| dc.description.abstract | The E&P business is constantly driving improvements to ensure safe and efficient operations and optimize production. Well Interventions are used to increase the production and extend the well lifetime which results in an increased recovery rate from the producing field. Well interventions are frequently used and both operators and service companies are continuously seeking to find the most cost-efficient technological solutions. One of the latest light well interventions (LWI) technology developments is CoilHose. This is an LWI operation utilizing technology and experience from both of the two most common methods, wireline, and CT. CoilHose has been developed in Norway by Quality Intervention, a company that was acquired by Expro in 2019.
CoilHose consists of two different commercial models named Mk.4 and Mk.6. Mk.4 is around ¾”, while Mk.6 is nearly 1” in outer diameter. The footprint is comparable to wireline. In contradiction to wireline, CoilHose enables volume flow. It consists of polymers and steel and is characterized by being light and flexible compared to CT. The recently developed Mk.6 has integrated a fiber layer into the hose to reduce the elasticity in the longitudinal direction. Less stretch makes it easier to maintain inner and outer dimensions, but also extends the reach and predictability. The new properties improve the CoilHose potential and area of use. Calculations demonstrate a higher volume flow and fewer limitations to higher well pressures.
The two thorough case studies performed in this thesis gave a good insight into the practical use of CoilHose. The thesis applies simulations and calculations of well interventions from real case studies, which gave valuable insight into the practical application of CoilHose on Ivar Aasen and Brage. The case studies proved the high potential for CoilHose, as long as well pressures and flow rates are at lower levels. By simulations in Cerberus of our particular case study at Ivar Aasen, CoilHose proved itself incapable of delivering the required volumes of N_2 for gas-lift. Recreating the simulations from calculations confirmed the results. The other case study at Brage demonstrated the efficiency and potential of CoilHose. Scale removal was simplified significantly by using CoilHose instead of hand jarring.
These two case studies resulted in one success (scale removal on Brage) and one challenging case (N2 for gas-lift on Ivar Aasen). This strengthens the position of CoilHose as an alternative to CT and wireline and not a complete substitute. | |