介绍了一种针对低渗透油田普遍存在的井筒及近井地带堵塞的处理技术——低密度负压泡沫洗井解堵配套技术，利用低密度泡沫流体在负压条件下冲洗井筒，返排脏物，处理液解除近井地带有机和无机物造成的复合堵塞，研究和完善了相应的泡沫洗井液、油层处理液、泡沫发生器、井下洗井器和施工工艺。该技术的大面积推广应用，有效地提高了单井产油量，平均单井日增油２.６ｔ，延长了检泵周期，取得了显著的成效。 Aiming at the common blockage technology of wellbore and near wellbore in low permeability oilfield, the technology of low density negative pressure foam well washing and plugging is introduced. The low density foam fluid is used to flush the wellbore under negative pressure and return dirty Materials and treatment solutions relieve the compound blockage caused by organic and inorganic substances in the near wellbore. The corresponding foam washout fluids, reservoir treatment fluids, foam generators, downhole washer and construction techniques were studied and improved. Large-scale popularization and application of this technology has effectively raised the single-well oil production, increasing the average single well daily oil 2.6t, extending the inspection pump cycle and achieved remarkable results.