Prevent Stagnation Zones during Injection to Improve Contact Efficiency
Figure 1. Simulated EOS Pro distribution in biobarrier during simultaneous injection.
Luckily, there is a simple method to solve this problem. Split the wells into two groups, with every other well in Group A, and the remaining wells in Group B. Inject into all the wells in Group A first, then inject into the Group B. During the Group A injection, stagnation zones will develop midway between the A wells, where the B wells are located. During injection into the B wells, EOS Pro will be distributed throughout the stagnation zone. Figure 2 shows simulated contact efficiency for a biobarrier in a heterogeneous aquifer versus pore volumes of dilute emulsion injected. Switching from simultaneous to alternating injection can increase contact efficiency by up to 10% with little additional cost.
Figure 2. Simulated EOS Pro contact efficiency for simultaneous and alternating injection of biobarrier wells.
For more ideas on how to improve contact efficiency and reduce costs, check out the article on Emulsified Vegetable Oil (EVO) for Anaerobic Bioremediation on ENVIRO.wiki.
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