| 摘要 |
The present invention refers to a foamed inhibited fresh water-based system for perforating wells under control located in fractured or low-pressure formation fields having gradients lower than 1. The main characteristics of the invention are that a liquid foam is easily formed, and density reduced from 1.04 gr/cc to 0.2 gr/cc, thus maintaining stable and homogeneous the aforesaid mixture at a temperature of 150 degree C. The inventive system is maintained flowable, stable and homogeneous by circulating within a well, thereby preventing the circulation loss originated by perforations carried out at depths of up to 5500 m, said system effectively performing the functions of the perforation fluids without risks of polluting the environment since it is diesel-free. The purpose of the present invention is to provide to the well perforation industry, a perforation fluid, which allows low-pressure and fractured oilfields to be effectively, affordably and safely perforated without damaging the expl oitation deposits, and the environment.
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