A novel method for CO₂ injection that enhances storage capacity and security

In this novel proposed injection system, brine is extracted from the target aquifer by means of a lateral horizontal completion located near the top of the formation. An Electrical Submersible Pump (ESP) is used to extract the brine and boost its pressure, before it mixes with CO₂ that is injected down the vertical section of the well. The mixing takes place in the vertical section of the well below the upper lateral. The CO₂ - brine mix is then injected into the same formation in a lower lateral. A down-hole tool would be used to maximise agitation and contact area between CO₂ and brine in the vertical mixing section of the well, which may be 10s to 100s of metres long, depending on the thickness of the formation. here are The advantages: 1.Because the CO₂ is mixed with brine from the formation, there is no overall pressure increase. 2.The extracted brine is already at high pressure when it mixes with the CO₂, greatly increasing the solubility of CO₂ and reducing the volume of brine required. Energy is not expended lifting the brine to surface. Nor is there any concern about handling large volumes of acidic brine in the surface equipment.