Methods and systems to manage impure co2 injection

A method comprising:

• delivering an carbon dioxide injection stream to a first wellhead;
• reducing the pressure of the carbon dioxide injection stream with a first pressure reducer having a depth and producing a reduced pressure carbon dioxide stream;
• reducing the pressure of the reduced pressure carbon dioxide stream with at least a second pressure reducer, wherein the at least second pressure reducer is positioned at a lower depth than the first pressure reducer, and producing a further reduced pressure carbon dioxide stream;
• and
• injecting the further reduced pressure carbon dioxide stream into at least one reservoir having a depth;
• wherein the pressure of the carbon dioxide injection stream at the depth of the first pressure reducer is greater than a bubble point pressure of the carbon dioxide stream at the depth of the first pressure reducer;
• and
• wherein the pressure of the further reduced pressure carbon dioxide stream at the depth of the at least one reservoir is less than a minimum fracture pressure of the at least one reservoir at the depth of the at least one reservoir.

A system comprising:

• a first pressure reducer in fluid flow communication with an carbon dioxide injection stream;
• a second pressure reducer in fluid flow communication with the first pressure reducer, wherein the second pressure reducer is positioned at a lower depth than the first pressure reducer;
• a reservoir in fluid flow communication with the second pressure reducer;
• a controller configured to receive an electrical signal from at least one of a first pressure sensor downstream of the first pressure reducer, a second pressure sensor downstream of the second pressure reducer, and a flow sensor on the carbon dioxide stream;
• and output an electrical signal to control a flow coefficient of the first pressure reducer.