The invention discloses a
tight gas well unstable open-flow capacity evaluation method based on production
dynamic data, and belongs to the technical field of gas
reservoir engineering. The method comprises the following steps: firstly, collecting
tight gas well production
dynamic data and basic parameters and preprocessing; then, a
deconvolution algorithm and a Duhamel principle are introduced, and variable-yield variable-
pressure data are standardized into constant-pressure variable-yield data; then, in combination with a gas reservoir seepage
differential equation considering
natural gas compressibility, a'bottom hole flowing pressure-yield-time 'relation model is established; a yield-
time function is reversely deduced, the bottom hole flowing pressure is made to be 0, and the unstable open-flow capacity is calculated; and finally, drawing a change curve, analyzing a dynamic rule and a decline mechanism, and providing reference for development countermeasures. The method realizes efficient utilization of production
dynamic data, accurately captures an open-flow capacity decline rule, improves evaluation precision and timeliness, reduces cost, is suitable for unconventional gas reservoirs such as
tight gas reservoirs, and provides support for efficient development of the gas reservoirs.