The Casing Double Pin Drill
In our previous blog we told you about our band saw and how it performed during workshop trials. This time we take a look at the DDU1636 double drill unit which was also designed by the Mirage team for offshore decommissioning projects.
In 2012 the Mirage DDU was runner-up product at the World Oil Awards on the ‘Health, Safety, and Environment / Sustainable Development Offshore Award’ category.
The machine is mostly used for drilling lifting holes into casings, which can then be severed using a portable band saw and lifted out of position. The robust construction and carbide tipped cutters makes it an ideal tool for cutting through different materials as used in cemented casing strings.
How it works
The DDU’s positioning legs are screwed until equally spaced from the internal bore and then are backed off 5mm. The swing pin is removed from the frame allowing the unit to swing open for mounting onto the casing. The drill is then positioned where the cut needs to be made, the swing pin reinstalled and the legs tightened.
When the unit is secure, the carbide tipped cutter heads (from 4” to 12” diameter) can be attached to the spindles ready for drilling.
The cutters are usually fed manually at an even rate and with equal pressure. An optional conversion kit is available for use in situations where an automatic feed is needed.
At the Mirage factory we recently carried out pre-use function check on a DDU. View the video above to see how it performed.
DDU1636 Trial: Technical Details
- Item to drill: 30” mild steel pipe
- Cutter used: 4” diameter carbide tipped. (The machine can be specified with cutter, mandrel and steady packages up to 12” diameter).
- RPM for this trial: 30
- Feed rate: 4mm per revolution
- Feed type: manual
- Drilling time: 5 minutes