Seismic assisted flooding processes for oil recovery in carbonates
AssigneeSaudi Arabian Oil Company
InventorsSubhash Ayirala, Abdulaziz S. Al-Qasim, Ali Yousef
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Abstract
An oil recovery method may include injecting 0.05 to 0.25 pore volumes of low-salinity water having 4,000-8,000 ppm of total dissolved solids into a reservoir, and then applying seismic stimulation to the reservoir for a predetermined duration. The steps of injecting low-salinity water and applying seismic stimulation are repeated until 0.25 to 1.0 pore volumes of the low-salinity water has been added to the reservoir. Then, high-salinity water having 35,000 to 57,000 ppm of total dissolved solids is introduced to the reservoir.
Claims18
An oil recovery method comprising:
- (a) injecting 0.05 to 0.25 pore volumes of low-salinity water comprising 4,000-8,000 ppm of total dissolved solids into a reservoir;
- (b) applying seismic stimulation to the reservoir for a predetermined duration;
- (c) repeating steps (a)-(b) until 0.25 to 1.0 pore volumes of the low-salinity water has been added to the reservoir;
- and
- (d) introducing an amount of high-salinity water comprising 35,000 to 57,000 ppm of total dissolved solids to the reservoir.
A method of determining seismic stimulation of a reservoir comprising:
- (a) measuring at least one property of a reservoir;
- (b) determining a seismic stimulation duration for the reservoir based upon the at least one property of the reservoir.
- (c) injecting a volume of low-salinity water comprising 4,000-8,000 ppm of total dissolved solids into the reservoir;
- (d) applying seismic stimulation to the reservoir for the determined seismic stimulation duration determined by the determining;
- (e) repeating steps (c)-(d) until 0.25 to 1.0 pore volumes of the low-salinity water has been added to the reservoir;
- and
- (f) introducing an amount of high-salinity water comprising 35,000 to 57,000 ppm of total dissolved solids to the reservoir.
Dependencies are inferred from the claim text.