Secoroc Drill Pipe

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2021年04月08日

CONTERFLUSH DRILL PIPE 4,5” X 3 M WITH INNER TUBE CONNECTOR WITHOUT INNER TUBE

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Drill Pipe





Drill Pipe


Secoroc Drill Pipe catalog page


Secoroc Tubes -- Part of a Productive Package

Though their importance is often underestimated, tubes play an important role in DTH drilling -- regardless of application, rock type, hole depth, or drill rig. The key features of a high quality DTH tube are durability, accuracy, and manageability.



No Weak Links

Traditionally the threads and the joint between the tube and the end-pieces are vulnerable. To combat the problem we've friction-welded the joints for maximum strength and heat-treated the end-pieces for optimum durability.



Never Losing the Thread

Heat-treating the threads ensures not only a long service life, but also simplifies joining and breaking -- thereby cutting cycle time. To meet varying demands, we provide a selection of API threads. For applications where foam injection are used, we recommend the IF thread. Naturally, we also offer a wide range of subs and crossovers -- all made of high quality steel and heat-treated in the same way as tube end-pieces.



High Quality Tubing

Secoroc tubes are made from cold drawn tubing, providing a superior surface finish and tolerance compared to their hot-rolled counterparts. Our solution drastically reduces the risk of scaling -- the cause of so many premature hammer failures.



Pipes From 4-1/2" and Wall Thickness >0.346"

Hot Rolled Grade API J-55


Technical Spec:


Tubing J-55Tool Joints, Adapters
Tensile Strength (RM) min.75,000 PSISurface Hardness58-62 HRC
Yield Strength (ReH) min.55,000 PSIDepth0.080"
Elongation (A5) min.15%Core Hardness32-36 HRC (approx. 300 HB)


Hot rolled tubing fits inside the API N-80 standard, but it has the following shortcomings:


. The hot rolled surface is rough and can release scaling from the inside, which can enter into the hammer and cause severe damage to internal components.

. A rough surface gives higher friction losses, resulting in a higher pressure drop in the drill string.

. Wide tolerance of the wall thickness +/- 10-12%.

. Straightness tolerance not assigned. Must be straightened after welding.

. Production problems due to wide tolerances.



Pipes From 2-3/4" to 4-1/2" and Wall Thickness >0.346"

Hot Rolled Grade API J-55


Technical Spec: 

Tubing N-80Tool Joints, Adapters
Tensile Strength (RM) min.100,000 PSISurface Hardness58-62 HRC
Yield Strength (ReH) min.80,000 PSIDepth0.080"
Elongation (A5) min.18%Core Hardness32-36 HRC (approx. 300 HB)




In order to improve the quality of DTH tubes we are now changing over to cold drawn tubing, and the features and benefits are as follows:


FeatureHot Rolled TubingCold Drawn Tubing
OvalityIncluded in the tolerance for the wallIncluded in the tolerance for the wall
Wall Thickness+/- 10-12%+/- 3-4%
StraightnessN/A0.012"/ft




Benefits in Short of Cold Drawn Tubing:


. Reliable wall thickness

. Less ovality, less risk of eccentric wear

. Better quality of the friction weld, less risk of concentricity of welding

. Better wear resistance due to increased hardness

. Reliable weights max 2-3% variance

. Less risk of damage to the tube from the straightening operation

. An overall weight reduction of our DTH tube assortment

. Still API N-80 standard for tubing



Friction Welding 2-3/4" to 5-1/2" ---- Over 5-1/2" Shrink Fit and Stick Welded


Friction Welding:

. Friction welding is a safe and efficient way to weld the end-pieces on to the tube material. The welding becomes stronger than the tube.

. Friction welding is a combination between friction and pressure.

. The end-pieces rotate with a speed of 480 RPM, and the pressure is between 1,015 PSI and 2,175 PSI depending on the tube diameter and wall thickness.



Friction Welded:

. Friction welding gives much stronger joints, compared with electrode welding, due to less risk of impure joints.




Rotary HeadThe power unit that rotates the drill string.
Spindle AdapterAlso called a "saver sub," threads into the rotary head and drill pipe, protects the threads of the rotary head, considered to be part of rotary head.
Drill PipeAvailable in a variety of lengths, diameters, wall thicknesses, and thread configurations.
Starter PipeSimilar to the drill pipe, always the first pipe in the hole, usually shorter to compensate for the length of the DTH hammer, and with a greater wall thickness to withstand more abrasion as the hole is drilled.
Sub AdapterUsually a short adapter, threaded on both ends in a male/female, female/female, male/male configuration. May be used to increase or decrease the thread diameter or change the thread style as needed for a particular application.
DHT Hammer/ DTH BitThe percussive mechanism that drills the hole. Available in a wide range of diameters and styles depending on the application.
Rotary (Tricone) BitMay take the place of the DTH Hammer and Bit in applications where percussive drilling is not required.


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