METHOD FOR PIPE STRING CEMENTING Russian patent published in 2015 - IPC C09K8/467 E21B33/138 

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to cementing in subsurface that includes availability of composite capable of setting with increased time for pumping ability maintenance, which contains water cement, cement kiln dust, water and cement setting retarder, at that the composite capable of setting with increased time for pumping ability maintenance may preserve fluid state convenient for pumping within at least one day; addition of cement setting accelerator to the composite capable of setting with increased time for pumping ability maintenance in quantity of 0.1-4 wt %, at that the accelerator comprises at least two additives from the following group: calcium chloride, zinc formiate, calcium acetate; introduction of the composite capable of setting with increased time for pumping ability maintenance into the borehole; withholding the process for setting of the composite capable of setting with increased time for pumping ability maintenance. Invention is developed in dependent claims.

EFFECT: improvement of the method efficiency.

11 cl, 27 ex, 27 tbl