Both horizontal and vertical rock stress magnitudes arernsubstantially affected by pore pressure gradients generated byrnproduction from and water injection into low permeable chalkrnfields. This is confirmed by solid mechanics stress analysesrnand by observing fracture propagation in developed fields.rnStress changes generated around horizontal injectors placedrncentrally between two parallel horizontal producers arernconsidered in detail in this paper. It is shown that overburdenrnand sideburden stresses may be altered and controlled tornconfine propagation of fracturing along the length of a centralrnopenhole horizontal injection well. It thereby becomesrnpossible to establish a line drive development based onrninjection of water at fracturing conditions at reduced risk ofrnpremature water breakthrough (patent pending).
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