| Abstract: | In the Central Shaanxi-Gansu-Ningxia Basin Gas Field,well testing is used effectively for deliverability evaluation and prediction and it has played an important role in the design of gas development.This paper introduces the well testing methods used in the field, laying stress on the principles of the modifiedisochronous well testing method.Gas production equations of two forms-expon'ential and quadratic equationsare given.This paper also explains how to determine the equations of steady gas production,formation permeability and other properties.In the end,several methods for comprehensive deliverability evaluation are put forward,which are of general significance for the development of low permeability oil and gas fields. |
