Boring or penetrating the earth – With signaling – indicating – testing or measuring
Patent
1996-11-18
1998-10-06
Dang, Hoang C.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
175320, E21B 4701, E21B 1700
Patent
active
058163441
ABSTRACT:
An apparatus for joining one pipe section that contains a pressurized fluid, such as a pipe section formed from a non-metallic material in the sensing section of a drill string, to another pipe section so as to minimize the pressure gradient acting across the joint. An inner sleeve is installed within the pipe section so as to extend across the joint, thereby forming an annular chamber between the inner sleeve and the joint. Seals at the ends of the inner sleeve prevent the fluid flowing within the pipe section from flowing into the annular chamber. A vent hole allows fluid flowing outside the pipe section to enter the annular chamber and pressurize it to the same pressure as the fluid, thereby equalizing the pressure across the joint. Alternatively, the annular chamber can be filled with an incompressible fluid and a pressure balancing piston used to equalize the internal and external pressures acting on the joint. Or the annular chamber may be sealed from the pressures acting on the pipe section so that only a compressive force acts on the joint.
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