Gold Member Since 2016
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Cangzhou Lockheed Petroleum Machinery Co., Ltd.

8′′ Drill Collar, Drill Equipments, Drilling Machinery manufacturer / supplier in China, offering Slick Drill Collar & Spiral Drill Collar with 8′′, Hot Sale Tricone Bit Factory 6 3/4" Inch IADC517 Drill Bit, The 118mm 4 5/8" One-Wheel Bit Supplier From Chinese Factory and so on.

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Supplier Homepage Product drill pipe and drill collar Slick Drill Collar & Spiral Drill Collar with 8′′

Slick Drill Collar & Spiral Drill Collar with 8′′

FOB Price: US $500 / Piece
Min. Order: 1 Piece
Min. Order FOB Price
1 Piece US $500/ Piece
Get Latest Price
Port: Tianjin, China
Production Capacity: 300 Pieces for Each Day
Payment Terms: L/C, T/T, Western Union
Basic Info
  • Model NO.: 8′′ drill collar
  • Size: Large
  • Type: Used Drill Collar
  • Certification: API
  • Application: Well Drilling
  • Trademark: Lockheed
  • Specification: api certification
  • HS Code: 843143100
  • Logo Printing: Without Logo Printing
  • Customized: Non-Customized
  • Material: Stainless Steel
  • Color: Blue
  • Brand Name: Lockheed
  • Transport Package: Wooden Box
  • Origin: Hebei
Product Description
) Description
A drill collar is a device used in the drilling of oil wells for weighting the drill bit, enabling it to drill through rock. It is a bar made of solid steel, either plain carbon steel or a non-magnetic steel alloy, drilled lengthwise to permit the passage of drilling fluids. A drill collar forms the lowest element of a drill string, which encompasses all the elements of a down-hole process from the surface to the rock bit.
 
6) Structure
These devices are typically 31 feet (about 9.45 m) long and threaded at both ends, male at one end and female at the other, to allow multiple drill collars to be joined above the bit assembly.
 
The number of drill collars attached to a drill string will depend upon the material composition of the strata at the drill site and the likely depth of the well. A relatively shallow well with less dense geologic structure through which the bit must pass will require fewer drill collars than a deep shaft through dense material.
 
Typically, drill collars will be consistent in length but may vary in diameter, and their outside configuration may be slick or spiral. The outside diameter may vary from about 3-1/2 inches (8.89 cm) to 11 inches (27.9 cm) and greater. The reference to slick or spiral outer configuration refers to the machining of the outside surface of the collar.
 
7) Parameter

Type
OD(mm)ID(mm)
L(m)
±152.4mm
d

DF(mm)    
±0.4

NC23-31
79.431.89.1476.2
NC26-3588.938.19.1482.9
NC31-41104.850.89.14or9.45100.4
NC35-47120.650.89.14or9.45114.7
NC38-5012757.29.14or9.45121
NC44-60152.457.29.14or9.45144.5
NC44-60152.471.49.14or9.45144.5
NC46-62158.857.29.14or9.45149.2
NC46-62158.871.49.14or9.45150
NC46-65165.157.29.14or9.45154.8
NC46-65165.171.49.14or9.45154.8
NC46-67171.457.29.14or9.45159.5
NC50-70177.857.29.14or9.45164.7
NC50-70177.871.49.14or9.45164.7
NC50-72184.271.49.14or9.45169.5
NC56-77196.871.49.14or9.45185.3
NC56-80203.271.49.14or9.45190.1
6-5/8REG209.671.49.14or9.45195.6
NC61-90228.671.49.14or9.45212.7
7-5/8REG241.376.29.14or9.45223.8
NC70-97247.676.29.14or9.45232.6
NC70-10025476.29.14or9.45237.3
8-5/8REG279.476.29.14or9.45266.7
NC50-67171.571.49.14or9.45159.5

 
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