| Chengdao Oilfield have been placing on production in 2000 with the natural energy development, and we started water injection development in 2003. At present only 9.2% recovery level, the degree of recovery is low. According to the development experience of the onshore oilfield and the master plan of Chengdao Oilfield, weresearch the upper Guantao formation comprehensively and scientifically. The strategy of adjustment in Guantao Formation, Chengdao Oilfield were subdivision of stratum, well pattern thickening, drilling horizontal well and so on. We had completed the adjustment of 6 Blocks of Chengdao Oilfield respectively during 2006-2012—the Middle Area and CB22G-25 G Well Area, for example. We next implementdevelopment adjustment in Northwest Block.This paper analysised the current status of exploitation and the remaining oil potence of the upper Guantao Formation in the Northwest Block. We studied the correlation of strata carefully and the correspondence between the correlation of strata and oil sand according to the subdivision principal of sedimentation unit. The upper Guantao Formation has been divided into 7 sand groups and 3 layer systems. Through the research of the development status of reservior, we build the 3D reservior model, recaculate the geological reserves and confirm the mainlayerand the recovery percent of reserves. Based on the basic scheme of development evaluation, sums up the current mining problems and causes, provides the reliable basis for the adjustment of development by comparison with the adjusted block. The water flooded condition and remaining oil distribution were analyzed by means of numerical simulation, the mean residual oil saturation is 0.57, the remaining oil reserves is relatively large. It is estimated that the degree of reserve recovery will reach 32.3% in 15 years, the cumulative oil production will reach 389×104t, provided a guarantee for the efficient development of Chengdao Oilfield. |
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