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修井是一项为恢复油气井的正常生产所进行的解除故障、完善井眼条件的工作。如果修井液与储层流体和储层矿物不配伍以及滤失量过大就会造成储层损害。文章以卫126井为例，对低压气井低伤害修井液的优选作了详细研究。针对地层高温、高渗透率、强水敏和强盐敏 的特征,把修井液盐度提高到12．5％，通过抗温抗盐有机降失水剂的滤失筛选实验、岩心伤害实验和修井液滤液表面张力评价实验，研制出性能优良的修井液配方TC2－5，并成功地应用于卫126井的修井作业，取得了“能压住井、压而不死、低伤害”的应用效果。

Research on Low-damage Workover Fluid for Low-pressure Gas Well

Well workover is a work of rescinding faults and improving borehole conditions so as to restore the normal production of oil and gas wells and reser voir damage occurs because of the mismatch of workover fluids with the fluids an d minerals in reservoir and of the oversize filtration of the workover fluids.By taking the well Wei-126 as an example,the optimization of low damage workover fluids for low pressure gas wells was studied in detail.In light of the reservo ir characteristics,as high temperature,high permeability,strong water sensitivit y and strong salt sensitivity,etc.,to raise the salinity of workover fluid to 12 .5%,a workover fluid formulation TC2-5 with good performance was developed throu gh the filtration screening experiment of organic heat resisting and salt resi sting filtrate reducer,the experiment of core damage and the evaluation experime nt of the surface tension of filtrate of the workover fluid,and it was successfu lly applied to the workover operation in the well Wei-126 and a good application effect was obtained,i.e.carrying out a balanced pressure workover with low dama ge.