Abstract
Abstract Stimulated reservoir volume is an effective stimulation measure and creates a complex fracture network, but the description and characterization of fracture network are very difficult. Well test analysis is a common method to describe the fracture network, and it is the key to build a proper interpretation model. However, most published works only consider the shape of the fractured area or the stress sensitivity effect, and few works take both factors into account. In this paper, based on reservoir properties and flow law after a stimulated reservoir volume, an interpretation model is established with an arbitrary shape of the fractured area and stress sensitivity effect of different flow areas. The model is solved to conduct the pressure response using Laplace transform, point source function, and boundary element theory. The influence of fractures’ parameters and stress sensitivity effect is analyzed on the pressure behavior. Results from this study show that the special flow regimes for a horizontal well with a stimulated reservoir volume are (1) bilinear flow dominated by hydraulic fractures, (2) linear flow dominated by formation around the hydraulic fractures, (3) crossflow from a matrix system to the fractured area, and (4) radial flow control by properties of the fractured area. Parameters of hydraulic fractures mainly affect the early stage of pressure behavior. On the contrary, the stress-sensitive effect mainly affects the middle and late stages; the stronger the stress sensitivity effect is, the more obvious the effect is. The findings of this study can help for better understanding of the fracture network in a tight oil reservoir with a stimulated reservoir volume.
Highlights
During the development of tight reservoirs, the stimulated reservoir volume has been widely used, which greatly increases the production of oil and gas wells [1,2,3,4]
Well testing is the effective means to evaluate the properties of the reservoir and the stimulation effect, which is widely used to characterize the fracture network in tight oil reservoirs with the stimulated reservoir volume [5,6,7,8]
The stimulated reservoir volume is mainly to form a complex network of fractures around the wellbore, which greatly improves the permeability of the fractured area and reduces the flow resistance of the fluid to increase well production
Summary
During the development of tight reservoirs, the stimulated reservoir volume has been widely used, which greatly increases the production of oil and gas wells [1,2,3,4]. Lacy et al tests the curve of the fracture width with stress in a soft sandstone reservoir by computer-controlled simulation experiment technology and shows that the fracture width first decreases rapidly and tends to be stable during the increase of effective stress, and the fracture width can be reduced by more than 60% [23]. These above studies verified that there are stress sensitivity effects in hydraulic fractures, the fractured area, and the matrix reservoir in the development of tight reservoirs with volumetric fractured horizontal wells. The results have a certain guiding role for the fracturing design and fracturing effect evaluation
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