Massive hydraulic fracturing and re-fracturing jobs have become very popular operations for developing tight oil & gas reservoir and unconventional shale gas reservoir in China. Experiencing long period of production and injection, in-situ pore pressure, stresses and saturation field were significantly changed. Reservoir re-characterization, fracturing modeling and dynamic simulation efforts are necessary to help understand massive re-fracturing impact on production performance and water injection optimization. In this study, a new integrated geomechanics, hydraulic fracturing model and reservoir simulation workflow is formulated and applied to optimize post-frac injection and production in Zhou-6 tight oil block, Daqing field.

With this new workflow, the injection volume of Zhou-6 field was successfully optimized through this more realistic reservoir simulation model. The production of the re-fractured wells was successfully maintained for more than 1 year with the optimized injectivity. The workflow will be widely applicable to other tight oil fields which are involved in massive hydraulic fracturing treatment and water injection development.

You can access this article if you purchase or spend a download.