摘要
针对压裂前测试不产水、压裂后地层产水;由于产水量过大,产油量比压裂前还低的井进行压后产水层的压前预测十分必要。对以往压裂前后试油资料统计分析,把压前测试曲线分为四类,可根据其中两类特征判定压后产水:一类为测试时关井压力恢复速度快,二关井压力接近于初关井压力,压力恢复及其导数双对数曲线下降,有油水边界反映;另一类为测试时初关井压力恢复速度快,二关井压力恢复不起来,压力恢复及其导数双对数曲线具有明显的均质无限大地层特征。现场实际应用证明,能准确判断压后产水情况。
To the problem of the formation not producing water at pre-fracture and producing water at post-fracture,it is very important that the forecast at pre-fracture time for producing water layer of the well whose oil productivity is smaller than that at pre-fracture because of too much of water production.Analyzing testing data of pre-fracture and postfrac,two of the four classified type of testing curves can determine if producing water at postfrac or not.The dropping rate of build-up pressure at closing well time for one type of these testing curves is much big and the pressure at closing well time is close to that at initial closing well time,but the curves of build-up pressure and its derivative double logarithm curve reflects oil and water boundary.Another type of testing curves is that whose resume rate at initial close time is much great and can not build up during the second close well period and build-up pressure and the derivative double logarithm curve is dropping greatly which reflects the infinite reservoir property obviously.The field application proves that can judge the situation of producing water accurately.
出处
《油气井测试》
2007年第2期27-31,共5页
Well Testing
关键词
压裂前
压裂后
测试曲线
产水层
预测
效果
pre-fracture,post-fracture,testing curve,producing water layer,forecast,effect
