Wells – Processes – Placing fluid into the formation
Patent
1994-09-16
1996-03-19
Novosad, Stephen J.
Wells
Processes
Placing fluid into the formation
1663051, E21B 4325, E21B 4326
Patent
active
054996791
ABSTRACT:
A method of improving oil or gas well productivity from a well penetrating a formation in an oil or gas reservoir, by forming a load fluid by obtaining a hydrocarbon fluid containing a known percentage of aromatics and adding an amount of CO.sub.2 to the hydrocarbon fluid that is determined according to a predetermined miscibility relationship between the CO.sub.2 and the hydrocarbon fluid that establishes the amount of CO.sub.2 required to form a bank of CO.sub.2 ahead of the load fluid in the formation. The load fluid is applied to the well at a pressure such that CO.sub.2 in load fluid within the well bore remains in solution and CO.sub.2 in load fluid within the formation leaks off the load fluid into the formation and forms a bank of CO.sub.2 ahead of the load fluid. The surface pressure is released from the load fluid and the load fluid flows back out of the well. The miscibility relationship between CO.sub.2 and hydrocarbon based load fluids depends on the aromatic content of the load fluid. For high pressure wells, since the amount of CO.sub.2 required becomes excessive, it is preferable to use a load fluid that requires a smaller amount of CO.sub.2 to form a bank in front of the load fluid for a given amount of the load fluid, hence one that has a lower amount of aromatics. The aromatic content of the hydrocarbon fluid is selected according to the pressure required for the well treatment.
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