ASP stimulation, or alkali-surfactant-polymer stimulation, is a tertiary enhanced oil recovery technique that is used to improve the recovery of oil from reservoirs.
It involves injecting a mixture of chemicals into the reservoir to decrease the interfacial tension between oil and water, which helps to mobilize and displace the trapped oil.
In the oil and gas industry, ASP stimulation has been used to increase the recovery of oil from mature reservoirs where primary and secondary recovery methods have already been employed. The technique can help to recover more oil from these reservoirs, thereby extending the life of the field and maximizing the economic benefits.
ASP stimulation is typically used in reservoirs with high oil viscosity, low reservoir permeability, and high water saturation. The technique is also used in reservoirs with a significant amount of remaining oil that is difficult to produce using conventional recovery methods.
ASP stimulation involves the injection of a mixture of chemicals into the reservoir, including an alkali, a surfactant, and a polymer. The alkali helps to increase the pH of the reservoir, which helps to solubilize the oil and reduce the interfacial tension between the oil and water.
The surfactant helps to reduce the interfacial tension even further, while the polymer helps to increase the viscosity of the injected fluid, which helps to improve its ability to displace the trapped oil. Overall, ASP stimulation can be an effective method for increasing the recovery of oil from mature reservoirs in the oil and gas industry.
However, the technique can be expensive and complex to implement, and its success depends on a variety of factors, including reservoir characteristics, the type of chemicals used, and the injection process.