Рreservation of reservoir properties during well completion under abnormally low reservoir pressure

The paper examines specific aspects of the completion stage during well construction under abnormally low reservoir pressure (ALRP). To establish hydrodynamic communication with the productive formation and ensure the integrity of the well, the quality of well completions is particularly important during the construction. Well reliability and quality are interrelated and overlap according to certain evaluation criteria, making it difficult to clearly distinguish between these two indicators. Possible ways to prevent these issues through the use of foam-forming blocking compounds with filler (FBCF). Key aspects that ensure the ability of the well to perform its intended purpose are identified and grouped. Reliability and quality indicators in hydrocarbon well construction under ALRP conditions are summarized. Key indicators for assessing well completion quality under ALRP conditions are defined to prevent a decrease in the filtration and capacity properties of the reservoir (PRP). FBCF compositions have been developed and components selected, taking into account their interaction within the fluid to achieve maximum performance under reservoir conditions. It is demonstrated that the use of fillers in PBSN allows for the creation of a low-permeability filter cake in the near-wellbore zone (BWZ), preventing the absorption of biomass by the productive formation during various completion operations during well construction under abnormal pressure conditions. The effectiveness of forming a blocking screen in the BWZ and its dependence on the correct filler size selection for sealing all fractured pores at the BWZ entrance are presented and demonstrated. A technology and compositions for preliminary blocking of the BWZ during the completion stage of well construction using PBSN are proposed.

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