A well conduit system, comprising: a first circumferentially elastic outer conduit wall; at least one second circumferentially elastic inner conduit wall positioned within the first circumferentially elastic outer conduit wall to define an annulus between the first circumferentially elastic outer conduit wall and said at least one second circumferentially elastic inner conduit wall; a plurality of radial load surfaces (5, 6, 41, 42, 49, 123) extending across the annulus and radially between at least two of said conduit walls to concentrically abut against at least one other of said conduit walls to form at least two elastic hoop stress adjoined pipe bodies with at least one concentric annulus space between said at least two elastic hoop stress adjoined pipe bodies and said plurality of radial load surfaces, wherein one or more passageways through subterranean strata is formed by inserting an inner pipe body comprising said at least one second circumferentially elastic inner conduit wall into an outer pipe body comprising the first circumferentially elastic outer conduit wall, wherein the inner pipe body comprises an outer diameter greater than an inner diameter of the outer pipe body, and wherein the inner pipe body is inserted into the outer pipe body below at least one wellhead assembly, using a circumferentially elastic expansion of said outer pipe body and a circumferentially elastic compression of said inner pipe body resulting from a hoop force exerted therebetween, and wherein the release of said hoop force after said insertion releases said circumferentially elastic expansion and said circumferentially elastic compression to abut said plurality of radial load surfaces of said outer pipe body to said inner pipe body for forming adjoined pipe bodies, and to cause a concentric sharing of elastic hoop stress resistance between said adjoined pipe bodies for forming a greater effective wall thickness that is capable of containing higher pressures than said conduit walls could otherwise bear without said concentric sharing of said elastic hoop stress resistance. a first circumferentially elastic outer conduit wall; at least one second circumferentially elastic inner conduit wall positioned within the first circumferentially elastic outer conduit wall to define an annulus between the first circumferentially elastic outer conduit wall and said at least one second circumferentially elastic inner conduit wall; a plurality of radial load surfaces (5, 6, 41, 42, 49, 123) extending across the annulus and radially between at least two of said conduit walls to concentrically abut against at least one other of said conduit walls to form at least two elastic hoop stress adjoined pipe bodies with at least one concentric annulus space between said at least two elastic hoop stress adjoined pipe bodies and said plurality of radial load surfaces, wherein one or more passageways through subterranean strata is formed by inserting an inner pipe body comprising said at least one second circumferentially elastic inner conduit wall into an outer pipe body comprising the first circumferentially elastic outer conduit wall, wherein the inner pipe body comprises an outer diameter greater than an inner diameter of the outer pipe body, and wherein the inner pipe body is inserted into the outer pipe body below at least one wellhead assembly, using a circumferentially elastic expansion of said outer pipe body and a circumferentially elastic compression of said inner pipe body resulting from a hoop force exerted therebetween, and wherein the release of said hoop force after said insertion releases said circumferentially elastic expansion and said circumferentially elastic compression to abut said plurality of radial load surfaces of said outer pipe body to said inner pipe body for forming adjoined pipe bodies, and to cause a concentric sharing of elastic hoop stress resistance between said adjoined pipe bodies for forming a greater effective wall thickness that is capable of containing higher pressures than said conduit walls could otherwise bear without said concentric sharing of said elastic hoop stress resistance.