| Popis: |
In high pressure high temperature (HPHT), deep sour gas condensate and volatile oil fields, in which the wells contains approximately 2 – 8 % H2S and 1 – 2.5% CO2 it is necessary to evaluate the corrosion rates for the downhole completion string. As it is well known that, corrosion leads to several major problems which affect the well integrity and the production sustainability through the production string failures and tubing casing pressure communication. The purpose of this paper is to illustrate an initial monitoring plan to extend the life of a completion string, reduce the number of well interventions and workovers due to corrosion and scale deposition. This systematic approach will improve the future tubing selection criteria and evaluate the need for CRA material also enhancing the downhole inhibition system with reference to KOC safety regulations from operational and economical prospective. The conclusions of the above will be based on data collected from 13 wells to investigate the key factors which accelerate the corrosion occurrence and rate. As such, a detailed analysis was constructed by using the baseline corrosion logs and their outputs such as time lapse, pitting, and fluid properties vs. metallurgy. |
