Liner setting tool and method
Patent 4848469 Issued on July 18, 1989. Estimated Expiration Date: 
June 15, 2008. 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.
June 15, 2008. 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 ReferencesWell bore liner hanger Setting tool with retractable torque fingers Rotatable liner with multiple simultaneously set liner hanger arrangement and method Patent #: 4688642 InventorsAssigneeApplicationNo. 07/206807 filed on 06/15/1988US Classes:166/382, Providing support for well part (e.g., hanger or anchor)166/123, With detachable setting means166/208Liner hangerExaminersPrimary: Neuder, William P.Attorney, Agent or FirmInternational ClassesE21B 43/02 (20060101)E21B 43/10 (20060101) AbstractAn improved setting tool is provided for positioning, setting, and releasing a liner in a subterranean wellbore. The setting tool includes a plurality of fingers, each biased for locking engagement with axially spaced recesses provided in the wall of the tool mandrel axially above a lowermost position of the liner hanger connecting nut. The fingers are automatically forced upward into a release position when interference rollers move radially out of their respective recesses and separate a plurality of axially movable sleeves. Premature release of the liner is avoided by positioning the recesses in the mandrel such that the fingers are in a lock position when the tool string is either in tension or compression. The liner can be rotated after setting the liner hanger, so that the setting tool and drill string can thereafter be reliably retrieved by simple axial pick-up. | |
