The injection of acid gas into underground deep formations requires a compressor. However, the non-ideal behavior of these gases makes them more liquid like when pressurized. How does this behavior affect the compressor power requirements?
Your question is not clear...in any case I would imagine that you will require more power to compress the gas mixture from atmospheric to supercritical conditions.
Reza, its not clear all the objectives and parameters around your activity, you may need compression, refrigeration, and pumps to accomplish the task. Compression to get a significant portion of the increase in gas density, then refrigeration to complete the job of liquification, and pumping to make the final transition from above-ground to below-ground storage... Operating a compressor with the potential to get in to the liquid phase may be very problematic so depending on what density (phase) is required for storage, refrigeration could be a possible option.