Gravitational segregation

The application of a pillow (cap) gas containing air and oxygen, aimed at improving the gravitational segregation in offshore production technology, may offer an appropriate alternative to increase the recovery factor in heavy oil-bearing reservoirs [1052]. 

Figure 3.12 Generic illustration of incorrect valve designs for the case of horizontal flow. In these examples only part of the cross section of the stream is sampled all of the time intermittent sampling/signal acquisition is in no way better, see Figure 3.11. The sampling valves shown there offer no counteraction for gravitational segregation and/or flow differentiation effects. All solutions shown are structurally incorrect. A specific valve opening design alone does not eliminate IDE.

In all the above it is assumed that there is no gravitational segregation by drop size, i.e., the drop size distribution does not vary with height. 

Segregation in the potential field of the adsorbent is, to some extent, similar to segregation in the gravitational field. Extensive calculations of gravitational segregation of hydrocarbon mixtures accounting for phase transitions were performed in connection with the problem of hydrocarbon distribution in petroleum reservoirs [105,106]. Two different approaches to such calculations can be identified. According to one approach, system (57) is differentiated with respect to x and transformed to a system of differential equations, which are solved by... 

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