Experience in using self-healing cement to prevent the occurrence of intercasing pressure, as well as generally improve the quality of cementing

Background. In 2023-2024, in order to prevent intercasing pressure, a decision was made to conduct pilot work, which consisted of using self-healing cement when cementing production columns Ø178 mm and combined Ø140x178 mm without using a casing packer. It is worth noting that the use of cement designs with design parameters corresponding to the technical specifications and the use of a casing packer does not always ensure reliable formation waterproofing and the absence of inter-column space leaks (ICL) and intercasing pressure.
Aim. The purpose of this article is to highlight the practical experience of using self-healing cement to prevent the occurrence of intercasing pressure and behind the casing flow.
Materials and methods. Testing of self-healing cement mortar stone was carried out on certified equipment in accordance with the requirements of API 10B-2, API 10B-5 standards, tests of elastic strength properties were carried out in accordance with GOST 21153.8-88 “Rocks. Method for Determining the Ultimate Strength under Volume Compression”, studies of the filtration and capacity properties of cement stone were carried out in accordance with the recommendations of GOST 26450.2-85 Rocks. Method for Determining the Absolute Gas Permeability Coefficient during Stationary and Non-stationary Filtration.
Results. Based on the results of the pilot project without using a casing packer at the current field, the efficiency of using self-healing cements was proven. The increase in the continuous contact interval for 178 mm production columns was 20%. Intercasing pressure was recorded in 3 wells out of 5 after putting into production and performing well servicing operations, however, when releasing pressure from the annular space, the annular pressure decreases to 0 atm, which confirms the ability of cement stone to self-heal.
Conclusions. Self-healing cement technology has proven its effectiveness in real-world conditions, improving the overall quality of cementing and reducing the intensity of intercasing pressure due to its self-healing properties when in contact with hydrocarbons.

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