1887

Abstract

Summary

The deposition of inorganic salts in the bottomhole formation zone and on the surface of the oilfield equipment causes a reduction in the well production rate, service life and the rock permeability. The precipitation of calcium sulfate often occurs when mixing incompatible waters during waterflooding of reservoirs. In this work, conditions for the precipitation of calcium sulfate were determined depending on the reservoir conditions and the volume ratio of the injection and formation waters. The effects of reservoir temperature and pressure on the formation of calcium sulfate scale were studied. The results of scale prediction showed that with increasing temperature and decreasing pressure, the amount of forming calcium sulfate is significantly increased. To analyze the inhibition efficiency of calcium sulfate under static conditions, five different scale inhibitors were used. Results of studies on the evaluation of the efficiency of the developed scale inhibitor and industrial scale inhibitors under static and dynamic conditions were presented. The developed scale inhibitor has the highest efficiency for preventing the calcium sulfate scale formation at a concentration of 30 mg/L. Despite the decrease in solubility of calcium sulfate with increasing temperature, the effectiveness of the developed inhibitor does not significantly decrease with increasing temperature.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201800117
2018-04-09
2024-03-28
Loading full text...

Full text loading...

References

  1. Fan, C., Kan, A.T., Zhang, P., et al.
    [2012] Scale prediction and inhibition for oil and gas production at high temperature/high pressure. SPE J., 17(2), 379–392. doi: 10.2118/130690‑PA.
    https://doi.org/10.2118/130690-PA. [Google Scholar]
  2. Haghtalab, A., Kamali, M.J. and Shahrabadi, A.
    [2014] Prediction mineral scale formation in oil reservoirs during water injection. Fluid Phase Equilib., 373, 43–54. doi: 10.1016/j.fluid.2014.04.001.
    https://doi.org/10.1016/j.fluid.2014.04.001 [Google Scholar]
  3. Kelland, M.A.
    [2011] Effect of various cations on the formation of calcium carbonate and barium sulfate scale with and without scale inhibitors. Ind. Eng. Chem. Res., 50(9), 5852–5861. doi: 10.1021/ie2003494.
    https://doi.org/10.1021/ie2003494 [Google Scholar]
  4. Khormali, A., Petrakov, D.G. and Afshari Moein, M.J.
    [2016] Experimental analysis of calcium carbonate scale formation and inhibition in waterflooding of carbonate reservoirs. J. Pet. Sci. Eng., 147, 843–850. doi: 10.1016/j.petrol.2016.09.048.
    https://doi.org/10.1016/j.petrol.2016.09.048. [Google Scholar]
  5. Khormali, A., Petrakov, D.G. and Nazari Moghaddam, R.
    [2017] Study of adsorption/desorption properties of a new scale inhibitor package to prevent calcium carbonate formation during water injection in oil reservoirs. J. Pet. Sci. Eng., 153, 257–267. doi: 10.1016/j.petrol.2017.04.008.
    https://doi.org/10.1016/j.petrol.2017.04.008. [Google Scholar]
  6. Mackay, E.J., Jordan, M.M., Feasey, N.D., et al.
    [2005] Integrated risk analysis for scale management in deepwater developments. SPE Prod. Facil., 20(2), 138–154. doi: 10.2118/87459‑PA.
    https://doi.org/10.2118/87459-PA [Google Scholar]
  7. Shaw, S.S. and Sorbie, K.S.
    [2015] Synergistic properties of phosphonate and polymeric scale inhibitor blends for barium sulfate scale inhibition. SPE Prod. Oper., 30(1), 16–25. doi: 10.2118/169752‑PA.
    https://doi.org/10.2118/169752-PA. [Google Scholar]
  8. Tantayakom, V., Fogler, H.S., Charoensirithavorn, P. and Chavadej, S.
    [2005] Kinetic study of scale inhibitor precipitation in squeeze treatment. Cryst. Growth Des., 5(1), 329–335. doi: 10.1021/cg049874d.
    https://doi.org/10.1021/cg049874d. [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201800117
Loading
/content/papers/10.3997/2214-4609.201800117
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error