Pre-salt Seafloor Construction/Remote Operations Challenges Part 2
According to Petrobras production engineers, secondary recovery is increasingly being implemented to improve oil recovery in the pre-salt carbonates, where reservoir rocks are usually oil wet, and this characteristic affects the performance of water injection. Another problem concerning water injection is related to rock-fluid interaction, which is more important and complex in carbonates. In order to assess the risks involved, as well as to define mitigation actions, rock-fluid interaction tests are being carried out in the reservoir rock and the salt cap rock. Alternative recovery methods are being implemented in the pre-salt reservoirs.
Hydroid´s Remus 6000
The Remus 6000 AUV was designed and developed by a partnership between the Naval Oceanographic Office, the Office of Naval Research and the Woods Hole Oceanographic Institute (WHOI). The Hydroid Inc, is young company, which was founded in 2001 by the inventors of REMUS to commercialize their product and to allow this ultra-deepwater AUV technology to reach a wider market and to guarantee funding for continuous product development. The REMUS AUV is the product of over 15 years of leading edge research and development. The REMUS 6000 is the deepwater version of the acclaimed Remus 100, lightweight, shallow water AUV and the Remus 600 deep water AUV.
Improving Production Using Subsea Separation Boosting
Subsea gas-liquid separation coupled with liquid boosting can be an effective means of oil reservoir exploitation. Despite advances, multiphase pumping technology remains limited in its capabilities. Dynamic (centrifugal and helico-axial) pumps function with reasonable efficiency for single-phase, low-viscosity liquids. However, they become very inefficient when a high-viscosity liquid is combined with high percentages of free gas. While use of multiphase pumps is in many instances an effective solution, special consideration must be taken when challenging conditions exist such as are found in deeper water or with long tieback distances, or when heavy-oil production is involved. More effective oil reservoir exploitation can be achieved using subsea separation coupled with liquid boosting.