![]() Predictive analysis of potential impacts on water resources are important for the risk analysis of resource development projects. Resource development from deep sedimentary basins often involves the risk of impacting groundwater resources. The geological basins in Australia across which the hydrogeological Great Artesian Basin (GAB) exists, hold significant coal and coal seam gas (CSG) resources. Hydrogeology Journal volume 28, pages 193–218 ( 2020) Cite this article Modelagem de escala regional e análise de predição de incerteza de impactos cumulativos às aguas subterrâneas derivados de atividades de extração de gás e mineração de carvão Modelización a escala regional y análisis predictivo de la incertidumbre de los impactos acumulativos de las aguas subterráneas en los desarrollos de la minería del carbón y del gas de veta de carbón Modélisation à l’échelle régionale et analyse prédictive d’incertitude des impacts cumulatifs sur les eaux souterraines des développements miniers de gaz de houille et de charbon Analysis of the bottom-hole pressure versus flow rate data obtained from the test yields results that, when plotted on log-log paper, produce a straight line that reflects the stabilized deliverability of the well.Regional-scale modelling and predictive uncertainty analysis of cumulative groundwater impacts from coal seam gas and coal mining developments At least one flow rate must then be maintained to stabilization in order to predict the current or future stabilized deliverability of the well. The isochronal and modified isochronal tests require that a well be produced at four different rates, each for a fixed period of time, separated by shut-in periods. The method, however, does not lend itself well to the testing of low permeability wells where the time to stabilization given by Eq. The conventional backpressure test requires that a gas well be flowed to stabilization at four different flow rates. The conventional backpressure test or flow-after-flow test, the isochronal test, and the modified isochronal tests are normally employed to predict the current and future deliverability of a gas well. Predicting the performance of a gas well is a process that has typically relied on using some form of multipoint well-testing procedure. In its simplest application, the new method allows an engineer to predict the AOF of a gas well which, when plotted on log-log paper along with the single stabilized point obtained from the pressure build-up or draw-down test, permits the construction of the stabilized deliverability curve and the determination of its equation. Using the new curves or their general equation, an IPR curve can be constructed. The curves may also be applied to unfractured wells by converting the apparent skin factor obtained from a pressure transient test to an equivalent ratio of external drainage radius to fracture half-length (xe/xf) using the apparent wellbore radius concept. The method utilizes new dimensionless IPR curves that were developed specifically for hydraulically fractured gas wells. This paper describes a method for predicting the deliverability of a gas well that requires only pressure build-up or draw-down test data. Their research focused on the development of dimensionless IPR curves for gas wells similar to Vogells curve for oil wells. Several researchers have worked to advance the theory of predicting gas well deliverability using a one-point test. All of these methods require testing a well at a minimum of four flow rates. Predicting the deliverability of a gas well is normally accomplished by conducting a four-point backpressure test, an isochronal test or a modified isochronal test.
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