泾河油田裂缝性致密油藏防漏堵漏技术

泾河油田为裂缝性油藏,钻井中普遍存在漏失现象。由于漏失情况复杂,堵漏耗费大量的人力物力,且制约了该油田钻井的提速提效。为此,从泾河油田漏失机理着手分析,考虑水平井水平段的岩屑积聚及钻具偏心,修正了利用环空摩阻法确定漏点位置的模型;筛选出不同颗粒堵漏材料,并进行室内复配实验,分别得出1~6 mm缝宽上部地层及储层的防漏堵漏配方;通过计算实钻中地层裂缝的宽度,选择匹配的配方堵漏,进而形成了泾河油田钻井防漏堵漏技术。通过现场实施,钻井液漏失量降低42.37%,处理井漏时间缩短34.04%,该技术在现场堵漏中具有很好的指导意义。

Loss prevention and control technology for fractured reservoirs in Jinghe Oilfield

With fractured reservoirs in Jinghe Oilfield,there is lost-circulation in drilling.Mud loss control costs a lot of manpower and material resources,and affects drilling speed.To solve these problems,mechanism of leakage is analyzed;considering horizontal cuttings and drilling tools eccentricity,the annulus pressure method to determine the lost-circulation position is corrected;plugging materials of different particle are selected and plugging formula are obtained for 1-6 mm slit width of the upper strata and reservoir,matching formula for mud loss are selected by calculating the real drilling strata crack width.Through the field tests,mud loss reduces 42.37％ and processing time for mud loss shortens 34.04％.The technology has the guiding significance to field plugging.