Two parallel objectives, reservoir characterization and reserves validation are sought with this work. Reservoir characterization for multi-fractured horizontal wells leads to economic optimization of fracture spacing along a horizontal wellbore and the lateral spacing of horizontal wellbores. Accurate reserve determinations are important for forecasting revenue and when buying and selling reserves.
The Eagle Ford shale supplies a rich data set with reservoir fluid phase continuity from oil to condensate to dry gas. Contours of reduced temperature (absolute reservoir temperature divided by critical temperature) are shown in Figure 1. Reservoir temperature was based on recorded temperatures from logs. Determination of critical temperature is discussed later in the paper. Note that the scale in the key, while properly depicting gas with reduced temperatures greater than one, does not intend to portray that gas wells are north of oil wells.
Motivation for this study was based on developing an understanding of recovery factors for producing wells transecting the phase envelope from oil into condensate fluids and for recovery factors, in general, for liquids rich shale reservoirs.
Monthly production, completion reports (G-1 and W-2) and well logs are used to perform production data analysis and to determine perforation cluster and stage spacing for the hydraulic fracture stimulation treatments.