During oilfield primary, secondary and tertiary recovery stages, different operations are conducted to improve oil and gas production efficiencies. MPFM can be used to evaluate the effectiveness and efficiency of various operations/workovers by measuring the post-operation production. During the primary recovery, such applications may include gas lifting and pump efficiency optimizations, as well as hydraulic fracturing and other well treatment operations. During secondary recovery, water injection/flooding and gas injection efficiencies can also be evaluated by the use of MPFM, especially when used continuously for an extended period of time. The same applies to tertiary recovery operations including chemical injection, CO2 and water injection. In shale gas and shale oil operations, fracturing flowback and choke management processes can also utilize Haimo's Sand Detector and MPFM to detect the presence of proppant and first show of oil, and to determine if flowback is complete.