新北油田气井选择性堵水技术研究与应用

Research and Application of Selective Water Plugging Technology for Gas Wells in Xinbei Oilfield

针对新北油田垦东区块气井管柱积液严重、排液措施效果不理想、气井严重出水的问题对气井出水进行选择性封堵研究。针对气藏不同水侵类型选用冻胶堵边水、泡沫冻胶隔板堵底水,利用"选择性注入工艺+N2打通道技术"达到选择性堵水的目的。室内优选冻胶配方为0.4%聚合物+0.3%交联剂,评价岩心封堵率大于97%;实验室通过"气驱(测渗透率)-冻胶(注入冻胶封堵)-气驱(测渗透率)"方法评价氮气疏通气体渗流通道效果,疏通后冻胶对气相封堵率小于30%,岩心的渗透率逐渐恢复。在新北油田KD481B-9井进行矿场试验,验证了气井选择性堵水技术的可行性。

In Kendong block of Xinbei Oilfield,there was serious liquid accumulation phenomenon in gas wells,and the effect of drainage measures is not ideal.So the gas wells would produce a lot of water.For this reason,the selective plugging technology was studied for the gas wells.According to different types of water invasion in gas reservoir,plug edge water using gel and plug bottom water using foam gel,and"the selective injection process+N2dredging gas channel technology"was adopted to achieve the purpose of selective water plugging.The gel formula optimized in laboratory is"0.4%polymer+0.3%crosslinker",and the plugging ratio of the evaluation cores is more than97%.The effect of N2dredging gas channel technology was evaluated in laboratory by gas flooding(measuring permeability)gel injectinggas flooding(measuring permeability),and it is shown that after N2dredging,the plugging ratio of gel to gas is less than30%,and the permeability of core is recovered gradually.The feasibility of the selective water plugging technology for the gas wells was verified by the field test of well KD481B9in Xinbei Oilfield.