本刊讯　磨 89井自 1994年投产以来 ,因气层产水、硫化氢含量较高 ,导致井底管柱腐蚀严重。为满足高效开发的需要 ,决定实施井下套管开窗侧钻。川中油气公司应用获国家科技进步一等奖的“川中快速、低耗、优质、高效打井技术”、采用井下动力钻具带巴斯钻头的钻具组合、应用防 The journal wear mill 89 wells since 1994 put into operation since the formation of water, hydrogen sulfide content is high, resulting in serious corrosion at the bottom of the column. In order to meet the needs of efficient development, we decided to implement downhole casing sidetracking. Chuanzhong Oil & Gas Company applied the “Rapid, Low Consumption, High Quality and Efficient Drilling Technology in Central Sichuan Province”, which won the first prize of National Science and Technology Progress Award. The drilling tool combination with downhole power drill with Bath drill bit,