What studies have been done that demonstrate the relative corrosion resistance of common casing and screen steels?
A3. A recent study was conducted by Geoscience Support Services that compared the corrosion rates of 5 commonly steels used in the manufacture of well casing and screens. The steel types included 316L and 304 stainless steels, corrosion resistant, high-strength, low-alloy steel (ASTM A 606 Type 4), copper-bearing steel, and mild steel. Coupons prepared from each of the steels were placed in an inactive production well which had been removed from service due to problems related to corrosion. Three sets of coupons were placed in the well and were removed at various time intervals over an eleven month (1998 – 1999) test period. The coupons were then weighed and the corrosion rates for each type were calculated. The test results are shown on the table below along with relative cost comparisons.
