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Use of pipeline rifling to decrease corrosion and slug formation

IP.com Disclosure Number: IPCOM000201579D
Publication Date: 2010-Nov-15
Document File: 1 page(s) / 25K

Publishing Venue

The IP.com Prior Art Database


Techniques aimed at reducing corrosion and slug formation in pipelines through the introduction of helicoidal strakes or grooves on the inner surface of the pipeline are discussed.

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Use of pipeline rifling to decrease corrosion and slug formation

Corrosion and slugging formations are common problems in the design and operation of flowlines and pipelines.  Current prevention means include corrosion inhibitors as well as slug catchers.  Inhibitors involve large operating expenditures whereas slug catchers can only be installed at the end of the line.

The proposed invention addresses both problems by the introduction of strakes or grooves on the inside diameter of the line.  The strakes or grooves create a vortex and cause (gas/liquid or liquid/liquid) the fluids to mix, hence mitigating the formation of slugs and slows down corrosion.

Description of technique

For new pipelines, the preferred embodiment of the invention is the introduction of an helicoidal strake on the inner surface of the line or embedded in the coating or liner (see figure).

For existing pipelines, a tool mounted on a pig is envisioned to deposit an helicoidal strake behind it as it travels the length of the pipe or a liner with helicoidal strake or groove may be inserted into the pipe.

Note: Profile of the strakes or grooves (number of helices, height and pitch) should be optimized to mix fluids with minimum pressure drop.