
Full text loading...
The Mishrif carbonate reservoirs in the North-Rumaila and West-Qurna oil fields are impressively characterized by successive-TMF-buildups. These buildups are ranked into 3-specific-reservoir-facies-performance groups, reflecting multiple-vertical-stacking pattern (RFP3-to-RFP1). A Pre-mature water-breakthrough; is seriously expected to be created mostly by RFP1 type, with vast increase in the water-oil-ratio versus continuous decrease in the oil recovery, when these carbonates treated with usual water-oil-displacement technique. To improve oil recovery for Mishrif carbonate reservoirs by overcoming the above expected problems: a modified water-flooding technique is lab-organized and settled by (micro-booster-displacement) methodology; on tens of standard-size-plugs, characterized by multi-TMFs / differential poro-perm buildups, taken from the investigated good-recovery cored intervals in the representative oil-wells from both fields. Suitable economic/soluble polymer with surface active agents were used, and polymerized-alkaline-surfactant-water,PAS-water flooding technique; is performed. A decrease of (10 to 15%) in water-oil-ratio; is successfully achieved after water-breakthrough by successive injections of the prepared controlling agent of (crudeoil-in-wateremulsion) type. An analogy scheme by facies/pore-analogy-system has achieved for the Majnoon domain, and RFP3-to-RFP2 / limited-RFP1 buildup is more matched, with regular / non-constrained petro-link, and limited oil-bypassing zones. The 1st and 2nd stages of the presented water-oil displacement-technique; is of special request for Majnoon carbonates reservoirs development.