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Abstract Platforms with limited crane capacities and restricted space in which to set up the necessary well intervention equipment are challenges that the industry is facing increasingly in offshore environments. Operators are having to either compromise on operational efficiency and certainty through the use of memory based slickline conveyance applications (e.g. slickline perforating without real time correlation) or are having to rely on more costly solutions utilizing a multitude of equipment and leveraging workover rigs in order to accomplish their intervention campaigns. Real time slickline’s light, minimal foot print and modular make up coupled with its digital telemetry enablement allows operators to access wells and perform conventional slickline operations, plus perforating, plug setting and production logging, all with downhole in-situ information available on surface in real time, bringing huge operational efficiencies as well as reducing considerably the risks and uncertainties of the intervention programs being undertaken. Interventions executed using real time slickline have proven to be a safer, more efficient and more cost effective way to conduct operations by having full realtime control of its downhole tools and periphery sensors. It reduces the associated risks of having to mobilize and switch between electric line and slickline units, equipment and personnel in the cases where the scope of the intervention programs can be fully covered by real time slickline’s capabilities. Furthermore, its minimal weight and footprint enables intervention operations where space and crane capacities make slickline the only choice of conveyance.
Abstract The scope of the paper is to introduce the application of a new wireless downhole real time telemetry tool and its applications in three different deepwater completions operations. The main method to explain the technology application is through three case histories. In two of these case histories, the availability of downhole real time data led to actions on the surface that ensure the positive outcome of the operation. In the third one, the continuous monitoring of well conditions increase the safety and efficiency aspect of the operation. Another approach used in the paper to validate the technology is the comparison of the field real time data with the expected behavior predicted by the modeling done before the operation. In the fracpack case, pipe contraction due to cooling led to the application of unexpected additional weight on surface. The quantification of different contraction ratios versus temperature drop can help understand the relative movement during operations of downhole tools. In the second case, in the multi-zone single trip system (MZST), the downhole weight transmission monitoring was able to quantify weight transmission at different times of the operation, as expected when the inner string of the tool was inside the outer and permanent string of the system, according to the tubing movement analysis buckling was minimum. In the fluid loss control case, fluid level drop in real time, allowed the determination of fluid loss rate in-situ and secure the well control aspect of the operation immediately after perforating gun (TCP) firing and after an acid frac job. The control of the losses by an optimum overbalance, minimize fluid control losses and reservoir damage. The case histories will show the direct benefits of the technology in well control and productivity, in the completions operations like TCP, fracpack and MZST.