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Energy Innovations


rig-count math is based in part on the latest tech- nology of horizontal drilling, which multiplies the number of possible wells attached to each rig. One well may have three to five different horizontal shaſts go- ing off it. Since midyear 2013, for example, North American rig count, which includes all


“It provided a cost-effective solution for deep boring tubing


and casing to depths of 36" [914 mm], even in Inconel, while holding very tight tolerances and excellent surface finishes,” said Scott. “Te QTN-450 with 7.2" [183-mm] spindle bore is the most popular model in the oil patch with bed lengths from 40 to 120" [1016-3048 mm]. With the long boring-bar tailstock, our customers have the capability of processing deep bores in addition to the standard 12-station turret tooled for other part-machined features for maximum flexibility.” Machine tool builders like Mazak and their customers


continue to benefit from close relationships with key OEM suppliers of tooling, workholding and soſtware. “Our VIP tooling partners, for example, have developed new boring bars with different types of materials and designs that keep harmonics from developing and damaging surface finishes,” said Scott. “In the past, prior to having this technology, it wasn’t uncommon for operators and programmers to strap lead weights to boring bars for dampening to minimize chatter during the boring and/or threading process of internal diameters.”


AME engineered the AMLOK hydraulic rod locks for the AZ-10 subsea tree from 4140 steel with electroless nickel plating and a specially formulated two-part epoxy to create a completely sealed unit.


land-based rigs and subsea in the Gulf of Mexico, has pretty much remained on the low end of the 1700 and 1800 range. At the end of November, for example, 1709 rigs in opera- tion would equate to over 9000 wells at about 5.4 wells per rig. Tough the lion’s share of domestic rigs in Texas and the Southwest are single vertical shaſt, converting these vertical shaſt wells over to horizontal drilling dramatically impacts and increases the amount of accessories, including mud pumps, liner casing, cementing tools, packers and mandrels and frack- ing tools, accessories that remain downhole, and, of course, Christmas trees.


Special Boring Option Meets Tubular Needs “We basically ask our customers what would they like to


see on their machine tool to help them do their jobs more ef- ficiently, and we’ll go ahead and incorporate some of their sug- gestions,” said Dana Scott, general manager-Houston Technol- ogy Center, Mazak Corp. (Florence, KY). “A good example resulted from the request of an oil service


OEM customer who asked for the capability to bore very deep holes in tubing. A traditional approach is to put long boring bars on the turret with other required tooling, but then you encounter major tooling interference,” said Scott. Based on the customer’s request, Mazak developed a long boring-bar option mounted on the programmable tailstock for QTN-450 series CNC lathes.


82 Energy Manufacturing 2014 Threading Critical to Integrity


of Heavy Pipe Strings For the all-important threading of drill pipe and casing,


Mazak has developed its PT20 Premium Treading System, which rotates the tool around the part instead of having to rotate pipe that is 30 or 40' (9 or 12-m) long with diameters up to 20" (508 mm) and weights over 18,000 lb (8165 kg). “Tere are two basic thread types in the oil patch: Premium and API threaded connections. Te Premium threads are patented proprietary forms that are used where a very rigid connection and good seal surface are required, especially in deep subsea well applications. Te PT20 system provides accurate cutting of these patented thread forms and seals surfaces fast and efficiently on swedged pipe or casing. By incorporating the Renishaw measuring system to probe the drill pipe’s ID and OD and adjusting for straightness, we can maintain even wall thickness. Another major benefit is changeover from one di- ameter size to the next is 20 minutes rather than three hours,” said Scott.


Emuge Corp. (West Boylston, MA) has introduced an extensive and expanded thread milling program, which in-


Today’s rig-count math is based in part on the latest technology of horizontal drilling, which multiplies the number of possible wells attached to each rig.


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