PROPERTIES OF ANTI-FORMATION OF SCALE AND WAX FOR THE ORGANIC COATING IN HIGH TEMPERATURE AND HIGH PRESSURE ENVIRONMENT

Through lab simulating testing of the scale formation and wax formation on the inner wall of pipelines for injecting water and transporting oil in Karamay Oilfield,the difference of scale formation and wax formation on the inner wall of pipelines before painting and after painting was studied.After painting solvent-free epoxy coating named YH-16 made in China and Powercrete coating made in USA on the inner surface of pipelines,the quantity of wax deposition on both coatings was quite similar.The quantity of wax depositiong on the coating surface was 14.7% for YH-16 and 16.7% for Powercrete respectively,and the quantity of scale deposition on the coating surface was 28.9% for YH-16 and 27.6% for Powercrete respectively.The scale formation on bare metal surface was compact and difficult to be wiped off,the scale formation on coating surface was loose and easy to be wiped off.