Page 47 - Petroleum and Gas Field Processing

available for the determination of pressure drops in vertical,
inclined, and horizontal pipes.
3. Sizing Tubing and Flow Line: Determination of the tubing and
flow line sizes is a complex process involving the determination
and prediction of future well productivity, analysis of multiphase
flow under varying production conditions, and economic
analysis. However, a simplied approach is summarized in the
following steps and illustrated in Figure 18:
(i) Determine (predict) the present and future IPR. Plot the
results as P wf versus q.
(ii) Selecting tubing and flow line diameters and starting with a
specified value for the surface separator pressure, determine
the flowing bottom-hole pressure for a specified production
rate, water cut (W.C.) and gas–oil ratio (GOR), using
available multiphase flow correlations or models.
(iii) Step (ii) is repeated for different values of production rates
(q) with W.C. and GOR being fixed. Thus, a relation
between q and P wf is established and presented on the same
plot of the IPR.
(iv) Steps (ii) and (iii) are repeated for various combinations of
tubing and flow line sizes.

Figure 18 IPR and outflow performance for different tubings.

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