降水井改造为原位生产井的工艺设计及应用

Process design and application of dewatering wells remould to in-situ production wells

为有效地扩大油页岩原位开采区域和节约油页岩原位开采的成本,需将废置的降水井改造成为原位生产井。根据降水井与原位生产井井身结构的相似性,对农安油页岩原位开采先导试验工程基地的降水井改造工艺进行了设计和优化。同时研发了偏心轮式套管割管装置及三爪式套管打捞装置用于拔管施工。工程实践证明,该工艺具有步骤简单、合理、高效以及价格低廉等特点。偏心轮式套管割管装置及三爪式套管打捞装置应用在降水井改造中,均取得理想的效果。

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 procedures,reasonable approach,high efficiency and low cost.Both eccentric-type casing pipe cutter and three-jaw casing pipe fisher have been used in remoulding drainage wells with desired effect.