orizon Trading Development design is offered in various material configurations for a variety of well conditions. HTD employs leaders in the field of metallurgy and polymer chemistry to ensure superior material recommendations are made to our customers.
For corrosive wells, HTD’s corrosion metallurgists and polymer scientists are available to provide expert material recommendations. To provide the most cost-effective recommendations, the well environment data form has been developed to aid in gathering the necessary well data.
The following alloys and groups of alloys are currently the most common materials used for the construction of packers and related equipment:
- Standard, non-corrosive service–low alloy steels (e.g. 4140) with mechanical properties compatible with API P110 tubulars
- Non-corrosive service containing H2S–low alloy steels (e.g. NACE MR0175 compliant 4140) with mechanical properties compatible with API L80 tubulars
- Corrosive CO2 service with little or no H2S–Martensitic and PH stainless steels (e.g. 9Cr, 13Cr, 17-4PH, alloy 450, Super 13Cr) with mechanical properties that vary from 80 ksi to 110 ksi minimum yield strength; the selection of the specific corrosion-resistant alloy(s) depends on the environment (pH, chlorides, temperature, H2S, etc.,) and strength requirements
- Severely corrosive CO2 and H2S–nickel alloys such as 825, 925 and 718 at strength levels of 110 ksi minimum yield strength and higher
- Severely corrosive CO2, H2S and free sulfur–nickel alloys such as 625 Plus, 725 and, less frequently, C-276 at strength levels of 120 ksi minimum yield strength and higher
For equipment required to perform a temporary function and then allow quick removal by drilling or milling, an additional group of materials is used:
- Cast iron
- Reinforced polymer-based composites
Besides the more common materials, HTD design the packers and related equipment by other materials when raw material availability, quantities, delivery schedules, etc., permit. Example alloys include 316L austenitic, 22 Cr duplex, 25 Cr duplex, 25 Cr super duplex, alloy 20Cb3, 28 Cr super austenitic, K-500 Monel, alloy 2025, alloy 2535, alloy 2550, alloy G-3 and others.
