Tungsten Used in Oil Well Logging

The use of a generator of high energy neutrons has been known for a long time for neutron-gamma ray or neutron-neutron logging in oil well logging tools. Accordingly, for illustrative purposes, the invention is described in more complete detail in connection with a sealed-tube neutron generator suitable for use in a well logging tool.

The neutron generator includes a hollow cylindrical envelope made of an insulating material such as quartz, glass or ceramic. A closing plate and the target electrode close the opposite ends of the envelope to provide a sealed environment inside the envelope. Gas supply means supplies low pressure gas of deuterium and/or tritium to this envelope. In the preferred embodiment, the gas supply means includes a gas reservoir that includes a helically wound filament of metal (such as tungsten) coated with a metal hydride film (such as a hydride of titanium, scandium, and/or zirconium) or the like as is well known. The ends of the filament are connected to gas supply control circuitry that heats (typically by ohmic heating) the filament and the metal hydride film thereon. The filament and the metal hydride film thereon cools when electric current through the filament is turned off or minimized. The heating (or cooling) of the metal hydride film of the filament results in the emission (or absorption) of deuterium and/or tritium in gaseous form to thereby provide a low pressure supply of these gases (typically on the order of 1-100 millitorrs) and to control gas pressure during generator operation. The gas supply circuitry is preferably located in the sonde outside the NG housing and the gas supply reservoir is located inside the NG housing near the target end of the sealed envelope.

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