THE EFFECT OF ALKALI TYPE ON IFT VALUE FOR SURFACTANT - ALKALI INJECTION Firmansyah Wahyu Latief, Rini Setiati, Dwi Atty Mardiana, Yani Faozai Alli
Petroleum Engineering Depertment, Universitas Trisakti, Jakarta, Indonesia
Abstract
The purpose of this research is to determine the effect of alkali on surfactants on the value of IFT and determine the temperature difference on the stability of surfactant-alkaline IFT.
There are six alkaline surfactant solutions used. Solution compatibility test in this experiment includes aquos stability, CMC, IFT, phase behavior test by observing the formation of micro emulsion survived 24 hours and thermal stability at reservoir temperature (60o C) for 7 days.
There are two types of surfactant-alkaline solutions that pass the selection stage, OGEP 400 OLEAT concentration of 0.3% salinity 5% and NaOH with a concentration of 0.1% with the surface tension test results of 5.176 × 10-3 dyne / cm, the reading of the phase behavior is in phase 1, unstable thermal stability test with IFT after thermal measurement of 1,385 × 10-2 to 2,416 × 10-2 dyne / cm, filtration ratio of the filtration test of 1.2 ml / second and recovery factor of the imbibition results of 75.5%. As for the Na2CO3 alkali at a concentration of 0.5% with a surface tension test result of 3,379 × 10-3 dyne / cm, the reading of the phase behavior is in phase 1, a relatively stable thermal stability test with an IFT after thermal measurement of 2.42 × 10-2 to 2.871 × 10-2 dyne / cm, the filtration ratio from the filtration test is 1.17 ml / second and the recovery factor from the imbibition results is 57.8%. The addition of alkali was proven to reduce surfactant IFT to touch 10-3 dyne / cm. This can be used as a basis for applying EOR to sandstone formations
