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提出了利用生产测井同时测量的关井压力与续流量并结合最优化处理进行试井分析的方法,有效地消除了井储效应,达到了利用早期压力恢复数据获得地层参数的目的。在变流量基本方程(杜哈美原理)基础上推导出了关井压力变化方程,利用实测续流量和地层参数预估值计算理论关井压力。在最小二乘法的基础上,建立了关于理论压力和实测压力具约束条件的非线性目标函数,约束条件为地层参数的范围和实测流压。用最优化方法求解此目标函数,由计算机不断调整参数预估值使其达到最小,理论压力和实测压力匹配,从而反求地层参数。为了进行对比,文中同时以具有井储效应的均质油藏模型为例计算理论关井压力,用同样的方法求取地层参数。文中处理了三口油井的实测早期资料。从资料的处理和对比结果来看,该所述方法简单、结果可靠,可以作为其它解释方法的对比与验证手段。
The method of simultaneous wellbore pressure and freewheeling measured by production logging and well test analysis combined with optimal treatment is proposed. The well storage effect is effectively eliminated and the formation parameters obtained by early pressure recovery data are achieved. Based on the basic equations of variable flow (Duhamel principle), the equation of shut-in pressure is deduced, and the theoretical shut-in pressure is calculated by using the measured continuous flow and the estimated value of formation parameters. Based on the least squares method, a nonlinear objective function is established for the theoretical pressure and the constraints of the actual pressure gauge. The constraints are the range of formation parameters and the measured pressure. The optimal method is used to solve this objective function. The computer continuously adjusts the parameter estimation to minimize it, and the theoretical pressure matches the measured pressure to reverse the formation parameters. For the sake of comparison, we calculated the theoretical well shut-in pressure by using the homogeneous reservoir model with well-reserve effect as an example to calculate the formation parameters by the same method. The article dealt with the early data of three wells measured. From the data processing and comparison results, the method is simple, the results are reliable, and can be used as a comparison and verification of other means of interpretation.