Modeling Formation Damage and Completion Geometry in the Gyda Reservoir

This study concerns the mature Gyda reservoir, where some recent production wells have underperformed relative to equivalent initial wells. In particular, a sidetrack to an early successful well had very poor performance on initial startup. Subsequently, the geometry of both the original well and the sidetrack was simulated. In the original well, an attempted hydraulic fracture was assumed to have failed. This assumption was challenged in the model. The model has enabled evaluation of old wells and, more importantly, design of new wells in this mature-reservoir development.
Introduction
Gyda is a mature oil development in the Norwegian sector of the North Sea. The first production wells were drilled more than 20 years ago. Some recently drilled Gyda wells have not fulfilled production objectives. A numerical 3D model was proposed in order to investigate and understand the flow dynamics and the production potential from the Gyda A19 and A19A wells. This modeling process includes a detailed numerical 3D fluid-flow simulator based on computational fluid dynamics (CFD), which captures the reservoir, well, and completion geometry complexity.
The CFD simulations are used to determine potential explanations for the wells’ performance and lead to stimulation options and development of optimum drilling and completion for future wells. Because Well A-19 is very similar to Well A19A, some conclusions may be derived from the present study that could support the understanding of the productivity behavior of Well A19A.
To achieve the objective, one CFD model of both wells was constructed. Different completion options were provided, including the case of the hydraulically fractured well. Several sensitivity analyses were carried out in order to depict the well potential.
If you would like to continue reading,
please Sign In, JOIN SPE or Subscribe to JPT
Modeling Formation Damage and Completion Geometry in the Gyda Reservoir
01 February 2015
Flow-Simulation Model Improves Analysis of Perforated-Rock Cleanup and Productivity
Because of inherent complexities, understanding the characteristics of perforations in downhole environments is a significant challenge. Perforation-flow laboratories have been used to provide insight into cleanup and productivity mechanisms around perforation tunnels.
Formation Damage
Formation damage: Do we always need to have a high focus on its prevention, or do occasions exist when it really does not matter?
Study of Carbonate Reservoirs Examines Fines Migration in CO2-Saturated-Brine Flow
A high-carbon-dioxide (CO2) carbonate gas field offshore Sarawak, Malaysia, is scheduled for development. Reservoirs in this region have an average clay content of 8%; more than 50% of this clay content is migratory illite, and 15% is migratory kaolinite.
No editorial available
ADVERTISEMENT
STAY CONNECTED
Don't miss out on the latest technology delivered to your email weekly. Sign up for the JPT newsletter. If you are not logged in, you will receive a confirmation email that you will need to click on to confirm you want to receive the newsletter.
ADVERTISEMENT
No editorial available
ADVERTISEMENT
ADVERTISEMENT