A Study On Encryption Adjustment Method In Block East 18 Of Yushulin Oilfield

Yushulin oilfield belongs to the typical characteristics of low permeability, low production and low abundance in a large oil field, reservoir physical property is poor, flow resistance large, in the actual production process showing initial yield is low, the production decline rapidly and water injection effect is slow and development characteristics. East Block18 now well pattern of sand body of poor control, control degree of water flooding in low,only 50%, with the extension of mining time, water cut wells rose at a faster pace, "thin note thick mining reservoir producing degree low, stabilizing oil production and controlling water gradually increase the difficulty. In order to improve the control degree of water flooding and the utilization degree of water drive reserves, to tap the potential of the whole area, to improve the final recovery, to carry out the research on the method of the East 18 well area encryption adjustment.In this paper, through the analysis of the structural characteristics, fault, fracture development, sedimentary microfacies, reservoir characteristics, fluid properties and oil water distribution in the East 18 well area, the influence of the development of the oil and water distribution is analyzed. On the basis of fine geologic research, the petrel software is used to establish the facies controlled geological model of the 18 block. After the East Block 18 the development effect evaluation, including the development status, water flooding condition analysis, formation pressure keep degree analysis and water drive producing condition evaluation, analysis of oil producing capability, encryption the main problems existing in the understanding of the effect and understand the development. Then, the Eclipse numerical simulation software was used to simulate the history of water drive, and the distribution and types of remaining oil in each oil layer were determined. Finally, the technical and economic limits of the encryption adjustment are studied, including the reasonable well density, the single well limit oil production, the effective thickness of the single well limit, the limit well spacing and so on. Through dynamic analysis of 18 east area well, combined with the study of remaining oil, determined to use in the well network center deviates from the mainstream line encryption a wells encryption and determine the design scheme of cloth well, the prediction of ultimate recovery factor and increase recoverable reserves.