Invention Grant
- Patent Title: Downhole torque limiting assembly for drill string
- Patent Title (中): 钻柱井下力矩限制组件
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Application No.: US14003109Application Date: 2012-12-19
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Publication No.: US08852004B2Publication Date: 2014-10-07
- Inventor: Alben D'Silva
- Applicant: Halliburton Energy Services, Inc.
- Applicant Address: US TX Houston
- Assignee: Halliburton Energy Services, Inc.
- Current Assignee: Halliburton Energy Services, Inc.
- Current Assignee Address: US TX Houston
- Agency: Fish & Richardson P.C.
- Agent Anthony Iannitelli
- International Application: PCT/US2012/070558 WO 20121219
- International Announcement: WO2014/098832 WO 20140626
- Main IPC: F16D7/04
- IPC: F16D7/04 ; E21B17/06 ; E21B17/04 ; F16D7/10 ; F16D7/00 ; E21B4/00

Abstract:
A method includes a rotary torque limiting assembly including a rotary input member having an internal cavity having sprag receptacles. A rotary output member is disposed within the internal cavity, the secondary rotary member having radial protrusions and recesses. Radial ratchet members are disposed radially between the input member and the output member, each ratchet member having a radially inner surface, and a radially outward surface that includes at least one radially protruding sprag. Bearings are disposed radially between the ratchet members and the output member. A retaining assembly is adapted to provide a compliant force to maintain contact among the ratchet members, bearings, and second rotary member. Each bearing is partly retained between one of the ratchet members and the second rotary member, and each sprag is partly retained within a corresponding sprag receptacle.
Public/Granted literature
- US20140166370A1 Downhole Torque Limiting Assembly for Drill String Public/Granted day:2014-06-19
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