When handling austenitic, super duplex & nickel based alloys, special care should be taken to avoid contact with other non-corrosion resistant materials such as contaminated metal inspection tables, metal forks, chains, and cables.
H2S corrosion in the presence of tensile stress may result in catastrophic failure as a result of hydrogen embrittlement by mechanisms such as Sulfide Stress Cracking (SSC) and Stress Corrosion Cracking (SCC).
As completion designs get more complicated, and more reservoirs are completed at one time to reduce capital cost, proper zonal isolation becomes more critical. PBRs are one way of engineering zonal isolation by providing a receptacle for seal assemblies of any length.
Historically, high alloy downhole completion equipment has been manufactured from precipitation hardened “PH” nickel alloy bar stock. Often times, starting with bar, results in significant material loss, additional machining time and costs, and limitations to part lengths when compared to starting with a cold-worked nickel alloy tube.
Drilling hazards resulting from years of historical injection into shallower disposal zones and the necessity to comply with the growing requirements of all regulatory bodies to ensure safe disposal of oilfield brine are driving the need for more critical SWD wells (oilfield brine).
API 5CRA provides detailed testing requirements for satisfaction of the specification. The testing requirements vary by group, or alloy family. This article summarizes the testing requirements for Groups 2, 3 and 4.