Well Configuration Design for Water Alternating Gas

Water Alternating Gas (WAG) is one of the popular EOR techniques to displace oil after natural depletion. Essentially, WAG is a sequential injection of water and gas in specific ratio to sweep oil from the pores. It is a popular technique because of availability of water and gas as well as cheaper cost than chemical injection technique. More importantly, this project discovered that there is a relationship between well configuration design and efficiency of WAG in a 5 spot injection pattern. For example, the ideal WAG ratio of 1:1 that supposedly allows piston-like displacement is not always efficient for all well configurations. Only a horizontal injector and a vertical producer configuration gave the highest oil recovery while the other configurations did not. Ultimately, this project proposed approaches for both new field and mature field. For a new field, one might want to consider well configuration that gives the highest oil recovery to be drilled. On the other hand, for a mature field, the well configuration is already present. Therefore, it is proposed that a WAG scheme that yield the highest oil recovery for that well configuration design should be used

Well Configuration Design for Water Alternating Gas

Water Alternating Gas (WAG) is one of the popular EOR techniques to displace oil after natural depletion. Essentially, WAG is a sequential injection of water and gas in specific ratio to sweep oil from the pores. It is a popular technique because of availability of water and gas as well as cheaper cost than chemical injection technique. More importantly, this project discovered that there is a relationship between well configuration design and efficiency of WAG in a 5 spot injection pattern. For example, the ideal WAG ratio of 1:1 that supposedly allows piston-like displacement is not always efficient for all well configurations. Only a horizontal injector and a vertical producer configuration gave the highest oil recovery while the other configurations did not. Ultimately, this project proposed approaches for both new field and mature field. For a new field, one might want to consider well configuration that gives the highest oil recovery to be drilled. On the other hand, for a mature field, the well configuration is already present. Therefore, it is proposed that a WAG scheme that yield the highest oil recovery for that well configuration design should be used