NODAL ANALYSIS GRAPHICS – APPLICATION IN PETROLEUM INDUSTRY

Analysis Nodal is one of the most important topic you must really know in order to understand how well’s behaviour and the appropriate way to select mechanism of production so that we will produce well with an optimized flow rate.

LOCATION OF VARIOUS NODES

Reservoir pressure and separator pressure must be considered as constant. Besides, Separator pressure is approximately 100 psig because it would be easier to computize. Therefore, Trial and error solution must either start in Node 1 (Psep) or Node 8 ( Pres) in order to calculate any node which is among them such as Node 3, 4 so on.

To select node depends on which component, may be isolated to be evaluated. All components in the well, beginning from static pressure to separator pressure, have to be considered, this include flow rate through porous media, perforatings, and completion.

In order to computize flow rate, there are two ways which must be known. All system is divided into two components, the reservoir (IPR curve) and total system of drillstrings (which consists of separator, flowline and tubings as well as being assumed that there is no restriction. In addition, It has only considered pressure losses in the flowline and tubings.

PART A:

The inflow component is IPR ( Inflow Performance Rate) and the outflow component consists of Separator, flowline, and tubing. As I said before, Separator pressure is usually regulated as a constant value; however, some separator pressures change with flow rate and must suitably be determined.

Horizontal Flowing Pressure Gradients must really be based on Flowline size, production rate, gas specific gravity, average flowing, temperature, oil API gravity, water swpecific gravity.

HORIZONTAL FLOWING PRESSURE GRADIENT

PART B:

All system is divided into two components in order to calculate flow rate. A component is the Separator Tank and Flowline. And the other component is the reservoir and tubing string. The outflow component begins with separator pressure with the purpose of obtaining the Well head pressure.

Vertical Flowing Pressure Gradients must be focused on water specific gravity, Oil API gravity, tubing size, production rate, gas specific gravity,  average flowing temperature.

VERTICAL FLOWING PRESSURE GRADIENT

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