Downhole vibratory apparatus

A vibratory downhole rotary apparatus, the apparatus comprising:

• a cylindrical hollow body having a first end and a second end;
• a stator disposed within the cylindrical hollow body;
• a rotor rotatably disposed within the stator, a portion of the rotor having an internal passageway in fluid communication with the second end of the cylindrical hollow body;
• and
• a fluid port in the rotor to permit fluid to flow from between the stator and rotor to the internal passageway of the rotor.

A vibratory downhole rotary apparatus having a fluid passage flow area, the apparatus comprising:

• a cylindrical hollow body having a first end and a second end;
• a stator disposed within the cylindrical hollow body;
• a rotor rotatably disposed within the stator;
• a rotatable fluid passage body attached to the rotor and disposed within the cylindrical hollow body, the rotatable fluid passage body having a fluid passage opening therein;
• a fluid flow restrictor positioned adjacent to the rotatable fluid passage body and disposed within the cylindrical hollow body, the fluid flow restrictor causing alternating increasing and decreasing flow resistance to fluid flowing through the apparatus;
• and
• wherein the fluid passage flow area of the apparatus is constant.