Manifestation features of characteristic technological properties of various killing fluids

UDK: 622.276.76

DOI: 10.24887/0028-2448-2026-2-63-70

Key words: killing fluid, well killing operation, calcium chloride, sodium chloride, calcium nitrate, potassium formate, corrosion activity, scale deposit

Authors: A.N. Kolevatov (Izhevsk Petroleum Research Center CJSC, RF, Izhevsk); K.S. Fot (Izhevsk Petroleum Research Center CJSC, RF, Izhevsk); S.L. Olesova (Izhevsk Petroleum Research Center CJSC, RF, Izhevsk); S.V. Onikienko (Izhevsk Petroleum Research Center CJSC, RF, Izhevsk); A.E. Folomeev (Izhevsk Petroleum Research Center CJSC, RF, Izhevsk)

The article describes an analysis of various killing fluids for the fields of one of the oil companies in the West Siberian region. The Oil Company's productive formations of fields are deep-seated, have a high temperature factor (93-104°C), significant formation reservoir pressures, and a high content of hydrocarbonate ions in the produced associated water. This causes the problem of incompatibility of these waters with killing fluids of various densities, as well as the severe corrosion activity towards downhole equipment. The interference of reservoir pressure over the area and section of oil fields determines the use of killing fluids of different densities during well killing operations. The article discusses the characteristics of the technological properties of killing fluids of various densities based on the following components: sodium chloride (halite), calcium chloride, a blended saline of halite and calcium nitrate, a blended saline of calcium chloride and calcium nitrate, potassium formate, and two ready-made salt of trademarks. It has been shown that in most cases, corrosion inhibitors and scale inhibitors mutually reduce each other’s effectiveness. This is reflected in an increase in salt deposits and corrosion aggressiveness when mixing killing fluids with produced associated waters.

In addition, the issue of the imperfections of market ready-made mixtures and the need for separate selection and testing of killing fluids for water injection and producing wells is discussed, due to their significant differences in operating conditions.

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