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US 5,495,237 AGranted
Measuring tool for collecting down hole information and metering valve for producing mud-pulse used in the same
AssigneeAkishima Laboratories(Mitsui Zosen) Inc.
InventorsHajime Yuasa, Kazuho Hosono, Hikaru Kamiirisa, Keijiro Yamamoto, Hideyuki Miyaji
Life of this patent
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Abstract
A measuring tool for collecting down hole information, which essentially has a sensor sub including plural data collecting sensors secured at a forward portion of a drilling pipe and a sonde movable in the drilling pipe. Both the sensor sub and sonde employ a set of loop antennas to effect radiocommunication between them to thereby certainly send data detected by means of the sensors to the sonde.
Claims8
A measuring tool, operatively connected to a drilling pipe, for collecting down hole information in a shaft, comprising:
- a sensor sub having, at a forward portion of the drilling pipe, plural sensors to collect data;
- a sonde insertable into said drilling pipe and being movable in an upper and lower direction along a central axis in the drilling pipe, for operative connection to said sensor sub;
- a signal sending portion at said sensor sub;
- a signal receiving portion at said sonde;
- a pair of antenna being respectively provided on said sonde and said sensor sub and wherein respective central axes of each said antenna is positioned on the same axis as the drilling pipe;
- said pair of antenna enabling communication from said signal sending portion to said signal receiving portion;
- wherein said pair of antenna include at least one of a loop antenna and a helical antenna;
- and
- wherein said sonde includes a floating device for lifting the sonde through said drilling pipe responsive to conditions in said down hole.
6 more elements
Dependencies are inferred from the claim text.