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Oil and Gas

Steel pipe decontamination & restoration for the Oil & Gas industry

The need: clean durable pipes

Oil and gas explorations require an enormous quantity of heavy-duty pipes for pumping and drilling reserves.
Because of shortages in high quality pipes and growing costs, GOTAR Technologies has engineered a new generation of cleaning solutions to address the growing need to restore and salvage pipe that has been contaminated with a mixture of bromine and iron oxides. High-grade carbon steel (AISI 4130, 4137, and 4145) is most commonly used in drilling and pumping systems due to the material containing chromium and molybdenum. The material makeup of these drill pipes increases the hardness and elongation, which gives them a higher resistance to crack propagation and increases the ability to deform under pressure without breakage. Unfortunately these materials are still susceptible to corrosion.

Cleaning methods: sand blasting vs chemical cleaning

The challenge is to thoroughly remove the corrosion and deposits without damaging the piping. Sand blasting is a common cleaning method, however, it is very labor intensive and sand abrasives erode the thread profiles and piping surface. Sand blasting also does not allow for cleaning of the interior surfaces of the piping bore. GOTAR Technologies’ cleaning solutions make chemical cleaning a better process for performing pipe cleanings. It can lower labor costs, decrease turn-around time as well as meet the industry’s needs for efficiency, safety and environmental friendliness.

Protection of the equipment being chemically cleaned is always considered due to the risk of hydrogen embrittlement. Hydrogen embrittlement is when hydrogen diffuses into the piping material causing brittleness and causing pre-existing micro fissures to become major cracks. It is common when using sulfuric and hydrochloric acids. GOTAR Technologies has engineered this concern into their cleaning solutions and through testing performed by an independent lab has been proven NOT to cause hydrogen embrittlement.

The solution: chemical cleaning with Gotar D 500

One of the main issues with chemical cleaning, as mentioned above is hydrogen embrittlement. Until now, the
industry had a reason for concern with regards to chemical cleaning, but not anymore. The solutions offered by
GOTAR Technologies are just what the oil and gas industry has been looking for. Bodycote Materials Testing lab performed trials on drill piping samples provided by two major piping manufacturers and the results indicated that no hydrogen embrittlement occurred, even after prolonged immersion in the chemical. Gotar D 500 is biodegradable and non-toxic, enabling safe and efficient cleaning. It presents no health hazards and disposal is easy and hassle free. It has extremely low corrosion rates on steel grades AISI 4130, 4137 and 4145 in the 6-11 mpy (mils per year), when tested to ASTM G31. Soaking drill piping in Gotar D 500 is very effective in removing iron oxide deposits. In addition, field tests have shown that it dissolves bromine, a powerful oxidizing agent that contributes to the plague of iron oxide. The same simple soaking method takes care of both deposits.


The cleaning method and its effects

Cleaning with Gotar D 500 is a simple matter of soaking the pipes in solution filled tanks. Because tens of thousands of drilling pipes may need to be decontaminated as part of day-to-day operations, these tanks should be set up on site, with a few thousand litres per tank. Multiple pipes can be cleaned in as little as 2 hours. Just take a glance at the before and after pictures for conclusive proof that Gotar D 500 is the best solution for immediate results and long-term durability.

Steel Pipe Decontamination for the Oil & Gas Industry.

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