METHOD FOR INSTALLING GEOTHERMAL HEAT EXCHANGERS FOR LOW-GRADE HEAT EXTRACTION Russian patent published in 2018 - IPC E21B7/04 E21B7/20 E21B7/28 E21B33/00 F24T10/10 

FIELD: heating system.

SUBSTANCE: method for installing geothermal heat exchangers for low-grade heat extraction comprises drilling wells using a drill string. Well drilling for the installation of probes is carried out without transferring the drilling rig from one place and at an angle of 20-45 degrees to the horizon. A reinforced concrete ring with a diameter of 1.5 m is installed into the soil, its upper end is buried by 0.3-0.4 m from the surface. A ring area with a width of 0.5 m is arranged at the same level. The bottom of the ring is poured with a concrete blinding. On top of the reinforced concrete ring a well support of the drilling rig is mounted, drilling axis inclination is determined, the drilling rig is mounted on the well support, the concrete ring is used during the drilling process as a sump, and after well completion - as a decompression chamber of the geothermal collector. When the predetermined drilling depth is reached, a replaceable pilot extractor is lowered on the rigid cable to the drill string. After extracting the pilot to the drill string performing the role of a casing pipe, the prepared geothermal probe is lowered, the drill string is screwed with drilling rig rotator and raised by 0.5 m.

EFFECT: reduction in the number of operations, in particular, of lifting the drilling rig, casing the wellbore with a casing pipe, excavating an additional pit or a sump for the drilling fluid circulation, transferring the drilling rig to a new drilling site.

10 cl, 3 dwg