Understanding governing fluid flow mechanisms in a mature Omani oil field - A case study

摘要: The Omani field under study was acquired by Petrogas (a local company) from Elf-Oman. extends over 63 km 2 and is a major part of the Butabul permit. Haushi, hydrocarbon-bearing formation, consists tight upper sandstone containing most remaining oil (practically unmoved), dolomite drain which active wells are producing prolific sand that has been nearly swept. A pinchout terminates eastern accumulation characteristic field. Another feature an edge water aquifer attached to contributing pressure support producers. Numerous field-scale reservoir simulation runs were performed understand intricate fluid flow mechanisms, investigate better production options recommend management program. total one hundred eighty carried out initialize model, history match it perform different sensitivities. During preliminary matching exercise, simulating profiles difficult task. turning point superimposition regional pressures, indicated existence three distinct regions. western block aquifer; central combined influence dynamic front significant crossflow pinching into relatively less permeable drain, with waterflooded as well depleted wells. In field, shut-in (W3, W16, W19, W20 W21) produced have watered aquifer. Other (W4, W9, Wll W14) still produce part. W1, W5, W15 W22, located on block, W3, producer converted injector. W8 another contributes production. like W6, W7, W10 Wl 7 due completion mechanical problems. Thereafter, having identified governing mechanisms affected areas, successful campaign achieved in terms estimating initial volumes place, fingerprinting pressures profiles. Prediction sensitivity then followed. Strategies how upgrade performance also established.