南阿賀鉱山におけるecus井の作井エンジニアリング.

Toward the goal of achieving carbon neutrality by 2050, carbon capture and storage (CCS) is becoming more important as a measure to reduce CO2 emission associated with oil and natural gas development. INPEX corporation jointly with JOGMEC set out plans to drill two new wells in Minami-aga oil field with the following objectives: • to evaluate foam enhanced oil recovery (EOR) technology using foaming agent currently under development; • to investigate potential opportunity of further commercial development of Minami-aga field using CO2-EOR; and • to acquire lessons learnt of field experiences for carbon capture, utilization and storage (CCUS). This presentation describes the conceptual well design of the two wells to be used for huff and puff operation. Fiber cables are designed to be installed behind production casing to acquire data by distributed acoustic sensing (DAS) and distributed temperature sensing (DTS). To avoid damage to the fiber cables, an oriented perforation is planned. Hence, the inclination across the perforation is designed at 30 degrees to assure high and low sides. In completion, a formation isolation valve (FIV) is designed to be incorporated, to eliminate effect of wellbore storage during pressure'build up / fall off recorded by downhole gauge. Unlike surface-controlled subsurface safety valve (SCSSSV), FIVs adopt a fail-as-is feature which cannot close the valve in case of control line failure. Since wells are unable to naturally flow over the period of well life, a SCSSSV is not adopted. The perforation gun with dynamic underbalance is planned to be deployed through the completion. Prior to perforation, wellbore is displaced to underbalance fluid to reduce skin damage. During wellbore clean-up flow and production, gas lift using a coiled tubing or macaroni pipe installed inside the tubing is planned since the wells are unable to naturally flow due to the reservoir pressure depletion. [ABSTRACT FROM AUTHOR]