METHOD FOR SELECTING DECLINE CURVE METHOD IN ACCORDANCE WITH CUMULATIVE PRODUCTION INCREASE RATE INDEX IN UNCONVENTIONAL GAS FIELD

摘要

The present invention relates to a method having presented an index for selecting a decline curve method in ultimate recovery and cumulative production prediction in an unconventional gas field and, more specifically, to a method capable of selecting a decline curve method by using a cumulative production increase rate index in an unconventional gas field such that the decline curve method can be used by using the index during productivity evaluation and productivity prediction for economic analysis in the development of the unconventional gas field. According to the present invention, the method for selecting a decline curve method in accordance with a cumulative production increase rate index in an unconventional gas field comprises: a data collection step of acquiring data through daily output production data from actual field data; a step of calculating a cumulative production increase rate index by using the data acquired in the data collection step; a step of selecting a decline curve method by means of a value calculated from the cumulative production increase rate index; and predicting the cumulative production and ultimate recovery of an unconventional gas field by using the selected decline curve method.