Prediction of Formation Water Properties Using a Novel Predictive Tool Approach and Vandermonde Matrix

Abstract

Proizvodnja mokre sirove nafte je zbog podizanja kontakta nafta-voda na mnogim naftnim poljima sve veći problem i zbog toga proizvodnja slane mokre nafte utiče na kvalitetu sirove nafte. U ovom radu je predstavljena jednostavna metoda za procjenu svojstava slojne vode korištenjem Arrhenius-ove funkcije i Vandermondove matrice za temperature iznad 30 °C i sadržaja soli između 5 i 25% masenog postotka. Ustanovljeno je da se procjene odlično poklapaju s vjerodostojnim podacima iz literature sa srednjim apsolutnim odstupanjem koje varira između 0,08 do 2,7%. Metoda koja je razvijena u ovoj studiji je od velike važnosti za naftne inženjere i inženjere u praksi jer im omogućava brzu provjeru svojstava slojne vode kod različitih uvjeta bez potrebe izbora bilo koje eksperimentalne metode. Kemijski i naftni inženjeri će ustanoviti da je predloženi pristup prilagođen korisniku s transparentnim izračunima koji ne uključuju složene izraze.Production of wet crude due to the raise in oil-water contact in many oil fields has been a growing field problem and consequently production of salty wet crude affects the quality of crudes. In this work a simple method using Arrhenius-type function and Vandermonde matrix is presented for estimation of formation water properties for temperatures above 30 °C and salt contents between 5 and 25% by mass. Estimations are found to be in excellent agreement with the reliable data in the literature with average absolute deviation varying between 0.08 to 2.7%. The method developed in this study is of immense practical value for petroleum engineers and practice engineers for a quick check on the formation water properties at various conditions without opting for any experimental measurements. In particular chemical and petroleum engineers would find the proposed approach to be user-friendly with transparent calculations involving no complex expressions