Description

API **1 Drill collar

Description:
1. Material: ***5H/***5Hmod or Non-magnetic.
2. Standard: API**1, NS*1.

A. Slick Drill Collar
Note: Drill collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity. The Drill collar are manufactured strictly from API Spec**1 and SY***1 standard.

B. Spiral Drill Collar
Note: Spiral drill collar is used to reduce contact area with hole so as to avoid efficiently bit sticking from diffirential pressure. The drill collars are manufactired strictly according to API Spec**1 and Standard SY***4.

C. Spiral Drill Collar With Elevator Groove And Slip Groove
Note: Elevator groove and slip groove made on box thread face of slick drill collar or spiral drill collar can be used as lifting sub and safety slip when trip out. The technical parameters for elevator groove and slip groove is as per API SPEC**1. Hardbanding is optional at customers’ requests.

D. Non-magnetic Drill Collar
The as cold rooled finish on both ID and OD surface with unique technical process strengthen the structure and ensures the tools with optimal resistance to stress,corrosion,cracking and the mechanical performance is greatly enganced.

Features:
Drilling collar is at the bottom of drilling string as the main part of bottom hole assembly ,it is designed and manufactured conforming to API standard.
1.Apply drill pressure to drilling bit .
2.Ensure the necessary strength in the circumstances of compression.
3.Lighten the vibration, swing and Run out of drilling bit to make a steady work status .
4.Control well deviation.