Communications – electrical: acoustic wave systems and devices – Wellbore telemetering
Patent
1981-06-01
1985-07-30
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
367 83, 340853, 324369, G01V 140
Patent
active
045326142
ABSTRACT:
Discloses a well bore electrical generator for a subsurface measuring system incorporating a rotary liquid seal protection system adapted to be actuated by flow of drilling mud through the drill pipe. System includes a sealed housing defining a first chamber separated from a second chamber with the chambers being filled with a sealing liquid. A rotatable shaft driven by an impeller extends from outside the housing into the first chamber through a rotary seal connected to establish a liquid seal between the housing and the shaft. Means are provided for maintaining the fluid pressure of the sealing liquid within the chambers to be equal to the fluid pressure of the drilling mud outside the housing. A rotatable pump connected to the shaft is adapted to pump the sealing liquid from the second chamber into the first chamber. A liquid pressure regulator is connected to regulate a return flow of sealing liquid from the first chamber to the second chamber and control the fluid pressure of the sealing liquid applied to the rotary seal from inside the first chamber to be greater than the fluid pressure applied to the rotary seal by the drilling mud from outside the housing.
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patent: 4319240 (1982-03-01), Stone et al.
McDonald et al., "Borehole Telemetry System is Key to Continuous Downhole Drilling Measurements," 9/15/75, Oil and Gas Journal, pp. 111-118.
Bradley James E.
Lobo Ian J.
Moskowitz Nelson
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