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针对膏盐层的安全钻井关键技术,系统的分析了膏盐层特殊而复杂的作业环境和条件所导致的埋钻、卡钻、下套管困难等作业不利情况;有针对性的提出了钻膏盐层的有关钻井液使用和处理、防埋钻、卡钻等工艺技术对策。结合元坝271井在雷四到飞四段(井段:4961-6506m)钻遇大段膏盐层的实际情况,就泥浆维护及钻具安全方面给出了具体的处理对策,取得了良好的效果。
In view of the key technology of safe drilling for gypsum salt layer, this paper systematically analyzes the unfavorable working conditions such as burying, jamming and under casing caused by the special and complicated operating environment and conditions of gypsum salt layer; Gypsum salt drilling fluid use and handling, buried drill, stuck and other technology and technology measures. Combining with the actual situation of Yuanba 271 drilling a large section of gypsum salt from Lei4 to Fei4 (well section: 4961-6506m), the concrete treatment measures for mud maintenance and drilling safety are given and good results are obtained Effect.