Apparatus for a pipe string of a geological drill hole, pipe string, method for operating a geological drilling gear and method for producing a pipe string for a geological drill hole

Abstract

The invention relates to an apparatus for a pipe string of a geological drill hole, with a pipe string element and a fluid supply line which is arranged outside the pipe string element, extends along the pipe string element and is connected to a fluid injection device on the pipe string element, by means of which a fluid supplied through the fluid supply line can be introduced into an inner space of the pipe string element. The invention furthermore relates to a pipe string of a geological drill hole, in particular of a geothermal drill hole, a method for operating a geological drilling machine and a method for producing a pipe string for a geological drill hole.

1 . An apparatus for a pipe string of a geological drill hole, with a pipe string element and a fluid supply line which is arranged outside the pipe string element, extends along the pipe string element and is connected to a fluid injection device on the pipe string element, by means of which a fluid supplied through the fluid supply line can be introduced into an inner space of the pipe string element. 
     
     
         2 . The apparatus according to  claim 1 , wherein the fluid supply line is configured as a pipeline formed separately from the pipe string element, the walls of which pipeline are free from wall sections formed together with the walls of the pipe string element. 
     
     
         3 . The apparatus according to  claim 1 , wherein the fluid supply line is arranged at least in sections on the outside of the pipe string element. 
     
     
         4 . The apparatus according to  claim 1 , wherein the fluid supply line is configured as a high pressure line. 
     
     
         5 . The apparatus according to  claim 1 , wherein the fluid supply line is connected with at least one section through a connecting element which is arranged on the pipe string element and by means of which the pipe string element is connectable to a further pipe string element. 
     
     
         6 . The apparatus according to  claim 5 , wherein the fluid injection device is provided in the connecting element. 
     
     
         7 . The apparatus according to  claim 5 , wherein an inspection opening is formed on the connecting element. 
     
     
         8 . The apparatus according to  claim 1 , wherein the injection device is provided with a counterforce element which is configured to allow the injection of the supplied fluid into the inner space of the pipe string element only when a counterforce provided by the counterforce element is overcome. 
     
     
         9 . The apparatus according to  claim 8 , wherein the counterforce provided by the counterforce element is adjustable. 
     
     
         10 . The apparatus according to  claim 1 , wherein the pipe string element is connected to a further pipe string element via an associated connecting element, the fluid supply line also extending along the further pipe string element and being connected to a further fluid injection device on the further pipe string element, by means of which the fluid supplied through the fluid supply line can be introduced into an inner space of the further pipe string element. 
     
     
         11 . The apparatus according to  claim 10 , wherein the injection device and the further injection device are attached to separate supply line sections of the fluid supply line which are configured to feed the injection device and the further injection device individually. 
     
     
         12 . The apparatus according to  claim 10  wherein the further injection device is provided with a further counterforce element which is configured to allow the injection of the supplied fluid into the inner space of the further pipe string element only when a counterforce provided by the further counterforce element is overcome. 
     
     
         13 . The apparatus according to  claim 8  wherein the counterforce provided by the further counterforce element is different from the counterforce provided by the other counterforce elements. 
     
     
         14 . A pipe string of a geological drill hole, having an apparatus with a pipe string element and a fluid supply line which is arranged outside the pipe string element, extends along the pipe string element and is connected to a fluid injection device on the pipe string element, by means of which a fluid supplied through the fluid supply line can be introduced into an inner space of the pipe string element, wherein the apparatus is at least partially cemented in. 
     
     
         15 . A method for operating a geological drilling machine having an apparatus for a pipe string of a geological drill hole, with a pipe string element and a fluid supply line which is arranged outside the pipe string element, extends along the pipe string element and is connected to a fluid injection device on the pipe string element, by means of which a fluid supplied through the fluid supply line can be introduced into an inner space of the pipe string element, wherein the method comprises the following steps:
 supplying an operating liquid to an operative drill head mounted on a drill rod system,   conducting the operating liquid back away from the drill head through an inner space of a pipe string element,   supplying a fluid via a fluid supply line extending along and outside the pipe string element and   adding the supplied fluid from the fluid supply line via a fluid injection device formed on the pipe string element to the operating liquid conducted away in the inner space of the pipe string element.   
     
     
         16 . The method according to  claim 15 , in which a pipe string element is cemented, and during the cementing a pumping pressure is reduced by a fluid being supplied via a fluid supply line extending along and outside the pipe string element and added to a space to be cemented via a fluid injection device provided on the pipe string element.