Paper Information

Title: 

ROLE OF COMPOSITIONAL GRADING IN A CO2 INJECTION PROJECT; A CASE STUDY

Type: PAPER
Author(s): MOKHTARI RASOUL*,ASHOORI SIYAVASH
 
 *PETROLEUM ENGINEERING DEPARTMENT, PETROLEUM UNIVERSITY OF TECHNOLOGY, AHVAZ, IRAN
 
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: 

IN ANY COMPREHENSIVE RESERVOIR STUDY THE FIRST STEP IS AN ACCURATE ASSESSMENT OF THE SPATIAL DISTRIBUTION OF THE FLUID COMPONENTS IN BOTH HORIZONTAL AND VERTICAL DIRECTIONS. COMPOSITIONAL GRADING, WHICH REFERS TO VARIATION IN FLUID COMPOSITION WITH DEPTH, HAS BEEN OBSERVED IN MANY RESERVOIRS. IN MOST CASES, THE OIL DENSITY AND HEAVY COMPONENTS COMPOSITION INCREASE WITH DEPTH WHILE METHANE AND OTHER LIGHT COMPONENTS COMPOSITION DECREASE WITH DEPTH. SUCH A COMPOSITIONAL GRADING CAN HAVE A SIGNIFICANT INFLUENCE ON VARIOUS ASPECTS OF RESERVOIR DEVELOPMENT. WHEN CONSIDERING GAS INJECTION, ONE MUST BE AWARE THAT COMPOSITIONAL EFFECTS (SUCH AS THE DEVELOPMENT OF MISCIBILITY) CHANGE WITH DEPTH.
IN THIS WORK ONE OF THE SOUTHWEST IRANIAN OIL RESERVOIRS WAS SELECTED. THE RESERVOIR UNDER STUDY WAS A LOW SHRINKAGE UNDERSATURATED OIL RESERVOIR WITH THE OIL API GRAVITY OF 30. TWO SIMULATION MODELS OF CO2 INJECTION FOR ENHANCED OIL RECOVERY (EOR) PROCESS WERE PREPARED, ONE WITH CONSIDERING COMPOSITIONAL GRADING, AND THE OTHER FOR UNIFORM FLUID CONDITION. TWO MODELS WERE COMPARED AND THE EFFECT OF COMPOSITIONAL GRADING ON OPTIMUM INJECTION RATE AND RECOVERY FACTOR WAS STUDIED. CONSIDERING COMPOSITIONAL GRADING RESULTS IN A MORE REALISTIC BUT MORE COMPLEX SIMULATION MODEL, AND SIMULATION RUN TIME WOULD INCREASE, BUT BECAUSE OF THE DRASTIC DIFFERENCE BETWEEN THE RESULTS OF THE TWO CASES, IT CANNOT BE IGNORED.

 
Keyword(s): COMPOSITIONAL GRADING, ENHANCED OIL RECOVERY, CARBON DIOXIDE, OPTIMIZATION, FIELD DEVELOPMENT, RESERVOIR SIMULATION
 
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