反褶积试井解释方法在东海油气田中的应用

Application of Deconvolution Well Testing Method in EastSea Oil & Gas Field

海上油田关井压力恢复测试时间一般比较短,凝析气井受井筒相态变化影响较多。常规试井及现代试井分析方法很难准确解释油藏外边界。反褶积试井解释方法综合利用杜哈美原理和叠加原理,结合最优化技术,根据井的所有生产压降数据和关井压力恢复数据,最终虚拟计算出一套全部开关井时间内的定产量压降数据,由于时间足够长,压力双对数导数曲线各个流动阶段比较完整,边界特征易于辨认,能够准确地识别油气藏外边界[1]。解决了上述问题,且在东海油气田取得了较好的应用效果。

The testing time of buildup test for shut-in pressure in offshore oilfields is generally short,so the influence of the phase state changing to condensate gas wells is serious. It is very difficult to accurately explain the outer boundary of an offshore oil reservoir by the conventional well-test methods and the modern well-test analysis. Combined with optimization techniques,deconvolution well testing interpretation method utilizes Duhamel principle and the principle of superposition comprehensively to virtually compute a set of drop off pressure data on fixed yield within whole time of opening and close well. Due to the long testing time,each mobile phase of double logarithmic derivative pressure curve is more complete,whose boundary feature is easily recognized,which can accurately identify the reservoir outer boundary to solve the above problems,and the good applied effect in the East China Sea oil and gas field has been achieved.