一种新的溶解气可采储量预测模型

A New Model of Estimating Recoverable Reserves of Solution Gas

在实际生产过程中,由于储层非均质性,以及开发后期为了控制含水的上升,油藏中局部地区的压力会降到饱和压力之下。对于这种驱动类型以水驱为主,同时存在溶解气驱的情况,在预测溶解气可采储量时,采用现行的累积产油量与累积产气量线性关系曲线法的结果会偏大,而利用累积产油量与累积生产气油比线性关系曲线法的结果会偏小。实际应用表明,基于衰减预测模型的方法结果可靠。

During practical production,due to heterogeneity and control ascending of water cut latterly,reservoir pressure will be below bubble point pressure locally.In the case that water drive predominates and depletion drive is secondary,the reserves forecasted by the linear relationship between cumulative oil production and cumulative gas production is larger than real recoverable solution gas,but the reserves forecasted by the relationship between cumulative oil production and cumulative gas-oil ratio is smaller than real recoverable solution gas.On the basis of attenuation model,a new model is put forward,which applies to the case that producing oil-gas ratio descend decreasingly.The practical application indicates that the new model is reliable.