NOVELTY - The process involves extruding an elongated component exhibiting an open interior. Another elongated component including an arcuate cross sectional profile is co-extruded by die forming a pair of components including arcuate-shaped lobes around a cylindrical-shaped central sleeve/tube (12). The latter elongated component is bonded to an exterior of the former elongated component such that another open interior is established between the elongated components, and cooling and hardening of the elongated components. Apertures (34) are cross-formed into the former elongated component.    USE - Process for creating a co-extruded pipe i.e. high density polyethylene (HDPE) geothermal pipe, utilized in a geothermal fluid flow application.    ADVANTAGE - The process enables exhibiting a selected pipe with access holes formed into recessed side channels of the pipe for facilitating outflow of grout through a central tube, and provides additional positional stability during in-ground installation. The process allows moderate temperatures in the ground to boost efficiency and reduce the operational costs of heating and cooling systems. The process allows a series of line plates associated with a downstream station from a co-extrusion operation so as to assist in maintaining a consistent exterior profile of the outer extruded lobes. The process enables creating a set of interconnecting pipe sections, which are suitable for communicating a steady fluid downwardly and upwardly along a running length of an embedded pipe and a geothermal gradient exists at certain locations for modifying a feed temperature of the fluid.    DETAILED DESCRIPTION - The arcuate-shaped lobes are selected from a group consisting of a down/inflow lobe (16) and an up/outflow lobe (18). An INDEPENDENT CLAIM is also included for an assembly for producing a co-extruded pipe.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of an HDPE geothermal pipe produced according to a process.    Cylindrical-shaped central sleeve/tube (12)    Down/inflow lobe (16)    Up/outflow lobe (18)    Recessed channels (30, 32)    Apertures (34)