Feasibility of new technological transformation for Chang 81 reservoir of Zhenyuan oilfield in Ordos Basin, China

With the scale development and westward blocks of the Chang 81 reservoirs, the poor properties, and the significant reduction of single well producing test, the reservoir reconstruction is needed to improve the volume and fracture conductivity and then improve the production of single well. According to Chang 81 reservoir characteristics and with reference to the reconstruction outcomes and experiences of the Chang 6 reservoir reconstruction technology in the Huaqing oilfield, Ordos Basin, the new technologies, such as multiple-stage fracturing technique in deviated wells, oriented perforating, mixed water volume fracturing, are used to transform and adapt the reservoir, and good results have been achieved. The multiple-stage fracturing technique in deviated wells increases 13. 69% production for a single well. The oriented perforating increases 19. 09% production for a single well. The mixed water volume fracturing has the most significant production for a single well, up to 242%. The field test proves that the technology is of great significance in improving the development effects of super-low permeability reservoirs.