TDS technique for horizontal multifractured wells in gas shale reservoirs
Abstract
With the development of new technologies, unconventional deposits have become economically viable, especially shale gas deposits, which have revolutionized the global energy sector. This type of deposits stores natural gas or crude oil, in fractures or in the matrix of the rock and it is necessary to use multi-fractured horizontal wells for their extraction. The current literature presents the TDS methodology to characterize this type of deposits without taking into account the capacity of adsorption and desorption that the matrix presents, therefore, in this investigation the pressure response and its derivative for a horizontal multi-fractured horizontal well obtained from an analytical simulator, which was based on a mathematical model proposed in 2012, which included the adsorption and desorption of the shale are analyzed. The pressure response of the simulator is governed by the following parameters: the dimensionless interporosity flow coefficient (λ), the dimensionless storativity ratio (ω), the adsorption and desorption coefficient (σ), the fracture length (xf ) and the number of fractures (M). Different pressure analyzes are made, varying different parameters, where points and characteristic lines are identified that allow obtaining equations for the calculation of λ, ω and xf . Finally, the TDS methodology (Tiab ́s Direct Synthesis Technique) is extended and verified with synthetic examples.
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