Well tool for detecting well bore deviation in drill string
Patent
·
OSTI ID:6199039
A well tool for detecting well bore deviation which includes a tool adapted to be connected between adjacent components of a drill string, including a longitudinal opening through which drilling fluid can be circulated. At least one vent hole is located in the tool wall for communicating the longitudinal opening with the space outside the tool through which drilling fluid is circulated back to the surface, the vent hole being selectively blocked and unblocked. The angle the tool has deviated from vertical is measured and the vent is unblocked at a time interval after weight is placed on the bit which is determined by the amount of deviation of the tool, the unblocking of the vent causing a pressure drop in the drilling fluid in the tool the timing of which indicates the amount of deviation.
- Assignee:
- EDB-83-096594
- Patent Number(s):
- US 4370814
- OSTI ID:
- 6199039
- Country of Publication:
- United States
- Language:
- English
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