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Integrity Management of Oil Wellheads and Flowlines Having Scaling

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Wells in South Burgan field showed increase in water cut with drop in oil production. Some showed scale formation. Fluid sampling, radiography and ultrasonic thickness scanning were done. Recommendations were made for controlling internal corrosion and scaling. Work carried out is detailed.

Product Number: 51317--9323-SG
ISBN: 9323 2017 CP
Author: Abdul Razzaq Al-Shamari
Publication Date: 2017
Industry: Oil and Gas Production
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$20.00
$20.00

The producing wells in South Burgan field Kuwait have recently reported an increase in water cut with simultaneous drop in oil production. Several wells have showed indications of scale formation to varying degrees at the well-head chokes and in the flowlines. Scale deposits comprised mostly calcium carbonate with lesser amounts of silicon (formation fines). Inhibited acid cleaning was carried out to remove the hard scales from the chokes’ beans and sections of the flowlines for wells having significant scale accumulations. Online internal corrosion monitoring coupons were installed on the flowlines to monitor internal corrosion during acid cleaning and routine operation. Similarly scale coupons were installed to evaluate scale inhibitor efficiency. Fluid sampling was carried out during acid cleaning to check dissolved iron (Fe) content as corrosion monitoring indicator and scaling tendency. Radiography was carried out to locate and quantify the scale depositions. Ultrasonic thickness scanning was carried out to ensure integrity of flowline during acid cleaning jobs. Appropriate recommendations were provided to the asset owner for controlling internal corrosion and scaling.Key Words: Integrity scale acid cleaning radiography wells flowlines online corrosion monitoring scale coupons.

Key words: Integrity, scale, acid cleaning, radiography, wells, flowlines, online corrosion monitoring, scale coupons

 

The producing wells in South Burgan field Kuwait have recently reported an increase in water cut with simultaneous drop in oil production. Several wells have showed indications of scale formation to varying degrees at the well-head chokes and in the flowlines. Scale deposits comprised mostly calcium carbonate with lesser amounts of silicon (formation fines). Inhibited acid cleaning was carried out to remove the hard scales from the chokes’ beans and sections of the flowlines for wells having significant scale accumulations. Online internal corrosion monitoring coupons were installed on the flowlines to monitor internal corrosion during acid cleaning and routine operation. Similarly scale coupons were installed to evaluate scale inhibitor efficiency. Fluid sampling was carried out during acid cleaning to check dissolved iron (Fe) content as corrosion monitoring indicator and scaling tendency. Radiography was carried out to locate and quantify the scale depositions. Ultrasonic thickness scanning was carried out to ensure integrity of flowline during acid cleaning jobs. Appropriate recommendations were provided to the asset owner for controlling internal corrosion and scaling.Key Words: Integrity scale acid cleaning radiography wells flowlines online corrosion monitoring scale coupons.

Key words: Integrity, scale, acid cleaning, radiography, wells, flowlines, online corrosion monitoring, scale coupons

 

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