ケミカル攻法による油ガス田操業に係るCO₂排出強度削減の展望について

抄録

Traditionally, much effort has been made by means of “carbon capture and storage（CCS）” and “carbon capture utilization and storage（CCUS）” from the perspective of reducing CO₂ emission as an adaptation for climate change issues in the oil and gas upstream sector. The most typical CCUS in the sector is CO₂ enhanced oil recovery （EOR）. In addition to those efforts, according to a worldwide rise of more rapid response to the issues, the CO₂ emission reducing discussion is expanding to chemical EOR in the last few years. Since a short while ago before the expansion, a core discussion had grown by dealing with CO₂ emission in waterflooding operations because of recognizing higher CO₂ emission intensity due to energy consumption of water treatment, injection, transportation, and disposal. Polymer flooding as a typical chemical EOR can reduce and/or delay water production by improving sweep efficiency. This water reduction can contribute mitigating CO₂ emission. Therefore, this paper recaps state of the art discussion focusing on chemical EOR potentials in the context of reducing CO₂ emission.