Abstract
Because of the low permeability, multi-stage hydraulic fractured horizontal wells (MHFHWs) occupy a dominant position among production wells in tight gas reservoir. However, net present value (NPV) estimation method for MHFHW in tight gas reservoirs often ignores the effect of heterogeneity in microscopic pore structure. Apart from that, a new fractal model is presented for NPV of MHFHW, based on the fractal expressions of formation parameters. First, with the aid of apparent permeability model, a pseudo pressure expression considering both reservoir fractal features and slippage effect is derived, contributing to establish the productivity model. Secondly, economic assessment method is built based on the fractal productivity model, in order to obtain the NPV of MHFHW. Thirdly, the type curves are illustrated and the influences of different fractal parameters are discussed. The pore fractal dimensions [Formula: see text] and the capillary tortuosity fractal dimensions [Formula: see text] have significant effects on the NPV of an MHFHW. Finally, the proposed model in this paper provides a new methodology for analyzing and predicting the NPV of an MHFHW and may be conducive to a better understanding of the optimal design of MHFHW.
Highlights
Petit et al.[1] presented economic models to calculate the cost of oil production of steam injection with horizontal wells
Net present value (NPV) estimation method for multi-stage hydraulic fractured horizontal wells (MHFHWs) in tight gas reservoirs often ignores the effect of heterogeneity in microscopic pore structure
Apart from that, a new fractal model is presented for net present value (NPV) of MHFHW, based on the fractal expressions of formation parameters
Summary
Petit et al.[1] presented economic models to calculate the cost of oil production of steam injection with horizontal wells. A comprehensive method was represented by Cho[6] to analyze the parameters that have an effect on the productivity and overall economics This approach can be used to optimize the economic length of horizontal well. For the optimum design of horizontal well and hydraulic fracture, Bagherian et al.[11] analyzed various sensitivities of parameters of the horizontal well coupled with the assessment of economic As they put it, the optimization was critical and necessary to each specific reservoir, and uniform solution of all kinds of reservoirs was impossible. Mendoza et al.[12] described the procedure of how to execute a completion design of horizontal well and hydraulic fracture, the stages of fracture and assessment of economic included This workflow, available to obtain the key properties of reservoir, provided a quantitative approach to optimize the shale reservoirs. We will try to establish the model of NPV and optimize the horizontal well economic length of horizontal well, combining the economic evaluation method and formation model with fractal character
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