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In order to effectively expand the area and reduce the cost of the in-situ exploration of oil shales�� abandoned dewatering wells need to remoulded to in-situ production wells�� In consideration of the similarity of well structures between drainage wells and in-situ production wells��several designs and optimizations were employed to the remoulding methods of drainage wells located in the pilot experimental field for exploring Nong'an oil shale�� At the same time��an eccentric-type casing pipe cutter and a three-jaw casing pipe fisher were invented to lift casing pipes�� The practical engineering demonstrated that such a technique has several advantages including simple proce- dures��reasonable approach��high efficiency and low cost�� Both eccentric-type casing pipe cutter and three-jaw cas- ing pipe fisher have been used in remoulding drainage wells with desired effect��