Content Tagged: "hydrate"

Operators describe how their best practice hydrate management strategies have evolved.

Natural gas hydrate deposits are found on all active and passive continental margins as well as in permafrost regions and deep lakes.

Climate change is known to be dominantly caused by the increased concentration of greenhouse gases in the atmosphere, particularly carbon dioxide (CO2).

Gas hydrate formation in oil and gas pipelines may cause flow assurance problems, especially in deep water subsea tiebacks. Agglomeration and bedding of hydrates particles and its deposition on pipe walls may form blockages that stop production. This presentation will cover the systems approach that we, at the Center for Hydrate Research of the Colorado School of Mines, have followed to design our mathematical models to predict gas hydrate formation in multiphase flow pipelines.

The aim of this presentation would be to explain/detail how techniques/devices can work together into an integrated intelligent hydrate management (IHM) system.

Traditionally gas hydrates avoidance has been pre-requisite in the design and operation of offshore gas production systems. Transformation towards a risk management paradigm requires collaboration between industry, government and academic research.

For 29 years, our team of specialists have designed and installed real-time online systems that are designed to monitor production, gathering, export and transportation systems. These systems currently support the operations of 30% of the world’s LNG production, and about 10% of the global natural gas pipeline networks and various important oil developments. This talk will discuss what are the key requirements and lessons learned to provide accurate 24/7 monitoring and surveillance of these vital operations, particularly those when there is only limited access to the server machines on these assets.

This webinar will provide an overview and benefits of key building blocks available to unlock stranded reserves by using long distance subsea tiebacks.

The aim of this presentation would be to explain/detail how techniques/devices can work together into an integrated intelligent hydrate management (IHM) system.

Assumptions have been made about the hydrate inhibition characteristics of hydraulic / storage fluids in umbilicals due to the inclusion of MEG, but AFS has tested a dozen fluids to better assess their hydrate inhibition characteristics and develop the curves. The curves will be provided within this presentation and shared with the community. In addition, a short discussion on the displacement of umbilical fluids with production chemicals and the laboratory testing performed versus the calculated results utilizing laminar flow.

This webinar brings together specialists from operating and engineering companies, as well as equipment suppliers, to talk about their experiences in managing a diverse range of Flow Assurance problems in different parts of the world.

In the present time, it is even more pressing that we develop and implement more efficient and smarter approaches for hydrate management, requiring a much deeper and broader understanding on hydrate thermodynamics and hydrate transportability in multiphase systems. In this webinar, the presenter highlights some areas where key advances in the lab have enabled consequential impact into hydrate management in the field. While gaps remain, efforts in bridging the basic research to the engineering solutions exemplify a diverse and innovative approach to translational research.

​The discussion will be a case study of design simplifications for a subsea tie-back (including flow assurance FEED) to enable investment decision in 3 months. Simplifications included design to mitigate asphaltene and hydrate challenges along with a long tie-back in deepwater GoM. An integrated team including subsurface, facilities and flow assurance enabled the decision with partner approval for a brownfield tie-back.​

This webinar will describe the wax deposition and hydrate transport models chosen and the importance of its integration into a generic, but well proven multiphase transient simulator framework. The use and importance of these integrated flow assurance models will be briefly demonstrated through a field conceptual design application with results.

Hydrate plugged a pipeline with gas flowing through water at elevated pressure, low ambient temperature, treated with a hydrate promoter and spiked with propane. Predictive methods accurately showed where the dominant blockage formed. During blowdown from 660 to 12 psia, hydrate redeposited in vent orifice. Field measured flow velocity reached 74 ft/s, wall shear at hydrate deposition reached 78 Pa. Hydrate deposited at that shear reduced the orifice area approximately by half, which extended the time to depressurize, affecting process safety. Blowdown time formula matched state-of-the-art multiphase transient simulation. Shear stress should be a common parameter reported by researchers in flow assurance.