关键词:

吉木萨尔页岩油, 平台井组, 压裂窜扰, 停泵压降曲线, 试井解释

Abstract:

Given the lack of quantitative evaluation methods for frac hits effects，a diagnostic analysis method was developed based on  shut-in pressure drop curve. For the zipper fracturing process of a platform well group，the shut-in pressure drop curves under four typical frac hits modes were identified and used to diagnose frac hits types. Six typical fracturing stages with frac hits of the Jimsar platform A were selected as application cases of the proposed method. The method effectiveness was verified by comparing the application results with the microseismic monitoring results. Moreover，based on the pressure drop well testing interpretation method，the typical shut-in pressure drop curves of two frac hits types in Jimsar，namely the internal frac hits within a new well group，and the  frac hits between new and old well groups，were fitted and analyzed to interpret fracture network parameters. The interpretation results showe that the internal frac hits within a new well group affects the stimulation effects of both the primary and secondary fractures，and the specific hit effects vary with the frac hits types. The frac hits between new and old well groups mainly affects the stimulation effect of primary fractures，resulting in the change of fracture networks from "long and wide" to "short and narrow". Correspondingly，the effective fracture volume is reduced by 28%，and the overall stimulation effect is degraded.

Key words:

Jimsar shale oil, platform well group, frac hits, shut-in pressure drop curve, well testing interpretation