How does polymer flooding work?
Polymer flooding consists of injecting polymer-augmented water into a subterranean oil formation in order to improve the sweep efficiency in the reservoir. The increased viscosity of the water causes a better mobility control between the injected water and the hydrocarbons within the reservoir.
How much polymer should be injected during a polymer flood?
Typically, approximately 1 PV of polymer solution was injected for a given pattern, although a significant amount of variation and experimentation occurred to optimize performance.
What are the limitations or weakness of polymer flooding?
The limits for polymer flooding are respectively that viscosity is lower than 100cp, temparature is lower than 93 centigrade, water salinity lower than 100000ppm, and formation permeability is higher than 20mD.
What is a polymer slug?
Polymer flooding is typically used to improve oil recovery from more viscous oil reservoirs. The polymer is injected as a slug followed by chase water to reduce costs; however, the water is less viscous than the oil.
In which countries chemical flooding is being used?
Chemical flooding in China has become the most major EOR technologies, whose overall level has been ahead of the countries around world. United States and Canada lead the position of gas flooding applications, and gas flooding has a larger proportion in EOR output.
What is surfactant EOR?
Surfactant enhanced oil recovery (EOR) includes surfactant flooding and surfactant stimulation. The main functions of surfactants are to reduce interfacial tension and wettability alteration.
What is ASP flooding?
Alkali-Surfactant-Polymer (ASP) flooding is an enhanced oil recovery (EOR) technique usually performed as a supplement to water-flooding. ASP is a modified form of Surfactant-Polymer (SP) flooding.
What is alkaline flooding?
Alkaline flooding (caustic flooding) is an enhanced oil recovery technique in which an alkaline chemical, such as sodium hydroxide, sodium orthosilicate, or sodium carbonate, is injected during water flooding or during polymer flooding operations.
What is chemical flooding used for?
Chemical flooding uses chemicals to either improve the sweep efficiency or the displacement efficiency of displacing fluids.
What is used for chemical EOR methods?
Conventional chemical EOR methods. The notable conventional EOR chemicals are polymers, alkali, and surfactants. The injection of polymers with waterfloods increases the viscosity of the aqueous phase, and consequently mobility as they move from the injection well towards the producer.
What is ASP polymer?
ASP is a modified form of Surfactant-Polymer (SP) flooding. Both recovery techniques involve the simultaneous, “slug,” injection of a solution consisting of a surfactant and a water-soluble polymer, usually partially hydrolyzed polyacrylamide (HPAM), to improve oil mobility, control, and recovery in a chemical flood.
What is alkaline surfactant polymer flooding?
Alkaline-surfactant-polymer (ASP) flooding is a Chemical Enhanced Oil Recovery (CEOR) method whereby alkali, surfactant and polymer are injected as the same slug. It is one of the most promising world-wide focus of CEOR research and field trials, due to the unique synergy of the three chemical components.
What is IFT reduction?
Surfactants are known as interfacial tension (IFT) reducer additives in enhanced oil recovery (EOR) process. The use of chemical surfactants has always been a challenge due to the high cost of materials and sometimes non-compliance with the environment.
What is IFT in oil?
2.1 Oil–water interfacial tension reduction and emulsification by nanoparticles. Interfacial tension (IFT) is the tendency of a liquid to possess a minimum free surface when it is in contact with another immiscible liquid.
Which one is chemical flooding process?
Chemical flooding is an important tertiary oil recovery technology that can improve oil recovery by adding various chemicals in the injected water. Miscible flooding is an oil displacement method using miscible phase injectant as the displacing agent.
What is the difference between EOR and IOR?
In world oil-and-gas practice, two different terms are in use: EOR (enhanced oil recovery) meaning intensive, forcible methods; and IOR (improved oil recovery) – advanced and moderate methods.