Inverted closed bellows with lubricated guide ring support

A pumping system deployed in a wellbore, the pumping system comprising:

• a motor, wherein the motor contains a motor lubricant fluid;
• a pump connected to a first end of the motor;
• and
• a volumetric compensator connected to a second end of the motor, wherein the volumetric compensator comprises:
• a head attached to the motor;
• a base comprising an exchange port;
• and
• a housing between the head and the base;
• an inverted bellows assembly contained within the housing, wherein the inverted bellows assembly comprises:
• a metal bellows that has an interior, an exterior, a proximal end and a distal end, and wherein the interior of the metal bellows is in fluid communication with the wellbore through the exchange port;
• and
• a standoff post within the metal bellows and connected to the base, wherein the standoff post comprises one or more vents, and wherein the exchange port extends through the base to the standoff post;
• and
• an annular space between the inverted bellows assembly and the housing, wherein the motor lubricant fluid extends into the annular space.

A volumetric compensator for use in a pumping system deployed in a wellbore, wherein the pumping system has an electric motor with motor lubricating fluid and a pump driven by the electric motor, the volumetric compensator comprising:

• a head, wherein the head includes an inlet port configured to place the volumetric compensator in fluid communication with the motor;
• a base, wherein the base includes an exchange port in fluid communication with the wellbore;
• a housing extending between the head and the base;
• and
• an inverted bellows assembly contained within the housing, wherein the inverted bellows assembly comprises:
• a metal bellows;
• an annular space between the metal bellows and the housing, wherein the annular space is filled with the motor lubricating fluid;
• and
• a plurality of guide rings connected to the exterior of the metal bellows, wherein each of the plurality of guide rings is configured to contact the housing of the volumetric compensator to prevent the metal bellows from directly contacting the housing.