SPE Eastern Regional Meeting,
17–19 August 2011,
Columbus, Ohio, USA
Immense potential of shale gas to supplement domestic energy needs and the
recent engineering strides in multi-staged fractures in long horizontal well
laterals have inevitably increased interest in exploitation of such plays
across the country. However, because of the continuous nature of these plays,
the production potential can change significantly from one location to the
other often within close proximity. For a project to be economically viable,
under downward price pressures, large number of wells in multi-well drilling
campaigns needs to produce commercial quantities of gas. Not surprisingly,
numerous attempts are being made to type-cast mineralogy, organic contents,
fracture design and completion optimization in order to reduce exploration and
exploitation risks. Many uncertainties still remain, however. The proposed
model (SGPM) is developed to mitigate some of these challenges. It is simple
and easy-to use and unlike grid-based fine-grid models it focuses more on the
flow around individual wells while conserving overall mass. First, the current
status of modeling from fine grid dual-porosity/dual permeability simulations
to analytical models for horizontal wells with multiple vertical fractures is
explained. The assumptions, formulation and the need for SGPM are described
next. The model is validated with vertical and horizontal well productions from
various shale gas plays. Results of extensions to the model to account for
multi-phase flow are displayed thereafter.
This paper contributes in the following manner:
1. Provides an alternate framework to history match and forecast shale
gas production. This model is better suited for reservoir engineers’ routine
reserves estimation work because of its quicker turnaround time.
2. Provides a relatively simpler framework to incorporate specialized
asset specific physics and geomechanics.
3. Multi-phase flow feature enables accurate condensate production in
plays like Marcellus and Eagle Ford.