Domestic elastic self-healing cement system as a method of preventing and elimination of sustained casing pressure and productive layers overflows

Background. During the construction of the well, the casing strings are cemented. In turn, the quality of cementing is influenced by many factors, such as the flow rate, the casing standoff, the parameters of drilling mud and cement slurry, etc. In the case of poor-quality cementing, or the impact of cyclic loads, a violation of the integrity of the cement stone may occur, which in turn can lead to leaks in cement stone and the occurrence of sustained casing pressure (SCP). Prevention and elimination of SCP is a non-trivial task.

The aim of this article is to describe the factors affecting the quality of cementation, as well as the results of laboratory tests of an elastic self-healing cement system (SHC), which helps to prevent and eliminate SCP.

Materials and methods. Industry-specific methods of testing cement slurry and cement stone were used. Unique laboratory equipment was used to test the ability of cement stone to self-heal in contact with hydrocarbons.

Results. Self-healing of the cement matrix upon contact with hydrocarbons (oil, gas condensate) has been confirmed. The potential of using the SHC to prevent and eliminate intercolonial flows in case of violation of the cement matrix during the operation of the well is estimated.

Conclusions. The article describes the results of the actual laboratory testing of the SHC, as well as the potential of its application.

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