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Paper Information

Title: 

LABORATORY INVESTIGATIONS OF IMMISCIBLE SAG DISPLACEMENT: THE EFFECTS OF SAG RATIO

Type: PAPER
Author(s): MOHAMMD SALEHI MEHDI*,TABATABAEI NEJAD SEYYED ALIREZA,SAHRAEI EGHBAL,ZILAEIPOUR OMID
 
 *
 
Name of Seminar: INTERNATIONAL CONFERENCE OIL, GAS, PETROCHEMICAL AND POWER PLANT
Type of Seminar:  CONFERENCE
Sponsor:  SHERKATE TAVONI AMOZESHI PAZHOHESHI VESTA
Date:  2012Volume 1
 
 
Abstract: 

NITROGEN IS ONE OF THE GASES USED IN THE BOTH MISCIBLE AND IMMISCIBLE GAS INJECTION PROCESSES INTO THE RESERVOIRS. THERE ARE SOME PHENOMENA SUCH AS OVERRIDING, FINGERING AND CHANNELING IN HETEROGENEOUS FORMATIONS CAN CAUSE DECREASING OF BREAK THROUGH TIME IN PRODUCTION WELL DURING OIL DISPLACEMENT. SURFACTANT ALTERNATING GAS INJECTION PROCESS IS ONE OF THE METHODS COMMONLY USED TO DECREASE THIS PROBLEM. THE FOAM RESULTING FROM THE CONTACT OF NITROGEN AND SURFACTANT, CAUSES INCREASING OF INJECTION GAS VISCOSITY. CONSEQUENTLY, THE OIL AND GAS CONTACT TIME AND SWEEP EFFICIENCY INCREASES. IN THIS PAPER, AN EXPERIMENTAL STUDY OF THE EFFECT OF SURFACTANT TO GAS RATIO ON OIL RECOVERY IN SECONDARY OIL RECOVERY PROCESS DURING EXECUTION OF IMMISCIBLE SURFACTANT ALTERNATING GAS INJECTION WAS EXAMINED EXPERIMENTALLY. THE EXPERIMENTS WERE PERFORMED WITH SAND PACK UNDER CERTAIN TEMPERATURE AND PRESSURE. HOWEVER, BEFORE THE EXPERIMENTAL, THE CONCENTRATION OF SURFACTANT WAS OPTIMIZED IN ORDER TO MINIMIZATION OF ITS ADSORPTION ON ROCK SURFACE. THEN, THE EXPERIMENTS WERE DONE WITH SURFACTANT TO GAS RATIO OF 1: 1, 1: 2, 1: 3, 2: 1 AND 3: 1. FINALLY, THE EXPERIMENTAL RESULTS SHOW THAT USING THE CONCENTRATION OF 1500 PPM OF SURFACTANT SOLUTION CAN BE USED TO PERFORM THE ECONOMIC TEST. THESE RESULTS ALSO SHOWED THAT THE SURFACTANT ALTERNATING GAS RATIO OF 1: 1 HAS THE MAXIMUM OIL REMOVAL EFFICIENCY AND GENERATING THE FOAM IN A POROUS MEDIA WILL INCREASE THE PRESSURE OF INJECTION.

 
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