Depleted reservoir and use of managed pressure techniques on the Norwegian continental shelf
Master thesis
Permanent lenke
https://hdl.handle.net/11250/3147202Utgivelsesdato
2024Metadata
Vis full innførselSamlinger
- Studentoppgaver (TN-IEP) [339]
Beskrivelse
Full text not available
Sammendrag
The oil and gas industry faces challenges in drilling, especially in high-pressure, high-temperature, and depleted reservoirs due to overlapping and narrow drilling windows of these reservoirs. Energy demand and the depletion of existing reservoirs push the industry to recover as much as possible oil from existing reservoirs on the Norwegian continental shelf (NCS). Conventional drilling methods struggle with issues such as losses and gains due to overlapping and narrow drilling windows. Industry developed Managed Pressure Techniques (MPT) to solve these issues such as Underbalanced Drilling (UBD), Managed Pressure Drilling (MPD), and Managed Pressure Cementing (MPC). In this thesis, simulation is done on a real well stability diagram from NCS to show how MPD and MPC can assist in drilling this well. It is also discussed that the conventional drilling method will not work for this well with an analytical solution.MPD simulation is run for the 12 1/4” section with a target Equivalent Circulation Density (ECD) of 1.72 sg by using Oil Based Mud (OBM) of 1.50 sg and the 6” section with a target ECD of 1.56 by using OBM of 1.30 sg and the result is impressive without any problem during drilling and connection. MPC simulation is run for the 9 5/8” liner with a target ECD of 1.72 sg. Simulation results show that MPD and MPC can maintain constant ECD during drilling, connection, and cementing operations. On the other hand, conventional drilling methods cannot maintain a constant ECD during connections. MPD and MPC are the best solutions to drill a well with stability issues by using MPD and MPC technology rather than conventional methods on NCS. Its trend is going up on the NCS due to mature and depleted reservoirs, and activity for this technology will increase because MPT gives good results.