Well bore electrical generator

Patent · Tue Jul 30 04:00:00 EDT 1985

OSTI ID:6434641

Peppers, J M

This patent 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.

• Assignee: EDB-86-005034
• Patent Number(s): US 4532614
• OSTI ID: 6434641
• Country of Publication: United States
• Language: English

Related Subjects

440400* -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
COMMUNICATIONS
CONTROL
DATA TRANSMISSION
DESIGN
DRILL PIPES
DRILLING EQUIPMENT
DRILLING FLUIDS
ELECTRIC GENERATORS
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
FLUIDS
MACHINE PARTS
MWD SYSTEMS
PIPES
PRESSURE CONTROL
SEALS
SHAFTS
SIGNALS
WORKING FLUIDS