作　　者： ; ; ; ; ; (肖平）;

机构地区： 中国地质大学北京工程技术学院

出　　处： 《大庆石油地质与开发》 2010年第4期156-159,共4页

摘　　要： 为研究水驱后气驱的窜流特性，在水驱油模型的基础上推导了气驱窜流突破公式，研究了均质和非均质，混相和非混相，以及垂直方向的气窜特性，指出混相形成段塞式驱替，非混相一定发生突进，但突进很小。加入表面活性剂形成泡沫或增加压力达到混相等方法可以达到增加驱替相的黏度，减少气相渗透率和气窜的目的。通过水气交替注入和加入聚合物等材料，降低驱替相的相渗透率，可以减少黏性指进。混相与非混相时，都是高渗透层突破快，指出发生窜流主要是因为地层非均质引起的前缘突破时间不同。在垂直方向，上部地层压力高于下部地层，流体处于连续状态，气体无法上窜，上部流体流入下部；下部地层压力高于上部，出现黏性指进，存在高渗透层则出现舌进。裂缝的存在只是加快窜流速度，窜流前缘突破时间大大减少。在容积器皿中的气液分离效应是重力分离，多孔介质中是黏性指进和高渗透层窜流。 In order to make clear the channeling characteristics in gas drive after waterflooding, channeling formula of gas drive is deduced on the basis of waterflooding model. Reaseach on channeling characteristics under the condition of homogeneous and heterogeneous, miscible and immiscible, and vertical motion are conducted, which shows slug and slight advancement will occur during miscible and immiscible displacement, respectively. Adding surfactant produces foam and increases pressure, therefore miscible flooding is realized, which increases the viscos- ity of displacing phase, decreases gas permeability and diminishes gas channeling. Water alternating gas injection and polymer added injection may decline displacing phase permeability and viscous fingering. During miscible and immiscible flooding, breakthrough occurs in high permeability zone. Channeling is mainly due to the front breakthrough at different times in heterogeneous reservoirs. In vertical direction, when the pressure of the upper forma- tion is higher than that of the lower and as fluid is in a continuous state, gas can not flow upwards and fluid in the upper part flows into the lower part ; when the pressure of the lower formation is higher than that of the upper forma- tion, viscous fingering and coning advance in high permeability layer occurs. Channeling velocity is quickened due to the existence of fractures. The front breakthrough time of crossflow reduces significantly. The knockout effect- gravity separation in volumetric utensils appears. Viscous fingering and channeling flow along high permeability layers occur also in porous media.

关 键 词： 气驱 窜流 均质 混相 气液分离 理论研究

领　　域： [石油与天然气工程]