Saudi Aramco has used gravity water injectors extensively as a reservoir pressure maintenance means to support oil production from a mature field. Gravity water injectors in Field-A are perforated in a highly productive and shallow water producing aquifer. The aquifer pressure and hydrostatic column, between producing and injecting formations, complement each other to achieve gravity injection into a deeper formation. The particular completion of gravity water injectors in Field-A calls for novel approaches to reservoir surveillance as well as well integrity monitoring.

Many unconventional petroleum engineering practices were conceived and applied to responsibly handle gravity water injectors in Field-A. The implemented practices are best in class to monitor gravity water injector injection performance and safeguard the downhole integrity of the injectors. Frequently deployed flowmeter logs were utilized as the main survey source of Field-A's gravity water injectors. Performance indicators and downhole well integrity issues obtained from flowmeter logs are presented throughout this paper.

This paper will also discuss items of interest related to special rigless well intervention practices associated with the nature of gravity water injector completions. The rigless procedures are meant for achieving objectives such as injectivity enhancement, well revival, and wellbore mothballing designed for this type of water injectors. Additionally, a means of regulating injection rates through the installation of down-hole choke valves is going to be described as a case study in this literature.

Finally, various noteworthy aspects of gravity water injector workover operations will be outlined. The aspects associated with gravity water injector workovers include recompilation (conversion) into regular power water injectors as well as regular maintenance workovers.

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