Oil production nowadays become more challenging worldwide from high depletion and water production. New devices for water control are available in the market, but an integration with borehole data is critical for optimizing the ratio between oil recovery and water constraint. In this case study, the production forecast for the well was of 600 bd with no water, however the initial well test gave a production of 50 bd with 95% water cut. The main reason behind this contrasting result was unexpected structural features connected with lower aquifers.
A lower completion design with water control devices was put in place based on open hole data. To reduce the uncertainty and optimize the design, a logging acquisition of resistivity and caliper was suggested to evaluate the remaining fluids of the reservoir and how much of the water was related to reservoir depletion. Due to a rig restriction (a hoist unit) a pipe convey method to acquire data through logging was not possible. Instead logging while tripping was utilized, and we could successfully acquire a reliable caliper, resistivity, and density neutron readings. These results helped us refining the design, optimizing the amount of control devices, and securing the packer placement in the best zones for proper swelling.
After the flow to clean process, the well tested 250 barrels of oil with 20% water cut which is aligned with the prediction during the design and planning stage.