Modeling Interwell Interference Due to Complex Fracture Hits in Eagle Ford Using EDFM

Abstract

Shale field operators have vested interest in optimal spacing of infill wells and further fracture optimization, which ideally should have as little interference with the existing wells as possible. Although proper modeling has been employed to show the existence of well interference, few models have forecasted the impact of multiple inter-well fractures on child wells production to optimize further hydraulic fracture designs. This study presented a rigorous workflow for estimating the impacts of spatial variations in fracture conductivity and complexity on fracture geometries of inter-well interference. Furthermore, we applied a non-intrusive embedded discrete fracture model (EDFM) method in conjunction with a commercial black oil reservoir simulator to investigate the impact of well interference through connecting fractures by multi-well history matching, based on a robust understanding of fracture properties, real production data and wellbore image logging. First, according to updated production data from Eagle Ford, the model was constructed to perform four (parent) wells history matching including five inner (child) wells. Later, fracture diagnostic results from well image logging were employed to perform sensitivity analysis on properties of long interwell connecting fractures such as number, conductivity, geometry, and explore their impacts on history matching. Finally, optimal cluster spacing was recommended considering interwell interference. The simulation results show that well interference is present and reduces effectiveness of the fracture hits when the connecting fracture conductivity, primary fracture conductivity, and number of connecting fractures increase. Because of these interwell long fractures, the bottomhole pressure behavior of the parent wells tends to equalize. Furthermore, the EDFM application is strongly supported by complex fracture propagation interpretation from image logs through the child wells in the reservoir. Through this study, three possible scenarios are shown with robust history matching of the model considering more than 20 complex dominant long interwell fracture hits and more than 2000 hydraulic fractures. The model became a valuable stencil to decide the well location and spacing, the completion staging, and to optimize the hydraulic fracture treatment design as well as its sequence so that it can be expanded to other areas of the field. The simulation results were applied to the field successfully to afford significant reductions in offset frac interference by up to 50% and reduce completion costs up to 23% while improving new well capital efficiency.

Stress evolution and fracture propagation of infill well after production and injection of parent well in a tight oil reservoir

“…Gupta et al analyzed the production data of MFHWs in the Haynesville shale to predict cumulative production and diagnose the impacted wells by fracture hits, refracturing and other factors (Gupta et al 2020b). Fiallos et al investigate the well interference in the Eagle Ford shale reservoir using numerical models in the combination of an embedded discrete fracture model (Fiallos et al 2019). Yang et al developed a two-fracture model to simulate the bottom-hole pressure (BHP) response of the two-well system with frac hits among simple fractures during shut-in period (Yang et al 2020).…”

Automatic History Matching of Parent-Child Wells in Shale Gas Reservoirs with Complex Fracture Hits

“…With the tremendous infill wells drilling in recent years, well interference or fracture hits became the top issue for unconventional reservoir development [2][3][4][5][6][7][8][9][10]. Specifically, the interference mechanism is a complicated issue in terms of matrix permeability and complex fracture network [2].…”

“…With the tremendous infill wells drilling in recent years, well interference or fracture hits became the top issue for unconventional reservoir development [2][3][4][5][6][7][8][9][10]. Specifically, the interference mechanism is a complicated issue in terms of matrix permeability and complex fracture network [2]. Some potential mechanisms of shale gas well interwell interference through matrix permeability, hydraulic fracture well-to-well interference, and interference by complex natural fracture networks are thoroughly presented by Yu et al [8].…”

“…Luckily, the embedded discrete fracture model (EDFM) is able to handle the aforementioned problems appropriately. Fiallos et al [2] and Yu et al [10] employed EDFM to model the complex fracture networks and studied the impact of well interference on multiwell performance in unconventional oil reservoir. However, there is limited research that the simulation results of well interference are validated with deep shale gas wells through history matching with field production data.…”

Three-Dimensional Numerical Simulation of Multiscale Fractures and Multiphase Flow in Heterogeneous Unconventional Reservoirs with Coupled Fractal Characteristics

“…Based on the EDFM, Zhang et al [15] established a 3D model of multistage hydraulic fracturing of horizontal wells in tight reservoirs, accounting for the influence of gravity and stress sensitivity. Fiallos et al [16] used the EDFM to study the impact of inter-well interference on productivity. Zhu et al [17] designed an EDFM based on corner grid and refined the near-well zone grid.…”