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09047 Mechanical and Environmental Evaluation of Two Internal Pipe Coating Systems Used in a 5-inch Drill Pipe

Picture for 09047 Mechanical and Environmental Evaluation of Two Internal Pipe Coating Systems Used in a 5-inch
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Product Number: 51300-09047-SG
ISBN: 09047 2009 CP
Author: Jim Lankford, Jim Feiger, Fengmei Song and Junfeng Fang
Publication Date: 2009
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Pipe internal coatings have been developed and used to improve flow efficiency and corrosion resistance of production lines. Accelerated laboratory tests were performed to evaluate the mechanical and environmental resistances of two commercial coatings used in a 135S 5-inch-OD drill pipe. The parameters evaluated include resistances to torsion, flattening, abrasion, and tension, and resistance of one coating to pipe corrosion in high temperature and pressure brines which: (1) have a high pH, (2) contain CO2, or (3) contain CO2 and H2S. No sign of failure of both coatings was observed after tensile loading test. The wear resistance was below 2.2 liter/µm for both coatings, although the wear patterns after abrasion test were shown to be irregular. After torsional loading and flattening tests, the coatings were shown to have limited degradation, in the form of delamination and disbondment. Examinations of the samples after environmental tests, under 30x optical microscope, showed no coating delamination, while the coating color changed slightly.

Keyword: drill pipe, internal coating, corrosion, production, wear resistance
Pipe internal coatings have been developed and used to improve flow efficiency and corrosion resistance of production lines. Accelerated laboratory tests were performed to evaluate the mechanical and environmental resistances of two commercial coatings used in a 135S 5-inch-OD drill pipe. The parameters evaluated include resistances to torsion, flattening, abrasion, and tension, and resistance of one coating to pipe corrosion in high temperature and pressure brines which: (1) have a high pH, (2) contain CO2, or (3) contain CO2 and H2S. No sign of failure of both coatings was observed after tensile loading test. The wear resistance was below 2.2 liter/µm for both coatings, although the wear patterns after abrasion test were shown to be irregular. After torsional loading and flattening tests, the coatings were shown to have limited degradation, in the form of delamination and disbondment. Examinations of the samples after environmental tests, under 30x optical microscope, showed no coating delamination, while the coating color changed slightly.

Keyword: drill pipe, internal coating, corrosion, production, wear resistance
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