New technologies to isolate lost circulation zones during well intervention
Authors: R.R. Kadyrov, A.S. Zhireev, A.K. Sakhapova, D.K. Khasanova (TatNIPIneft), R.V. Kryuchkov (NIIneftepromkhim JSC)
Lost circulation control is the most expensive type of well work. A suitable cement slurry formulation ensures optimum isolation of lost-circulation zones. Thus clay-silicate slurry is used for squeeze jobs to restore production casing integrity and isolate formations with specific injectivity of 3 m3/(h.MPa), while gypsum silicate slurry is best suited for squeeze jobs during well re-completion operations and repair of damaged casing due to catastrophic mud losses.
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