A Study On Balance Exploitation By Optimization Of Allocation Production Of DongFang Gas Field

DongFang1-1gas field is the first self-operation project of of Zhangjiang.of CNOOC China limited.It is located in the Yinggehai Basin of the Northern South China sea which has a large eare but low concentration storage with obvious reservoir heterogeneity characteristics, The CO2distributing is very complex in gas reservoirs. DF gas field has been exploited and produced natural gas stably for7years. But during the natural gas expoitation, some case emerged as follows:1.DF Gas reservoir consisted of different blocks with obvious different characters. The pressure drawdown varied in different gas reservoir block2.The producing reserves of differeng gas layers are not the same extent3.The rich hydrocarbon gas well and the poor hydrocarbon gas well(consist of much carbon dioxide) have been exploited in an unbalanced way. It will bring bad effection to the process of long time production for the DF gas field.In order to supply steady and qualified fuel gas for the downstream users,In this paper,The dynamatic producing characters of gas field has been analysised based on actal production data and test data. The producing reserves has been calculated through collecting the actual test data of reservoir pressure. And that,the extent of gas exploitation has been analysised. The capacity of gas feild production has been estimated,and the period of stable production of the gas field has been predicated. According to the requirements of the users for gas quality (especially the requirements of component of gas), The rich hydrocarbon gas well and the poor hydrocarbon gas well has been designed to exploited in a balanced way because of the single gas well’s different gas composition. Reference has been supplied to realize the gas field steady and long time production based on optimizing the proration schedule of the individual well and the gas reservoir.