Process Engineering > Case Studies > Caltec, UK

Subsea Multiphase gas-liquid hydrocyclone separators

Caltec UK 1
Caltec UK 2
Caltec UK 2

Overview: Solid particles in oil and gas production systems can lead to problems like wear, which can affect valves, compressors, pumps, piping and hydrocyclones. Solids cause blockages of instrument nozzles and affect separation equipment such as the blocking of hydrocyclones and filling up of separators. The presence of solids can be due to an increase in the gas-oil ratio (e.g. due to gas injection), low-pressure production, increased water production, well clean up or well/sand collapse.

The challenge: The points of interest for the design engineers are multiple, among which: changing the depth of the inlet involute by making this deeper to increase the throughput of fluids through the device whilst maintaining a high ‘g’ force generation, changing the separation chamber and making use of a venture type chamber to help improve the stability of the device, and modifying the vortex finder, both the diameter and depth and look at the effect on the separation efficiency

TransAT Solution: With the advanced turbulence modelling and the IST meshing technique, TransAT proves capable to resolve the flow-field in the separator. Two scenarios where tested: liquid-oil separation through the rotational centrifugal force, where the N-phase phase average model of TransAT was employed, and particle-fluid separation (3rd panel), where use was made of the Lagrangian two-way coupling technique, including particle-wall interaction. Various configurations have been tested, including indeed changing the depth of the inlet involute, and changing the separation chamber.

InfoExpert: Contact our expert

Dr Chidu Narayanan
ASCOMP Switzerland
Tel. + 41-44-445-4071