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96048 SOLID GEL PIGS FOR CLEANING PRODUCTION PIPELINES

Picture for 96048 SOLID GEL PIGS FOR CLEANING PRODUCTION
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Product Number: 51300-96048-SG
ISBN: 96048 1996 CP
Author: Daniel E. Powell, W. Mark Bohon, Gary R. Chesnut
Industry: Oil and Gas Production
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Many oil fields, such as that at Kuparuk, on the North Slope of Alaska, have been built as a trunk and lateral gathering system, with many different pipeline diameters in a branched network. No launchers nor receivers were built for the Kuparuk oil production pipelines. The high cost of retrofitting launchers and receivers prompted investigation of alternative methods for cleaning the pipelines. This paper describes a novel approach to mold solid gelatin pigs in bypass lines, and to run those pigs through the production pipelines to the primary separators. The gelatin pigs would slowly melt, eliminating the need for receivers. Field and laboratory testing showed that gelatin pigs could not effectively clean the pipelines. The addition of cross linking agents could increase the mechanical integrity of the gelatin pigs, but also elevated the melting temperatures above the operating temperatures of the primary separators. As such, they were not meltable (in time), and no benefits could be obtained by the use of solid gelatin pigs for cleaning applications. Keywords: Pigging, Gelatin, Gel Pigging, Crosslink, Cleaning, Production Pipelines, Pipelines, North Slope, Kuparuk, Prudhoe Bay, Alaska

Many oil fields, such as that at Kuparuk, on the North Slope of Alaska, have been built as a trunk and lateral gathering system, with many different pipeline diameters in a branched network. No launchers nor receivers were built for the Kuparuk oil production pipelines. The high cost of retrofitting launchers and receivers prompted investigation of alternative methods for cleaning the pipelines. This paper describes a novel approach to mold solid gelatin pigs in bypass lines, and to run those pigs through the production pipelines to the primary separators. The gelatin pigs would slowly melt, eliminating the need for receivers. Field and laboratory testing showed that gelatin pigs could not effectively clean the pipelines. The addition of cross linking agents could increase the mechanical integrity of the gelatin pigs, but also elevated the melting temperatures above the operating temperatures of the primary separators. As such, they were not meltable (in time), and no benefits could be obtained by the use of solid gelatin pigs for cleaning applications. Keywords: Pigging, Gelatin, Gel Pigging, Crosslink, Cleaning, Production Pipelines, Pipelines, North Slope, Kuparuk, Prudhoe Bay, Alaska

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