ABSTRACT
The typical production curve is an important factor in the prediction of unconventional natural gas production. In this paper, the prediction method of single-well productivity prediction of unconventional natural gas in the Montney basin in western Canada was to determine the typical production curve of single well fractures in gas wells and then multiply by single well fracturing, so the total output of a single well within the economic limits was predicted. Based on the analysis of a large number of production data in unconventional gas fields in the Montney basin, the typical production curves of the tight sandstone gas reservoirs are generally characterized by three sections, the shale gas has two characteristics of production, and the coalbed gas reservoirs have a production characteristic. The prediction accuracy of typical production curves depend on the calculation parameters of the curve decreasing, the quality of the production data, and the production cycle. The cumulative yield of unconventional natural gas reservoirs within the economic limits depends largely on the lithology and physical properties of the reservoir. The same kind of lithological reservoir, the better the physical properties, the higher the cumulative yield. The statistical results show the physical properties is the key factor of sweet point of unconventional natural gas reservoir.
