Video: Umbilical Cost Reduction and System Availability Improvement with Use of Chemical Injection Valves
- Murilo Campos (Oceaneering International, Inc.) | Simao Silva (Oceaneering International, Inc.) | Matthew Smith (Oceaneering International, Inc.)
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- Offshore Technology Conference
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- 2018. Copyright is retained by the author. This presentation is distributed by SPE with the permission of the author. Contact the author for permission to use material from this video.
- 4.1.2 Separation and Treating, 4.2.3 Materials and Corrosion, 4.1 Processing Systems and Design, 4.3.3 Aspaltenes, 4 Facilities Design, Construction and Operation, 4.3.4 Scale, 4.5.7 Controls and Umbilicals, 4.5 Offshore Facilities and Subsea Systems, 4.5.10 Remotely Operated Vehicles, 2.1.3 Completion Equipment, 6.3.6 Chemical Storage and Use, 4.2 Pipelines, Flowlines and Risers, 4.2 Pipelines, Flowlines and Risers, 4.3 Flow Assurance
- Chemical Injection Metering Valve (CIMV), Optimication, Chemical Throttling Valve (CTV), Chemical Injection, Umbilicals
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Including chemical injection valves (CIVs), also known as chemical-injection throttle valves (CTVs), in subsea architectures can provide significant cost savings during the field development phase, while improving overall system availability over the design life.
CTVs can create economic and operational benefits for multi-well developments by reducing the number of chemical injection tubes required in the umbilical. Subsea wells often require chemical injection into the production fluid to inhibit scale, corrosion, asphaltene, or hydrate formation that can compromise the flowline integrity and impact or impede production. Chemicals are conveyed from the host facility through small-diameter stainless steel tubes that are bundled in the umbilical, which can also include hydraulic, electric power, and communication lines. Traditional oil and gas fielddesigns call for a dedicated tube for each treatment injection point, which typically ranges from two to four per subsea tree, depending on the flow assurance requirements. CTVs precisely control chemical flow rate at the point of injection, thereby allowing a single chemical tube to serve multiple injection points. This reduces capital expense and enables longer tiebacks.
The tubes in an umbilical make up to 80% of the cost of that unit. The reduction in the quantity of chemical injection tubes can allow the operator to adopt a more robust spares philosophy for the remaining tubes, and, since CTVs can be easily replaced by the use of a remotely operated vehicle (ROV)support vessel, the resulting system can have significantly greater overall availability over the service life.
CTVs can also be applied in brownfield applications to restore chemical injection to the wells after tube blockage and enable field expansion without installing new umbilicals.