Water cross flows between beds and inter-formational water cross flows behind the casing string are fairly common problem in Western Siberia fields. Self-healing cement compositions are designed to provide durable annulus sealing at wells operation without a repair and insulation work. Self-healing cement stone is generally prepared by the introduction of components, increasing in size under certain conditions, to its composition. The most promising method of self-healing cracks in the cement stone during its contact with water is the introduction of the capillary-active additives of penetrating action to the cement matrix. Self-healing cement compositions, with use of which more than 100 casing strings of wells are cemented, are developed. Field research data have shown that water cross flows are observed in four experimental wells (4% of total number of wells versus 45% at the underlying technology application), and water cross flows between beds are not detected in any of the experimental wells.
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