连续油管冲砂解堵在水平井中的应用

Application of Coiled Tubing Sand Washing and Flushing Technology in Horizontal Well

冀东油田G104区块拥有水平井110多口,油藏岩石颗粒胶结疏松,出砂严重;原油属普通稠油,胶质沥青质含量高,凝固点低,导致了水平井筛管段严重堵塞及近井地带导流能力的下降,直接影响了产量。只能依靠除砂、解堵技术来恢复该区的产量。针对该问题,采用外径4.45 cm连续油管+RotoPulseSM旋转脉冲喷射工具+一步酸、半加强型砂盐酸体系进行冲砂、筛管清洗和近井酸化解堵对该区6口水平井实施了作业。作业后产液量和产油量是作业前的1.8倍以上,作业有效期超过200 d,增产效果明显。

The cementation of rock particles in G104 block of Jidong oil field is loose,and much sand has been entering the well bore.The oil is heavy,gum and asphaltenes content is high,and the freezing point is low,which leads to the blocking up of screen pipe and depression of flow conductivity around the well bore,affecting the production directly.The operation used 1 3/4＂ coiled tubing＋RotoPulseSM tools＋one shot acid and 1/2 strength sandstone acid on 6 horizontal wells to solve this problem.After the operation the production of fluid and oil in this 6 wells are all about 0.8 times more than that of before.