In this case, the effect of crude oil ☊PI on the total pump power requirement for three different line average temperatures was studied. Reynolds number is the ratio of inertia force to viscous force) therefore, the friction factor decreases (refer to the Moody friction factor diagram in the March 2009 TOTM).Ĭase Study 2: Effect of Variation of Crude Oil API Lower viscosity results in higher Reynolds (i.e. This can be explained by referring to Figure 2 in which the oil viscosity decreases as the temperature increases. Note as the line average temperature increases, the power requirement decreases. There is about 5% change in the pumping power requirement for the temperature range considered. Figure 1 presents the percent change in power requirement as a function of line average temperature. For each case, the required pumping power was compared with an arbitrary base case (85 ☏ or 29.4 ☌) and the percentage change in the pumping power requirement was calculated, accordingly. For a 35 ☊PI crude oil in the pipeline described in the preceding section, the required pumping power was calculated for the line average temperature ranging from 21.1 to 37.8 ☌ (70 to 100 ☏). To study the effect of the line average temperature on the pumping power requirement, an in house computer program called OP&P (Oil Production and Processing) was used to perform the calculations as outlined in the March 2009 TOTM. The change in pumping power requirements due to changes in crude oil ☊PI and line average temperature for this case study will be demonstrated.Ĭase Study 1: Effect of Line Average Temperature (Seasonal Variation) Since the objective was to study the effect ☊PI and the line average temperature have on the pumping power requirement, we will ignore elevation change. Then assuming 75 % pumping efficiency, the required pumping power was calculated. The procedures outlined in the March 2009 TOTM were used to calculate the line pressure drop due to friction. The wall roughness is 51 microns (0.002 in) or a relative roughness (e/D) of 0.00013. The wall thickness was estimated to be 6.12 mm (0.24 in). The pipeline design pressure is 8.963 MPa (1300 psia) with a maximum operating pressure of 8.067 MPa (1170 psia). For a case study, we will consider a 160.9 km (100 miles) pipeline with an outside diameter of 406.4 mm (16 in) carrying crude oil with a flow rate of 0.313 m 3/s (170,000 bbl/day). In this TOTM, we will study crude oil ☊PI and the pipeline average temperature and how they effect the pumping requirement.
The sensitivity of friction pressure drop with the wall roughness factor was also demonstrated. In the March 2009 tip of the month (TOTM), procedures for calculation of friction losses in oil and gas pipelines were presented. As it is shown in the proceeding sections, viscosity of crude oil is a strong function of API gravity and temperature. Due to seasonal variation, the average line temperature may also change. In addition the properties of crude oil change during production. Production rates during the life of wells vary, too. New wells may be added or some wells may go out of production for maintenance and repair.
PIPESIM 2017 Free Download For Windows is Placed on Our High speed dedicated server with the High-speed download of Download Schlumberger PIPESIM 2017 if you are willing to check the previous version of this app Schlumberger PIPESIM 2015.2 Free Download.During the life cycle of a crude oil pipeline the properties of transported oil change, because in gathering systems the produced oils come from different wells.
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