Directly connected drill pipe applicable to extreme conditions

A directly connected drill pipe, comprising:

• a tool joint pin having:
• a main shoulder disposed on an outer annular projection;
• an auxiliary shoulder disposed on an inner annular projection;
• a main auxiliary shoulder disposed within an annular groove, wherein the annular groove is disposed between the outer annular projection and the inner annular projection;
• threads disposed on the inner annular projection extending between the main auxiliary shoulder and the auxiliary shoulder;
• a tool joint box having:
• a main shoulder disposed within an outer annular groove;
• an auxiliary shoulder disposed within an inner annular groove;
• a main auxiliary shoulder disposed on an annular projection;
• threads disposed on the inner annular groove extending between the auxiliary shoulder and the main auxiliary shoulder;
• wherein a connection between the tool joint pin and the tool joint box comprises:
• a main shoulder connection between the main shoulder of the tool joint pin and the tool joint box;
• an auxiliary shoulder seal between the auxiliary shoulder of the tool joint pin and the tool joint box;
• a main auxiliary shoulder seal between the main auxiliary shoulder of the tool joint pin and the tool joint box;
• wherein the main shoulder of the tool joint pin extends outward from the main auxiliary shoulder in at least partial covering relation to the threads extending between the main auxiliary shoulder and the main shoulder;
• wherein the directly connected drill pipe further comprising:
• threads disposed on the main shoulder of the tool joint pin and the main shoulder of the tool joint box for providing the main shoulder connection, wherein the threads are mated together when the tool joint pin and the tool joint box are connected.

A method of connecting drill pipe, comprising:

• providing a tool joint pin having a main shoulder disposed on an outer annular projection, an auxiliary shoulder disposed on an inner annular projection, a main auxiliary shoulder disposed within an annular groove disposed between the outer annular projection and the inner outer projection, threads extending between the auxiliary shoulder and the main auxiliary shoulder on the inner annular projection of the tool joint pin, and a tool joint box having a main shoulder disposed within an outer annular groove, an auxiliary shoulder disposed within an inner annular groove, a main auxiliary shoulder disposed on an annular projection disposed between the inner annular groove and the outer annular groove, and threads extending between the main auxiliary shoulder and the auxiliary shoulder on the inner annular groove of the tool joint box;
• connecting the tool joint pin and the tool joint box by:
• mating a main shoulder connection between the main shoulder of the tool joint pin and the tool joint box;
• mating a main auxiliary shoulder seal between the main auxiliary shoulder of the tool joint pin and the tool joint box;
• and
• mating an auxiliary shoulder seal between the auxiliary shoulder of the tool joint pin and the tool joint box;
• mating a threaded connection between the threads of the inner annular projection of the tool joint pin and the threads of the inner annular groove of the tool joint box, wherein the threaded connection extends between and terminates at the main auxiliary shoulder and the auxiliary shoulder of the tool joint pin and tool joint box;
• the method further comprising:
• providing threads disposed on the main shoulder of the outer annular projection of the tool joint pin and threads disposed on the main shoulder of the outer annular groove of the tool joint box;
• mating the threads together disposed on the main shoulder of the tool joint pin and tool joint box when making the main shoulder connection.