Based on these, the new method that pressure build-up curve associated with pressure fall-off curve to determining the productivity of gas well is proposed.

Therefore, instead of focusing on making money by innovating around fuel efficiency, productivity and design, G.M. threw way too much energy into lobbying and maneuvering to protect its gas guzzlers.

Oil, natural gas, coal, and many of the sources of electricity are nonrenewable-as they are used, they are also used up, raising prices and limiting further increases in productivity.