Evaluation Of Development Effect And Study On Potential Exploitation In Block S70

The recovery factor of block S70 is 23.1%,the production of single-well is fairly low with the water cut of 88.5% at present.A set of comprehensive adjustment scheme is put forward based on the evaluation of development effect and the stuty of potential exploitation with the purpose of improving production,controling the rise of water cut and achieving the aim of enhancing oil recovery.Firstly,the delopment effect during the past 20 years was evaluated in detail from the status of reserves,the adaptability of formation and well pattern,the development effect of waterflooding,energy level and the recovery by using reservoir engineering theories.Secondly,a geological model was established by Petrel according to the data of block S70,then getting accurate geological model by history match and the distribution of remaining oil was obtained.Finally two comprehensive adjustment schemes were designed according to the distribution characteristics of remaining oil and the problems existing in the development.The better scheme was determined by numerical simulation.By the study of evaluation of development effect and remaining oil distribution,the results show that the potential sections of sand group 2 are mainly distributed in the south of well S70-01 and the north of well S70-1.Well S70-XN52 can not form effective injection-production relationship with the water wells of S70 and S70-1 because of the obstruction of the southwest fault in sand group 2.There is a problem that only water injection and not oil recovery in the north of well S70-1,so it exists the problem of remaining oil enrichment.The potential sections of sand group 4 are mainly distributed in the areas of wells S70-2,S70-6,S70-02,north of S70-65 and the east of S70-X11.