| Chang-10layer, which is belonged to the Ansai oilfield in ordos basin, is a typical low permeability reservoir, with poor reservoir property, low permeability, fine pore throat and high seepage resistance. Since it was developed,, the production of Chang-10in Gao-52wellblock dropped gradually, water ratio rose fast, gas production became higher, sand flow in part of the oil wells resulted in oil pump holddown operation, which had a serious influence on capacity. In order to keep the normal production, in this paper, through the study of laboratory experiment on parameters of low-permeability reservoir (mainly are bottom-hole flowing pressure), the theoretical basis of decision was established accordingly on reservoir parameter optimization of Chang-10reservoir in Gao-52Wellblock. Based on numerous domestic and international literature researches and the actual production conditions of Chang-10reservoir in Gao-52wellblock in Ansai oilfield. Firstly, each unit corresponding fluid condition of Chang-10heterogeneity reservoir in Gao-52wellblock was determined by using Reynolds number criterion based on start-up pressure gradient of indoor experiment. Secondly, the IPR curve on different flow patterns was set up combined with production engineering knowledge and parameters of relative permeability curve, influencing factors of flowing pressure bottom-hole was analyzed. Then the factors of degassing and sand flow rules, their influence on reasonably flowing pressure boundary was studied indoor experiment, the factors such as formation pressure and water ratio of reservoir were considered comprehensively. Finally, mentioned above the theoretical analysis and experimental research, the reasonable boundary of flowing pressure in bottom-hole of different kind well types of Chang-10in Gao-52wellblock was determined, and the theory applied in oilfield practically, which provides theoretical guidance and technical support to develop low permeable oilfield economically and effectively. |
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