Special Features For Drill Collar
Spiral Grooving In order to reduce differential pressure sticking, the surface of drill collars can be spiral-grooved.note 1-Loss of weight is approximatively 4%, compared to slick drill collars. note 2-Length of spiraled section allows reconditionning of connections.
Related products
YTQC Type Drill String Fishing Magnet is one of the auxiliary tools to ensure the normal drilling operation and bottom hole cleaning in the process of downhole accident treatment. The main feature of this product is that it works together with the grinding shoes in the fishing operation, which is different from the previous method of lifting the drill after milling, and then connecting the drill string with the strong magnetic fishing tool to go down the well for cleaning bottom hole , saving a trip down the well operation, which not only saves the drilling cost, but also saves the fishing operation time.
CZJQZ-II 360° Rotation Hydraulic Make/Break unit is designed to safely and efficiently make-up/break-out downholetoolsandmotors. It adopts a unique 360° rotational headstock clamp design. This unit is designed for fast, accurate anddependablemake up and break out of threaded connections. The 360° rotational clamp design greatly enhances the speed andaccuracyofmake-up and break-out of tools.
CZPT-II Hydraulic make-up/break-out platform is mainly used with Make/ Break unit assisting in the pre-assembly of drilling tools, whereby special guiding and alignment of tools are required for proper locking and unlocking of threads during assembly. The precision of tool alignment is the key to fast and accurate make-up and break-out of tools either in the workshop or on the rig. CZPT-II is generally designed to support all types of Make-up/Break-out Unit for its pre-assembly tool alignment and thread guiding. CZPT-II ensures high production efficiency during make- up/break-out of tools.
Stress Relief Groove & Bore Back Box
Stress relief grooves improve bending strength of pin and box connections and, therefore, durability. Stress relief grooves for box and pin are defined by API. Bore back box is a gradual reduction of internal diameter by gradually increasing material cross sectional area at critical section. This will ultimately drastically reduce stress concentration during static / dynamic loading and prevents box connections from failure.
Hardbanding
We provide several hardbanding materials for customer’s choice: Arnco-100xT, Arnco-300xT, TCS-8000; Smooth surface free of tool marks increases flexibility and permits bending without cracking. API Stress-Relief Groove pin Last scratch of box thread covered by pin API Bore Back Box Large radii reduce stress concentrations .
Slip and Elevator Recess
Slip and elevator recesses improve downhole handling efficiency and safety. Slip and elevator recesses are machined in accordance with API 7-1.
Recommended Hardbanding Location
-Drill collars with slip and elevator recesses (ZIP) 4” long wear pad above elevator recess 1” long wear pad above slip recess. 10” long wear pad under slip recess
-Drill collars with slip recess: 10” long wear pad under slip recess, 4” long wear pad above slip recess.
-Drill collars without slip and elevator recesses: 10” long wear pad at 30” from pin shoulder.
