How it Works
Postle Industries began trialling our patent pending Spiralbanding Technology in 2017. We have developed new welding techniques and exclusive procedures combined with Duraband® SB welding wire.
Spiralbanding protects the drill pipe tube from wear, significantly reducing drilling costs by increasing the life of the drill string. It has also been shown to 'stiffen' the drill pipe, reducing drag and increasing overall performance.
With the rise in use of extended reach drilling and excessive lateral lengths, the center of the drill pipe body is subject to increased abrasive wear. Drill pipe is being forced into exaggerated compression, causing deflection and unique fatigue dynamics, along with wear in the mid span of the pipe.
Drill Pipe is being downgraded or scrapped due to loss of wall thickness in the center of the tube
This has led to drill pipe being downgraded and/or scrapped prematurely. To get the longest possible life from the unprotected pipe body, pipe owners have been forced to alternate drill pipe lengths between the vertical and lateral sections of the well. This is a time-consuming practice with limited effectiveness. Ultimately, drilling costs increase substantially by regularly replacing drill pipe, which are costs typically borne by the drill pipe owner or their client.
Traditional Welding Challenges
Drill pipe tool joints have been protected from wear for decades, by the application of specially formulated hardband welding materials. These alloys provide a low-friction, abrasion resistant solution to protect both the connections and the casing. The welding process must be controlled to ensure the high temperatures involved do not compromise the strength of the tool joints. This is achieved with the correct procedures being followed on the initial application and subsequent reapplication of hardbanding.
The Heat Affected Zone (the area of base material under and around the weld affected by high welding temperatures) is kept to minimum depth and hardness.
Drill have Pipe Tool Joints been protected by Hardbanding for several decades.
However, the drill pipe body has significantly less wall thickness than the tool joint, which rules out the use of standard hardband welding wires and procedures. Welding onto the tube body in the same way would seriously compromise the integrity of the drill pipe. Simply explained, when welding, the metallurgy of the material directly adjacent to the welded area is altered due to the heat imparted into the part. When the metallurgy is altered on a thin-walled component, the structural capabilities of the original part can be compromised.
Standard hardbanding materials and procedures result in a Heat Affected Zone through the entire wall thickness of the drill pipe body
Various other solutions to protect the drill pipe body have been tried which do not involve welding, but they have proven to be unstable and unreliable.
The Spiralbanding Solution
Postle Industries began trialling our patent pending Spiralbanding Technology in 2017. We developed new welding techniques and exclusive procedures combined with Duraband® SB welding wire. This wire provides the same crack-free, casing friendly, and low-friction wear resistance that Duraband NC hardbanding is well known for. Postle’s Duraband has been the most reliable and trusted hardbanding alloy in our industry for more than 12 years.
Due to the reduced heat input into the drill pipe body with Spiralbanding Technology, the HAZ is reduced significantly, and the adjacent drill pipe body maintains its structural integrity
We have performed a catalogue of third-party laboratory testing to prove Spiralbanding Technology with Duraband SB. It provides a durable, wear resistant alloy deposit to protect the drill pipe body without reducing the metallurgical integrity of the original material. At the same time, Spiralbanding has been used over many drilling hours of downhole testing involving a number of drill pipe owners. Now, after more than three years of development, we are proud to launch Spiralbanding worldwide. A new technology that will save our industry many millions of dollars in drilling costs.
Spiralbanding is typically applied to a 48"-60" long section of the mid-span of the pipe body.
Significant Additional Benefits
Less drag. During testing it was discovered Spiralbanding with Duraband SB actually stiffens the centre of the drill pipe body, reducing deflection of the drill pipe that can translate to less drag. There are numerous benefits yet to be discovered, but there is no doubt this will translate to faster rate of penetration (ROP) and reduced drilling costs.