| 摘要 |
<p>An electrical two-way transmission system and method of constructing an electrical coaxial conductor assembly for a tubular fluid conductor composed of lengths of electrically conductive pipe having their ends connected in spaced relationship by external couplers, such as a well drill string having screwthreaded coupling collars connecting the ends of adjacent lengths of drill pipe, wherein said pipe and couplers provide an outer electrical conductor. An inner electrical conductor for the coaxial assembly is provided by tubes of thin ductile electrically-conductive material disposed within the outer conductor pipe, each inner conductor tube being electrically insulated from each pipe length by a complementary sheath of elastic dielectric liner material which envelopes said tube, the extremities of each sheathed tube being flared into conformity with the interiors of the end portions and transverse end faces of each pipe so as to anchor said tube against relative displacement, each sheathed tube being permanently deformed radially outward into contiguous conformity with each pipe interior and its end faces with each liner sheath expanded into sealing engagement therewith. An annular body of elastic dielectric material is disposed between the ends of adjacent pipe or within each pipe coupler and between the flared extremities of adjacent inner conductor tubes for insulating said tube extremities from adjacent pipe and coupler surfaces and has contact means for electrically connecting adjacent tubes to each other. The coupling of adjacent pipe deforms the annular body therebetween into fluid tight engagement with the tube extremities and adjacent pipe and coupler surfaces.</p> |
