Down hole pump and testing apparatus

A downhole pump assembly, comprising:

• a top adapter means for threadedly attaching said pump assembly to an upper portion of a pipe string;
• a ratchet mandrel, connected to an inner cylindrical surface of a lower end of said top adapter means;
• a cylindrical torque adapter connected to an outer cylindrical surface of said lower end of said top adapter means;
• a cylindrical torque housing, having an upper end connected to a lower end of said torque adapter and including a radially inward projecting annular flange at a lower end thereof;
• a torque mandrel, having an upper end extending into a lower end of said torque adapter and including a downward facing annular shoulder with a plurality of splines extending radially outward adjacent said shoulder, said shoulder engaging in an upper surface of said flange of said torque housing, and said splines engaging a plurality of radially inward projecting splines of said torque housing to prevent relative rotational motion between said torque mandrel and said torque housing;
• a ratchet case, including a cylindrical upper end located in an annular space between said ratchet mandrel and said torque mandrel, and including a cylindrical bore within which a lower end of said ratchet mandrel is slidingly received;
• a plurality of ratchet blocks, attached to an upper end of said ratchet case, said ratchet blocks including radially inner threads engaging a threaded outer surface of said ratchet mandrel and including radially outer surfaces closely engaging an upper inner cylindrical surface of said torque mandrel;
• a release mandrel, having an upper end connected to a lower end of said ratchet case;
• a pump housing assembly, within which a lower end of said torque mandrel is rotatingly received, said pump housing assembly including:
• a cylindrical pump housing, including a lower pump housing adapter means for threadedly attaching said pump housing to a lower portion of said pipe string;
• a cam driven reciprocating piston pump disposed in said cylindrical pump housing, said pump being connected to said lower end of said torque mandrel so that said pump is driven when said torque mandrel is rotated relative to said pump housing;
• intake passage means, connecting a suction of said pump with a lower end of said lower pump housing adapter for communication with a suction inlet means of said lower portion of said drill string;
• discharge passage means, connecting a discharge of said pump with said lower end of said lower pump housing adapter;
• and
• an inner cylindrical bore disposed in said pump housing assembly, and a relief port communicating said bore with said discharge means;
• and wherein
• a lower end of said release mandrel is closely received within said inner cylindrical bore of said pump housing assembly, and is longitudinally movable relative to said inner bore, between a first position, wherein said relief port is open to communicate said discharge passage with an inner bore of said release mandrel and a second position wherein said relief port is closed.