Method for joining ends of sections of pipe

A method for joining together adjacent ends of substantially equal sized inside and outside diameter first and second sections of pipe prior to installing into an oil well, comprising:

• forming a pipe joint between adjacent ends of successive pipe sections of equal inside and outside diameters prior to advancing into said oil well comprising:
• forming a taper generally increased diameter shape on the inside of one end of a first pipe section to form a female end thereon having an increasing diameter in a direction towards an end of said female end while maintaining an outside diameter of said female end to be the same as remaining portions of said first pipe section;
• forming a complementary taper on the outside of the one end of a next adjacent successive second pipe section to form a male end thereon increasing in diameter in a direction away from said male pipe end and having larger diameters than the diameter of the taper on the inside of said female pipe end, while maintaining the inside diameter of said male pipe end and remaining portions of said second pipe section substantially constant;
• heating the female pipe end to increase its taper inside diameter sufficiently to allow said female pipe end to be received over the taper of the male pipe end, and advancing said heated female pipe end over said male pipe end;
• and thereafter cooling said female pipe end to contact said taper of said female pipe end so as to grip said taper of said male pipe end tightly, whereby a pipe joint is formed having substantially the same inside and outside diameter as said remaining portions of said pipe sections;
• repeating these steps for each successive pipe section introduced into said well;
• and,
• thereafter expanding at least some of said successive joined pipe sections in said well by plastic deformation induced by hydraulic pressure.