Badania kompatybilności wód złożowych z utworów cechsztynu i czerwonego spągowca w aspekcie zatłaczania do warstw chłonnych

The research material were reservoir waters separated in mine installations (well separators located in dolomite formations, Zechstein limestone and Rotliegend sandstones) working in the Polish Lowland. The results of physical and chemical analyses of the research material were used to simulate mixing of various waters. The simulations were made using the AquaChem computer program. Possibilities of carbonate precipitation (Langelier saturation index, Ryznar stability index) and corrosivity (Larson-Skold index) of the analysed waters and their mixtures were determined. The obtained simulation results of mixing water with various physical and chemical parameters were confronted with the results of tests of their compatibility carried out in laboratory conditions. The conducted tests of reservoir water compatibility, carried out in terms of their safe storage in absorbent wells, have shown that waters from deposits in the same reservoir rock are compatible with each other. In the case of mixing waters from different deposits, their incompatibility has been noted many times. It is therefore necessary to perform physical and chemical analyses of mixed waters each time before they are injected. The obtained results will be helpful in undertaking actions aimed at elimination of potential dangers that may occur during injection of water into absorbtive horizons. On the basis of the conclusions resulting from the research, a set of techniques and technologies was proposed that would allow the preparation of extracted reservoir waters for injection. Its guidelines in particular relate to the near-wellbore damage protection of injection well.