I have few questions regarding Injections wells please:
1- When do we use which type of Injection pattern? Two or three spots patterns are usually used in Pilot phase but what about other well patterns such as four spot, inverted four spot , five spot, Inverted five spot , Seven spot, Inverted seven spot, nine spot & Inverted nine spot etc..
I have been told that its associated with depth of injection wells and amount of oil needed to be swept. And mostly in reservoirs that are not deep enough such wells are drilled.Can anyone comment on this please?? What are operational rule of thumbs regarding this?
2- When do we drill vertical injectors and when do we prefer horizontal or deviated injectors with respect to geological formations and reservoir types?
Normally when we drill a vertical Injector in a high permeability reservoir, we experience Injectivity loss due to water hammering. Can anyone comment on its solution?
In different scenarios how do we counter Injectivity loss?
Thanking you all,