Developing a fuzzy logic-based risk assessment for groundwater contamination from well integrity failure during hydraulic fracturing

Recent natural gas development by means of hydraulic fracturing requires a detailed risk analysis to eliminate or mitigate damage to the natural environment. Such geo-energy related subsurface activities involve complex engineering processes and uncertain data, making comprehensive, quantitative risk assessments a challenge to develop. This...

Effect of condensate dropout on well productivity in propped fracture stimulated “unconventional” gas/condensate reservoirs

A large fraction of hydrocarbons is recovered from gas condensate reservoirs. A major production challenge from gas condensate reservoirs is condensate dropout, as condensate liquid saturation will build up due to drawdown below dewpoint level. Condensate Gas Ratio (CGR) decrease during production is a clear indication of condensate dropout,...

A Numerical Study on the Effect of Anisotropy on Hydraulic Fractures

In this paper, we present a two-dimensional numerical model for modelling of hydraulic fracturing in anisotropic media. The numerical model is based on extended finite element method. The saturated porous medium is modelled using Biot’s theory of poroelasticity. An enhanced local pressure model is used for modelling the pressure within the...

Pore pressure effects on fracture net pressure and hydraulic fracture containment: Insights from an empirical and simulation approach

Pore pressure and its relationship with fracture net pressure has been reported qualitatively from both field and experimental observations. From a modeling perspective, the ubiquitously used pseudo 3D (P3D) models that are based on linear elastic fracture mechanics (LEFM) do not include the effect of reservoir depletion (or overpressure)....

Characterization of Stimulation Potential in Jurassic and Carboniferous Shale plays of the Netherlands

This research focuses on the stimulation of shale gas plays of Jurassic Geverik member and Carboniferous Altena formations in the Dutch subsurface. The production of shale gas involves stimulation of the formation by hydraulic fracture treatment. Two typical types of stimulation are used in the industry. The viscous fluid treatment, which...