Abstract
A survey was made to determine how operators in the Texas and Louisiana Gulf Coast area used plastic coated tubing as a means of combating sweet oil well corrosion. Reports were received from some 15 companies. Fields containing a total of 2644 sweet oil wells were included in the survey, of which number some 419 were partially or completely equipped with coated tubing for corrosion protection. Of the coated tubing strings, 309 were coated with baked phenolic, 41 with baked modified phenolic-epoxy, 65 with amine cured epoxy, and 4 with other coatings.
Data are reported showing extent to which the various coatings were used with respect to the salt water content for both flowing and gas lift wells. Also included in the report is a discussion of the use of wire line tools, use of caliper surveys, length of service for various coatings, and types of failure experienced.
It was concluded that coated tubing is an effective and economical way to combat corrosion in sweet oil wells. In general this method of corrosion control is most feasible when the wells produce large quantities of water, when abrasive conditions are encountered due to sand and fluid velocity, or when wells are located in marsh and offshore areas where chemical treatment is inconvenient and expensive. 5.4.5
