| 摘要 |
It has been discovered that certain fracturing fluid compositions can be used to fracture a subterranean formation and be permitted to stay within the formation for a relatively extended period of time, for example 2 8 days or more, before being flowed back or produced. At least two embodiments are envisioned, a bacteria-containing formulation and an anti- bacterial formulation. Both systems would be expected to prevent the potential of the fluid to oil wet the formulation (water block condition) by keeping the formation water wet through the use of water wetting surfactants or solvents. Additionally, both formulations would control reservoir crude souring (H2S generation by in situ sulfate-reducing bacteria), reservoir plugging (via slime biopolymers generated by in situ microbes, inorganic sca le deposition like calcium carbonate or barium sulfate, and clay fines migration).
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