分子膜/混合有机酸复合解堵技术在姬塬油田欠注井的应用

针对姬塬油田欠注井现象日益严重、堵塞物类型复杂造成常规酸化无法同时解除多种堵塞等问题，从堵塞物分析和解堵机理入手，研究了一种适用性较广的分子膜/混合有机酸复合解堵体系，主要由混合有机酸、新型分子膜、解聚剂和助剂组成。实验结果表明，该复合解堵体系具有优良的解堵性能，对现场垢样的溶垢率普遍能达到80%以上，对聚合物的降黏率可达到90%以上，适用于深部解堵，且能够有效避免二次沉淀的产生。现场应用效果表明，分子膜/混合有机酸复合解堵技术能够有效降低注水压力，提高日注水量，适用于大部分欠注井的地层改造。

Application of molecular film/mixed organic acids combined blockage removal technology in under-injection wells of Jiyuan Oilfield

In Jiyuan Oilfield, the problem of under-injection well is increasingly serious, and there are a variety of blockages. Conventional acidizing cannot remove various blockages simultaneously. To solve this problem, this paper researched and developed a molecular film/mixed organic acids combined blockage removal technology of wider applicability by analyzing blockages and blockage removal mechanisms firstly. This new technology includes mainly mixed organic acids, novel molecular film, depolymerizing agent and additive. Experimental result shows that this combined blockage removal system has strong blockage removal capacity. Its dissolution ratio of field fouling samples is generally over 80% and its viscosity reduction ratio of polymers is over 90%. It is applicable to in-depth blockage removal and can effectively avoid secondary precipitation. Field application effect shows that the molecular film/mixed organic acids combined blockage removal technology can effectively reduce water injection pressure and improve daily water injection and is applicable to the reservoir stimulation of most under-injection wells.