Method to determine frictional pressure losses from fluid flow through wells, pipes, and perforations from analysis of water hammer

A non-transitory computer readable medium having stored thereon a computer program, the computer program having logic operable to cause a programmable computer to perform acts, comprising:

• accepting as input to the computer measurements of a pressure in a pipe of fluid moving at a first rate through the pipe;
• after changing the rate of moving fluid to a second rate, the rate changed so as to induce tube waves in the pipe, accepting as input to the computer measurements of pressure of the fluid flowing at the second rate;
• in the computer, using the measured pressures at the first rate and at the second rate, determining frictional fluid pressure loss in the pipe, wherein the determining fluid pressure loss in the pipe comprises determining a pipe friction factor based on pressure change with respect to time after the changing flow rate and prior to a reflected tube wave reaching a position of the measuring pressure.