Steam flooding intensifies subsidence at Wilmington field

Water-injection pressure maintenance may slow and ultimately arrest land subsidence in the Wilmington field in California by reducing the potential gradient that drives fluid out of the siltstones. The issue, however, is how to manage the water-injection program effectively to stop subsidence while continuing to produce oil from the reservoir.Compaction of these low-permeability sediments increases pore pressure that dissipates slowly, resulting in gradually increasing land subsidence for a prolonged period.Thermal compaction of the Du and D2 siltstones caused the surface subsidence in the Tar zone steamflood area, according to both laboratory rock compression tests and thermal decay (TDT...

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