Simulation of a well with ESP on tubing and natural flow on annulus for energy saving of well alike

A subject oil well is produced artificially using an Electric Submersible Pump (ESP); the well is also flown naturally from the annulus, which is not initially designed for the well. The well produces with high Gas-Liquid Ratio (GLR), high API Gravity oil, and high Water Cut. Well fluid data and also its production have to be verified its acceptability. The production data, and the Pump Intake Pressure (PIP) data has to be taken at the same time frame. The first step is to evaluate the ESP production from the tubing. The evaluation indicated that the installed ESP has excellent volumetric efficiency of 96%. The second step is to evaluate the flow in the annulus. The ESP is equipped with a downhole gas separator; thus, the gas flows to the annulus. Since the annulus has very high GLR, fluid flows naturally in the annulus. The simulation of two-phase flow in the annuli employed various correlations. However, the best correlation is TUFFP with a hold-up factor of 0.292. The flow simulation of ESP in the tubing and natural flow in the annulus should lead to production optimization, from ESP energy saving. It is recommended to have much better production data.