水驱气藏废弃压力和地质储量算法修正

CORRECTIONS OF THE ALGORITHMS FOR THE ABANDONED PRESSURE AND GEOLOGICAL RESERVES OF WATER DRIVEN GAS RESERVOIRS

基于刘世常,李闽"确定水驱气藏废弃压力与可采储量的简便方法"文献中将物质平衡方程转化成二元一次方程做出虚拟曲线确定废弃压力的方法存在一定的问题,现根据物质平衡方程分别以废弃压力为自变量做出一元一次方程y1和以可采储量为自变量做出一元一次方程y2,在水驱气藏压降曲线上绘制出y1和y2,两条曲线y1,y2的交点即废弃压力点。废弃压力和可采储量是地面工程和气田开发设计的重要指标,废弃压力越低,可采储量越大,气藏最终的采收率越高,因此确定地层废弃压力十分必要。

In the light of the existed problems of the abandoned pressure determining method by the mapped virtual curve with the help of the binary first equation inverted from the material balance equation reported in the literature of ＂Simple Method of Determining the Abandoned Pressure and Recoverable Reserves of the Water-flooded Gas Reservoir＂written by LIU Shichang,LI Min,et al.,according to the material balance equation,taking the abandoned pressure and recoverable reserves as the independent variables,the primary first equations y1 and y2were established respectively,and then on the map of the water-flooded pressure drop curve of the gas reservoir,Curve y1 and y2were drawn and their intersection point is the abandoned pressure. The abandoned pressure and recoverable reserves are the important indexes of the surface engineering and gas-field development design,the lower the pressure is,the bigger the reserves will be,the higher the ultimate recovery of the gas reservoir will be,therefore it is very necessary for the determination of the abandoned pressure of the formations.