Oil well simulation tool

A method, comprising:

• activating a lift mechanism of a well tank assembly in an oil well simulation tool, thereby transferring working fluid from the well tank assembly to a separator tank of the tool;
• closing a return pipe coupled between the separator tank and a reservoir tank, thereby transferring the working fluid from the separator tank to the reservoir tank;
• determining a first amount of volume of the working fluid in the separator tank after the return pipe is closed;
• determining a second amount of volume of the working fluid in the separator tank after a predetermined amount of time;
• and
• determining a flow rate of the working fluid in the oil well simulation tool based on the first amount of volume, the second amount of volume, and the predetermined amount of time.

An oil well simulation tool, comprising:

• a reservoir tank configured to contain a working fluid, wherein the working fluid represents a reservoir fluid in a subterranean reservoir;
• a constant pressure device that includes an inner tubing and an outer tubing that is positioned concentrically around the inner tubing, wherein the constant pressure device is configured to:
• receive the working fluid from the reservoir tank, and
• maintain a substantially constant pressure within the device;
• a well tank assembly configured to receive the working fluid from a pipe coupled to the constant pressure device;
• and
• a separator tank configured to receive the working fluid from the well tank assembly and configured to store the working fluid.