Changes – StimPlan/E-StimPlan 4.00/4.00A May, 2000
Incorporate 3-D numerical reservoir model including multi-layer effects (non-Darcy flow effects to be added soon).
Automatic parametric studies for economic treatment optimization. This utilizes the numerical fracture geometry in “Design Mode”, the 3-D reservoir model, and a new economics package to compare how varying fracture length, in situ lb/ft2, proppant type, pump rate, etc, effect the “value” of a treatment design.
New database structure for fluid/proppant data. StimPlan has always included “small” database files for storing and recalling fluid/proppant data. This has been expanded to a single (or multiple) unlimited database files for this data. At the same time, the database structure has been made more “visible” and easier to access and use.
Vastly expanded and improved “Help” system. This utilizes HTML code for a WWW type environment for the “Help”.
Improved graphical output including a “Net Pressure Plot” (combining a Nolte-Smith plot during injection with a ‘G’ Plot during the decline) and a “movie” type presentation for fracture growth.
Incorporate Finite Element calculations for fracture width. This allows a rigorous solution for the effects of layered modulus formations on overall and local fracture width – an industry first for a routine use fracture model.
Entirely new finite difference gridding method to improve stability.
Optional “Fine Mesh” for highly layered cases.
Analysis Module (Version 4.00A only)
A new “Analysis” feature has been aided specifically for Frac-Pack cases. In many cases involving downhole tools, valid bottomhole pressure data is available from annulus measurements. However, at shut-down a downhole check valve closes which isolates the annulus pressure from the pressure decline. The new feature “Merge Pressure Variables” allows a cut & paste operation to merge the annulus pressure (+ an appropriate hydrostatic head) during pumping with the tubing pressure data (+ an appropriate head) during the decline into a brand new pressure variable.
All analysis plots have been changed to permanently save/store the plot scales, “Zoom” settings, etc., along with the fitted lines, analysis information, etc.
Add capabilities for post-frac production analysis including Fetkovitch type curves, Carter type curves, and production history matching using the numerical reservoir model. Future StimPlan releases will include the Agarwal-Gardner type curves for more advanced production decline analysis.