Producing well conditions in the southern region of Mexico present challenges that can benefit from the use of a newly developed intervention technology. This paper describes the development of this real-time fiber-optic (RTFO) integrated system. RTFO is used for depth correlation and real-time pressure and temperature monitoring inside the coiled tubing (CT) and the outer annulus. Additionally, distributed temperature sensing (DTS) survey capabilities can provide instantaneous evaluation of downhole treatments in real-time. The data is transmitted by means of a 4-mm fiber-optic (FO) capillary to surface data acquisition equipment, allowing both monitoring and job execution changes in real-time. This technology allows operators to make immediate treatment decisions to help achieve the best results possible. Additional sensor expansion is possible because of the modular design of the bottomhole assembly (BHA).

This paper discusses the fast-track developmental process of the RTFO system as well as quantitative lab and full-scale yard testing. Case histories from three high-temperature deep candidate wells in the Latin American region are presented. Lessons learned from the initial field trials and the resulting next-generation design enhancements and sensor expansion capability of the tool are also highlighted.

The synergy of the CT RTFO system, cleaning nozzle selection, and a tailored fluid program proved to be a successful combination for effective cleaning of the case history wells discussed.

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