Downhole cutting separator
Patent 6176311 Issued on January 23, 2001. Estimated Expiration Date: 
October 27, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 27, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1741497 2332267 2550080 2675879 2710741 2894725 2908332 3102600 3648788 Junk basket and method of removing foreign material from a well InventorAssigneeApplicationNo. 179488 filed on 10/27/1998US Classes:166/99, WITH JUNK RETRIEVING MEANS175/215With tool shaft having plural passages for drilling fluidExaminersPrimary: Tsay, FrankAttorney, Agent or FirmInternational ClassE21B 031/08AbstractA downhole cutting separator is disclosed. The separator can be mounted anywhere on the drillstring. The separator employs a seal which directs the normally circulating fluid during the cutting or milling operation in through an internal passage in the tool. The cutting-laden fluid passes through a slotted liner where the cuttings drop out and are collected in a compartment within the tool. The circulating fluid exits the tool into the annulus. The tools can be used in series so that the lowermost tool takes out the large cuttings, while an upper tool takes out finer cuttings. Provisions can be made to bypass the tool should it become plugged with cuttings by using rupture discs or movable sleeves responsive to pressure differential. A portion of the body assembly can be magnetic to further assist in removal of cuttings as the circulating flow passes through the tool.Other References
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