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Abstract
Due to the brittleness of the shale and tight reservoir and the development of natural fractures and horizontal beddings, complex fractures will be built by shear slip and tensile failure during multistaged horizontal well fracturing. Whether proppant can enter complex fractures and form effective support in main fractures and branch fractures determines conductivity of the complex fracture and stimulation effect of multistaged horizontal well fracturing. By means of discretization of disordered complex fractures, the orthogonal three-dimensional physical model of complex fractures is obtained and the complex fracture experimental device for simulating fracture complexity is developed and a complete set of proppant transport characteristic experimental device in unconventional reservoir complex fractures is formed. Combined with field parameters and lab experiments, the influence of proppant performance parameters and discharge capacity to proppant transport characteristics in complex fractures of the unconventional reservoir is studied. And on the basis of experimental results and analysis, the sensitivity analysis method is applied to analyze the influence degree of proppant transport characteristics in complex fractures of the shale or tight sandstone reservoir. The sensitivity order of influence factors is fracture morphology, proppant performance, liquid viscosity, displacement, and proppant concentration. The experimental device and research results can provide strong experimental support for the optimisation of shale or tight sandstone fracturing materials and field parameters.
Highlights
To access large shales or tight sandstone gas, multistage fracking is typically utilized, which is repeatedly used in each horizontal well as many as 20 times [1,2,3,4,5,6,7,8,9]
Whether proppant can enter complex fractures and form effective support in main fractures and branch fractures determines the conductivity of complex fractures and the stimulation effect of multistaged horizontal well fracturing [10]
As the experimental requirements are changing, the direction and width of fractures can be adjusted at different nodes, so as to obtain the complex fractures with different geometry and widths, which is helpful to complete the simulation experiment of proppant transport characteristics in complex fractures
Summary
To access large shales or tight sandstone gas, multistage fracking is typically utilized, which is repeatedly used in each horizontal well as many as 20 times [1,2,3,4,5,6,7,8,9]. An unconventional reservoir (shale or tight sandstone) is characterized by the brittleness, natural fractures, and horizontal bedding developed. Whether proppant can enter complex fractures and form effective support in main fractures and branch fractures determines the conductivity of complex fractures and the stimulation effect of multistaged horizontal well fracturing [10]. It is necessary to master the formation mechanism, morphological analysis, and characterization of complex fractures in the unconventional reservoir (shale or tight sandstone) and develop an experimental device that can effectively simulate complex fractures. Lab experimental research is carried out to quantitatively study the influence of displacement, proppant/fluid type, fracture morphology, and other factors on proppant transport in complex fractures, so as to provide strong. Technical support when optimizing proppant and field parameters for the unconventional reservoir (shale or tight sandstone)
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