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2. 发明申请

WO2012177637A1 CORE CAPTURE AND RECOVERY FROM UNCONSOLIDATED OR FRIABLE FORMATIONS 审中-公开
标题翻译：核心收购和恢复从不合并或可变形式
公开(公告)号：WO2012177637A1
公开(公告)日：2012-12-27
申请号：PCT/US2012/043145
申请日：2012-06-19
申请人： CONOCOPHILLIPS COMPANY , HEDGES, James H. , BEARDMORE, David H.
发明人： HEDGES, James H. , BEARDMORE, David H.
IPC分类号： E21B25/00
CPC分类号： E21B49/02 , E21B21/003
摘要： Methods and systems for enhanced capture and recovery of core samples from unconsolidated or friable formations are provided using drilling fluids that permit increased overpressures to preserve the ability to cut core samples and to strengthen the core samples obtained. Drilling fluids used during capture and recovery of core samples may comprise a solid particulate loss prevention material having a size range from about 150 microns to about 1,000 microns. The solid particulate loss prevention material prevents fracture initiation and propagation in the subterranean formation to allow the use of higher overpressures than would otherwise be possible. Thus, by circulating drilling fluid in the borehole while drilling a core sample, higher overpressures may be achieved, which have been found to be beneficial during core capture and recovery by maintaining core integrity and avoiding core loss. In this way, core sample integrity is improved, yielding more accurate representations of the subsurface.
摘要翻译：使用钻井液提供从未固结或易碎地层强化捕获和回收岩心样品的方法和系统，其允许增加的超压以保持切割芯样品的能力并加强所获得的核心样品。捕获和回收核心样品期间使用的钻井液可包括尺寸范围为约150微米至约1,000微米的固体颗粒物防止损失物质。固体颗粒物丢失防止材料防止地层中的断裂发生和扩散，以允许使用比否则可能的更高的超压。因此，通过在钻探核心样品的同时在钻孔中循环钻井液，可以实现更高的超压，这已经被发现在核心捕获和回收期间通过保持核心完整性和避免铁心损失是有益的。以这种方式，核心样本完整性得到改善，从而产生更准确的地下表示。

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