The Downhole Coupon Holder Assembly (DCHA) was developed to test the effects of different types of corrosion on downhole tube materials, including general corrosion, crevice corrosion, stress corrosion, and pitting in downhole conditions.
The DCHA holds up to nine coupon holders, including Bent Beam, Strip, and Cylindrical. The three type of coupon holders can be “mixed and matched” according to the type of corrosion effects you are evaluating.
The DCHA is normally used conjunction with the DCMS Downhole Tool, but may also be installed separately. If more than nine samples are required, multiple DCHAs may be mated together.