected] for a quotation today.