Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Find the plug

17.09.2008
A pressure pulse through a pipeline can locate plugs, saving oil companies lots of money.

More and more oil extraction takes place on the ocean floor –not the easiest place to reach when it comes to maintaining and repairing pipelines that don’t function the way they should. Researchers at the Norwegian University of Science and Technology have developed and patented a new technique called the pressure pulse method for finding plugs in oil pipelines on the ocean floor.

Robots in pipes

Wax deposits are currently the largest unsolved problem in underwater oil production. Oil that is sent from a platform was cooled when it passed through pipelines on the ocean’s bottom; as a result, deposits build up along the pipe’s interior.

Currently, when the flow through the pipe is restricted, the pipeline is shut down, and a robot is sent into the pipe to crawl its way through. Now and then these robots get stuck because they encounter obstructions that are simply too large for them. The operator then has to close off the pipeline and reverse the pressure, so as to get the robot unstuck. Sometimes the robot has to travel a long stretch of pipeline before it finds something to get started on. Both situations can take quite a long time.

Time is money in the oil industry, and lost production time can quickly become a costly affair. If a platform is closed for a longer period of several months because the pipelines are shut down, the costs can top NOK 10-100 million.

Water hammer

Professor Jon Steinar Gudmundsson, who developed the pressure pulse method, explains that he came up with the idea after he observed the shut-down of a geothermal well in Iceland.

”When a well like this is closed with the help of a pressure valve, a pressure wave is created. I realised that this pulse could be used for something constructive,” Gudmundsson explains.

The method is based on a seismic principle and is similar to an echo-sounder: A pressure pulse is sent out and the return signal is measured. “The principle is the same as what we call a ’water hammer’. That’s the bang you hear in a washing machine or a dishwasher when the flow of water to the machine is shut off quickly,” he says.

Mapping with sound

The reflected sound waves from the sound pulses can be measured using complex analytical methods. The measurements can then be used to create a map of the inside of the pipeline, right up to the next pressure vent. Such a map can show where the pipe narrows, and where the deposits are so thick that they plug the pipe. The information helps operators choose the best possible method for clearing the pipe.

Professor Gudmundsson’s idea uses existing installations to measure pressures. The pressure valve is already in place. The only thing that needs to be done is to close the valve quite quickly, which creates the pressure wave.

Markland Technology AS has been spun off of NTNU to sell the method to large oil companies, and has met with considerable success, says Gudmundsson. The business has been developed and licensed by Harald K. Celius.

Jon Steinar Gudmundsson | alfa
Further information:
http://www.ntnu.no

More articles from Process Engineering:

nachricht Quick, Precise, but not Cold
17.05.2017 | Fraunhofer-Institut für Lasertechnik ILT

nachricht A laser for divers
03.05.2017 | Laser Zentrum Hannover e.V.

All articles from Process Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

Cholesterol-lowering drugs may fight infectious disease

22.08.2017 | Health and Medicine

Meter-sized single-crystal graphene growth becomes possible

22.08.2017 | Materials Sciences

Repairing damaged hearts with self-healing heart cells

22.08.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>