Slick Drill Collar Manufacturer,Drill Collar Supplier

A.Slick 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 Spec7-1 and SY5411 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 Spec7-1 and Standard SY5144
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 SPEC7-1. 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.

MAGNETIC DRILL COLLAR

Slick and Spiral Drill Collars
according to API Spec 7-1
NS1 and DS1 properties
4145H Material
Stress Reflief Groove
SRG on PIN
Bore Back on Box
Connections Phospatized
Cold Roll on Threads to improve
fatigue resistance
Thread Protectors
Pony Drill Collar available
 

Product Details

• First class equipment could guarantee the whole process flow and the clave process be more efficient like heat treating and friction welding.
• Meet the international requirement of the API 5DP, API 7G, & ISO 9001;
• Advanced and strict inspection instruments could guarantee the high quality product with a more stable performance.
 

Features of Drill Collar

Superior-quality green pipe&Advanced heat treatment process-High Strength& high toughness(especially under low temperature).
To meet or exceed requirements of the API 7-1,API 7G&IS09001.
Equipped with advanced inspection instruments and a strictly enforced quality controlling system,the final products are guaranteed to be of superior and stable quality.
Due to our professional technicians&product flexibility,we are capable of meeting some customer' s specific requirements.

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 SIZES