Systems and methods for a gas-driven compressor

A method of compressing a fluid using a process gas driven compressor, comprising:

• providing a high pressure port of a compressor body in communication with a first pressure;
• providing a low pressure port of the compressor body in communication with a second pressure;
• and
• moving a first piston with reciprocating movement within a first piston cavity, by moving a shuttle valve in response to a pressure differential between the high pressure port and the low pressure port, the movement of the shuttle valve selectively directing pressurized fluid from the high pressure port to opposite sides of the first piston within the first piston cavity, dependent on a position of a piston assembly that includes the first piston;
• the movement of the first piston moving a second piston of the piston assembly with reciprocating movement in a second piston cavity to compress a fluid within the second piston cavity.

A gas-driven compressor system, comprising:

• a high pressure port;
• a low pressure port;
• a piston assembly, including:
• a first piston movable within a first piston cavity in response to a pressure differential between the high pressure port and the lower pressure port;
• and
• a second piston moveable within a second piston cavity by movement of the first piston, to compress a fluid in the second piston cavity;
• and
• a shuttle valve movable between a first position and a second position in response to the pressure differential between the high pressure port and the low pressure port to cause reciprocating movement of the piston assembly by selectively directing pressurized fluid from the high pressure port to opposite sides of the first piston, dependent on a position of the piston assembly.