Gas Hydrate Drilling Technology and Application Research in Wu-li Qinghai South Permafrost Region
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摘要: 在介绍了国内外冻土区天然气水合物勘探开发现状的基础上,针对我国青南冻土区水合物的勘探要求,设计了水合物勘探孔TK-2孔的钻孔结构,合理配置了钻探设备,采用了大直径绳索取心钻进工艺+泥浆制冷技术。同时,分析了冻土覆盖层融化扩孔和钻杆内壁结泥皮现象,并采取了相应的解决措施。野外试验结果表明,钻进台月效率达到702畅07 m,全孔平均岩心采取率为93畅5%,且在孔深229~234 m处岩心有冒泡助燃现象,验证了TK-2孔配套的钻进工艺是切实可行的。Abstract: Based on the introduction of the present situation of exploration and development of permafrost gas hydrates in the world and aiming at exploration requirements of gas hydrate in permafrost region of southern Qinghai, the hole structure of TK-2 is designed and large diameter wire-line coring and mud cooling technologies are used.Moreover, the problems of hole enlarging caused by permafrost melting and mud-cover in the inner wall of drill stem are emphatically discussed with effective solutions being adopted.The field experiment shows that key technologies of TK-2 are feasible.The meterage per rig-month is 702.07 m, the average core recovery rate reaches 93.5% and core bubbling and combustion-supporting are found at the depth of 229~234m.
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Key words:
- permafrost region /
- gas hydrate /
- wire-line coring /
- hole structure /
- drilling tools assembly /
- mud cooling
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