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为了探索降低浅层井勘探开发成本的有效途径，四川石油管理局钻采工艺技术研究院与局浅层天然气勘探开发总公司合作，在局川西南矿区密切协作下，在观音寺构造大２１井开展了小眼井井身结构、钻井方式、钻井参数优选、钻井取心、井口装置等配套技术应用试验。该井于１９９９年
In order to explore an effective way to reduce the exploration and development costs of shallow wells, the Bureau of Drilling Technology Research Institute of Sichuan Petroleum Administration, in cooperation with Bureau of Superficial Gas Exploration and Development Corporation, We have carried out small hole well structure, drilling methods, drilling parameters optimization, drilling coring, wellhead equipment and other supporting technology application test. The well in 1999