Reverse circulation jet pump and reaming stabilizer
OwnerWilliam James Hughesinventor
Life of this patent
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Abstract
A jet pump reamer/stabilizer drilling assembly is used during the underbalanced or near-balanced drilling of an oil, gas, geothermal, or sequestration well or disposal reservoir to create a low pressure zone around the drill bit. The design of this jet pump drilling reamer/stabilizer assembly limits the flow of drilling/power fluid through the drill bit. The drilling fluid circulation behind the drill bit is a conventional flow down the drill pipe and back up through the annulus. The drilling fluid circulation around and up through the drill bit is reverse circulation.
Claims7
A system for drilling an oil, gas, geothermal, or sequestration well or waste disposal reservoir comprising;
- a drill pipe;
- a drilling fluid pumped down the drill pipe;
- a bottom hole assembly attached to the drill pipe, the bottom hole assembly further comprising;
- a jet pump housing containing a jet pump, the jet pump having a venturi system through which the drilling fluid pumped down the drill pipe is directed into an annulus between the wellbore and the drill pipe;
- conduits in the jet pump housing through which some drilling fluid flows from within the jet pump housing via orifices into the wellbore around the drill bit, through the drill bit and venturi system and back to the surface;
- a reamer/stabilizer surrounding the jet pump housing and
- a rotary drill bit attached to the bottom hole assembly.
Dependencies are inferred from the claim text.