Title: In-hole motor drill with locking bit clutch

Abstract: An in-hole motor drill assembly has the rotor of the motor which may be connected to the drill bit through a shaft connected to the rotor, and a housing which may be connected to the running string, and a normally disengaged clutch between said housing and said shaft. Means are provided for engaging the clutch by exerting a negative force on said housing, which is applied to the shaft by a pick-up bearing, if the bit is stuck against upward movement. The shaft can be rotated by rotation of the running string. In normal operation, during drilling, the clutch is disengaged to permit the shaft to rotate relative to the housing. The bearing which picks up the shaft and bit, during normal off-bottom circulation or retrieval of the assembly, is constructed to permit longitudinal movement of the housing relative to the shaft, when the bit is stuck, to engage the clutch.

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Inventors: Crase, Gary M. (Cypress, CA)
Tschirky, John E. (Long Beach, CA)

Application Number: 06/271656
Filing Date: 1981-06-08
Publication_date: 1983-06-07
Assignee: SMITH INTERNATIONAL

Primary Class(es): 175/101 175/107
Other Classes: E21B4/00; E21B4/02; E21B4/02
US Patent Ref:

4187918	February, 1980	Clark	418/48	Down-hole earth drilling motor capable of free circulation
4232751	November, 1980	Trzecial	175/101	In-hole motor drill with bit clutch

Other Refs: SU291027SU395557

November, 1971	192/91A
November, 1973	175/101

Primary Examiner: Pate III, William F.
Assistant Examiner:
Attorney: Subkow, Philip

Parent Case Data:

This application is a continuation of application Ser. No. 067,924, filed Aug. 20, 1979, now abandoned. <