A sliding-sleeve technology of perforation-free in sidetracking well is introduced,inclu-ding performance,principle and operation.A139.7 mm casing in completion of sidetrack drill-ing,which mainly solves complicated operation of conventional95 mm (inner diameter is82.25 mm)and 73 shoots +60.3 mm through tubing shooting and the difficulty of stratabound when water bursting.The technology features for its simple operation,less harm to production layers, thus to ensure the cementing quality,quick production,and low cost.%从工具性能、工作原理、施工工艺等方面出发，介绍了一套侧钻井免钻射孔滑套工艺，主要应用139．7 mm套管内开窗侧钻完井，解决了常规侧钻完井采用95 mm套管（内径82．25 mm）固井后下入73枪＋60．3 mm过油管射孔的工序复杂、出水后卡层困难等问题。该工艺施工作业简单，有效减少射孔作业及对产层的伤害，能有效保证固井质量，可达到投产快、费用低等效果。
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