Abstract: A method of inferring gas production utilizing a conduit having an outlet controlled by a valve in communication with a space within a well through which a gas volume is being produced. A selected number of measurements are taken during a selected period of time, with each measurement including closing the outlet valve to allow gas pressure within the conduit to change, sampling the gas pressure within the conduit over a sampling time period, calculating a rate of pressure change from samples taken over the sampling time period, and calculating a rate of gas production in the conduit from the calculated rate of change of pressure, the gas volume, well characteristics and gas properties. The calculated rates of gas production for the selected number of measurements are summed to determine an inferred rate of gas production through the conduit during the selected period of time.

Abstract: A method for inferring production of a rod pumped well. Inferred production is estimated in a well manager which not only performs pump-off control with a down-hole pump card, but also estimates liquid (oil-water) and gas production using the subsurface pump as a meter. Methods are incorporated in the well manager for identifying and quantifying several conditions: pump leakage, unanchored tubing, free gas and oil shrinkage. Quantifying such conditions in the well manger enables accurate inferring of production thereby eliminating the need for traditional well tests.

Abstract: Apparatus, methods and products for monitoring/controlling a reciprocating well producing hydrocarbons from a wellbore, which determine the surface card from a well operating characteristics, determine the downhole card, and display both at the same scale for position.