석유를 뽑아올릴 때 빼낸 기름 만큼 지하 압력이 낮아지는 만큼 물을 채워 압력을 맞추는 역할을 하는 시설이다.
Since underground pressure is lowered as much as the oil that was taken out when the oil was extracted, the facility serves to adjust the pressure by filling it with water.