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Design of regulated velocity flow assurance device for petroleum industry

by Yardi, Chaitanya Narendra

Abstract (Summary)
The petroleum industry faces problems in transportation of crude petroleum be-

cause of the deposition of paraffins, hydrates and asphaltenes on the insides of the

pipeline. These are conventionally removed using either chemical inhibitors or mechani-

cal devices, called pigs, which travel through the pipeline and mechanically scrape away

the deposits. These pigs are propelled by the pipeline product itself and hence travel at

the same velocity as the product. Research has indicated that cleaning would be better

if the pigs are traveling at a relatively constant velocity of around 70% of the product

velocity.

This research utilizes the concept of regulating the bypass flow velocity in order to

maintain the pig velocity. The bypass flow is regulated by the control unit based on

the feedback from the turbine flowmeter, which monitors the bypass flow. A motorized

butterfly valve is used for actually controlling the bypass flow.

In addition to cleaning, the proposed pig utilizes on-board electronics like accelerom-

eter and pressure transducers to store the data gathered during the pig run. This data

can then be analyzed and the condition of the pipeline predicted.

Thus, this research addresses the problem of designing a pig to maintain a constant

velocity in order to achieve better cleaning. It also helps gather elementary data that

can be used to predict the internal conditions in the pipe.

Bibliographical Information:

Advisor:Langari, Reza; Parlos, Alexander; Bollfrass, Charles; Toliyat, Hamid

School:Texas A&M University

School Location:USA - Texas

Source Type:Master's Thesis

Keywords:offshore pipe cleaning pig smart petroleum oil velocity regulated constant

ISBN:

Date of Publication:12/01/2004

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