| Popis: |
The Deep-Water (DW) Gulf of Mexico (GOM) fields have a complex mix of multi-layered reservoirs, with thicknesses and rock properties which can widely differ from layer to layer within the same reservoir. Injection of 25,000 bpd of water from a shallower aquifer B4 sand via a dump flood technique, benefited from a variable and controlled zonal distribution of the injection into two separate layers connected to the producer B6 Sands over life of well. This paper presents the modelling performed to achieve optimal choke selection, specified distributions, job execution and results of utilizing multi-position flow valves as part of the 3 ½" completion with the objective of achieving the optimal injection rates in the upper and lower layers of the BB Sands. Design parameters considered critical by Talos included a controlled and variable distribution of the injection via dump flood of 50%/50% or 25%/75% respectively for the upper and lower layer of the producer B6 Sands, with the option to selective shut-off one of the layers over time, while maintaining the 3 ½" full-bore inner diameter for future interventions. Discussed within this paper : The selection process to meet the required distribution rates with the extensive modelling performed using modeling software for the choke size selection, quantity, and distribution in each of the three open positions of the multi-position flow valve to achieve the total flow area required to distribute the injection at the desired rate in each layer of the producer sand, and CFD (Computational Fluid Dynamics) for the choke design. Field data from the first installment of two multi-position flow valves in a well located in the Tornado project, operational considerations that enabled the manipulation of the flow valves and a summary of the achieved results will be presented and explained. This is the first deployment for the multi-position flow valve with variable chokes in the deep-water Gulf of Mexico well environment. The solution provided controlled injection with variable rates into the two upper and lower producer sands, this technique enables a cost-effective and reliable proven solution which can be applicable to any type of injector well, with the goal to increase the overall NPV of the field, through the increased recoverable using a predictable and safer method of downhole flow control. |
