Abstract:

Taking Shanshan Oilfields in Turpan-Hami Basin as an example, the control of earth stress over fractures was analyzed, and the effect of earth stress on well-net arrangement and waterflooding was studied in low-permeability sondstone oilfield. It is considered that paleo-tectonic stress field was related to the origin, distribution and development of natural fractures; present stress field affects not only the occurrence and validity of natural fractures, but also controls the configuration and extensional direction of artificial fractures. For the reasonable development of low-permeability Sandstone oilfield, the effect of both natural and artificial fractures of present stress field should be considered. In waterflooling, injection pressure should be lower than the formaion forture pressure. The production and injection wells should not he arranged along the directions of natural fractures and the maximum horizontal principal stress.

Key words: tectonic stress field, low-permeability oilfield, natural fracture, artificial fracture