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Oilfield Technology: The Perfect Machining of Threads On Delivery Pipes and Casings

Whether we are talking about North America, Asia or Russia, within the oil and gas industry, there is a spirit of optimism. Geological discoveries have led to a massive increase in the estimated reserves in many countries. Along with these discoveries, the potential for the use of innovative technologies has also increased. According to the expert estimates, oil production in the Gulf of Mexico alone will rise from the present 1.3 million to 1.7 million barrels a day during the next decade, with demands for the highly sophisticated technological equipment required to accomplish it increasing as well. Two examples are delivery pipes and casings.  To create the connection safely and in perfect alignment depends on the threads on the pipe ends. With its USC turning machines, the specialists from EMAG Leipzig have not only created a tool that specializes in this application – and one that has perfected the production sequence for these threads – but also developed complete solutions that guarantee component quality and process integrity.

Specially optimized for the thread cutting of delivery pipes and casings: the USC series of machines from EMAG

Specially optimized for the thread cutting of delivery pipes and casings: the USC series of machines from EMAG

Economic key performance indicators for suppliers to the oil and natural gas industry change rapidly. An impressive example of this is found in the USA. The USA hopes to reduce its dependence on oil imports and instead invest heavily in new technology. An indicator, for the US, are imports of equipment technology for the American oil and gas industry, which the U.S. Department of Commerce for 2012 show an increase of 33 percent, compared to the previous year. The experts also expect a production boom in South America and Asia. For Brazil, the foreign trade experts at Germany Trade and Invest (GTAI) predict a “high level of growth in new reserves“. And on the other side of the globe, the investment volume in the oil and gas sector of Vietnam alone has reached 40 billion USD, according to GTAI.

Frank Schiffler, Head of Sales at EMAG Leipzig Maschinenfabrik: “We design all-round solutions. In addition to that, we have available a comprehensive service network. The two together guarantee the economic success we enjoy among our clientele.“

Frank Schiffler, Head of Sales at EMAG Leipzig Maschinenfabrik: “We design all-round solutions. In addition to that, we have available a comprehensive service network. The two together guarantee the economic success we enjoy among our clientele.“

The experts at EMAG Leipzig are aware that this extraordinary dynamic has a direct impact on the production of the required technology. For decades, the machine builders at Leipzig have been specializing in the machining of delivery pipes and casings for the oil and gas industry. Many users can no longer do without their special know-how in demanding thread production. Frank Schiffler, Head of Sales, fills us in on the background: “We are talking about a gigantic production output. One steel mill produces up to 2 million metric tons of pipes per annum. Component quality is paramount for these because the pipe threads have to be totally leak-proof and must carry the enormous total weight of pipe and oil during the delivery. The machining centers used must ensure that the quality and efficiency of the threads produced is 100%.”

Flexible solutions for the production of pipes

The flexible loading of the workpieces is designed specifically for the customer and fully automated. The transport system does not need to be reset and adjusts itself to individual tasks and workpiece dimensions

The flexible loading of the workpieces is designed specifically for the customer and fully automated. The transport system does not need to be reset and adjusts itself to individual tasks and workpiece dimensions

The USC series from EMAG Leipzig Maschinenfabrik represents an extraordinary, sophisticated solution for this particular production requirement. Flexibility is very important in the construction of these turning machines. Not only do the different machine sizes allow for the complete-machining of different sizes of pipes with external and internal threads to API and GOST standards, they can also cut all proprietary threads. “The larger oil field technology producers have their own thread standards.  We can adjust our machines perfectly to their demands“, explains Mr. Schiffler. For instance, all workholding and centering equipment is configured to suit individual requirements. The same applies to all automation components. As a result, the customer has an extremely fast production solution that automatically loads and unloads the components in 12 to 20 seconds (depending on pipe size and thread type), then carries out the 3-part threading process – from facing to chamfering and finally threadcutting. The output ratio therefore increases enormously, compared with that of traditional turning machines.

These machines handle an enormous amount of pipe material and are made to perfectly suit manufacturer’s individual requirements. The threading process itself takes just 12 to 20 seconds

These machines handle an enormous amount of pipe material and are made to perfectly suit manufacturer’s individual requirements. The threading process itself takes just 12 to 20 seconds

However, there are two important factors that must be taken into account when machining threads on delivery pipes and casings: processing quality and process integrity. The quality is guaranteed by a perfectly adjusted machine, with proven EMAG technology and the know-how of the speciality machine builders from Leipzig come together. The whole process benefits from the following important design details:

  • The machine base is made with Mineralit (a polymer concrete) and guarantees the stability and the vibration-resistance of all machine components.
  • The main drive forms an integral part of the spindle unit. Its frequency-controlled, maintenance-free AC asynchronous motor provides a high torque rate, which allows for the simultaneous machining of both ends of the pipe.
  • The pipes are safely clamped in front and rear chucks that – depending on workpiece requirements – can be actuated pneumatically, hydraulically or mechanically.
  • The pipe ends are stabilized during the machining process by the insertion of vibration-reducing mandrels, resulting in the highest possible precision.
The USC series offers great rigidity, preloaded linear guideways and dampening clamping systems that together ensure the production of thread profiles as smooth as glass

The USC series offers great rigidity, preloaded linear guideways and dampening clamping systems that together ensure the production of thread profiles as smooth as glass

“This quality is a feature of all our USC series machines,” acknowledges Mr. Schiffler. Depending on the machine used, the max pipe diameter can be any dimension from 2⅜” to 20”.

Complete solutions guarantee process integrity

When faced with high production rates, fast machining processes and expensive pipe blanks, machine downtimes are particularly costly for the manufacturer. For this very reason, the process integrity of these machines is another key development area in Leipzig. “We design complete solutions for our customers, who – in turn – benefit from the quality of the EMAG components“, explains Mr. Schiffler. “In addition to that, we integrate, for instance, measuring stations, crack detection equipment, embossing and plating units and, of course, a monitoring system that covers all components. At the end, what we supply is a production system that guarantees the greatest possible degree of process integrity.“ Of similar importance in this context is the worldwide service presence of the specialists. Not only are both user and maintenance staff trained to perfection, a 24-hour 365-day telephone service is also available. This ensures that possible machine downtimes are reduced to an absolute minimum.

The two compound slides with 4-position table-type turrets of EMAG design accommodate a number of different tooling systems. The various quick-change toolholders hold tools for external and internal turning operations. The compound slides are subject to high rapid traverse speeds in X- and Z-axis and ensure idle times are kept short. The guideway system for the slide unit features pre-loaded linear roller guides for greatest machining accuracy and high dynamics

The two compound slides with 4-position table-type turrets of EMAG design accommodate a number of different tooling systems. The various quick-change toolholders hold tools for external and internal turning operations. The compound slides are subject to high rapid traverse speeds in X- and Z-axis and ensure idle times are kept short. The guideway system for the slide unit features pre-loaded linear roller guides for greatest machining accuracy and high dynamics

Projects from A to Z

How do the special machine manufacturers assess their market opportunities over the next few years? Mr. Schiffler’s judgement on the market’s dynamic is a positive one: “We already are the market leader in machines for the threading of oil and gas pipes; and we intend to further extend this position.“ One formula for success in this field is the famous “Made in Germany“ – which is a sign for quality. Over 70 percent of the machine components are made and assembled at EMAG in Germany. Every customer comes to Leipzig for the machine acceptance, where the first test run, using the actual pipe blanks, is carried out. Only then will the machine be installed at the production site. “Our particular quality of service kicks in long before the machine is built, or the central claim made by EMAG Leipzig would not be a valid one. Our name stands for projects that are carried through to perfection from A to Z, and that represent all-round solutions.“

See the USC series in action HERE.

For more information:

Kristal Kilgore
EMAG LLC
38800 Grand River Avenue
Farmington Hills, MI 48335
Tel: (248) 875-0313
Fax: (248) 477-7784
E-mail: kkilgore@emag.com
Web: www.emag.com

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