CAJ | 학술논문

为了扩大单井控制面积，提高储层动用程度，增加单井产量，在哈萨克斯坦 K 油田进行了一口双分支水平井两分支分别酸化措施后合采的先导性试验。根据该油田储层、岩性和物性特征，确定了与储层配伍性较好且具有自转向功能、储层污染小的清洁自转向酸体系作为主体酸。为了达到提高水平段均匀改造程度和后期快速返排的目的，使用了氮气暂堵技术和液氮暂堵技术，并对施工压力、排量、连续油管拖动速度等参数进行了优化。酸化后分析表明，两个分支都起到了酸化解堵、恢复产能的目的，且单支产量与其邻井产量相当，说明双分支水平井酸化工艺在该油田具有较好的应用效果。
위료확대단정공제면적，제고저층동용정도，증가단정산량，재합살극사탄 K 유전진행료일구쌍분지수평정량분지분별산화조시후합채적선도성시험。근거해유전저층、암성화물성특정，학정료여저층배오성교호차구유자전향공능、저층오염소적청길자전향산체계작위주체산。위료체도제고수평단균균개조정도화후기쾌속반배적목적，사용료담기잠도기술화액담잠도기술，병대시공압력、배량、련속유관타동속도등삼수진행료우화。산화후분석표명，량개분지도기도료산화해도、회복산능적목적，차단지산량여기린정산량상당，설명쌍분지수평정산화공예재해유전구유교호적응용효과。
In order to increase single well control area, producing degree and production of single well, a pilot test of bi-lateral horizontal well acidizing was conduced in K oilfield, Kazakhstan. First, clean self-diverting-acid system was chosen as the main acid, which has self-diverting and little formation pollution, based on the characteristics of the reservoir, lithology and physical properties of this oilfield. Besides, nitrogen and liquid nitrogen were used to temporarily block high permeability layers and make the acidizing more uniform. They can also accelerate flowing back velocity of residual acid. Treating pressure, pumping rate, and coiled tubing drawback velocity were optimized. The analysis after acidizing shows that acidizing worked in plugging removal and productivity restoration in both branches, and the production of single branch equals to its neighbour well separately. This means that bi-lateral horizontal well acidizing can get good application effect in this oilfield.