Study on the Separation Technology of HGS and Its Effect
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larger the opening was, the larger the inlet velocity was. Therefore, after entering the
separator, the centrifugal force on HGS will gradually increase with the opening degree
becoming lager, so as to promote the separation efficiency of HGS.
Critical diameter range
Uptrend
Downtrend
Fig. 11. Frequency of the pump is 25 Hz
Critical diameter range
Uptrend
Downtrend
Fig. 12. Frequency of the pump is 30 Hz
Critical diameter range
Uptrend
Downtrend
Fig. 13. Frequency of the pump is 35 Hz
Critical diameter range
Uptrend
Downtrend
Fig. 14. Frequency of the pump is 40 Hz
3 Mathematical Model
3.1 Model Assumption
(1) The HGS is evenly mixed with the drilling fluid and the time from separation to
entry into the annulus is negligible.
(2) Not taking into account the heat generated by the collision between the HGS.
(3) The diameter of HGS is so small, so it’s easy to aggregate under the influence of
the viscosity of drilling fluid. Under this condition, the flow state is similar to that
of oil, so it is treated as liquid phase.
(4) The radial variation of wellbore temperature is not considered.