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API Drill Collar

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Dongying Lake Petroleum Technology Co.,Ltd
[China]

Address
Huatai International Financial Center,No.1188Lushan Road  Dongying Shandong
Phone
86-546-7080021
Contact name
Zang Qinglin

Quick Information

  • Brand Name: LAKEPETRO
  • Place of Origin: China
  • SIZE : 3 1/8in to 11 in
  • Material : 4145H

Description

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.

 
Drill Collars Specifications

Common drill collar sizes are shown in the table below.

Products are manufactured to API Spec. 7/7-1 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.


When ordering or requesting quotations for drill collars, please specify the following :

  1. Collar Outside Diameter (OD).
  2. Drill Collar Bore (ID)
  3. Length of Drill Collar
  4. Size, type and location of connections,Eg: NC 50 BOX Up x NC 50 PIN Down
  5. Slick or Spiral
  6. Cast or Pressed Steel Thread Protectors
  7. Special Optional Features as desired – slip and / elevator recesses and / hardband type.


Price

  • Price Condition : FOB
  • Price : USD800 / Rod
  • Delivery Port : Qingdao,Shanghai,Tianjin

Packaging & Delivery

  • Packing :Standard Export Package
  • Delivery Lead Time : 30days for ready goods,up to quantity
  • Minimum Order : 10
  • Supply Ability : 5000 rods per month

Product Image

  • API Drill Collar image

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