Long-term distributed fiber optic monitoring of temperature (DTS) and acoustic (DAS) parameters in horizontal wells has been used for some time in the industry. However, wells for permanent fiber optic monitoring were previously either naturally flowing oil and gas wells, or injection wells. It is obvious that distributed monitoring technology is of the greatest interest for wells with the electrical submersible pumps (ESP), but there have always been issues with the RIH operation of fiber-optic cable sensors to the toe of the horizontal well beyond the ESP. Having passed the path from the pilot jobs to a couple of dozens of DTS installations in horizontal wells in recent years, Gazprom Neft have mastered this innovative technology for the first time in Russia, in modifications with both DTS and DAS. Distributed fiber optic based permanent monitoring of multi-stage hydraulically fractured horizontal wells with the ESP has now been successfully implemented at the Yuzhno-Priobskoye oil field. In 2022 and 2023, the Company equipped two operational pumping wells with a fiber-optic monitoring system, and the duration of monitoring for one of them exceeded one year. Also, engineers radically improved the technology of interpretation and analysis of the received data, which made it possible to abandon the services of a third-party service and significantly reduce the cost of technological processes. Currently, the DTS of long-term permanent monitoring is prepared for a massive implementation at other Gazprom Neft business units, and the obtained information is recognized as in demand for optimizing the development system of low-permeable reservoirs. Below, the authors present some results illustrating the uniqueness and at the same time the universality of the information support of DTS monitoring in order to substantiate workovers on the production wells with multistage horizontal completion.
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