Enhanced petroleum fluid recovery method in an underground reser

Details Enhanced petroleum fluid recovery method in an underground reser Enhanced petroleum fluid recovery method in an underground reser

1996-06-10

1998-06-02

Neuder, William P.

Wells

Processes

Distinct, separate injection and producing wells

E21B 4325

Patent

active

057587272

ABSTRACT:
The method according to the invention is aimed at increasing the efficiency of the conventional enhanced petroleum fluid (O) recovery method (WAG) in an underground reservoir, according to which displacement is achieved towards production wells by means of alternate injections of water slugs (W) and of gas slugs (G) into one or more injection wells. It is characterized in that a substance (alcohol for example) allowing the spreading coefficient (S) to be made negative is added to one or more water slugs. The proportion to be added is selected as a function of the pressure and temperature conditions of the reservoir to be swept. The petroleum fluid to be displaced is distributed in the form of meniscuses that reduce the mobility of the gas and improve the sweep capacity thereof. The method allows to better control the input profile, and a greater and therefore more efficient injection pressure can be used. The method can be used in the field of enhanced oil recovery.

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