METHODS FOR INCREASING THE RECOVERY RATE OF A HYDROCARBON FROM AN UNDERGROUND RESERVOIR

摘要

Methods for increasing the recovery rate of hydrocarbons from an underground reservoir. The methods involve injecting into the reservoir a first acid solution at a sufficient concentration to stimulate flow of the hydrocarbon in the reservoir, wherein the concentration of the first acid solution minimizes matrix acidizing and/or acid fracturing of the reservoir. The concentration of the first acid is sufficient to increase the hydrophilicity of the surface formations present in the underground reservoir, which stimulates the flow of hydrocarbons in the reservoir. The first acid may interact with connate water and form a second, stronger acid in situ.