基于压力差转换系数的单井控制储量计算新方法OA

In order to clarify the reserves within the fluid flow range controlled by a single well,a single-well con-trolled reserves calculation new method based on pressure difference conversion coefficient is established by defin-ing pseudo-pressure difference and pseudo-pressure at adjacent moments,combined with the variation law of natu-ral gas high-pressure physical properties and material balance equation.The results show that the error between this method and material balance method is 0.004%,with high accuracy,and the calculation parameters are easier to obtain.The calculated value of single-well controlled reserves increases rapidly with the increase of production time before gradually stabilizing.When the selection time exceeds 300 days until gas well production begins to decline,and the time interval is between 5-10 days,this method has high accuracy and good stability.In conditions of same pressure,the smaller the power exponent β of pressure difference conversion coefficient is,the smaller the high-pressure physical property parameter μZ is(where μ is gas viscosity and Z is gas deviation factor),and the greater the single-well controlled reserves are.The research provides great significance for evaluating geological energy sta-tus,reserve production and oil recovery variation of gas reservoirs.