Coiled tubing for insertion into coiled tubing

Abstract

A single tractor unit is provided for pulling a tractor, in which the tractor itself drives a plurality of hydraulic motors which control a crane unit, a coiled tubing injection unit, and the pumps and motors associated with a liquid nitrogen system which is used for injecting gaseous hydrogen into a workover well with coiled tubing. In an alternative mode, the liquid nitrogen system is replaced with one or more nitrogen generators which gather nitrogen from the earth's atmosphere to be pumped through the coiled tubing into the well being treated. Alternatively, the gaseous nitrogen source is one or more tanks of compressed nitrogen gas. Coiled tubing is described which embeds one or more stainless steel tubes for transporting gas, liquid or other fluids therethrough and also includes the use of one or more cords which are used to assist in maintaining the coiled tubing as having a circular cross-section, with such cords either being electrical or non-electrical in nature.

What is claimed is:  
     
         32 . A method for treating and/or measuring various parameters in formations surrounding an earth borehole, and/or in fluids located in such boreholes, comprising: 
 injecting a length of first coiled tubing from a first location at or above the earth's surface through the interior of a second length of coiled tubing to a second location in said borehole, wherein said first coiled tubing is substantially circular in cross-section, and has embedded therein, at least one tube for transporting fluids from said first location to said second location and/or for pumping fluid from said second location to said first location; and    pumping fluid from said first location to said second location    
     
     
         33 . The method according to  claim 32 , wherein said at least one tube comprises a first tube and a second tube.  
     
     
         34 . The method according to  claim 33 , wherein first and second chemicals are pumped through said first and second tubes, respectively, from said first location to said second location.  
     
     
         35 . The method according to  claim 34 , wherein said length of first coiled tubing also has at least one electrical line embedded therein running from said first location to said second location.  
     
     
         36 . The method according to  claim 35 , wherein said at least one electrical line comprises a first pair of electrical lines.